H34.REV

AUTOMATIC CONTROL SYSTEMS

NOTE: FINAL DATE: JANUARY, 1988.

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work included in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for the following

1.	Compressed air piping.

2.	Compressed air equipment.

3.	Instrumentation.

4.	Local control cabinets.

5.	Automatic dampers.

6.	Smoke dampers.

7.	Combination fire and smoke dampers.

8.	Automatic valves.

9.	Interlock, control and monitor (indicator) wiring.

10.	Alarm panels.

B.	Automatic Control Systems (ACS) Manufacturer shall supply and install instrumentation and required components necessary for complete system, except items noted in the next paragraph. The ACS Manufactures shall be responsible for the Automatic Control System startup and its proper operation, and shall maintain its performance through the end of the guarantee period. This responsibility shall cover all devices, labor, subcontractors, etc., provided by him, in the execution of his contract

C.	HVAC Contractor shall install valves, dampers, air flow measuring units, wells and other devices supplied by ACS Manufacturer and smoke dectector supplied by the electrical contractor to be installed in ductwork, piping and HVAC equipment

D.	Maintain in conditioned spaces:

1.	Temperature shall be within plus or minus 1-1/2 deg F from set point, within design conditions

2.	Relative humidity shall be within plus or minus 2-1/2 percent from set point, within design conditions

E.	Maintain following temperatures within plus or minus 1-1/2 deg F

1.	Cooling coils: leaving air.

2.	Preheat coils: leaving air.

3.	Mixed air.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION NO.1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following Sections:

1.	CHILLED WATER SYSTEM.

2.	HOT WATER SYSTEM.

3.	FAN COIL SYSTEM.

4.	REFRIGERATION PLANT. (Centrifugal Units

5.	REFRIGERATION PLANT. (Absorption Units

6.	PACKAGED RECIPROCATING WATER CHILLERS. (Water Cooled

7.	CONDENSER WATER SYSTEM. (Packaged Cooling Towers

8.	AIR HANDLING SYSTEM EQUIPMENT.

9.	AIR DISTRIBUTION SYSTEM EQUIPMENT.

10.	HOT WATER SYSTEM.

11.	-----.

3)	REFERENCE STANDARDS

A.	Published specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for additional Reference Standards

4)	QUALITY ASSURANCE

A.	Refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for Quality Assurance requirements

5)	SUBMITTALS

A.	Submit complete "D" size diagrams of automatic control systems, one system per drawing showing piping, tubing, wiring, instruments with proper settings, locations of control devices

B.	Submit automatic control, diagrams with the following descriptions

1.	Sequence of operation.

2.	Sequence of interlocking.

3.	Operation of alarms.

4.	Controls schematic.

5.	System flow diagram.

6.	Ladder wiring diagram.

7.	Panel appearance detail with nameplate legend.

C.	Submit drawings and/or other documents for associated equipment including automatic, smoke dampers and combination fire and smoke dampers. Submit data on damper leakage rates, including operating power criteria. Submit data for sizing dampers.

D.	For elements sensing air temperature in ductwork or casings, submit details and proposed method of installation

6)	OPERATING INSTRUCTIONS:

A.	Printed instructions for operation, maintenance of each major item and component of automatic control system. Equipment shall be identified to enable adjustment and service. Show terminal identification and equipment designation.

B.	Provide actual operating instructions for typical periods, not necessarily consecutive and over a period of one year. Instruct Owner's personnel in operation and care of automatic control systems, for a minimum two hours per system

7)	CONTROL SEQUENCES OF OPERATION

NOTE: CONTROL SEQUENCE ARE GENERAL - EDIT/MODIFY TO SUIT PROJECT REQUIREMENTS

A.	General: Supply and install necessary sensing, controlling and controlled devices, piping, wiring and commissioning of automatic control systems, so as to meet requirements of control sequences hereinafter specified and as noted, in accordance with Contract Documents

B.	Operation of typical control safety devices:

1.	HOA supply fan switches: Safety devices shall be interlocked with "hand" and "automatic" positions in series with motor controller holding coil circuit. Interlocking with other fans and equipment of system shall be through "automatic" position only. "Hand" position shall be for maintenance only

2.	Return fan, transfer fan, exhaust fan HOA switches. (Interlocked with supply fans): Remote starting shall be from supply fan through "automatic" position only. "Hand" position shall be for maintenance operation only. Interlock through auxiliary contact of lead equipment motor controller

3.	Exhaust fans, such as general or toilet (operating independently): All safety devices shall be interlocked with "hand" and "automatic" positions in series with motor controller holding coil circuit. Remote starting shall be through "automatic" position only. "Hand" position shall be for maintenance operation only

