BBB.REV

DIRECT DIGITAL CONTROL SYSTEM

NOTE: MASTER COPING DATE: -----, 1983

Part 1 -	GENERAL

1)	RELATED DOCUMENTS

A.	The General Provisions of the Contract, including General Conditions and/or General Requirements of the specifications apply to the work specified in this Section

NOTE: REFERENCE ALL RELATED SPECIFICATIONS AND CONTRACT DOCUMENTS

B.	Related work described in other sections:

1.	General Provisions for Direct Digital Control System.

2.	Electrical Provisions for Direct Digital Control System.

3.	Bidding Information for Direct Digital Control System.

4.	Mechanical General.

5.	Vibration Isolation.

2)	DESCRIPTION OF WORK

A.	Provide Direct Digital Control Instrumentation Subsystem as a distributed processing network described below. The HOST Computer shall support communications to the Direct Digital Control Panels (DDCPs), and provide operator interaction, data consolidation and global control functions.

B.	The system shall provide operator interaction and dynamic process manipulation, including overall system supervision, coordination, and control. Sensed data shall be obtained from Direct Digital Control panels. Every connected analog output (AO), analog input (AI), digital output (DO) and digital input (DI) is a real point

C.	The term virtual point refers to all mathematical combinations of real points. Both real and virtual points represent a "point" where refered to in this specification. All points shall be read and controlled from the DDC panels

D.	The system shall consist of HOST, DDCPs, operator consoles, instrumentation and all interfaces. Operator consoles shall consist of HOST Graphic Display(s), printer(s) and other equipment as specified herein and indicated on the drawings. These basic system elements shall be interconnecte by a communications network and built up of standard components. The components shall not require customizing other than setting jumpers and switches, adding firmware modules or software programming to perform required functions. The system design shall be based on state-of-the-art electronic components which are produced in quantity and are readily available form more than one source

E.	DDCPs shall be microprocessor based, and capable of performing direct digital control of sub-systems in either a standalone mode or while connected t network

F.	System components completely modular, physically and electronically from system configuration standpoint

G.	Direct Digital Control System to monitor and control mechanical, and electrical, equipment as noted, work to include, but not limited to

1.	HOST with peripherals as noted.

2.	Magnetic data storage unit.

3.	Direct Digital Control Panels.

4.	Maintenance operator terminals.

5.	Compressed air piping.

6.	Compressed air equipment.

7.	Instrumentation.

8.	Local control cabinets if required.

9.	Automatic dampers.

10.	Smoke dampers.

11.	Automatic valves.

12.	Sensors, monitor and control equipment, wiring, piping, and conduit connecting devices to remote panels unless noted

13.	Multiplexed data transmission system.

14.	Interlock and control wiring.

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT

15.	Power wiring for complete control system except as noted.

16.	Software for a complete system; peripheral selection, energy management, data management; functions, sequences, programs

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

3)	<WORK BY OTHERS

NOTE: VERIFY WORK BY OTHERS IN APPLICABLE SPECIFICATIONS SECTIONS

A.	HVAC Contractor shall install control valves, pressure and temperature sensing taps and wells in piping; and control and smoke dampers, in ductwork. Equipment supplied by this contractor unless noted otherwise

B.	Electrical contractors shall install AC power connections to air compressors

C.	Smoke detectors installed by fire alarm contractor.

4)	SYSTEM LISTING COMPLIANCE

A.	Meet FCC requirements for class A computer devices.

B.	UL listed as a UL-916 Energy Management System.

C.	All electrical components UL listed for shock safety as applicable.

5)	EXPANSION CAPABILITY AND FUTURE REQUIREMENTS

NOTE: INSERT CAPACITY IN MULTIPLES OF 1500

A.	Data trunk cable (DTC) capable of handling 1500 remote functions (points)

B.	Central hardware capable of handling 1500 remote functions (points) with no hardware changes except in DDCP

C.	System modular, to allow change of function and operation in field by plug-in module equipment and software change to expand system capacity on full on-line basis

6)	SUBMITTALS

A.	General.

1.	Within 30 days of award of contract submit time schedule of submittals for approval

B.	Shop drawings.

1.	Shop drawings submission shall include software and hardware items subject to interpretation. Submissions in form of drawings, brochures, bulletins, catalogue data, narrative descriptions. Specifically include

a.	Process and instrumentaion flow diagrams for all systems controlled.

b.	System architecture diagram showing quantity and location of all HOST processors, control console equipment, I/O devices, DDCPs, Local Control Panels and Major System Components

c.	Schematic diagrams of all subsystems.

d.	Interfaces (software and hardware) with equipment provided in other sections of specifications

e.	Narrative description of operation for each system.

f.	Description of manual override capabilities.

g.	Software flow diagrams. Identify points used in each program.

h.	Complete input output point schedule. Identify point function, type and location

i.	Interlock schedule. List equipment interlocked (software or hardwired)

j.	Alarm annunciation and sequences.

k.	Spare capacity provisions.

l.	Detailed bill of materials.

m.	Technical bulletins and catalogue data for all equipment, system components. Clearly identify, by use of symbol or tag number, the service of each item

n.	Valve and damper schedule: provide identification numbers, location, system, dimensions and performance data. Include damper leakage rates

o.	Instrument mounting details. Include as minimum:

(1)	Sensing elements in ducts or casings.

(2)	Sensing elements in piping.

(3)	Variable volume inlet vane damper operator.

p.	Ladder wiring diagrams.

q.	Panel appearance detail with nameplate legend.

2.	Complete full size drawings, 11 in. x 17 in. minimum.

C.	Software documentation.

1.	Submit for approval.

a.	Point identification code.

b.	System advisory messages, printouts, logging formats.

c.	Drawings of system graphics showing monitored points.

d.	Application programs: include specific programming for each system, calculation of parameters, method of field tuning, and integration into DDC control sequences

e.	Person machine interface program. Include commands, alarm annunciation, logs and programming capabilities

f.	Description of system operation under failure conditions.

g.	Description of operating systems, location and type of processors and memory (RAM and ROM)

D.	Owner's manuals.

1.	General.

a.	Submit 4 draft copies of owners manuals for review. After review by authorized representative contractor shall incorporate review comments and submit 10 final copies

b.	During guarantee period contractor shall update manuals with modifications made to system. Provide replacement pages or supplements in quantity stated above

c.	Each manual: Vinyl plastic cover binders with silk screen printing; assemble material in multi-volume sets

(1)	Binder to be heavy duty, oversized to accommodate up to 1/2 in. thick set of additional information.

(2)	Plastic printed tabs on major sections.

(3)	Apron foldouts for oversize pages.

(4)	Identified with project name, manual title and owners name on front cover and binder

(5)	First page of each manual identified with date, project name, manual title, owners name, engineers name, contractors name, address and service phon numer, and person who prepared manual

2.	Operating manual.

a.	Purpose: to serve as training and reference manual for all aspects of day-to-day operation of the system

b.	Include.

(1)	As built shop drawings as described in "shop drawings" for all systems included in specifications and drawings

(2)	Principles of operation and detailed narrative sequences.

(3)	Description of manual override opration of control points.

(4)	Step by step instructions for operating systems in different control modes (warm up, cooldown, occupied, summer, winter)

(5)	Complete equipment and system operations control narratives including sequence of operation for normal and abnormal operating modes. The control narratives for each mechanical system component shall describe in detail the as built drawings specified above, using the proper instrumentation tag number cross-referencing and defining the exact level of pneumatic/electronic signals controlling various final control elements

3.	Maintenance manual.

a.	Purpose: To serve as training and reference manual for all aspects of day-to-day maintenance and major system repairs

b.	Include:

(1)	Systems layout and interconnection schematic diagrams. Layouts shown on coordinated mechanical/electrical drawings

(2)	Table of multi-conductor cable tag numbers and corresponding system and building, floor and area served

(3)	Overall system shielding and grounding scheme indicating all major components and ground paths

(4)	Photographs and drawings showing physical details with callouts and markings which identify and locate equipment

(5)	Charts showing normal operating conditions at significant points such as electrical test points

(6)	Routine preventive maintenance procedures and corrective diagnostic trouble shooting procedures

(7)	Parts lists with manufacturer's catalog numbers and ordering information.

(8)	Lists or ordinary and special tools, operating materials supplies and test equipment recommended for operation and servicing

(9)	Detailed description of modifications made to standard catalog equipment.

(10)	Detailed description of changes resulting from contractor field effort.

(11)	Manufacturer's set up, maintenance and catalog literature for each piece of equipment

(12)	Logic diagrams. Analog functional diagrams as well as digital logic diagrams shall be provided, where applicable, in accordance with ISA/SAMA standards

(13)	Piping and instrumentation diagrams (P&ID's) covering all the mechanical equipment and systems (including any interfaces with existing equipment and systems) defined by this project. These drawings shall be complete with control and instrument loop, analog and digital interlock, with proper tag numbers for each instrument

(14)	Interlock ladder diagrams for each system showing microprocessor I/O interface with field or panel mounted instrumentation and/or equipment

(15)	I/O lists describing the function, location, and address of each I/O (analog or digital)

(16)	Control panel arrangement drawings to inlcude front and rear views as well as any graphic panel sections

(17)	Instrument rack/stand arrangement drawings.

(18)	Instrument conduit and control wiring layouts.

(19)	Equipment brochure and service manual for all subsystems and equipment provided under this section to include

(a)	Equipment and components, descriptive literature.

(b)	Performance data, model number.

(c)	Installation instructions.

(d)	Operating instructions.

(e)	Maintenance and repair instructions.

(f)	Recommended spare parts.

(g)	Lubrication instruction.

4.	Programming manual.

a.	Purpose: to serve as training and reference manual for all aspects of system programming.

b.	Include:

(1)	Complete programming manuals and reference including instructions, complete programs listings and flow charting for functions noted. Provide bot in hard copy printout form and magnetic media (floppy disk) form

(2)	Supply five copies of complete programming manuals, references to include, in addition to manual supplied by computer manufacturer, complete instructions and sample programming for functions described in specificatons. Complete information provided on addressing and indexing of control and input-output points

(3)	Provide details of any special software packages and compilers supplied with system

(4)	Document and supply any other information required for independent programming of system at completion of programming supplied under this contract

(5)	Documentation on application programs. Flow charts, equations, parameters

(6)	Documentation on each DDC program. Flow charts, calculations, parameters

(7)	Point schedule. Include all points, real and virtual.

(8)	Software diagnosis flow charts.

7)	OPERATOR TRAINING PROGRAM

NOTE: LENGTH OF TRAINING BASED ON SIZE AND COMPLEXITY OF PROJECT.

A.	Train not less than 5 operators for console, with personal on job instruction provided by competent engineer representating Contractor

B.	Provide each operator with complete, printed operating instructions and brief sub-system description in manual or handbook form

C.	Contractor shall provide training session, with minimum training time of one week. Sessions scheduled to suit requirements, may be scheduled at any time from award of contract to end of guarantee period at authorized representative's request.

D.	Training to include but not be limited to:

1.	Access and control of system points (enable, disable, command, reset etc.

2.	Read, add, delete, modify and downline load system point data base and control programs

3.	System trouble shooting and diagnostic procedures.

4.	Report, log and data sort functions (point loss, alarm logs, trend logs, etc.

5.	Energy Management Programs.

6.	Preventive maintenance of console printers and other equipment, inclusive of replacing paper, tapes and bulbs

E.	Submit course outline and operating manual for approval prior to scheduling training

F.	Certification of successful completion of training: If in Contractor's judgment, personnel assigned should not be certified, notify Owner

G.	Travel and living expenses for personnel by authorized representative.

8)	MAINTENANCE TRAINING PROGRAM

A.	Train not less than 5 personnel in proper operation and maintenance of parts of system, with personal on job instruction provided by competent enginee representing Contractor. Contractor shall provide training session with minimum training time of one week. Sessions scheduled to suit authorized representative's requirements and may be scheduled at any time from award of contract to end of guarantee period at authorized representative's request

B.	Provide 5 complete sets of written maintenance instructions, as built drawings, specifications data sheets and maintenance schedules

C.	Certification of successful completion of training: If in Contractor's judgement, personnel assigned should not be certified, notify Owner

D.	Submit course outline and maintenance instructions for approval prior to scheduling training

E.	Travel and living expenses for personnel by Authorized representative.

Part 2 -	PRODUCTS

1)	CENTRAL PROCESSING AND DATA COLLECTION HARDWARE

A.	Central processor (HOST).

1.	Provide HOST computer complete with 640K of RAM, 1 double sided double density floppy disk drive, and a 30 megabyte hard disk drive

2.	Unit shall come complete with required optional cards, including real time and date clock, parallel and serial I/O ports necessary to interface with connected hardware and to function as an integral part of the DDC system

3.	Provide the number of units necessary for proper system operation and specified response time, but in no case less than the number of units indicate on the drawings

4.	Provide Audio tone generator as an integral part of system to activate on detection of alarm received. Audio tone shall be capable of being enabled or disabled on operator command

5.	The entire system data base must be loaded from magnetic data storage unit and verified (or backed up) in less than 15 minutes with the system off-line or 30 minutes with the system on line

6.	Functions to include:

a.	Management of tasks.

b.	Trouble shooting advisories.

c.	System supervision.

d.	Capacity and scan rate to manage entire system scheduled in required response time

e.	Compilation, assembly, debugging of DDCP software.

f.	Downline program loading to DDCPs.

g.	Supervisory control of DDCPs.

h.	Storage and processing of DDCP programs and data, and graphics.

i.	Communicating and apportioning data to peripherals as required.

j.	Local data processing as required.

