REFRIGERATION PLANT (ELECTRIC CENTRIFUGAL MACHINES)

NOTE: FINAL COPY: AUGUST, 1988.

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes providing all 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.	Refrigeration units.

2.	Remote pump-down system including piping, condensing unit and receiver (if required)

3.	Piping connections, including chilled water, condenser water and miscellaneous piping as required

4.	Refrigerant relief system.

5.	Refrigeration plant accessories.

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. COORDINATE THESE OTHER SECTIONS TO INCLUDE THE REQUIREMENTS OF THE REFRIGERATION PLANT

B.	Related work is specified in the following Sections:

1.	Piping,

2.	Chilled Water System

3.	Condenser Water System

4.	Insulation

5.	Motors

6.	Motor Controllers

7.	Automatic Control Systems

8.	Vibration Isolation

9.	Balancing Air and Water Systems.

3)	APPLICABLE CODES AND REFERENCE STANDARDS

A.	ASNRAE STD. 15, "Safety Code for Mechanical Refrigeration".

4)	QUALITY ASSURANCE

A.	Noise level in refrigeration plant shall not exceed 90 DBA 5 ft in any direction from refrigeration machine. Provide any accessories and work necessary to accomplish this under all operating conditions, without additional cost to the Owner. Any field work to accomplish this shall be submitted for approval by Manufacturer and Architect

NOTE: APPLICABLE WHEN NO "VIBRATION ISOLATION" SECTION EXISTS.

1.	Refrigeration units, including vibration isolators, shall be guaranteed to prevent transmission of vibration to building. Vibration conditions considered objectionable, in the opinion of the Architect, shall be corrected by the Contractor at his expense and submitted for review

5)	SUBMITTALS

A.	Refrigeration units: Overall description, unit equipment, dimensioned drawings showing all connection points and required clearances for maintenance and repair, piping arrangement, electric sercive requirements, motor controllers, accessories, control panel, description of controls, safety controls and control wiring diagrams. Performance data shall be certified per ARI standard 550 and shall include leaving temperatures and pressure drops for CHW & CW based on compressor power and scheduled flow rates and entering conditions

B.	Detailed and dimensioned shop drawings for foundations

C.	Remote pump-down unit (if required), including condensing unit, receiver, piping, controls and electric service requirements

D.	Refrigeration Plant Accessories.

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Refrigeration units: Trane, York and Carrier.

2)	REFRIGERATION UNITS

NOTE: DELETE REFERENCE TO HEAT RECOVERY IF NOT APPLICABLE. MODIFY AS REQUIRED IF UNIT IS NOT SHIPPED AS A PACKAGE OR IF SOME DISASSEMBLY & RE-ASSEMBLY ARE REQUIRED FOR RIGGING

A.	General: Electric drive centrifugal type for heat recovery application, with all components necessary for a complete and satisfactory installation, and with all accessories as noted herein. Note that the terms "Refrigeration Units", "Refrigeration Machines", "Chillers", "Heat Recovery Chillers", etc., are synonymous, and refer to the equipment specified here. Refrigeration machines shall

1.	Be completely factory assembled, piped and wired, and shipped as a packaged assembly requiring no field assembly except as noted

2.	Be mounted on a structural steel base, and have all exposed surfaces finished with gray primer or equal

3.	Meet or exceed the performance data indicated on the drawings.

4.	Be suitable for installation, operation, maintenance and repair in the space conditions indicated on the drawings. All components shall be fully serviceable in place, and shall have lifting lugs as required.

B.	Compressors: centrifugal type, of required stages with cast aluminum, or equivalent, impeller and motor dynamically and statically balanced after fabrication and tested to a minimum 20 percent overspeed. Vibration shall not exceed 1.0 mil at the compressor housing. Operating speed shall be below the first critical speed. Casing shall be close-grain cast iron or equivalent material

NOTE: COORDINATE WITH ELECTRICAL DEPT. TO PUT ON EMERGENCY.

1.	Lubrication system: Forced circulation type, completely piped and wired with all components necessary to assure positive oil supply on start-up, normal operation, shut-down, and power failure, including oil pump, cooler, filter, pressure gauge, thermometer, sight ports, heater, motor controller and controls.

2.	Flash gases shall be removed from liquid cooler at one or more intermediate stages of multi-stage compressors.

3.	Automatic capacity control: variable inlet guide vanes shall modulate capacity from 10 to 100 percent per ARI standard 550 without hot gas bypass. Guide vanes shall be air foil shaped, stainless steel or nonferrous alloy, supported by high-quality, heat-treated stainless steel or nonferrous alloy shafts. Positive seal shall be used at points where vane operating mechanism passes thru the compressor casing. Provide external electric valve operator and linkage

C.	Provide drive train accossories (e.g., speed increaser gears & couplings) as required. Accessories shall have sufficient capacity to transmit maximum compressor load under all operating conditions with vibration not to exceed 1 mil

1.	Gears: Designed and manufactured in accordance with the latest American Gear Manufacturers Association (AGMA) standards, helical type continuously lubricated with filtered oil with pressure-lubricated bearings. Temperature rise shall not exceed 70 deg F above ambient at full load

2.	Couplings: Rigid type with coupling guards.

D.	Motors: Nominal 3600 rpm squirrel Cage induction type, hermetic (refrigerant cooled) or open drip-proof (air cooled) type, conforming to the requirements of specification section "Motors".