4.	Safety devices for all systems, except as otherwise noted below

a.	One freeze protection thermostat per coil section, wired to stop supply fan, open return air damper and start return fan. Thermostat shall be automatic reset type

NOTE: CHECK LOCAL CODE FOR LOCATION OF FIRESTAT AND/OR SMOKE DETECTORS IN DUCTS. SMOKE DETECTORS ARE SUPPLIED BY ELECTRICAL COORDINATE WITH ELECTRICAL DEPARTMENT

b.	For systems under 15000 cfm, a duct mounted smoke detector of the ionization type located in the supply duct shall stop the supply fan and associated interlocked equipment should products of combustion be sensed

c.	For systems over 15000 cfm, a duct mounted smoke detector of the ionization type which is located in the supply and return duct shall stop the supply, return and associated interlocked equipment should products of combustion be sensed. Provide auxiliary contacts. Fire alarm system shall perform shutdown sequences

d.	Low static pressure limit switches, with manual reset shall stop associated supply fan when static pressure at supply fan inlet section, falls to its setting. Wiring of these devices shall be by this Contractor. Provide for all systems

e.	High static pressure limit switches, with manual reset, located at the fan discharge, shall stop supply fan and initiate a remote alarm when the static pressure reaches its setting. Provide for constant volume systems of 30,000 cfm and above and for all VAV systems

f.	Damper end switches shall prevent operation of fans until damper is fully open. Provide relays so it will not be necessary to hold start button until damper is fully open. Provide damper end switches as follows

(1)	On exhaust fan discharge air dampers.

(2)	On outside air and return air dampers.

(3)	On dampers, which if closed with fan running, could cause distribution system damage

(4)	On supply fan discharge smoke dampers.

(5)	On dampers as noted.

5.	For humidity control: space humidistat shall control reheat coil when lights are deactivated to maintain 60 percent RH or less

6.	For electric reheat control: space thermostat shall control the electric reheat coil (SRC via 0-135 ohm potentiometer) (via a pressure electric switch) to maintain its setting, unless otherwise described below

C.	Sequences (specific).

1.	Exhaust fans: Exhaust relief air discharge automatic damper shall open when fan is started, and close slowly, field adjustable to 60 seconds when stopped. Mount respective EP relay within 6 ft. of starter in control cabinet, or wire line voltage EP to motor side of disconnect where allowed by local codes. Damper shall be two position type with end switch. When fan is off, damper shall be closed. When fan is on damper shall be open.

2.	Variable volume systems: Maximum outside intake air dampers and discharge air dampers shall be modulating, fail-close type. Minimum outside intake air dampers, shall be two position type, fail-close type. Return air damper shall be modulating, fail-close type. Control valves, two-way modulating type cooling coil fail-close, heating coil fail-open. Supply fan inlet vanes shall be modulating type and shall fail-close to minimum open position

a.	When system is off, system outside air intake dampers and exhaust air damper shall be closed. Return air damper shall be closed. Heating coil shall be controlled by discharge controller. Supply fan inlet vanes shall be closed to minimum position

b.	When system is on, system components, as indicated, shall be interlocked with associated supply fan, to start with supply fan. System minimum outside intake damper return air damper and smoke damper shall be open

NOTE: AMEND PARAGRAPH AS REQUIRED.

(1)	Static pressure controller air monitoring devices in supply fan discharge, 2/3 distance in main supply duct, shall control variable inlet vanes on supply fan between minimum to maximum flow to maintain constant static pressure in supply fan discharge and control return air inlet vanes open from minimum to maximum

(2)	Controller sensing supply fan discharge temperature shall control cooling coil valve to maintain setpoint temperature

c.	Warm up cycle: At startup when fans are on and return air temperature is below design, outside air and exhaust dampers shall be closed, return air damper shall be opened, heating coil valve shall be open and VAV boxes should be open. When return air temperature assumes design temperatures, control system will return to normal operation

d.	Cool down cycle: At start-up when fans are on and return air temperature is above setting, outside air damper shall be open and if outside air enthalpy exceeds return air enthalpy, outside air damper shall close (to minimum poisition). When return air temperature assumes design temperature, control system shall automatically return to normal operating mode

e.	Night cycle: Night thermostat shall cycle fans on 100 percent recirculation to maintain lower space temperature

f.	Preheater control: Preheat coil hot water valve, shall be controlled by pneumatic duct-type submaster thermostat with averaging - type element. Automatic valve shall be provided at each coil section. Submaster thermostats reset by outdoor air master thermostat shall eliminate throttling range of thermostat on preheater coil leaving side

g.	Provide low temperature safety cutoff; one per each (cooling) (preheat)