B.	Printer.

1.	Provide Graphics Printers complete with all required cables for use in generating hard copy of alarms, change of status, reports, graphics, etc. associated with system operation

a.	Free standing or desk top mounted as requested.

b.	96 character standard ASCII in accordance with ANSI X3.4, X 4.14.

c.	Adjustable sprockets to 132 columns per line.

d.	Minimum speed 150 characters per second.

e.	Character spacing 10 per ^2.54 cm^ !(1 in.)!.

f.	Eight lines per in. maximum.

g.	Standard form size, sprocket fed fan-fold paper, with multiple copy capability

h.	Programmable control of top-of-form.

i.	Variable (multiple) line skip capability.

j.	Noise level: no more than 75 dba at ^1.52m^ !(5 ft)!.

k.	Alarm report shall have distinctive alarm printout when condition is off normal, such as elongated bold face double width character, red print. Printing able to be switched form normal to alarm as required by software

2.	Provide the number of units required for proper system operation but in no case less than one unit for each HOST being used

C.	Graphics display.

1.	Provide color graphics display for use in displaying status reports, alarm messages and operator information

2.	Provide color graphics card with sufficient graphics memory to support a minimum of 16 colors and 640 x 350 lines of resolution

a.	Full standard ASCII 96 character generator in accordance with ANSI X3.4, X4.14

b.	Data rate adjustable to 9600 baud.

c.	Minimum size 13 in. diagonal CRT.

d.	Screen capacity 25 lines of 80 characters.

3.	Provide the number of units required for proper system operation but in no case less than one unit for each HOST being used

D.	Direct Digital Control Panels (DDCP)s.

1.	DDCP's shall be microprocessor-based. Controllers shall have memory error checking. Upon detection of a memory error, controller processor shall correct error or halt to prevent erroneous operation

2.	Support operation of portable or integral maintenance operators terminal (MOT) as noted

3.	Shall convert information to digital form for transmission. Minimum of 12 bit resolution for D/A and A/D convertors

4.	Monitor and control its functions as a stand-alone unit if HOST communications are down

5.	Include a network card for communication with the HOST and other DDCPs

6.	Meet FCC requirements for Class A computer devices.

7.	Immune to EMI and RFI radiated noise (e.g. Walkie-talkies within a 10 foot radius of the closed DDC enclosure)

8.	The DDC system shall be supplied with a minimum of 72 hours of battery backup for the RAM and real time clock. Provide automatic restart and battery recharging upon restoration of power

9.	The DDC system shall contain in its program a self-test procedure for checking the digital display, and by means of a non-destructive routine, check the computer and its memory. It shall display advisories for maintenance, performance, and/or communications problems

10.	Analog inputs and outputs shall be continually monitored for failure. When a sensor is in a trouble condition the sensor shall be reported as failed. Calculation will use a user defined default value. Failure limits shall be user defiable. Default value may be: the last value, a fixed value or a calculation based on other sensors

11.	The DDCP shall have input and output capacity as indicated on the drawings

12.	The DDCP shall be expandable by adding additional input/output logic cards that operate through the processor of the DDCP. The processor in the DDCP shall be able to manage remote field interface units, thereby expanding its control loop and energy management point capacity

13.	Input output logic cards.

a.	Analog input (AI) - accept industry standard 4-20ma,0-5v, 0-10V, 3-15 psi and thermistor analog signals: provide (below 50v) integral power supply for analog sensors. Must accept signals from sensors with remote power supply if required. Isolate grounds if required for proper operation. Minimum of eight per DDCP

b.	Analog output (AO) - provide industry standard, 3-15 psi, 4-20 ma, 0-5v and 0-10v analog output signals. Isolate grounds if required for proper operation. Minimum of eight per DDCP.

c.	Digital input (DI) - accept, non-powered, binary contact closure signals. Provide pulse counting capability of at least 10 closures per second. DI circuit shall be electrically isolated from DDCP logic card. Minimum of eight per DDCP

d.	Digital output: maintained or momentary electrical relay with suitable rated isolated contacts for start stop and mode change of devices as scheduled Minimum of eight per DDCP

e.	Logic Card Design Features:

(1)	Micro-processor based.

(2)	Key cards to prevent reversal.

(3)	Identify each card with its part number denoting card type, card rack and connector position

(4)	Position in vertical plane.

(5)	Utilize bussed power distribution system designed for use with logic modules

14.	Slots for plug-in printed circuit point modules.

15.	Factory prewired panel with terminal strips for connection to field sensors, contacts, control devices

16.	Provide power supplies for input equipment with transient Power Line Surge Protection

17.	The DDC shall maintain long term accuracy of resistance sensing elements by using corrective algorithms to compensate for long term drift or drift due to ambient temperature changes. The maximum allowable drift shall be 0.5 percent of full range

18.	Cabinet:

a.	Pedestal base floor mounted or wall mounted metal cabinet.

b.	Full front hinged door.

c.	Locking handle with master key.

d.	Non-glare baked enamel finish; color: manufacturer's standard, as approved

19.	Enclosed plastic encased control diagram.

E.	Maintenance Operators Terminals (MOT): MOT terminal shall be provided for use in the event of a host computer failure or local maintenance Provide minimum of one portable MOT's with a plug-in feature or minimum of one per MER permanently installed. Provide rapid and simple connection to any DDCP. MOT designed to automatically and continuously poll remote DDCPs on the same data transmission cable. Provide following functions

1.	Display the status and value of each point.

2.	Display all points in alarm.

3.	Command any digital load or analog set-point.

4.	Add and delete points.

5.	Enter or modify DDC algorithms and parameters.

6.	Interface with cassette or floppy disk interface for program load, save and verfication routines

F.	DDCP software load device: Provide a floppy disk or cassette tape loading device and necessary interface hardware and software for the system user to load, save, and verify DDCP programs directly into DDCP's. Note: it shall be possible to downline load software to DDCPs from HOST as well

2)	CONTROL CONSOLES

A.	Console: an assemblage of peripherals, hardware, software, to serve as operator interface for monitoring and controlling system, located in control centers as noted

B.	Console fully integrated, totally enclosed containing listed items unless otherwise noted. Console configured for use by single operator

C.	Provide human engineered equipment for most efficient operational utilization and organized appearance. Coordinate overall dimensions and appearance of console with other requirements in respective area as directed by authorized representative. Finishes and layouts approved by authorized representative. Coordinate air conditioning requirements as provided under other Sections

D.	Wiring, conduits, cables, concealed. Exposed wiring not permitted. All raceways to enter consoles through floors or walls. If a raised floor o underfloor trench is desired, all work to be provided under this Section and Approved by Construction Representative

E.	Provide system consoles with operator functional capability and equipment. Minimum requirements listed, provide additional equipment to achieve specified performance

NOTE: LIST CONSOLE NAMES, CAPABILITIES AND EQUIPMENT AS APPLICABLE.

1.	Console Name: Facilities Operations.

a.	At the console provide a seconde CRT w/keyboard and printer to monitor the life support system. All life support system alarms shall be segregated to this terminal

b.	Operator capability:

(1)	Overall site operations.

(2)	HVAC control.

(3)	Maintenance/safety alarm reporting.

(4)	Energy and other management oriented reporting.

(5)	Miscellaneous site information and controls.

(6)	DDCP supervision, application, programming, diagnostics.

(7)	Parallel backup for any other console during startup, failure or high traffic periods

(8)	Reprogramming and system modification.

(9)	Life support system monitoring.

c.	Equipment:

(1)	Host processor.

(2)	Color graphic CRT w/keyboard.

(3)	Alarm, logging and graphic printer.

(4)	Monochrome CRT, keyboard and alarm printer (life support).

d.	Location: engineering control center (lower level, sector C).

3)	COMMUNICATIONS NETWORK (NETWORK)

A.	Priorities:

1.	System shall observe following priorities:

a.	Critical safety alarm.

b.	Change of state alarm.

c.	Out of limit alarm.

d.	Operator request or command.

e.	Automatic log.

f.	Maintenance alarm.

g.	Advisory message.

B.	Response Time:

1.	Time between occurrence of alarm or status change, its processing, display or printout shall not exceed the following times irrespective of other system or operator functions

NOTE: INTEGRATED SYSTEMS ONLY

a.	Electrical, Mechanical, life support: Critical - 10 seconds.

b.	Electrical, Mechanical, life support: Maintenance - 20 seconds.

c.	Processing of change of state as input to application program: 30 seconds

2.	In event of simultaneous alarm conditions, print at rate not slower than one per 10 seconds without loss of any alarm signal

C.	Response to Operator Commands or Requests:

1.	Following response times must be achieved subject to previously mentioned response times and priorities at console

a.	Start/stop-10 seconds.

b.	Mode change-10 seconds.

c.	Setpoint change-10 seconds.

d.	Initiation of log-20 seconds.

e.	Summary request-20 seconds.

f.	Program parameter change-60 seconds.

g.	Graphic selection-10 seconds.

D.	Data Trunk Cable:

1.	Install accordance with DDCS manufacturer's recommendations. Describe in shop drawings

2.	Current and voltage limiting devices at each DDCP connection.

E.	Reliability. Provide maximum system and signal reliability to include:

1.	Line supervision of DTC.

2.	Transmission word format immune to line noise, electrical interference.

3.	Automatic restart after power outage and restoration.

4.	Automatic error analysis to prevent nuisance alarms.

5.	Tamper detection in form of annunciation at control consoles if printed circuits are removed

6.	Description of quality assurance procedures in shop drawings for approval by authorized representative

7.	Data transmitted between HOST and DDCP's transmitted in digital form. Double transmission, echo transmission or multiparity bit technique or equivalent error detection method used to ensure message integrity. Transmission system failure annunciated immediately as "No Response" with display and/or printout of time, address of area failing to respond. Provide log of remote groups not responding

8.	Analog signals converted to digital values within 200 ft of sensing point or transmitted by 4-20ma signal. Provide same reliability measures stated fo digital signal transmission to converted analog signals; double transmission, echo transmission or accuracy check

9.	Total systems immune form internally and externally generated sources of electrical noise; correct as directed without additional charge

10.	Note that in some cases, transmission cables will be run with other communication cables from other sources. Shield all cables run in this condition

4)	SOFTWARE

A.	General:

1.	DDCS contractor shall supply fully documented software packages to meet operating requirements and match hardware characteristics

2.	Program development and implementation: coordinate with authorized representative engineer and/or other contractors to fully implement, optimize and commission the following programs to the satisfaction of owner and authorized representative

3.	Although "Program" implies software, hardware solutions acceptable after review and approval of authorized representative. Such differences considered deviations and presented as such

4.	Programming organized into discrete tasks for installation, maintenance, expansion. Document which tasks are performed during installation, off line a factory computer facility, or field programmed while system is operating. Provide details of memory usage, allocation, size of programs for Host & DDCP

5.	Provide for future point expansion capacity as approved and noted.

6.	Programming manual: Provide per requirements of "Owner's Manual".

B.	HOST executive Programs and Operating System:

1.	Real Time Operating System - The operating system shall be a real-time, multi-tasking interrupt driven operating system. The operating system provides the following services to the tasks in the system

a.	Task services (create/delete, suspend/resume, priority change, status inquiry, lock/unlock, timeslice)

b.	Full intertask queueing including semaphores.

c.	Memory allocation/deallocation.

d.	Real-time clock services.

e.	Character I/O services.

f.	Interrupt services.

g.	Disk storage utilization.

h.	Backup and verification of disk storage.