NOTE: IF APPLICABLE ADD WARM UP, COOL DOWN, AND PRE-HEATER CONTRO

3.	Constant Volume (Multizone) Systems: Temperature control hot deck coil and cold deck coil discharge shall control heating coil valve and cooling coil valve to maintain its setting. When fan is off, outside air, exhaust air, return air and smoke dampers shall be closed; hot deck and cold coil valves shall be closed and preheat coil valves shall be open

a.	When fan start circuit is energized, smoke dampers, return air damper and minimum outside air dampers shall open. After dampers are fully open, damper switches shall start supply fan and the interlocked fans. Space thermostats shall control multizone dampers. Summer, winter operation shall be determined by temperature control in the outside air, switch at 68 deg F.

(1)	In summer, heating coil valve will be closed. Temperature controller in cold deck coil discharge shall control maximum outside air (return air and spill) dampers, preheat coil, and cooling coil valve in sequence.

(2)	Maximum outside air dampers shall close when outside air enthalpy exceeds return air enthalpy.

(3)	In winter when return air above 68 deg F, temperature control in hot deck coil discharge (reset by outside air temperature) shall control hot deck coil valve.

(4)	In winter when return air below 68 deg F, outside air and spill air damper closed and return air damper open. Hot deck temperature raised to 90 deg F when outside ambient temperature is 10 deg F

(5)	During unoccupied periods night thermostat will cycle fans on 100 percent recirculation to maintain lower space temperature

4.	Variable air volume terminal unit control: Room thermostat shall modulate VAV output of terminal unit to maintain room temperature

NOTE: CHECK WITH MECHANICAL DEPARTMENT.

a.	Provide main air to each box.

5.	Variable air volume with reheat coil control: Room thermostat shall modulate output of box and reheat coil valve in sequence to maintain room temperature

NOTE: CHECK WITH MECHANICAL DEPARTMENT.

a.	Provide main air to each box.

6.	Cafeteria/Kitchen system: When fan is off, outside air exhaust air dampers closed, return air damper closed, preheat coil valve(s) under control of coil discharge controllers (one per coil section), cooling coil valve closed, reheat coils valve closed.

a.	When fan start circuit is energized minimum outside air damper, return air damper open and smoke damper shall open. After dampers are open, dampers end switches shall start supply fan.

(1)	Room thermostat shall modulate its reheat coil valve and reset fan discharge submaster controller in sequence to maintain room temperature. Submaster fan discharge controller shall modulate cooling coil valve, preheat coil valves through preheat coil low limit controllers in sequence to maintain reset supply air temperature.

(2)	Room thermostat calling for most cooling shall reset fan discharge submaster controller.

(3)	Freezestat upstream of cooling coil shall stop supply fan and sound alarm on drop in temperature below its setting.

(4)	Night room thermostat will cycle supply fan on 100 percent recirculated air to maintain lowered space temperature.

(5)	Coordinate with automatic duct washer system; provide interlock contacts and wiring

7.	Heating, Ventilating units: When fans are off, outside air damper shall be closed, and return damper shall be open and heating coil shall be under control of the discharge low limit controllers. When fans are on, the outside damper, return damper and heating coil valve shall be controlled in sequence by a fan discharge controller, subject to a low limit controller in the heating coil discharge

8.	Fan Coil System: When fan is off, cooling coil valve shall be closed. When fan is on, thermostat in return air shall modulate in sequence hot water control valve, chilled water control valve to maintain desired temperature. When contactors for floor are energized through time clock, fan coil units for that floor are placed in operation

NOTE: FILL IN APPROPIATE TEMPERATURE BASED ON DESIGN.

a.	Fan coil unit - hot water system (HW): When the zone pumps are off, the system is off; hot water valves shall be closed and differential pressure control valve shall be open. When the zone pumps are started, the system is energized, hot water valves are controlled by thermostat with their element in hot water supply, reset by outside air. Outside air controller shall schedule hot water supply temperature from ---- deg F to ----- deg F when outside air varies from ---- deg F to ----- deg F. Zone differential pressure valve shall be controlled by its zone differential pressure regulator to maintain adjustable differential pressure

b.	Fan coil unit - chilled water (CHW): When the secondary pump is off, the primary CHW valve on interchange shall be closed. When secondary CHW pump is on, temperature controller in secondary CHW supply shall control primary CHW valve

c.	Converters: When pumps are off, steam valves shall be closed. When any pump is on, controller sensing supply water shall control converter steams valve to maintain its setting. A controller sensing supply water, reset by outside air temperature shall maintain supply water temperature. Differential pressure controller shall control bypass valve to maintain system differential pressure. Outside air thermostat shall automatically stop zone pumps above 65 deg F and start pumps below 63 deg F