2.	Distributed I/O Processing - The HOST shall be an intelligent I/O controller which monitors the DDCPs for change of state, alarm and trouble conditions and upon request for information from system operator

3.	Point processing - The HOST reads the point data transmitted from the DDCPs, processers the data for change-of-state and alarms, and stores the current state of the points in its internal data base. Required data bases shall be developed as part of the software package and shall include all points indicated on the drawings and specified herein. Alarms shall be annunciated and logged on the printer. The HOST shall control points (start, stop, adjust, etc.) based on change-of-state and alarms

4.	Software Data Time Clock:

a.	Provide Software Time Clock which shall display date, time information where required to resolution of one minute and otherwise supply data to programs at resolution of one second; display real time clock in 24 hour format and date. Time and date resettable by simple keyboard entry

5.	Program Development - The system operator shall have the ability to develop and maintain all DDCP and HOST software through the HOST without additional cost to the owner

6.	DDC Algorithm Upload/Download - The HOST shall be capable of uploading/downloading executable object programs from/to any of the DDCPs. Provide software to allow uploading/downloading of DDCP programs without interrupting operation of the system

7.	Data File Management and Update.

a.	Provide software to manage input, output of information to and from data file within time limits specified

b.	Provide operator capability to assign or delete operating systems, groups or points from CRT keyboard without shutting down system and without reprogramming entire existing data file. Provide sufficient protected memory for future expansion of existing data file capacity, as approved. Provide program access procedures so that qualified field personnel may update file routinely

c.	All temperature control programs and energy management routines shall be defineable by the operator through an operator's terminal. It shall be possible for the operator to modify system functions. The system shall be provided complete with all equipment and documentation necessary to allow a trained operator to independently perform the functions listed below

(1)	Add/delete points to the system.

(2)	Enable disable points.

(3)	Generate displays of control programs.

(4)	Create, modify or delete control programs and algorithms.

(5)	Assign sensors and/or actuators to a control programs.

(6)	Tune control loops through the adjustment of control loop parameters.

(7)	Enable or disable control programs.

(8)	Select points to be alarmable and define the alarm state(s). Alarm functions to include: High and Low Limit, change of state, set point deviation, as minimum

8.	Person Machine Interface (PMI):

a.	Provide a person machine interface (PMI), at HOST, to allow all functions outlined below to be executed from the dedicated graphics display an HOST keyboard. Points are specified by point name using a three level identifier (e.g. Building, System, Point). The value for all analog point shall be addressed in engineering units (such as degrees Fahrenheit.) The status of all digital points shall be addressed by a descriptor (such as open/closed or on/off.

b.	Input from alphanumeric keyboard and single function keys. Text and procedures described in shop drawings. Provide keyboard functions including but not limited to

(1)	Display the value of a measured variable (i.e. temperature).

(2)	Start or stop equipment.

(3)	Monitor the status of equipment being controlled.

(4)	Acknowledge alarm, advisory message.

(5)	Silence audible alarm.

(6)	Display or print selected building system or point.

(7)	Start/Stop (motor, fan); open-close (damper).

(8)	Change control point setting.

(9)	Cancel log in progress.

(10)	Display selected graphic.

(11)	Trend point and interval.

(12)	Initiate motor summary log.

(13)	Initiate limit summary log.

(14)	Initiate program summary log.

(15)	Advance to next point or system in sequence.

c.	Commands:

(1)	Start/stop command: provide operator capability to send start/stop commands. Provide feedback from point to see that command was carried out. If not carried out within programmed time delay, change of state alarm message reported. Programs with multiple start commands automatically sequenced to prevent power surges. Stop command executed with no delay

(2)	Mode change command: Operator capable of initiating mode changes as noted on function schedule on system, building or site basis with single entry

(3)	Analog output adjust: provide remote analog control of local controllers and/or actuators. Monitor current status and related temperature measurement. Enter new setting with single function key. Provide printed record of alarm if device fails to operate or desired setpoint, as sensed by loop input, is not maintained.

(4)	Acknowlede alarms: provide system to automatically scan and display required alarm message. Information shall include time, date of alarm, point address, description, status or value and limits. Display shall include flashing and audible alarm at CRT and distinctive printout. Alarm acknowledged by single button which silences local audible alarm. Return to normal message shall printout with new status or value, time, date

(5)	Cancel command: provide "cancel" button to allow operator to terminate display, log or summary in process. Peripherals associated with log or summar signaled that output is no longer required

(6)	Command priority: provide command priority levels as follows:

(a)	Manual keyboard entry.

(b)	Energy management programs.

(c)	Automatic control programs.

(7)	Command reset: provide capability to manually or automatically reset command priority to a lower level

d.	Log Requests:

(1)	Trend log: provide automatic printout of status or value with engineering units of up to forty selected points on timed interval basis. Printout in columns with understandable point identification. Provide manua readout on demand. Operator may assign or delete trend points, select trend interval, (minute increments from 1 to 99 minimum) and start or terminate trend log. Trend log to be capable of storing up to 1000 valves for each point trended

(2)	Status log: provide operator capability to display analog value or digital status of points grouped by area, system or single point. Readout shall include date, time, address, system and point description, value and limits or status. Completeness of address shall determine whether area, system, or point is called. If status is off-normal, noted by flashing asterisk on CRT and distinctive printout. If controlled by automatic start/stop program, it shall include program number and start/stop times. Quick address of next point possible with "advance" function key. If alarm is received log shall be interrupted to inform operator and then log shall continue

e.	Summary request:

(1)	Alarm and OFF-Normal Summary: provide operator capability to request alarm summary of condition of uncleared alarm points as required. Informatio shall include time, date of alarm, point address, description, status or value and limits

(2)	Analog alarm limit summary: provide operator capability to monitor analog points, as designated in DDCS function schedule. Provide summary of limits and trip point differentials

(3)	Binary status and change of state alarm summary: provide capability to request binary status summary which shall include English language description of point, grouped by system or individual point. Points in alarm shall be indicated

(4)	Alarm lockout summary: provide capability to request summary list of alarms which have been locked out. Requested information displayed on CRT and alarm printer. Status, value, limits, time, date of lockout. System shall print out message noting time, date of change of lockout condition

9.	Automatic False Alarm Lockout:

a.	When systems shutdown, certain analog variables may drift past limits inhibit analog variable limit alarms inhibited until after system is restarted (time determined on individual basis)

b.	High and low limits may be added or deleted from program independently.

c.	Reporting of values during summary will not be affected by this program.

10.	Power Fail Restart.

a.	The DDC operating programs and data base shall be protected against loss of normal power by 72 hour volatile memory battery backup. When normal power is restored after failure, system operation shall begin without operator intervention

b.	Following recovery from a power failure all control points controlled by the DDC system shall be updated to the state they would be in had not powerfail occured, without operator intervention. This shall be sequenced according to a user defined softstart schedule

c.	Generate no unnecessary alarms upon restoration of normal power.

11.	Function (point) identification

a.	Provide consistent Function Identification code to command, report information on CRT Terminals and Printers

b.	Consecutive numerical system not acceptable. CRT terminal, shall provide simplified translation of code and instruction mnemonics. Shop drawings describing code: submit for approval. Following levels of code required as minimum

(1)	Building subdivision.

(2)	Building floor and room location.

(3)	System type: ie: air handler, utilities.

(4)	Sub-system: ie: Supply Air, Chilled Water.

(5)	Point: ie.,: supply fan.

12.	Operator access levels.

a.	Access to operator consoles limited unless operator enters correct password

b.	Each access level shall require entry of dedicated password. Each password shall be unique to an access level and to each operator as minimum requirement

c.	Minimum number of access levels: three; orderly grouping of functions:

(1)	Level one.

(a)	Receive and record alarms.

(b)	Display of point values and status.

(c)	Automatic programmed control continues.

(2)	Level two:

(a)	Point command functions: on-off, setpoint change, modify alarm limits.

(b)	All report and log requests except as noted below.

(3)	Level three:

(a)	Modify control programs.

(b)	Modify point information.

(c)	Modify operator passwords and access levels.

(d)	All other supervisory commands and reports.

d.	Command functions shall be additive in ascending order of access level.

e.	Provide a log-on procedure to gain access to the system. A minimum of 8 unique passwords shall be available with 3 access levels

NOTE: DELETE IF N.A.

C.	Application Programs:

1.	General:

a.	These application programs shall be separately described and detailed in shop drawing submittals as described in "Shop Drawings"

b.	Intent: Provide operable programs. Where references to monitored, controlled, remote, or central operator functions are made in program description, are required for program operation, they shall be provided whether or not they are listed in function schedule or mentioned elsewhere in specification. Includes hardware and software

c.	Programs shall be executed by HOST and/or DDCPs with execution distributed to DDCPs where possible to increase total system reliability. HOST shall execute "GLOBAL" programs

d.	Programs initiated, editited and controlled via HOST on a fully on-line basis

e.	Programs shall be executed in "DEGRADED" mode upon failure of HOST or Network. Fully describe reduced capability of each program in "Degraded mode in shop drawings

2.	Totalization Program:

a.	System capable of totalizing any or all energies, any other analog value, or any or all equipment run times selected by operator

b.	Totalization of number of motor start-ups.

c.	Any total display on operator request.

d.	Summary of totals by classification on operator request.

e.	Reset of any total to zero by operator by keyboard entry on individual basis

f.	Operator may assign limits on every variable to be totalized: operator definable alarm message of at least 80 characters when total exceeds limits

g.	Any equipment with start/stop, change of state, or status only assigned for run time totalization

h.	Totals requested on system basis.

i.	Energy totalization of non-variable loads, such as lighting, which are under on-off control, from run time total multiplied by measured fixed load data

3.	Energy Calculation Program: Program shall calculate heat energy and total energy as specified in "Function Schedule". Energy calculations mad from following inputs: liquid or gaseous flow (with pressure, temperature compensation as required), input temperature, output temperature. Program shall monitor status contact for each calculated point to determine validity of energy calculated in context of time period defined for each system. Program shall store in memory and, upon operator request, output comprehensiv summary on point, system, building or entire complex basis. Units of power and energy selected by authorized representative

4.	Electric Demand Program (Forecasting, Limiting and Load Shedding):

a.	Provide programming to maintain demand level at operator set level by forecasting, selectively scheduling, shedding and restoring of preselected load to prevent new demand level from being exceeded. Load shed time minimized by rotating loads within priority group

b.	Demand pulse output by electric utility demand meter or watts transducer counted continuously by accumulator. At end of each sliding window interval, accumulator shall be reset. During interval, system shall read accumulated pulse count for meter every sixty seconds, based upon time remaining in demand interval and shall predict energy usage for interval

c.	Kilowatt rating of each load stored in computer memory to ensure proper number of loads being shed when excessive electrical demand is predicted. Fo scheduling purposes, each load assigned to one of four priority groups: Priority Group 1 and 2 - Automatically shed as required. Priority Group - Issue operator advisory to manually shed particular load by operator actio at console. Priority Group 4 - Similar to Group 3 but more critical equipment. Shutdown by local operator only

d.	Each group shall have a minimum of 50 loads assignable.

e.	When load shed condition exists, program begins searching for loads in Groups 1 and continues through four group until necessary number of kilowatts have been shed. Location at which group is entered for load shedding determined on rotational basis, thereby all loads subject to shed condition before any can be repeated, or on a fixed basis

f.	Once load is shed, program shall restore loads based on either time interval or on available demand basis or minimum off time (to cool large motors). Time restoration employed when load has been assigned restore time b operator, indicating maximum amount of time subject load can be in off position. After load has been interrupted for period of time equal to its restore time it shall be issued start command

g.	Loads restored on available demand restoration. When two successive calculations predict that demand shall be below operator set level, available demand restoration shall begin. Demand restoration procedure is opposite shedding procedure. Highest priority groups examined first, based on assumption that loads in Group 4 caused greatest inconvenience when off, while those in Group 1 caused least

h.	Programming compatible with "Sliding Window". Demand calculated at no greater than three minute interval. When maximum target is exceeded after allowable loads are shed, alarm shall sound, current demand in KW displayed and printed out with time of occurrence on alarm printer

i.	Assigning and deleting of loads from load shed program by operator through keyboard. Provide a minimum of 15 loads per priority group

j.	Current electric demand value displayed and printed out on demand by operator. Program shall also store maximum value of demand which shall be available to operator for display and printout on demand. Setting maximum demand shall be high level operator function. Time date and value of maximum demand printed out when it occurs

k.	Metering interfaces, devices and wiring necessary to meet control sequences: provided for by this contractor

l.	Shed and restore values assignable on line by operator.

m.	Degraded mode: loss of all or part of data trunk cable shall not cause the shed loads to restart and the electrical load to exceed setpoint. DDCP' shall be cabable of cycling connected loads in a standalone mode as to eliminate or reduce potential increases in maximum demand level

5.	Custom Applications Program:

a.	Provide a real-time control programming capability for customized control algorithms

(1)	Receive current data.

(2)	Operate on data.

(3)	Return results in time to take appropriate action.

b.	Real time inputs to program from:

(1)	DDCS sensing points.

(2)	Constants.

(3)	Calculations.

(4)	Time.

c.	Real time output to:

(1)	DDCS command points.

(2)	Relays, lights.

(3)	Command programs.