9.	Controls of Elevator Hoistway Exhaust systems: Signal from Fire Detection System shall activate fan and shall stop fan when fire alarm signal is deactivated. Control damper in discharge duct interlocked with fan shall open when fan runs and close when fan is off

10.	Controls for Mechanical Room Exhaust Fans: On rise in temperature, room thermostat shall start fan. Each motorized intake and spill damper shall be interlocked to open when its respective fan runs, and close when that fan is off. Firestat set at 125 deg F shall stop fan. Firestat shall send signal to Fire Alarm system

NOTE: PROVISIONS FOR SMOKE DETECTION SHALL BE COORDINATED WITH THE ELECTRICAL DEPARTMENT AND AUTOMATION GROUP FOR ALL PROJECTS

11.	Duct-mounted smoke detection system.

a.	Supervised duct-mounted detectors will be provided under

WORK

(1)	Electrical work.

(2)	Automation and Monitoring System Work.

NOTE: NO REMOTE PANEL IS REQUIRED FOR THE PYROTRONICS MODEL CA-4. VERIFY THAT THE MODEL SPECIFIED IS CORRECT FOR THE PARTICULAR APPLICATION

(3)	HVAC work. Smoke detector shall be similar to Pyrotronics Model CA-4

WORK

b.	Under HVAC work: Install detectors with duct boxes and sampling tubes under manufacturer's supervision. Extend sampling tube across widest duct dimension and through opposite wall. Maintain clearance and accessibility to duct box and sampling tube end fitting. Provide and install automatic smoke dampers in all ducts penetrating building smoke barrier partitions. Assist in system testing

NOTE: COORDINATE THE FOLLOWING WITH ELECTRICAL DEPARTMENT AND AUTOMATION GROUP

c.	Control panel, wiring, testing, adjustments and wiring of automatic smoke dampers will be by others

d.	Install system in accordance with authorities having jurisdiction

NOTE: FOR NEW YORK CITY.

e.	System shall be BS&A approved for New York City.

f.	Assist in testing each detector for air velocity, detector firing and control panel and remote alarm and trouble indication

NOTE: IF SMOKE CONTROL IS USED SPECIFY A CENTRAL CONTROL PANEL.

12.	Smoke control.

a.	Stairwell pressurization: When smoke detectors in the return air ducts on any floor detect smoke, fans systems serving that floor and floors served by those systems will shut down and stair pressurization systems shall be activated. When the pressurization system is energized, the outside air damper shall open fully, closing the damper end switch which in turn shall start the supply fan. A differential pressure sensor (with indication at stairs) shall control the inlet vane damper to maintain its set point of plus, 0.04 inches, w.g. maximum. Provide manual override of fan operation from a Central Control Panel. Provide two position normally closed outside air damper. When system is off, outside air damper shall be closed, and fan vanes shall be in minimum flow position. Activation of smoke detector in top of stairs and at outside air intake shall stop fan and close intake air damper. Annunciate signal at the Central Control Panel and -----------

b.	Elevator lobby pressurization operation: When any smoke detector in return air ducts on any floor detects smoke, fan systems serving that floor and all floors served by those systems shall be shut down and, elevator lobby pressurization systems shall be activated. Provide manual override as directed. Provide two position normally closed outside air damper. When system is off, outside damper shall be closed. When fan start circuit is energized, outside air damper shall open. After damper is fully open, damper end switch shall start fan. Activation of smoke detector in top of elevator shaft or at outside air intake shall stop fan and close intake air damper

NOTE: REVISE CONTROL SEQUENCE BASED ON DESIGN.

13.	Emergency generators ventilating systems: When an emergency generator is started, supply fan starter circuit is energized, outside air damper shall open. When outside air damper is fully opened, damper end switch shall start supply fan

14.	Chilled water system differential pressure control: Chilled water by-pass valve shall be two way modulating type. When system is off, chilled water by-pass valve shall be open. When system is on, differential pressure controller shall modulate chilled water by-pass valve to maintain system pressure differential setpoint

NOTE: REVIEW SUB-PARAGRAPHS 16 THRU 21 WITH CUG.

15.	Hot water system differential pressure control: Hot water by-pass valve shall be two way modulating type. When system is off, hot water by-pass valve shall be open. When system is on, differential pressure controller shall modulate hot water by-pass valve to maintain system pressure differential setpoint

16.	Condenser water control: When condenser water pumps are off, cooling tower fans are off. When condenser water pumps are operating, temperature control in common condenser water supply leaving, shall start cooling tower fans in sequence to maintain its setting, 75 deg F, adjustable

17.	Refrigerant head pressure control: Condenser water (C.W.) leaving valve shall be two way modulating type. Pressure transmitter is provided under other Sections. When system is off, valve shall be closed. When system is on, C.W. leaving valve shall be controlled from refrigerant gas pressure transmitter to maintain refrigerant discharge gas pressure set-point, of double bundle refrigerant machines. When refrigerant system is running, differential pressure controller sensing across CW supply and return shall control by pass valve to maintain system differential setpoint

18.	Cooling tower winterization: Electric heater will be provided for winterized towers under other Sections. Provide heating contactor as required, and hand-off-automatic switch. Heating shall be controlled by thermostat when temperature drops below 35 deg F

19.	Basin level control: Provide on-off level sensing contacts. Make-up water valve shall be two-way. When system is off, make-up water valves shall be closed. When system is on, make-up water valve shall be controlled to maintain basin level

20.	Start-stop control of CW and CHW pumps: Pumps and their respective motorized discharge valves shall be interlocked. Upon starting a pump at the AMCS or its local pump control station, a time delay relay shall inhibit the valve from opening until such time as the pump has reached full speed. The valve shall then automatically open to its full wide open position. Upon the command to pump to stop, the valve shall automatically close and then the pump shall stop. The valve shall be capable of being set to any intermediate position by use of "CLOSE-STOP-OPEN" commands

21.	Chilled water make-up tank: A level controller shall control the make-up water solenoid valve to maintain tank level. High and low level alarm contacts shall be provided

8)	PNEUMATIC AIR PIPING FOR THE AUTOMATIC TEMPERATURE CONTROL SYSTEM

A.	Furnish air piping for the temperature 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 a temperature control system that divides the building into several areas of control which may be conveniently isolated for future maintenance and or repair

B.	Air distribution header:

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

NOTE: CHOOSE OPTION 1 OR 2.

ISTR

2.	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. A pressure reducing station at a suitable location shall reduce the main pressure to 20 psig

3.	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

ISTR

C.	PRV station:

NOTE: CHOOSE SAME OPTIONS (1 OR 2) AS CHOSEN ABOVE.

RV

1.	High pressure PRV station: At each remote location, provide a PRV station consisting of 4 pressure reducing valves (piped in parallel) and valved so one set is a standby. In the common PRV discharge, provide a pop safety valve set at 30 psig

2.	Low pressure PRV station: A pressure reducing station, located between the air storage tanks and the refrigerated air dryer, shall consist of parallel two stage reducing stations with valves so either set could be valved off for maintenance and a pop safety valve (set at 30 psig ) in the common PRV discharge

RV

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

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Automatic Control Systems: Honeywell, Johnson Controls and Powers

B.	Smoke and Halon dampers: Air Balance, Airstream, Arrow Louver, Honeywell, Penn Ventilator Co. and Ruskin

C.	Combination fire and smoke dampers: Ruskin.

D.	Air flow and synchronization controls: Air Monitor Co

2)	TUBING

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

B.	Exposed tubing shall be copper or plastic in EMT. In concealed but accessible locations, tubing shall be copper or plastic in EMT or jacketed bundled tubing. In concealed inaccessible areas, tubing shall be copper, plastic in EMT or multitube bundle with 30 percent spare capacity. Thermostat mains and branches, when run vertical in a wall, may be copper or plastic

C.	Identification of tubes: The individual tubes shall 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

3)	COMPRESSED AIR

A.	Two compressors oil-less type with the capacity of each compressor sufficient to supply required air volume when operating maximum 1/3 of time. Provide motors with minimum horsepower required. Provide one or more air storage tanks with total capacity of 15 minutes without compressor operation. Tanks shall be steel, hot-dipped galvanized after fabrication. Tanks shall be suitable for working pressure of minimum 200 psig, constructed and stamped in accordance with ASME Code for Unfired Vessels with valved drain connection and automatic trap

B.	Accessories: Selector switch for manually changing starting sequence of compressors, lead-lag control. First compressor shall operate between 90 and 70 psig (adjustable). Second compressor shall automatically start if tank pressure falls below 76 psig. Accessories shall be automatic traps on compressed air storage tanks, air dryers piped to drain, high-efficiency prefilters, after filters for 99 percent oil and 0.3 micron solid particle removal, intake silencers, relief valves, pressure switches and gauges and refrigeration type air dryer to maintain 38 deg F dewpoint, drains, bypasses, shutoff valves and vibration isolators for compressors and piping. Vibration isolators shall be in accordance with Section Vibration Isolation

NOTE: CHECK WITH MECHANICAL DEPARTMENT.