(4)	Printer-programs.

d.	Programs must be easy to use by DDCS operators and interleaved with remaining software so overall performance is not interfered with, delayed, or interrupted. Software complied in standard Fortram, Pascal or Basic formats. Analog operations shall include: Add, subtract, multiply, divide, square root, summation, enthalpy, absolute difference, totalizer difference, control command, less than, greater than, and equal to. Digital Operations shall include: Logic OR or Logic A or NOT B, Logic AND, Logic A AN NOT B, time delay, logic EXCLUSIVE OR, totalize time, control on, and control off

6.	Global interlocking: interlocking of sequences of operation with change-of-state of points, point values (both real and virtual) as well as time, shall be provided as a building block for applications of the system

7.	Scheduled start/stop (time of day) programs: An independent start and stop program time shall be provided for each system as noted. Assign independent start and stop times to equipment connected to a controller. Inputs: current time, day of week, month of year, and operator programmed holidays. Outputs: program start/stop command signals to air handling, heating or cooling systems

8.	Optimum start program: Provide for each piece of equipment or system, as noted. Program to minimize total energy consumption during daily start-up of each heating/cooling system; by calculating a start time for each heating/cooling system which shall bring its respective zone temperature to boundary of comfort zone at the time of occupancy start; control auxiliary devices (i.e. dampers) as noted, to minimize energy consumption during the start-up period. Provide variable algorithm factors (multipliers) to allow program to be "fine tuned" to match builidng's response

a.	Inputs to program shall be space and outside air dry bulb temperatures, "occupied" or "unoccupied" status indication of building or zone. Program outputs shall be start commands to air handling, heating, or cooling systems and morning warm up and cool down mode control.

b.	Continuously monitor the space temperature and outside air temperature of each system specified to be under optimized start control. Control algorithm shall start system at latest possible moment as necessary to warm space or, in summer, to cool the space down prior to scheduled occupancy. Selection of warm up or cool down to be accomplished automatically by program. Execute a maximum of one optimum start command per day for each point controlled from program.

c.	Optimum start program shall interface with enthalpy program as follows: If enthalpy program shows outdoor air as a valid cooling source, outdoor air shall be used for pre-cooling. Otherwise, program shall fully close OA dampers

d.	Program shall provide a minimum ventilation "on" state when two conditions are both satisfied: Occupancy start time has been reached, and spac temperature has reached comfort zone

e.	Initial set-up of program by contractor's empirical, or theoretical, calculations considering building construction, orientation, and mass; job sit tuning by simple keyboard entry of multiplier

f.	Provide adaptive algorithm to automatically fine tune multipliers.

9.	Optimum stop program: Provide an independent optimum stop program for each system noted to minimize total energy consumption during daily shutdown of each heating/cooling system; by shutting down system as much before end of occupancy as possible, but not so early as to let temperature drift out of specified comfort range

a.	Program inputs shall be space outside air dry bulb temperatures, "occupied" or "unoccupied" status indication for the building or zone, and maximum shutdown advance. Program outputs are stop commands to air handling, heating, or cooling systems

b.	Program shall continuously monitor space temperature and outside air temperature of each system under optimum stop control. If space temperature is at full load end of comfort range, the system shall be shut down at programmed"end of occupancy" time. If space temperature is somewhere within comfort range, shutdown time will be advanced. To prevent occurrence of stuffiness and occupant discomfort due to inadequate ventilation for an extended period, program shall accept a programmed limit of earliest practical stop time

10.	Duty cycle program:

a.	Conserve electric energy (KWH) by cycling fan systems, that do not need to be left running continuously

b.	Program inputs shall be fan status, space high dry bulb temperature, space low dry bulb temperature, maximum off percent, minimum off percent, and minimum off time. Program outputs shall be fan control

c.	Start of occupancy shall be start time of duty cycle program.

(1)	The fan shall cycle no faster than allowable number of starts per hour for motor controlled

(2)	Fan shall not cycle so slow that a 25 to 30 percent off time cannot be achieved under light load with a maximum off time

(3)	Maximum off time percent shall give adequate ventilation.

(4)	Minimum off time shall be as required, by motor manufacturer.

11.	Enthalpy Control Program (Optimization based on outside - return air enthalpy)

a.	Provide programming to minimize cooling load on mechanical refrigeration equipment

b.	Program to position outdoor, return air dampers based on region of psychrometric chart in which outdoor ambient conditions fall and comparison of outdoor-return air enthalpy

c.	Program coordinated with start-stop optimization program and shall execute every 10 minutes

d.	Program to calculate return air enthalpy through inputs of return air dry bulb, dew point temperature of return air to system, outdoor enthalpy through inputs of dry bulb, dew point temperature of outdoor air associated with AC system's intake. Program to compare enthalpy of outside and return air to determine region for each system, switch system for optimum operation associated with region

e.	Regions and associated operations:

(1)	Region I: When outside air dry bulb temperature is below desired supply air setpoint, outside and return air mixed to obtain desired supply air temperature without use of mechanical cooling

(2)	Region II: When outdoor air enthalpy is below enthalpy of return air and outside air dry bulb temperature is between desired leaving coil temperature and return air dry bulb temperature, system shall operate on 100 percent outdoor air

(3)	Region III: When outdoor air enthalpy is higher than enthalpy of return air, system shall operate on minimum outdoor air. Also, when outdoor air enthalpy is lower than return air enthalpy and outside air dry bulb temperature is above return air dry bulb, system shall operate on minimum outdoor air

f.	System to print any mode change or change in region of operation.

12.	Graphics programs:

a.	Color graphics package shall provide displays to facilitate operation and understanding of both the process systems and the Direct Digital Contro Instrumentation Subsystem. All monitoring and control points shall be dynamically updated at least every 15 to 20 seconds. All alarm point shall b instantaneously updated independent of the color graphics display refresh interval

b.	The color graphics package shall be operated at any time without conflicting or impeding such operations as the access of computer I/O, data and alarm logging or remote operation

c.	The color graphics shall be stored on disk.

d.	Graphics generation and editing via interagtive, high level language.

e.	Provide a library of symbols to consist of but not limited to the following devices which are selected by suitable mnemonic or keyboard entry for generation of total systems graphics. All symbols shall conform to ISA standards. Describe method of graphics generation and symbol library in proposal

(1)	Pump.

(2)	Valve, two way.

(3)	Valve, three way.

(4)	Flow element.

(5)	Pressure element.

(6)	Fan.

(7)	Chiller.

(8)	Boiler.

(9)	Vertical piping.

(10)	Horizontal piping.

(11)	Pressure reducing valve.

(12)	Damper.

(13)	Limit switch.

(14)	Flow switch.

(15)	Temperature switch.

(16)	25 field assignable symbols.

f.	Automatic Graphic Display:

(1)	Provide system to select associated graphic display in response to alarm to assist operator in locating exact location of alarm

(2)	Manual display command shall override automatic command.

g.	Graphics:

(1)	Provide minimum of 25 graphics.

(2)	Provide graphics for but not limited to the following.

(a)	Floor plans showing status of associated points within area including but not limited to: smoke detectors, HVAC equipment. Indicate locations of equipment within area such as DDCPs, MERs, space temperature sensors

(b)	Separate Air and Water Systems Riser Diagrams showing all systems in Block Diagram Form. System status (on off and/or alarm) shall be indicated. Risers shall include common sensing points such as outside air, supply and return temperature in common piping system

(c)	Fan systems. Show associated general, transfer and toilet exhaust fans

(d)	Water systems. (chillers, boilers, cooling towers, heat exchangers, and associated pumps)

13.	Trend graph.

a.	Provide graphing software to produce plots of trended variables versus time. Time span of graph shall be operator selectable

b.	Graph output to CRT or printer.

D.	Advisory message program.

1.	Provide system to select associated message in response to alarm to assist operator in responding to alarm condition

2.	Manual display command shall override automatic command.

3.	Provide message generation program to create custom advisory messages for display at Graphic Display or report printers. Multiple messages may b linked together to form longer messages

E.	Direct Digital Control Programs

1.	General:

a.	DDC Program Development - Development and maintenance of DDC programs may be done in the HOST. Required data bases shall be developed a part of the software package and shall include all analog, digital, and alarm points indicated on the drawing and specified herein

b.	DDC Algorithm Download - The executable object programs shall be downloaded to any of the DDCPs from the HOST.

c.	Provide software to allow for storage of DDC programs in the HOST. Provide software to allow for retrieving this code from the HOST and downloading it to the DDCP

d.	Diagnostics - The system operator shall have ability to access the system for tracing failures. As a minimum, this software should permit the following capabilities: addressing and interrogating of all electronics withi the system; displaying input or output values of the system variables; and determining failures to the card level within the system

e.	These application programs separately described and detailed in shop drawing submittals. Description shall include

(1)	Detailed description of how Contractor's program meets application program specified

(2)	Detailed, complete macro flow chart of program.

(3)	List of remote points utilized for each program.

(4)	History of development and past use, if any, of program.

(5)	Explanation of how each parameter value in program is determined; i.e., measurement, "look-up table," mathematical approximations to empirical curves, internal computation in program

f.	Intent: Provide operable programs. Where references to monitored, controlled, remote, or central operator functions are made in program description, or are required for program operation, they shall be provided whether or not they are listed in function schedule or mentioned elsewhere in specification. Includes hardware and software

g.	Software shall include complete operating system, energy management application packages as standard control algorithm application packages, and a owner/user custom control and calculation application packages complete with interpreter

2.	The operating system software: shall be DDCP resident, and operate independently of Host computers; control communications between maintenance operators terminal, controllers and I/O modules; accept analog and digital inputs, produce analog and digital outputs; contain built-in diagnostic routines

a.	Provide automatic restart of equipment based on current program time without operator intervention

b.	Standalone capability: if HOST or data trunk cable fails the DDCP shall continue to function. If, by failure of another device in the system, information critical to a DDCPs function is lost default values or subroutines will automatically be used to approximate critical information to ensure continued control

c.	Communication with HOST and other DDCPs via communications link.

d.	Real time operating system capable of time of day scheduling and other time based functions

e.	Alarm processing to include: change of state, high and low analog limits, setpoint deviation, two levels of alarm priority

f.	Local commanding and alarm annunciation via MOT.

g.	Minimum input/output capacity: 8 analog input, 8 analog output, 8 digital input, 8 digital output

3.	Operator access: Each DDC shall be provided with the ability to prevent unauthorized access to its software program. This shall be accomplished by a keyboard or cabinet lock or through software programming. In the locked or unauthorized position, the operating characteristics of the DDC cannot be changed, although inputs, outputs and set point values can be displayed. In the unlocked or authorized position, the ability to change the DDC program shall be unhindered

4.	DDCP application software: Provide as integral part of each DDCP. Shall not be dependent on higher level computer for operation. Consist of discreet programs, in any combination, in coordination with control sequences. DDCP application software shall be resident and callable through Maintenance Operators Terminal, with proper password

a.	The DDC programming language shall be designed for Facilities Automation and Control applications. All DDC programming, editing and database generation, control and reporting functions shall be performed at the main graphics display of the HOST. DDC software shall support the following control modes

(1)	Two-position (on-off, slow-fast, etc).

(2)	Floating.

(3)	Proportional (P), direct and reverse acting.

(4)	Proportional plus Integral (PI).

(5)	Proportional, Integral, plus Derivative (PID).

(6)	Anti integral wind up.

(7)	Adaptive gain.

(8)	Cascade.

(9)	Programmed interlock logic.

(10)	Dead band switching and control.

(11)	Incremental control.

b.	Response time: Programs shall be executed at least once per second. Total control loop response time from change of input to measurable change o output (i.e. pressure change) shall not exceed three (3) seconds

c.	It shall be possible to fully create, modify or remove control algorithms within a specific DDCP while it is operating and performing other control functions. Each control loop shall be fully user defineable in terms of

(1)	Sensors/actuators that are part of the control strategy.

(2)	Control mode.

(3)	Gain.

(4)	Control action.

(5)	Sampling time.

d.	Each DDCP shall be capable of performing the following energy management routines as a minimum

(1)	Time of day scheduling.

(2)	Start/stop time optimization.

(3)	Peak demand limiting (alone or as part of demand limiting program in HOST)

(4)	Duty cycling (temperature compensated).

(5)	Economizer control.

(6)	Enthalpy changeover.

(7)	Supply air reset.

(8)	Outdoor air reset.

(9)	Event initiated programs.

e.	The owner shall be able to create customized control strategies based upon arithmetic, Boolean or time delay logic. The arithmetic functions shall permit simple relationships between variables (i.e., plus, minus, divide, multiply) as well more complex relationships (i.e. square root, exponential)

5)	Compressed Air System - U.C.