4)	INSTRUMENTATION

A.	Except as noted, provide control instruments, thermostats, humidistats, pressure regulators, as follows

1.	Fully proportioning.

2.	Adjustable sensitivity.

3.	Range adjustment.

4.	Pilot bleed relay type or bleed type with individual nonbleed relays

B.	Provide remote bulb mounting, for ducts, pipes and tank. Ducts and casings shall be flanged. Pipes under 4 inches and tanks shall be brass with separable sockets. Pipes over 4 inches shall be stainless steel. For insulated work, provide flanges and sockets extension neck type to finish flush with insulation surface

C.	Provide average type elements, sensing air temperature in ductwork or casings. Sensing length or number of elements to measure air temperature throughout entire cross section of duct or casings

D.	Except as noted provide pneumatic type thermostats. Room type (exposed) shall be key adjusted,without thermometer and plated finish, as approved. Duct and immersion type shall be with remote transmission

E.	Except as noted provide pneumatic type humidistats. Humidistat shall be key adjusted and plated finish (as approved) with adjustable throttling range. Room type shall be recessed adjustable and plated finish (as approved). Provide duct type with remote transmission capable of returning to original calibration after being subject to saturated air

F.	Provide remote transmission type pressure controllers. Provide relay controllers with throttling range adjustable to meet minimum requirements of control specified

G.	Provide transmitters: Temperature and pressure transmitters shall have a accuracy of plus or minus 1 percent of sacle. Humidity transmitter shall have a accuracy of plus or minus 2 percent of scale referenced to common gauge of 1/2 percent of scale. Transmitter spans operating point at midscale shall be as follows

1.	Room temperature: 50 deg F.

2.	Chilled water, condenser water temperature: 100 deg F.

3.	Hot water temperature: 200 deg F.

4.	Duct air temperature: 100 deg F or 200 deg F as required by maximum duct temperature

5.	Dew-point temperature: 50 deg F.

6.	Room air and return air humidity: 50 percent RH.

7.	Outside air shall be 100 deg F.

H.	Provide indicators with minimum 3-1/2 inch diameter dial, flush-mounted on local control cabinets. Cabinet mounted controllers shall indicate temperature at entering and leaving sides of heating and cooling coil assemblies and return line of each water system or zone where thermostat is furnished in supply line. Provide temperature indicators on return air ducts,outdoor air north, mixed air and fan discharge

I.	Provide cabinet-mounted air pressure gauges with minimum 2 inch diameter. Elsewhere, minimum 1-1/2 inch diameter. Provide as required to indicate changes in air pressure. Gauges are not required at room thermostats and room humidistats

NOTE: CHOOSE EITHER PARAGRAPH 2.05 A THROUGH D OR E.

5)	AIRFLOW MEASURING CONTROL UNITS SPECIFICATION

A.	Scope of work: The ACS Contractor shall supply and the HVAC Contractor shall install where recommended by the manufacturer air volume control units of the indicated sizes, configurations, and capacities

B.	Basic airflow measuring control functions: The air flow control unit systems shall be capable of performing the basic control functions of constant volume control, variable-constant volume control, variable air volume synchronization control and volumatic synchronization control, either in single or multiple operation as required

C.	Airflow measuring system performance:

1.	The airflow measuring system controller with integral transmitter, square root extractor, and scaling multiplier shall be capable of issuing a linear-to-air volume, (3 to 15 psig) pneumatic control signal and controlling a flow rate by means of a motorized volume damper within the following minimum performance and application criteria

a.	Operating Range: 550 fpm, 0.019 inch wg to 3000 fpm, 0.56 inch wg

b.	Control Accuracy shall be plus or minus of setpoint at mid-span

c.	Proportional band shall be 1 to 20 percent adjustable

d.	Dead band and hysteresis (combined).

e.	Multiplier: adjustable scaling factor, 0.5 to

f.	Repeatability shall be within 0.6 percent of span.

g.	Response shall be less than 10 seconds for full range set change

2.	The airflow measuring control unit shall control the airflow rate at a constant volume without air flutter of fluctuation within a maximum variation of four percent of the air volume setpoint regardless of the magnitude, frequency, or speed of system static changes

D.	Installation, control calibration, start-up, and service: All external interconnecting control or pressure signal tubing of the proper size and an ample supply of clean, dry control air at a minimum pressure of 20 psig shall be furnished by the ACS contractor

1.	The airflow measuring control unit manufacturer, with ACS Contractor shall provide all necessary factory and/or field labor for complete calibration and adjustment of the airflow control and shall be responsible for setting all control setpoints and operating sequences to produce the following overall unit system performance. Constant air volume control shall be 3 percent of air volume setpoint. Volumetric synchronization of supply and return duct airflow shall be rated within 6 percent of design air volume

2.	In conjunction with the system start-up, the ACS Contractor shall instruct the Owner's personnel in the proper operation of the air volume control unit

3.	The ACS Contractor shall guarantee the proper operation of the system and furnish all required service for one full year from the date of system acceptance by the project engineer

4.	ACS Contractor shall furnish measuring stations. Installation shall be performed by the trade having jurisdiction over same

E.	Static pressure control: Static pressure sensor shall be located 2/3 downstream in the main supply duct. Sensor shall be similar to Dwyer Static Probe. Mark ceilings at sensor location with colored button or other device as approved on shop drawings

6)	LOCAL CONTROL CABINETS

A.	Provide free tanding or front access wall-mounted type cabinets with maximum 3 ft wide doors, and provided with prewired canopy lighting fixture, full length across top of cabinet with switch in cabinet. Provide framed, plastic-encased control diagram of respective system secured to cabinet. Screw on nameplate under each item of equipment

1.	Provide control cabinet for each air-conditioning system, heating system, ventilation system, water system, steam system and other controlled systems

2.	Except as noted locate in system local control cabinets, switches and relays, electric pneumatic (EP) relay for each motor actuating pneumatic controls, pneumatic electric (PE) relay for each motor actuated by pneumatic controls and controllers

3.	Provide gauges, indicators for controllers and switches flush-mouned on front of cabinet door, visible and operable with door closed

4.	Other requirements: Provide wiring and tubing connections inside cabinet. Components requiring external field wiring connections shall be prewired in cabinet to numbered terminal strips. Live terminals operating at less than 50 volts shall be separately enclosed

5.	Local smoke purge panel: Provide red laminated plate with white engraved lettering with two position switch for each fan controlled in panel, mounted in linear grouping and audible alarm with silencer button and red indication lamp for any switch in purge condition. Engrave plate with title "Emergency Smoke Purge System". Engrave each switch with "normal", "purge" and fan identification number

7)	AUTOMATIC DAMPERS

A.	Dampers shall be factory fabricated by automatic control system manufacturer. Modulating dampers, shall be opposed-blade type. Galvanized steel blades shall be minimum 4 inches and maximum 8 inches wide. At points of contact, interlocking edges of compressible seals shall be selected for temperature of minus 40 to 180 F at specified leakage rate. Leakage when closed shall be guaranteed less than 10 cfm per square ft at 4 inches wg static pressure

B.	Provide factory mounted operators, with sufficient power to limit leakage to specified rate. Operating linkages shall be factory-assembled and capable of withstanding load equal to twice maximum operating force of damper operator, without deflection. Dampers free area shall be sized by automatic control system manufacturer. Provide necessary number of blankoff plates between damper leaves to obtain required free area. Blankoff plates shall be equally spaced with blankoff plate between two pairs of operating damper leaves

C.	Damper frame shall be galvanized bar or channel steel with corner bracing for dampers above 4 sq ft. Dampers shall be full size of duct or opening in which installed. Trunions shall be steel. Bearings shall be bronze sleeve, nylon or ball bearings with thrust bearings for vertically mounted dampers and maximum spacing of 48 inches. Steel parts shall be zinc-coated or painted with two coats rust-inhibitive paint

8)	SMOKE AND HALON DAMPERS

A.	Smoke and halon dampers shall be single blade or parallel multi-blade, louver type dampers for automatic operation with minimum 2 inches wide x 1/8 inch thickness galvanized steel, bar or channel frames with corner bracing over 4 sq ft. Blades shall be minimum No. 16 USSG galvanized steel, edges crimped to interlock in closed position. Closed position guaranteed leakage rate shall be maximum 10 cfm per square ft at 4 inches wg differential static pressure. Pivot rods shall be steel with a minimum 1/2 inch diameter, 6 inches long. Maximum length shall be 48 inches. Maximum width shall be 8 inches. Dampers shall be suitable for closure against duct operating pressures of 6 inches water gauge and velocities of 4000 fpm

B.	Dampers shall be full size of duct or opening in which installed

C.	Bronze sleeve or steel ball type bearings with thrust bearings for vertically mounted and maximum space of 48 inches

D.	Factory assembled operating linkage shall be capable of withstanding load equal to twice maximum operating force of damper operator without deflection. Operators shall be pneumatic or electric, with sufficient power to limit leakage to specified rate. Factory mounted operators complete with position indicaters 2-pole damper position switch, thermal overload, toggle disconnect switch and junction box

E.	Steel parts shall be galvanized or finished with two coats of rust-inhibitive paint. Locate dampers in supply air connections to air handling equipment and in ducts and openings through smoke partitions. Electrical wiring to damper operator from smoke detector control panel will be provided under other Sections