A.	Compressors:

1.	Quantity: 2 (1 duplex).

2.	Capacity of each compressor: sufficient to supply required air volume: when operating maximum 1/3 of time. Submit all sizing calculations

3.	Motors: Efficiency as required under "General Mechanical" section.

4.	Lubricated recipricating type.

B.	Air storage tanks:

1.	Quantity: 1.

2.	Total capacity: 15 minutes without compressor operation.

3.	Steel: hot-dipped galvanized after fabrication.

4.	Working pressure: minimum 200 psi.

5.	Constructed, stamped in accordance with ASME Code for Unfired Vessels

6.	Valved drain connection.

C.	Accessories:

1.	Alternator for automatically changing starting sequence of compressors, lead-lag control

a.	First compressor: operates between 90 and 70 psi.

b.	Second compressor: automatically starts if tank pressure falls below 65 psi

2.	Automatic traps on compressed air storage tanks, air dryers, piped to drain

3.	High-efficiency prefilters and after filters 99 percent oil, 03 micron solid particle removal

4.	Intake silencers.

5.	Relief valves.

6.	Pressure switches.

7.	Gauges.

8.	Refrigeration type air dryer; to lower atmospheric dewpoint to 38 deg F dewpoint

9.	Drains.

10.	Bypasses.

11.	Shutoff valves.

NOTE: COORDINATED WITH MECHANICAL SPECIFICATION.

12.	Vibration isolators for compressors, piping in accordance with Section "Vibration Isolation"

NOTE: OMIT IF NA

6)	CONTROL CABINETS

A.	Freestanding or front access wall-mounted type.

B.	Doors: maximum 3 ft (.9m) wide.

C.	Provide with: Framed, plastic-encased control diagram of respective system secured to cabinet (on the inside of door)

7)	FIELD I/O HARDWARE

NOTE: DELETE NON-APPLICABLE DEVICES

A.	General:

1.	Provide field I/O devices as indicated on mechanical plans, control flow diagrams and as required to meet specified performance

2.	Where performance specifications exceed capabilities of hardware specified, performance governs

3.	Distance from analog input sensors to DDCP not to exceed 200 ft. All analog input signals converted to 4-20 ma current output at sensing point

4.	Minimum contact rating: 5 amp 110 volts resistive.

5.	Switch differential shall be adjustable as required to provide proper system control, or as noted

6.	Sensor power supplies in DDCP.

7.	Devices UL listed for electrical safety where applicable.

B.	Sensors transmitters:

1.	General:

a.	Accuracy, full scale, or as noted, overall, from sensed parameter to digital readout at DDCP

b.	Consider inaccuracies introduced by sensor, transmitter, wiring, I/O module and A/D convertor

(1)	Temperature and pressure: plus or minus 1-1/2 percent of scale (or as noted)

c.	Maximum transmitter spans (operating point at mid scale).

(1)	Room temperature: 50 deg F.

(2)	Chilled water, 50 deg F.

(3)	Hot water temperature: 150 deg F.

(4)	Condenser water: 80 deg F.

(5)	Duct air temperature:

(a)	Heating: 100 deg F or as required by maximum duct temperature.

(b)	Cooling: 50 deg F.

(6)	Dew-point temperature: 100 deg F.

(7)	Room air and return air humidity: 60 percent RH.

(8)	Outside air: 150 deg F (-30 to 120).

d.	Transmitters shall have built-in circuit protection against reverse polarity and supply voltage transients

2.	Temperature transmitter assembly - liquid insertion used for differential temperature

a.	The assembly shall consist of a 100 ohm platinum RTD and a solid-state, 2-wire, 4-20mA transmitter contained in a housing suitable for pipe mounting

b.	The transmitter shall be matched to the temperature element and compatible with the DDCP. The assembly shall be factory calibrated to an accuracy of plus or minus 0.2 deg F over the entire operating span. The spa shall be as specified

c.	Include a stainless steel thermowell with a variable extension for pipe insulation and threaded connection to pipe, maximum length shall be 6 in. or 3/4 of pipe diameter, whichever is smaller

d.	Manufacturer.

(1)	Rosemount series 78S mounted in a series 79 Thermowell and a Model 444 transmitter

(2)	Hy-Cal Engineering Model RTS-37 mounted in a W-25 Thermowell and CT801-B-(range)-X2-X5 mounted in a H-15 housing, or approved equal

3.	Temperature transmitter assembly - liquid insertion.

a.	The assembly shall consist of a 100 OHM platinum RTD and a solid-state, 2-wire, 4-20mA transmitter contained in a housing suitable for pipe mounting

b.	The transmitter shall be compatible with the temperature element and the DDCP. The assembly shall be facory calibrated to an accuracy of plus or minus 0.75 deg F over the entire operating span. The span shall be as specified

c.	Include a stainless steel thermowell with a variable extension for pipe insulation and threaded connection to pipe, maximum length shall be 6 in. or 3/4 of pipe diameter, whichever is smaller

d.	Manufacturer.

(1)	Rosemount series 78S mounted in a series 79 Thermowell and a Model 444 transmitter

(2)	Hy-Cal Engineering Model RTS-37 mounted in a W-25 Thermowell and a CT801-B-(range)-X2-X5 mounted in a H-15 housing, or approved equal

4.	Temperature transmitter assembly - air stream, averaging.

a.	The assembly shall consist of an averaging type 100 OHM RTD housed in a flexible sheath and a solid-state, 2-wire, 4-20mA transmitter contianed in a housing suitable for duct mounting

b.	The transmitter shall be compatible with the temperature element and DDC. the assembly shall be factory calibrated to an accuracy of plus or minu .75 deg F over the entire operating span. Span shall be specified

c.	Probe length: 1 ft. 4 square ft. of duct area.

5.	Temperature transmitter assembly - air stream, non averaging.

a.	The assembly shall consist of a 100 OHM platinum RTD mounted on a 18 in. probe and a solid state, 2-wire, 4-20mA transmitter contained in a housing suitable for pipe mounting

b.	The transmitter shall be matched to the temperature element and compatible with the DDCP. The assembly shall be factory calibrated to an accuracy of plus or minus .75 deg F over the entire operating span. The spa shall be as specified

c.	Probe length: 18 in. or 1/2 duct diameter whichever is smaller.

6.	Temperature transmitter assembly - space.

a.	The assembly shall consist of a 100 OHM platinum RTD and a solid-state, 2-wire, 4-20 mA transmitter contained in a decorative ventilated enclosure similar in appearance to room thermostats

b.	The transmitter shall be compatible with the temperature element and the DDCP. The assembly shall be factory calibrated to an accuracy of plus or minus .75 deg F over the entire operating span

7.	Humidity and temperature transmitter assembly - outside air.

a.	The assembly shall consist of a capacitive type humidity sensing element with a 1000 OHM platinum RTD or a saturated salt-lithium chloride dewpoin assembly with two 100 OHM platinum RTD's (one for dewpoint and one for dr bulb) and two solid-state 2-wire, 4-20mA transmitters mounted in a housing suitable for outdoor installation. The sensing elements shall be installed i a weatherproof aspirating enclosure

b.	The transmitters shall be matched to their respective sensing elements and compatible with the DDCP. The assembly shall be factory calibrated to an accuracy of plus or minus 2 percent RH or plus or minus 2 deg F dewpoint over a range of 10 percent - 95 percent RH and an accuracy of plus or minus deg F dry bulb over the entire operating span

c.	Manufacturer.

(1)	General Eastern Model 620MP.

(2)	Hy-Cal Engineering Model CT-830-D-L (minus 20 to 140 deg F) (0-100 percent RH)-x21, or approved equal

8.	Pressure transmitter assembly - air streams.

a.	The assembly shall consist of a pressure sensor and a solid-state, 2-wire, 4-20mA transmitter contained in a housing suitable for duct mounting

b.	The transmitter shall be compatible with the pressure sensor and the DDCP. The assembly shall be factory calibrated to an accuracy of 0.05 in W.G. over a range of 0-4 in. W.G

c.	Probe: 8 in. pitot tube, brass.

d.	Manufacturer:

(1)	Brandt Model HT-1000.

(2)	Setra Systems Model 239 or approved equal.

(3)	Air Monitor Corporation - Veltron Series 5000 or approved equal.

9.	Flow transmitter assembly - water. Water Service.

a.	Assembly shall consist of an averaging pitot tube (annubar) flow element and a differential pressure transmitter. Assembly shall be provided with insertion/retraction mechanism complete with 1 in. cast steel ball balve, compression fitting, nipples, contoured weld coupling required for installation

b.	Annubar flow element shal be installed so that the toatl had pressure ports are set in line with the pipe axis facing upstream and the static pressure port is facing downstream

c.	Annubar shall be installed in plane with upstream elbow, with a minimum of 10 upstream and 5 downstream pipe diameters of straight run. If a modulating valve is installed upstream of the annubar, 25 pipe diameters of straight run are required

d.	Manufacturer:

(1)	Dieterich Standard Co. or approved equal.

10.	Differential pressure transmitter assembly - water.

a.	Shall consist of a differential pressure sensor and an electronic 2-wire, 4-20mA transmitter assembly. Shall be enclosed in a gasketed, dust and watertight case all body cavities open to the process fluid shall be provided with drain ports at the cavity bottom and vent ports at the top of th cavity. Both drain and vent ports shall be minium 1/4 in. NPT

b.	The differential pressure range span shall be adjustable to permit elevation of a mininum of 50 percent of range. This adjustment shall be made within the transmitter housing without a change of parts. The transmitter shall be capable of sustaining differential pressures in either direction, up to the body rating without damage to the instrument or a loss of accuracy or zero shift

c.	The transmitter shall be fully compensated for both process and ambient temperature variations. The transmitter shall be furnished complete with input gauges and factory mounted 5-valve manifold as manufactured by Anderson Greenwood, Model MGAV-S4

d.	Manufacturer: Rosemount, Model 1151 DP or approved equal.

11.	Watt transducer.

a.	The assembly shall consist of the hardware necessary to generate a 4-20mA signal indicating the total power being measured by the KWH meter provided by others

b.	If existing meter cannot be modified to provide a 4-20mA output, provide a watt transducer. Watt transducer shall be the hall effect type

c.	Manufacturer:

(1)	Scientific Columbis.

(2)	Ohio Semitronics or approved equal.

C.	Switches:

1.	Differential pressure switch - water.

a.	Brass bellows shall operate snap-acting SPDT contacts.

b.	Contact rating: 5 amps at 110 volts resistive.

c.	High and low sensing ports shall be 1/4 in. NPT.

d.	Adjustable operating range capable of sustaining 75 PSIG in either direction

e.	Manufacturer:

(1)	United Electric, Type 21K, or approved equal.

(2)	Mercoid - Series DP.

(3)	Penn Series -----.

2.	Differential pressure switch - air.

a.	Shall be diaphragm operated and actuate a SPDT snap acting switch. Operating point shall be adjustable. Range shall suit application

b.	Contact rating: 5 amps at 110 volts resistive.

c.	High and low sensing ports shall be 1/8 in. NPT connected to angle type tips designed to sense pressure

d.	Manufacturer:

(1)	Dwyer Series 1823.

(2)	Cleveland CLB-XXX or approved equal.

3.	Differential pressure switch - filters - indicating.

a.	Differential pressure switch shall incorporate gauge and switch setpoint indicators for continuous indication of applied pressure and switch settings. Operating point shall be adjustable. Range shall suit application

b.	Same.

c.	Manufacturer:

(1)	Dwyer Series - 3000.

4.	Damper end switch.

a.	Shall be oil tight, roller type, SPDT snap acting switch.

b.	Contact rating: 5 amps at 110 volts resistive.

c.	Mechanism to provide ample over travel to prevent stress on damper and control equipment

d.	Manufacturer:

(1)	Furnas Electric.

5.	Low limit thermostat.

a.	Shall have a 20-foot flexible vapor charged element when temperature sensed by any 12 in. segment of the element falls below setpoint (usually 35 deg F), thermostat shall operate SPDT or DPDT contacts as required

b.	Contact rating: 5 amps at 110 volts resistive.

c.	Manual reset.

6.	Pressure electric switch.

a.	Shall be pneumatically operated snap-acting switch with SPDT or DPDT contacts, as required

b.	Contact rating: 5 amps at 110 volts resistive.

c.	Setpoint adjustable from 3 to 20 PSI differential: 2.0 PSI fixed or adjustable as required

7.	Wall mounted time switch.

a.	Shall be spring wound timer with SPST contacts.

b.	Contact rating: 5 amps at 110 volts resistive.

c.	Manufacturer: M.H. Rhodes Model Mark-time.

8.	Electric room thermostat.

a.	Shall consist of a bi-metal or liquid filled sensing element and snap acting SPDT contacts housed in a ventilated enclosure suitable for wall mounting

b.	Set point shall be adjustable.

9.	Electric switches.

a.	Provide panel mounted electric switches as required.

b.	Contact rating: 5 amps at 110 volts resistive.

c.	Manufacturer.

(1)	Allen Bradley.

(2)	Square D or approved equal.

10.	Electronic to pneumatic transducer.

a.	Shall transduce DDCP electronic control signal to a pneumatic control output

b.	Shall be capable of passing at least 60 SCIM (17ML/SEC) with a 25 psig (175 kPa) supply air pressure and a maximum 2 psig (14 kPa) pressure drop

c.	Air consumption shall not exceed 20 SCIM (6 ML/SEC).

d.	Resolution shall be 0.1 PSI (0.65 Kpa).

e.	Shall be capable of failing to last commanded output pressure or 0 PSI (0 kPa)

11.	Control point adjustment.

a.	Shall consist of a 4-20mA output to reset control set point of a controller provided by others

b.	Provide all required hardware to prevent ground loops.

12.	Control relays.

a.	Contacts as required or as specified.

b.	Contacts rating shall be 5 amps at 110 volts resistive.

c.	U.L. listed as an electric appliance.

d.	Manufacturer:

(1)	Aromat.

(2)	Struthers Dunn.

(3)	Potter Brumfield.

13.	Auxiliary or alarm contacts.

a.	Contact and sensing device provided by others.

b.	Interface hardware and wiring under this contract.

D.	Relays:

1.	Electric pneumatic valve.

a.	Three-way valve operated by a continuous duty class A or class F coil.

b.	Provide pilot valve to amplify signal as required.

E.	Automatic dampers:

1.	Factory fabricated by automatic control system manufacturer.

2.	Construction:

a.	Blades:

(1)	Air foil type. Extruded aluminum or single piece double skin galvanized steel

(2)	Width:

(a)	Minimum: 4 in. (102mm).

(b)	Maximum: 8 in. (203mm).

(3)	Length: maximum 48 in.

(4)	Modulating dampers: opposed-blade type.

(5)	At points of contact: interlocking edges of compressible seals, selected for temperature of (minus -40 to 180 F) (minus 4.5 to 82 C) at specified leakage rate

(6)	Leakage when closed: guaranteed less than 10 cfm per square ft at 4 in. (102mm) wg static pressure, less than 5 cfm per square foot at 1 in. wg static pressure

(7)	U.L. class 1 listing.

b.	Operators: pneumatic, with sufficient power to limit leakage to specified rate

c.	Operating linkages:

(1)	Factory-assembled.

(2)	Capable of withstanding load equal to twice maximum operating force of damper operator, without deflection

d.	Frames:

(1)	Galvanized bar or channel steel.

(2)	Corner bracing for dampers above 4 sq ft (.4 sq m).

(3)	Full size of duct or opening in which installed.

e.	Trunions: steel.

f.	Bearings:

(1)	Bronze sleeve, nylon or ball.

(2)	Thrust bearings for vertically mounted dampers.

(3)	Maximum spacing: 48 in. (1.2m).

g.	Steel parts: zinc-crossed or with two coats rust-inhibitive paint.

F.	Smoke Dampers: same as control dampers except UL-555S approved for use as remote damper

G.	Automatic Valves:

1.	All automatic control valves shall be fully proportioning with modulating plug of v-port inner guides, unless otherwise specified

2.	The valves shall be quiet in operation and fail safe in either normally open or normally closed position in the event of the control air failure. Valves capable of operating at varying rates of speed to correspond to the exact dictates of the controllers and variable load requirements and shall be capable of operating in sequence when required by the sequence of operation

3.	Shall be sized by the control manufacturer and shall be guaranteed to meed the coil loads as specified. All control valves shall be suitable for the pressure conditions as noted for piping system in which installed and shal close against the differential pressures involved. All control valves shall have throttling guides and renewable seats and discs with stainless steel polished stems

4.	Valve operators shall be of the pneumatic, spring return, molded synthetic rubber diaphragm type size to insure tight seating against maximum differential pressure

5.	Valves 2 in. and smaller shall have bronze bodies with screwed ends. Valves 2-1/2 in. and larger shall have iron bodies with flanged ends. Valve shall have sufficient stuffing box protection to insure against leakage at hydrostatic head involved

6.	Characteristics:

a.	Chilled Water Service: equal percentage flow characteristics, single seated type except where pressure and flow combinations exceed rating for commercial valve operators, double seated valves may be used

b.	Hot water service: equal percentage, single seated. For water temperature 250 deg F or greater provide stainless steel plug

c.	Steam service: Linear flow characteristics, single seated. For steam at 50 psi or greater, provide stainless steel plug

NOTE: SPEC GAUGES OR MOVEMENT INDICATORS

7.	Provide mechanical direct reading movement indicators on all valves located in mechanical rooms and any valves 2-1/2 in. or larger

8.	Provide positive positioning relays on values operated in sequence, 2-1/2 in. or larger or if variations in system differential pressure effects spring range by more than 2 psi

9.	Valve action:

a.	Cooling valves normally closed.

b.	Preheat valves normally open.

c.	Reheat valves normally closed.

10.	Sizes:

a.	2 position valves: line size unless noted.

b.	Throttling valve: minimum pressure drop equal to pressure drop of exchanger, maximum pressure drop: 5 psi

c.	Relief and bypass valves: sized according to pressure available.

d.	Chilled water service: where load exceeds capacity of 4 in. control valve provide two valves of 50 percent capacity

e.	Steam and hot water service: Where load exceeds capacity of 2-1/2 in. valve provide two valves of one-third (1/3) and two third (2/3) capacity

H.	Butterfly valves.

1.	Shall be ANSI rated and capable of tight shut off when full system pressure is applied from either direction

2.	DISC shall be precision machined 316 stainless steel shaft shall be one piece construction, 17-4 PH stainless steel. Body shall be carbon steel. Seat shall be teflon and designed for modulating service

3.	Wafer flangeless type for positioning between ANSI flanges. Where installed in piping subject to removal, provide single flange or lugged type

4.	Valve actuator:

a.	Valve actuators shall be factory mounted and adjusted double acting air cylinder with gauges, PRV's, brass speed control valves and pneumatic positioner sized for smooth operation against and initial differential of 50 psig

b.	Valve actuators for outside use shall be factory mounted and adjusted, electric motor operated. Limiturque SMB or SMC, Rototork, or E.I.M

c.	Provide with manual override capability to operate valve upon failure of DDCP

d.	Provide with limit switches as required to perform specified functions.

5.	Size: line size unless noted otherwise. Submit: valve coefficients and percent opening versus flow

6.	Three way valves shall be factory assembled with flanged "T" and all required linkages

7.	Positive positioning relays:

a.	Provide for modulating valves and/or dampers operating in sequence. Provide on all valves 2-1/2 in. and larger

b.	Adjustable starting point and operating range.

NOTE: COORDINATE WITH MECHANICAL SPEIFICATION

8.	Damper actuator - variable inlet vanes.

a.	Shall be spring return piston type with rolling diaphragm or double acting cylinder type. Provide with factory installed positive position relay

b.	Provide actuators capable of operating inlet vanes in accordance with fan manufacturers recommendations

c.	Main air, control air, and all required interface hardware/tubing provided under this contract

NOTE: COORDINATE WITH MECHANICAL SPECIFICATION

9.	Pneumatic room thermostat single temperature setpoint.

a.	Shall consist of a bi-metal sensing element and a two pipe gradual volume amplifying relay housed in a ventilated enclosure suitable for wall mounting

b.	Sensitivity shall be adjustable from 1 to 4 psi/deg F (1.4 to 49.6 kPa deg C)

c.	Shall be capable of passing 200 SCIM (55ML/SEC) with a 25 psig (172 kPa) supply air pressure and exhausting 150 SCIM (40 ML/SEC)

d.	Room temperature indication, setpoint, and setpoint adjustment shall be concealed

e.	Shall be provided with a test port to measure control air pressure.

10.	Pneumatic room thermostat-dual temperature setpoint.

a.	Shall consist of 2 bi-metal sensing elements and 2 two pipe gradual volume amplifying relays housed in a ventilated enclosure suitable for wall mounting

b.	Sensitivity shall be adjustable from 1 to 4 psi/ deg F (12.4 to 49.6 kPa/ deg C)

c.	Each amplifying relay shall be capable of passing 200 SCIM (55ML/SEC) with a 25 psig (172 kPa) supply air pressure and exhausting 150 SCIM (40 ML/SEC)

d.	Each set point and sensitivity shall be independently adjustable.

e.	Room temperature indication, setpoint, and setpoint adjustment shall be concealed

f.	Each output shall be provided with a test port to measure control air pressure

8)	SERVICE KIT: (PROVIDE 2)

A.	Testing equipment:

1.	Calibrated air pressure gauges.

2.	Electronic thermometer.

3.	Amp meter for sensor calibration.

B.	Tools: screwdriver wrenches thermostat keys and squeeze bulbs.

9)	ENVIRONMENTAL CRITERIA FOR HARDWARE

OTED: DIDDCS CENTRAL HARDWEARE IS SPECIFIED FOR NFPA 72[D CHANGE FOR JOBS THAT DO NOT REQUIRED THIS LISTING

A.	DDCS central hardware (processors, console, peripherals): 50 deg F to 100 deg F 10 percent to 90 percent RH

B.	Indoor hardware: 32 deg F to 120 deg F, 10 percent to 90 percent RH.

C.	Outdoor hardware: -30 deg F to 150 deg F, 0 percent to 100 percent RH

D.	Provide heating and cooling systems for components not meeting these requirements

10)	APPROVED MANUFACTURERS

A.	Honeywell.

B.	Johnson Controls.

C.	Landis & Gyr Powers.

NOTE: INCLUDED ONLY IF REQUESTED BY OWNER.

Part 3 -	EXECUTION

NOTE: DELETE IF N.A.

1)	FLOW DIAGRAMS

NOTE: REFERENCE DRAWING NO.S OF FLOW DIAGRAMS

A.	Flow diagrams show sub-systems schematically to aid contractor in locating sensors and in understanding control sequences. Additional devices required by other sections of this specification, to meet performance, or due to variations in duct and/or piping configurations shown on mechanical or electrical plans shall be provided

2)	FUNCTION (POINT) SCHEDULES.

A.	AMCS function schedules included to assist contractor in developing schedule of functions for DDCS, it is not to provide total tabulation of functions

B.	Provide functions listed in schedule or as noted, determined in conjunction with application program specifications and drawings

C.	Schedule indicates initial assignment of remote functions to programs. This shall not override program requirements for on-line flexibility of assignment where designated

3)	INSTALLATION

A.	Air piping for the digital temperature control system

1.	General

a.	Furnish and install air piping for the digital control system specified. Piping shall be concealed wherever practical and shall be supported and anchored to prevent vibration and damage. Air lines shall not be hidden within duct work or insulation. It is the responsibility of this contractor to adequately size all tubing runs so that all tubing sub-systems have ample capacity to handle the controls connected. It is the intent of this specification to provide an air distribution system that divides the building into several areas of control which may be conveniently isolated for future maintenance and or repair (submit air distribution riser for approval)

2.	Air distribution systems.

a.	Provide an air distribution header in the vicinity of the air dryer specified below. The header and piping of the air dryers, etc., will be copper. Piping between the air compressor and header will be a size equal to the compressor discharge opening. Provide a flexible section of pipe to absorb the compressors vibration. The header shall feed high and low pressure distribution main.

b.	High pressure distribution system: Provide a valved outlet from the header for each high pressure main as well as a gauge downstream of the valve. Design distribution system so that the failure of any system component shall not effect more than 1/4 of air systems. Provide high pressure to

(1)	PRV stations in mechanical equipment rooms.

(2)	Variable inlet vane operators.

(3)	Central plant valve operators.

c.	Low pressure distribution system: provide a valved outlet from the header for each low pressure main as well as a gauge downstream of the valve. Provide a pop safety valve downstream of the valve set at 30 psig

d.	PRV station: at each PRV location, provide a parallel PRV station consisting of 2 pressure reducing valves (piped in parallel) and valved so on is a standby. In the common PRV discharge, provide a pop safety valve set at 30 psig

e.	Air mains shall be run near or on the ceiling parallel with the building construction lines

3.	Materials.

a.	All tubing shall be copper. ASTM L, or black single tube polyethelene ASTM Type 1, gauge 5, class C, self extinguishing (FR) plastic

b.	Exposed tubing shall be copper or plastic in EMT.

c.	Concealed but accessible locations: tubing shall be copper or plastic in EMT or jacketed bundled tubing

d.	Concealed inaccessible locations: tubing shall be copper or plastic in EMT or jacketed bundled tubing. Provide 20 percent spare tubes in multi-tub bundles

e.	Thermostat mains and branches, run vertical in a wall, may be copper or plastic

4.	Installation of compressed air tubing.

a.	Identification of tubes: the individual tubes will be consecutively numbered starting with the first system. As a number is assigned to a tube, that number will appear at the terminating points of that tube. (e.g., if Tube 2 was the number given to a master outside air reset signal, wherever that tube entered a panel, etc., it would still be Tube 2.) Provide for spare numbers at each local panel

b.	All tubing shall be supported at regular intervals to prevent sagging.

c.	All copper tubing, containing pressures over 30 psig, will have solder type fittings. All other fittings shall be compression type

d.	Whenever copper tubing crosses from a vibration isolated piece of equipment, to a stationary structure such as a wall, a short piece of plastic tube will be installed in between to absorb vibration

e.	Whenever copper tubing crosses a flexible connection, a short piece of plastic tubing will be installed in between to absorb vibration

f.	The final connection to moving control equipment such as damper actuators, shall be made via a 12 in. section of plastic tube

g.	Support shall be by means of non ferrous clamps or hangers fastened to the building structure

h.	Plastic tubing shall not be installed in the following areas:

(1)	Within an enclosure containing a heating element.