9)	AUTOMATIC VALVES

A.	Valves shall be suitable for pressure ratings as noted for respective system. Valves two (2) inches and smaller shall be screwed and bodies and internal parts shall be bronze stainless steel or other approved corrosion resistant metal, except as noted. Valves 2-1/2 inch and larger shall be flanged with cast iron or cast steel bodies, seats and parts exposed to fluid shall be stainless steel or noted approved corrision resistant metal, except as noted

B.	Provide valves with minimum 1-1/2 inch diameter pressure gauges. Modulating valves in Mechanical Equipment Rooms, provide with mechanical direct reading movement indicators

C.	Valve operators shall be capable of tight-closing against system pressure. Water valves shall be single-seated for dead-end service. Steam valves shall be single-seated and provide stainless steel trim in steam piping 20 psig or above

D.	Valve sizing shall be by automatic control system manufacturer for fully modulating operation and for the required capacities. Two (2) position valves shall be line size except as noted. Line size valves shall be with properly sized internals. For valves smaller than line size, provide reduction pieces for installation in noted line size. For water valves, minimum pressure drop shall be equal to pressure drop of coil or exchanger and maximum pressure drop shall be 5 psig. Relief and bypass valves shall be sized according to pressure available and where load exceeds capacity of 2-1/2 inches control valve, provide two valves and each valve shall control approximately 50 percent of load.

10)	POSITIVE POSITIONING RELAYS

A.	Provide for modulating valves and dampers operating in sequence, adjustable starting and operating position

11)	SERVICE KIT

A.	Testing equipment shall be calibrated air pressure gauges. Tools shall be screwdriver and wrenches

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Wiring and conduit: In finish areas, provide wiring and conduit concealed behind finished surfaces. In mechanical equipment rooms and service rooms, provide wiring and conduit exposed. Run wiring and conduit parallel to building construction. For supports, provide straps, cleats or hangers. Wire or tape support will not be permitted

B.	Instrumentation: Locations shall be the responsibility of control system manufacturer. Elements sensing air temperature in ductwork or casings, including low temperature safety cutoff thermostats shall be spread out in sine-curve fashion and supported by stainless steel grid or multiple bulb holders. Room type thermostats, shall be wall mounted, 5 ft - 6 inches above finished floor and 7 ft - 0 inch in service corridors where subject to damage by Carts, Townmotors etc. Locate adjustment knobs directly behind or below access doors. Room humidistats shall be wall mounted, 5 ft - 6 inches above finished floor and shall be the same physical appearance as room thermostat. High-limit humidistats shall be duct mounted. Pressure controllers shall be mounted on local control cabinet with associated pneumatic pressure indicators

C.	Local control cabinets: Provide adjacent to system served and mounting height shall be centerline 5 ft - 6 inches above finished floor except bottom shall be minimum 30 inches above floor and top shall be maximum 7 ft - 0 inch above floor

D.	Automatic dampers: Minimum outside air damper sections shall be located to provide maximum blending with return air and minimum stratification during cold weather

E.	Wiring: Provide complete electric wiring connected to electronic or electric control sensing devices and to control system devices. Wiring in control cabinets shall be connected to terminal strips. Wires shall be labeled at ends to show location of opposite ends. Points of terminated strips permanently labeled shall show instrument or item served. Wiring shall be in accordance with applicable codes. Provide wiring for control devices, monitoring devices, and interlocks as required for a complete system. Coordinate with Plumbing, Electrical and HVAC Specifications for devices requiring wiring under this Section

F.	Tubing: All tubing shall be supported at regular intervals to prevent sagging. 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 shall be installed in between to absorb vibration. Whenever copper tubing crosses a flexible connection, a short piece of plastic shall be installed in between to absorb vibration. The final connection to move control equipment such as dampers actuators, shall be made via a 12 inch section of plastic tube. Support shall be by means of non ferrous clamps or hangers fastened to the building structure. Plastic tubing shall not be installed within an enclosure containing a heating element, in ceilings used as a return air plenum, adjacent to hot pipes or lights, any surface whose temperature exceeds 125 deg F. and in service in excess of 25 psig. All copper tubing containing pressures over 25 psig, shall have solder type fittings. All other fittings shall be compression type. Plastic tubing shall be joined with either barbed or compression type fittings. 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 metalic raceways or EMT or PVC pipe

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

2)	TESTS

A.	Test air piping system with 25 psig for 24 hours during which time air pressure drop shall not exceed 10 psig

B.	Adjustments of control systems and final test: Automatic control systems shall be adjusted and placed in service by qualified representatives of manufacturer. Control systems shall be tested in presence of Owner and Architect and/or Engineer to demonstrate satisfactory operation