(2)	In ceilings used as a return air plenum.

(3)	Adjacent to hot pipes or lights.

(4)	Any surface whose temperature exceeds 125 deg F.

(5)	In service in excess of 25 psig.

i.	Plastic tubing shall be joined with either barbed or compression type fittings

j.	Plastic tubing installed in fan rooms and equipment rooms shall conform to the following

(1)	Single tubes shall be run in EMT.

(2)	Two or more plastic tubes shall be run in completely enclosed metallic raceways or EMT

(3)	Runs to terminal equipment (valves, motors etc.) shall be terminated in junction boxes, with the final single tube run in copper and connected to the device as described above

B.	Wiring:

1.	Provide following:

a.	Complete electric wiring installed connected to electronic or electric control sensing devices and to control system devices

b.	Wiring in control cabinets: connected to terminal strips.

2.	Wires labeled at ends to show location of opposite ends.

3.	Points of terminated strips permanently labeled to show instrument or item served

4.	Wiring in accordance with applicable codes.

5.	Provide wiring for control devices, monitoring devices, and interlocks as required for a complete system. Coordinate with Plumbing, Electrical an HVAC specifications for devices requiring wiring under this Section

6.	Testing: test air piping system with 30 psig for 24 hours during which time air pressure drop shall not exceed 10 psi

C.	Instrumentation:

1.	General:

a.	Locations: responsibility of control system manufacturer.

b.	Group instrumentation on ductwork and fan casing in organized manner. Locations to be consistant for each system

2.	Duct mounted item: devices mounted to sheet metal air ducts supported to ducts by self tapping screws, not less than two. Sensing elements exposed to air stream. Attachments to air ducts having exterior insulation provided with standoff spacers of plastic materials with insulating material firmly fitted around spacers, sensing element to leave minimum of exposed duct

3.	Averaging temperature sensor: Elements sensing air temperature in ductwork or casings, including low temperature safety cutoff thermostats

a.	Element spread out in sine-curve fashion.

b.	Supported by stainless steel grid or multiple bulb holders.

c.	Minimum coverage 4 sq. ft. of coil face area/linear ft of sensor element.

4.	Thermostats and space sensors:

a.	Submit sample to authorized representative for approval.

b.	Wall mounted unless noted otherwise.

c.	Mounting height 5 ft - 6 in. A.F.F. except in service corridors where subject to damage height shall be 7 ft., or if noted otherwise

d.	Provide insulated base where mounting on exterior wall is required.

e.	Non-indicating with key adjustment unless noted otherwise.

f.	Provide metal guards where mounted in mechanical, electrical, storage, maintenance areas or in any area where subject to damage

g.	Submit locations and mounting details for approval.

5.	Pressure transducers: locate within 50 ft of sensor in local control panel. Connect to sensors with tubing of diameter recommended by sensor manufacturer as required to prevent signal phase lag. Provide gauge tees at sensor and transducer for connection to pressure gauge

6.	Gauges: air pressure.

a.	Provide 1-1/2 in. gauges at DDCP to indicate pressure at each field device

b.	Provide 1-1/2 in. gauge to indicate air pressure on field mounted devices if located further than 100 ft or in a different room than DDCP

c.	Not required at:

(1)	Room thermostats.

D.	Direct Digital Control Panel.

1.	Adjacent to system served.

2.	DDCP located in mechanical rooms, communication closets, or areas as noted. Locations and dimensions submitted for review prior to placement

3.	Mounting: centerline 5 ft - 6 in. above finished floor except:

a.	Bottom: minimum 30 in. above floor.

b.	Top: maximum 7 ft - 0 in. above floor.

4.	If an air handling systems control points exceeds capacity of a single DDCP two DDCPs shall be provided with one for temperature control function and one for air pressure and volume controls

5.	Points used in the same control loop or algorithm shall be connected to the same DDCP

6.	Spare capacity: allow for 15 percent increase of each point type per DDCP location, or a minimum of two of each point type per DDCP location whichever is greater. Addition of points shall require only programming and input/output logic cards

E.	Local control cabinets:

1.	Adjacent to system served. (as approved)

2.	Locate the following in system local control cabinets:

a.	Switches and relays.

b.	EPs and PEs.

c.	Transducers and other required electrical devices.

3.	Mounting: centerline 5 ft - 6 in. above finished floor except:

a.	Bottom: minimum 30 in. above floor.

b.	Top: maximum 7 ft - 0 in. above floor.

F.	Dampers.

1.	Locate minimum damper to provide maximum mixing of air streams. Coordinate with mechanical contractor

4)	AUTOMATIC CONTROL

A.	General

1.	Supply, install necessary sensing, controlling and controlled devices, piping, wiring and commissioning of automatic control systems, so as to provide a complete control system, meet requirements of control sequences hereinafter specified, as noted, and in accordance with Contract Documents

2.	Failure mode: if HOST OR [COMMUNICATIONS [NETWORK FAILS TO OPERATE, <DDCP will continue to operate according to the Software Program residing in the DDCP.

3.	Control functions shall be executed within the DDCP. Loop control executed via direct digital control algorithms. Contractor to customize control strategies and sequences of control, and be able to define appropriate control loop algorithms and choose the optimum loop parameters for loop control All control loops shall be tuned to stabilize within plus or minus 1 percent of setpoint within 5 minutes of setpoint change or system startup.

4.	Maintain following temperatures within plus or minus 1-1/2 F of setpoint

a.	Cooling coils: leaving air.

b.	Preheat coils: leaving air.

c.	Mixed air.

d.	Space temperature.

5.	Maintain air flow rate at a constant volume without air flutter of fluctuation within a maximum variation of three (3) percent of the design air volume regardless of the magnitude, frequency, or speed of system static changes

NOTE: COORDINATE STARTER REQUIREMENTS WITH SECTION PROVIDING SAME.

B.	Operation of typical motor starter controls:

1.	HOA switches: supply fans.

a.	Safety devices interlocked with "hand" and "automatic" positions in series with motor controller holding coil circuit

b.	Interlocking (VIA software) with other fans and equipment of system through "automatic" position only

c.	"Hand" position for maintenance only:

d.	Remote starting from AMCS through Automatic position only. (except for smoke control modes which bypass safeties)

e.	Start up sequences and automatic control sequences as described on hereinafter shall operate in both automatic and hand position

2.	HOA switches: return fan, transfer fan, exhaust fan (software interlocked with supply fans)

a.	Remote starting from AMCS through "automatic" position only (except for smoke control mode)

b.	"Hand" position for maintenance operation only.

3.	Exhaust fans, such as general or toilet (operating independently).

a.	All safety devices interlocked with "hand" and "automatic" positions in series with motor controller holding coil circuit

b.	Remote starting from AMCS through "automatic" position only (except for smoke control)

c.	"Hand" position for maintenance operation only.

C.	Operation of typical control safety devices: Provide for all systems except as otherwise noted

1.	General.

a.	To be manually reset, hardwired and operate to protect system in the event of DDCP failure

b.	Provide auxiliary contact on each device for connection to DDCP as called for on point schedule

2.	Freeze protection thermostat (freezestat) - provide one freeze protection thermostat per coil section, wired to stop supply fan (VIA HARD WIRED CONNECTIONS), and alarm on DDCS

3.	Low static pressure limit switches: Provide static pressure switch with manual reset to stop associated supply fan and sound alarm at control console when static pressure at supply fan inlet section, falls below its setting. Provide for constant volume systems of 30,000 CFM and above and al VAV systems

4.	High static pressure limit switches: Provide high static pressure switch with manual reset, at the fan discharge, which shall stop supply fan an initiate a remote alarm at the Control Console when the static pressure exceeds its setting. Provide for constant volume systems of 30,000 cfm and above and for all VAV systems

5.	Damper end switches: Provide to prevent operation of fans until damper is fully open. Provide damper end switches as follows

a.	On 100 percent exhaust and outside air dampers on fans over 2000 cfm or with shut off static pressure of 2.5 in. w.c. or greater

b.	On normally closed return air dampers.

c.	On supply fan discharge smoke dampers.

d.	On dampers, which if closed with fan running, could cause distribution system damage

e.	On dampers as noted.

f.	Unless noted otherwise, when a fan is commanded to start (by AMCS OR HAND POSITION), the dampers will open, when open postition is confirmed via en switches fan will start through appropriate hardware and software interlocks

g.	Return damper end switch bypassed after startup sequence is complete.

D.	Operation of typical control devices: provide on all systems unless noted

1.	Dampers: normally closed.

2.	Variable inlet vanes: normally closed to minimum volume.

NOTE: FULL IN SYSTEM DESIGNATIONS

E.	Sequences of Operation - Air Systems.

NOTE: IN ALL OF THE FOLLOWING SEQUENCES, THE DESIGNER IS GIVEN A CHOICE AS TO WHICH STATEMENTS APPLY TO THE PARTICULAR PROJECT BEING DESIGNED. THESE CHOICE STATEMENTS ARE ENCLOSED IN PARENTHESIS. CHOOSE THE PROPER STATEMENT WORDING TO COMPLETE THE THOUGHT. ELIMINATE NON APPLICABLE STATEMENTS WHICH MA NOT BE ENCLOSED IN PARENTHESIS

<NOTE: FILL IN CORRECT AIR HANDLER DESIGNATIONS

1.	Variable air volume systems AHU-L-2 and AHU-P-2 to 6.

a.	General:

(1)	Minimum outside air damper, 2 position type, normally closed.

(2)	Maximum outside air damper, modulating type, normally closed.

(3)	Return air damper, modulating type, normally open.

(4)	Exhaust air damper, modulating type, normally closed.

(5)	Variable inlet vane damper, modulating type, normally closed to minimum position

(6)	Preheat coil control valves, modulating, normally open type.

(7)	Cooling coil control valves, modulating, normally closed type.

b.	Smoke purge:

(1)	Upon activation of smoke purge the fire alarm system will close a contact in the motor controller overriding all safeties causing the air handling unit to start. The DDC contractor shall provide electric-pneumatic switches wired to a terminal strip, which will be energized when the smoke purge contact closes. When the electric-pneumatic switches are energize they shall cuase the following to occur; supply and return fan variable inlet vane dampers to open fully, maximum outside and relief air dampers to open fully, return air damper to close

c.	System off:

(1)	When the system is off, all valves and dampers shall be in normally open or closed position, except for the preheat coil control valve, which shall remain under control at all times

d.	System on:

NOTE: FILL IN MISSING INFORMATION

(1)	The unit supply and return fans shall be (manually started) automatically started from the DDCS

(2)	When the supply fan starts, the interlocked return fan shall start simultaneously. When the system is energized, the minimum outdoor air damper will open 100 percent and smoke dampers located in the supply fan discharge and return air shall open 100 percent, closing their end switches, allowing th supply and return fan to start. When the supply and return fans are starte the control system will be energized. The DDCP shall, through a temperature sensor located in the supply fan discharge, control the cooling coil control valve in sequence with the preheat coil control valve to maintain its setting. The preheat coil control valve will be controlled by the DDC subject to a low limit type, preheat coil discharge thermostat to maintain a constant discharge temperature of (45) degrees regardless of fan status

(3)	A sensor located in the mixed air, will through the action of the software control loop, modulate the maximum outdoor air, return air and exhaus air dampers in sequence to maintain an adjustable mixed air temperature. The dampers shall be subject to overcall by an enthalpy program which will select either outside air or return air depending upon which contains the leas amount of total heat. Outside air sensor, acting through the DDCP which will return the system dampers to the minimum ventilation position when the outside air temperature exceeds a programmed adjustable setting

(4)	A smoke detector in the return air suction and a smoke detector in the supply fan discharge, which upon activation, shall through the fire alarm system de-energize the supply and the return fans and interlocked exhaust fans

(5)	A freezestat (one per coil section) in the preheat coil discharge will stop the supply and return fans whenever its settings is exceeded. Provided auxilliary contacts for annunciation on the DDCS.

NOTE: THE FOLLOWING PARAGRAPH IS ONLY FOR SYSTEMS CONTROLLED BY STATIC PRESSUR

(6)	A static pressure sensor located 2/3 downstream of the main supply duct, will through the action of the DDCP control loops, modulate the normally closed to 40 percent supply fan inlet vane dampers in Tandem with the return fan inlet vanes to maintain a constant system static pressure and differential

NOTE: THE FOLLOWING PARAGRAPH IS ONLY FOR SYSTEMS CONTROLLED BY DUCT MOUNTED AIR FLOW MEASURING STATIONS. FILL IN CORRECT PARAGRAPH NUMBER BEFORE FINAL RELEASE

(7)	Deadband type room thermostats will modulate their respective variable volume boxes in sequence with the reheat coil to maintain their set point. Upon a drop in room temperature, the room thermostat shall first modulate the variable volume box damper to the minimum position and upon a continued drop in room temperature, modulate the reheat coil valve. Upon a rise in room temperature the reverse sequence will apply

NOTE: CHECK MECHANICAL SPECIFICATIONS TO DETERMINE IF MAIN AIR IS REQUIRED AT EACH BO

(8)	Provide main air to each variable volume box if required.

e.	Warm-up cycle.

(1)	Provide a sensor in the return air, which will, through the action of the DDCP control loops, upon sensing a return air temperature below design conditions upon initial start up, cause the system to perform as follows

(a)	Outside air and exhaust dampers closed.

(b)	Return air damper and heating coil control valve open.

(c)	Variable volume boxes open.

(2)	When return air temperature reaches design conditions the system will automatically return to normal heating mode

f.	Cool down cycle.

(1)	Provide a sensor in the return air, which will, through the action of the DDCP control loops, upon sensing a return air temperature above design conditions upon initial start up, cause the system to perform as follows

(a)	If outdoor air temperature is below the return air temperature,

(A)	Outside air and exhaust dampers open.

(B)	Return air damper closed.

(C)	Cooling coil control valve and variable volume boxes open.

(b)	When return air temperature reaches design conditions, the system will automatically return to normal cooling mode

(c)	If outdoor air temperature is above the return air temperature,

(A)	Outside air and exhaust dampers closed,

(B)	Return air damper and cooling coil control valve open.

(C)	Variable volume boxes open.

(d)	When return air temperature reaches design conditions, the system will automatically return to normal cooling mode

g.	Night purge cycle.

(1)	During the cooling cycle, two hours (adjustable) before normal occupancy, the outdoor air temperature will be sampled. If it is determined that the outdoor air temperature is below design temperature, the system will be started on 100 percent outdoor air and exhaust without mechanical cooling and the VAV boxes shall be open 100 percent. At the end of this two hour period the system will go to cool down or normal cooling cycle as determined by the sequences described above

h.	Night heating cycle.

(1)	During the heating cycle, a night room sensor will cycle the system on 100 percent return air to maintain a lower than day time night temperature setting. During this cycle, the heating coil control valve and the variable volume boxes will be open 100 percent when the fan runs

2.	Constant air volume system - Process area unit and kitchen unit.

a.	General:

(1)	Outside air damper, 2 position type, normally closed.

(2)	Exhaust air damper, 2 position type, normally closed.

(3)	Preheat coil control valves, modulating, normally open type.

(4)	Cooling coil control valves, modulating, normally closed type.

b.	Smoke purge:

(1)	Upon activation of smoke purge the fire alarm system will close a contact in the motor controller overriding all safeties causing the air handling unit to start. The DDC contractor shall provide electric-pneumaitc switches wired to a terminal strip, which will be energized when the smoke purge contact closes. When the electric-pneumatic switches are energized they shall cause the following to occur; outside and relief air dampers to open fully

c.	System off:

(1)	When the system is off, all valves and dampers shall be in their normally open of closed position as stated above, except for the preheat coil control valve, which shall remain under control at all times

d.	System on:

(1)	The unit supply and return fans shall be automatically started by the DDCS

(a)	Based on space temperature setpoints for the process area unit.

(b)	Based on an occupancy schedule for the kitchen unit.

(2)	When the supply fan starts, the interlocked exhaust fan shall start simultaneously. All interlocks shall be hard wired. When the system is energized, the outdoor air and exhaust air dampers shall open closing their end switches, allowing the supply and exhaust fan to start. A temperature sensor located in the supply fan discharge will through the action of the DDCP control loops, control the cooling coil control valve in sequence with the preheat coil control valve to maintain its setting. The preheat coil contro valve will be controlled subject to a low limit type, preheat coil discharge thermostat to maintain a constant discharge temperature of 45 deg. regardless of fan status

(3)	A smoke detector in the exhaust air suction and a smoke detector in the supply fan discharge, upon activation, shall through the fire alarm system de-energize the supply and the exhaust fans.

(4)	A freezestat in the preheat coil discharge will stop the supply and exhaust fans whenever its settings is exceeded. Provide auxilliary contacts for remote annunciation on the DDCS

3.	Heating and ventilating unit, Boiler-Chiller Plant.

a.	General:

(1)	Outside air damper, 2 position type, normally closed.

(2)	Exhaust air damper, 2 position type, normally closed

(3)	Heating coil control valves, modulating, normally open type.

b.	Smoke purge

(1)	Upon activation of smoke purge the fire alarm system will close a contact in the motor controller overriding all safeties causing the air handling unit to start. The DDC contractor shall provide electric-pneumatic switches wired to a terminal strip, which will be energized when the smoke purge contact closes. When the electric-pneumatic switches are enegized they shall cause the following to occur; outside and relief air dampers to open fully

c.	System off:

(1)	When the system is off, all valves and dampers shall be in their normally open or closed position as stated above, except for the preheat coil control valve, which shall remain under control at all times

d.	System on:

(1)	The unit supply and hardwire interlocked exhaust fan shall be started and stopped automatically from the DDCS. The exhaust fan shall be interlocked to run only when the supply fan is run on high speed. All system fans shall start simultaneously

(2)	When the system is energized, the outdoor air and exhaust air dampers will open 100 percent, closing the damper end switches and allowing the fans t run

(3)	A temperature sensor located in the supply fan discharge will, through the action of the DDCP control loops, control the preheat coil valve to maintain fan discharge temperature at setpoint

NOTE: THE FOLLOWING PARAGRAPH IS FOR SYSTEMS WITH A CAPACITY OF 2000 CFM OR LESS

<NOTE: THE FOLLOWING PARAGRAPH IS FOR SYSTEMS WITH A CAPACITY OF 2000 CFM OR MOR

(4)	A smoke detector in the exhaust air and a smoke detector in the supply fan discharge, upon activation, shall through the fire alarm system de-energize the supply and the exhaust fans.

(5)	A freezestat in the preheat coil discharge one per coil section will stop the supply and exhaust fans whenever its settings is exceeded. Provide auxilliary contacts for annunciation on the DDCS

(6)	Summer vs. winter operation shall be determined by outdoor air temperature. Summer/winter operation shall function as follows

(a)	Summer - The supply and interlocked exhaust fan shall start, with the supply fan set on hig speed whenever the space temperature setpoint is exceeded. The preheat coil valve shall be closed

(b)	Winter - The supply fan shall start, set on low speed if the space temperature falls below setpoint

(7)	Both boilers shall be software interlocked to start the H&V unit on low speed when either boiler is in operation, to provide for boiler make-up air

NOTE: FILL IN PROPER SYSTEM AND FAN DESIGNATIONS

NOTE: FILL APPROPRIATE FAN DESIGNATIONS

4.	Exhaust fans (typical).

a.	When an exhaust fan is energized, first the discharge damper will open. When the discharge damper is fully open, its respective end switch will allo the fan to start.

b.	Upon a fire signal from the fire alarm panel, exhaust fans will shut down

5.	Unit heater controls.

NOTE: AMMEND AS REQUIRED COORDINATE WITH <HVAC for proper piping detail IE. Aquastat to be shown or not

a.	A unit mounted thermostat, supplied by the unit manufacturer, upon sensing temperature below its setting will cycle the unit heater fan to maintain its setpoint

6.	Fan coil units.

a.	General.

NOTE: SELECT APPROPRIATE PARAGRAPHS

(1)	The fan coil units shall be started and stopped via room thermostat. When the fan is started, a room thermostat, upon sensing temperature above its setting, will, modulate the unit cooling coil control valve to maintain its setpoint. When the room thermostat senses a temperature below its setpoint, the room thermostat will modulate the heating coil valve

(2)	When the fan coil unit is stopped, the cooling coil valve will close and the heating coil valve will open

NOTE: CHECK APPLICABILITY-REMOTE CENTRAL PLANT

7.	VAV boxes with reheat: Pneumatic, dead band type, room thermostat shall modulate reheat valve and VAV box in sequence. Aobve cooling setpoin (75 deg F) VAV box is modulated open to maintain setpoint. Below heating setpoint (70 deg F) reheat valve is modulated open to maintain heating setpoint. Between heating and cooling setpoints reheat valve shall be closed and VAV box shall be at minimum flow. When system is off reheat valve shall be closed. For warmup and smoke purge modes thermostat shall be overridden to fully open VAV boxes on a per zone basis

8.	VAV boxes: pneuamtic room thermostat shall modulate VAV box to maintain space temperature below setpoint 75 deg F. For warmup and smoke purge modes thermostat shall be overridden to fully open VAV boxes on a per zone basis

9.	Constant volume box w/reheat: pneumatic thermostat shall modulate reheat valve to maintain setpoint, 72 deg F. When system is off reheat valv shall be closed

10.	Fin tube radiation: Pneumatic daynight thermostat shall modulate radiation valve to maintain day temperature at 70 deg F and night temperature at 55 deg F

11.	Reheat coil control with remote sepoint adjustment: A pneumatic reciever-controller shall modulate teh reheat coil control valve, based on discharge temperature, to maintain setpoint. A pressure regulator mounted in a gang box (similar to Johnson Controls R-4000) shall be used to manually reset the discharge setpoint to prevent condensation on the tank glass. This remote setpoint adjustment shall be mounted on the wall in the exhibit area served and come with a locking cover

F.	Sequence of Operation - Water Systems.

1.	Refrigeration plant.

a.	General.

(1)	Refer to associated flow diagram.

b.	On.

(1)	Condenser and chilled water pumps shall start with their respective isolation valves closed. Pump isolation valves, and condenser and evaporator isolation valves shall gradually open over 30 seconds (adjustable). When flo is established in both condenser and evaporator via pressure differential switches, chiller shall start. Chiller supply temperature shall be maintained via integral controls.

(2)	A temperature sensor in the condenser water from the tower will, through the action of its respective DDCP control loop, upon a rise in condenser water temperature, first modulate the condenser water bypass valve open tto the cooling towers, to maintain ----- deg water to the condenser. Upon a continued rise in condenser water twmperature, the cooling towr fan will be started on low speed. Upon a continued rise in condenser water temperature the cooling tower fan will be switched to high speed

(3)	A differential pressure sensor, sensing the chilled water supply and return differential pressure will through the action of its respective DDCP control loo modulate the differential pressure control valve to maintain its set point

c.	Off.

(1)	Chillers off and condenser and evaporator isolation valves closed.

(2)	Condenser and chilled water pumps shall be off with their respective isolation valves closed

d.	Cooling tower winterization.

(1)	A basin temperature sensor, sensing the condenser water temperature in the cooling tower sump, will energize a strip heater to prevent the cooling towre sump from feezing. The strip will be energized whevr the outdoor ait tmemperature is below 40 degrees or the sump temperature is below 35 degrees

NOTE: THE FOLLOWING PARAGRAPH IS FOR ELECTRICAL WINTERIZATION

2.	Hot water system.

a.	General

(1)	Refer to associated flow diagram.

(2)	Hot water pumps shall start with their respective isolation valves closed, and open gradually over 30 seconds (adjustable)

b.	Primary Hot Water System.

(1)	Primary hot water pumps shall be manually started and stopped from the DDCS

(2)	When one of the primary hot water pumps is started isolation valve on the lead boiler shall open. The boiler shall start and maintain discharge water temperature at setpoint via its integral controls. The DDCS shall monitor each boiler discharge temperature and alarm if setting is exceeded

c.	Reheat coil, process and DW hot water system, and perimeter hot water system

(1)	Hot water circulating pumps shall be started and stopped from the DDCS. When pump status is proven the control system shall be energized

(2)	A temperature sensor in the hot water supply shall, through the DDCS, modulate the hot water return bypass valve to maintain the hot water supply temperature at 200 deg F (adjustable). The hot water supply temperature setpoint of the perimeter system shall be reset based on outdoor air temperature

d.	Hot water heat exchangers: preheat coil glycol system.

(1)	Secondary hot water pumps shall be started and stopped from the DDCS.

(2)	When one of the secondary hot water pumps is started the isolation valves on HX-1 shall open

(3)	A temperature sensor located in the secondary hot water supply from the heat exchangers will through the action of its respective DDCP control loop, modulate the primary hot water control valves to maintain a constant discharge temperature of 200 degrees (adjustable)

(4)	HX-2 is a spare for HX-1 and shall be controlled as described above. Switchover between HX-1 and HX-2 shall be done manually through the DDCS

(5)	Whenever the secondary pumps are shut down, the primary hot water valve will close and the control system will de-energize

NOTE: THE FOLLOWING PARAGRAPH IS FOR STEAM WINTERIZATION YES