1.	Motors shall be suitable for use with specified motor controllers, fully serviceable without disassembling compressors, suitable for on-off cycling at 30-minute intervals continuously without damage, sized so that full load operating amps do not exceed nameplate amps, and guaranteed by manufacturer for continuous operation at maximum brake horsepower when driving the refrigeration compressor

2.	Shafts shall be designed for first critical speed well above maximum operating speed. Shaft, bearings and frame shall be suitable for supporting compressor impeller if required. Bearings shall be fully accessible for servicing. Provide motor lifting lugs.

E.	Evaporators: Shell and tube type with welded steel shells, steel tube sheets welded to shells, cast iron or steel water boxes bolted to tube sheets, copper tubes rolled into tube sheets, and intermediate tube sheets not less than 5 ft on centers to support tubes and prevent vibration. Tubes shall not have external fins at tube sheets and intermediate tube sheets, and shall be individually removable without affecting tube sheets or causing leakage at adjacent tubes

1.	Refrigerant side: Flooded design constructed in accordance with the ASME code for unfired pressure vessels and tested at 1.5 times the design working pressure but not less than 45 psig. Where the design pressure exceeds 15 psi, the refrigerant side of the evaporator shall be ASME stamped. Provide baffles to uniformly distribute liquid refrigerant, non-ferrous eliminators to prevent liquid refrigerant from entering compressor, refrigerant charging connection, rupture disc and sight glass to indicate liquid level.

OTE: SELECT 0.28 WALL THICKNESS FOR STANDARD PROJECTS. SELECT 0.35" WALL THICKNESS IF OWNER REQUEST, IF FREQUENT ACID CLEANING IS ANTICIPATED, OR IF CHILLED WATER WORKING PRESSURE EXCEEDS 350 PSIG. SELECT 150 PSIG OR 300 PSIG WATER-SIDE WORKING PRESSURE AS REQUIRED. FOR HIGHER PRESSURE CHECK MANUFACTURERS FOR AVAILABILITY AND COST

2.	Water side: Designed and constructed in accordance with ASME code for unfired pressure vessels for _____ psig design pressure. If water volume exceeds 120 gallons (including tubes and water boxes), and pressure exceed 15 psig, water side shall be ASME stamped. Provide minimum _______ inch tube wall thickness, minimum 1/2 inch inside diameter, maximum 10 ft per second water velocity in tubes, and water boxes with drain and vent connections and with flanged connections for main piping

NOTE: IF RIVER WATER, WELL WATER OR OTHER WATER SOURCE IS USED FOR CONDENSER WATER OTHER THAN COOLING TOWER WATER WITH WATER TREATMENT, CONTRUCTION SHOULD BE CHECKED WITH WATER TREATMENT CONSULTANT

F.	Condensers: Similar to evaporators specified above except as follows:

1.	Provide liquid subcooling, connections for purge and recovery unit, and baffles to prevent direct impingement of refrigerant gases on tubes and to uniformly distribute gas refrigerant over length of condenser

2.	Tube wall thickness shall be minimum ______ inch. Water-side pressure rating shall be ______ psig

NOTE: HEAT RECOVERY CONDENSERS. THIS TYPE OF HEAT RECOVERY MACHINE HAS PARALLEL CONDENSERS. THIS DOES NOT DESCRIBE THE 2-STAGE CARRIER HR UNIT

G.	Where drawings call for heat recovery refrigeration units, provide auxiliary condenser or double bundle condenser in parallel with and similar to tower condenser specified above. Provide all necessary components to balance and control refrigerant

1.	Tube wall thickness shall be minimum ----- inch water-side pressure rating shall be ------ psig

NOTE: COORDINATE WITH ELECTRICAL DEPT. FOR MOTOR CONTROLLER TYPE AND VOLTAGE

H.	Compressor motor controllers:

NOTE: FOR COMPRESSOR MOTOR CONTROLLERS, PLEASE CHOOSE OPTION A, OPTION B, OPTION C, OR OPTION D AS APPLICABLE. COORDINATE WITH ELECTRICAL DEPARTMENT

NOTE: OPTION A-480V OR 208V.

1.	Magnetic star-delta, closed transition type with circuit breaker, suitable for starting compressor motor intermittently at 30 minute intervals continuously without damage to controller. Controllers shall be as manufactured by Cutter-Hammer, General Electric or Furnas and shall include the following

a.	120 volt control transformer for starter and unit control panel with fuse and ground connection on low voltage side, 2 NO and 2 NC auxiliary dry contacts, time delay relay to delay restart on normal power failure for units connected to emergency power supply, and disconnects with terminal blocks for service to any unit mounted equipment requiring power

b.	Overload protection in each phase, with manual reset magnetic relay, ground fault protection, phase unbalance protection, phase reversal protection, time delay undervoltage protection, separate volt meter and ammeter in each phase, red indicating light and controls for definite time limit acceleration

c.	NEMA Type 1 enclosure suitable for pad mounting, with padlock attachment, all fuses, gauges resets and lights mounted on front panel

NOTE: OPTION B - 4160 VOLT.

NOTE: (FULL VOLTAGE) (REDUCED VOLTAGE), (NONEVERSING) (REVERSING). FOR REDUCED VOLTAGE SPECIFY AUTOTRANSFORMER OR STAR DELTA

NOTE: SQUIRREL-CAGE, BRUSH SYNCHRONOUS, BRUSHLESS SYNCHRONOUS.

2.	--------- volt, 3 phase, -------- hz with the following:

ONT

a.	Magnetic air-break line contactor, draw out type rated 400 amperes, 5000 volts

b.	Magnetic air-break line contactor rated 700 amperes

ONT

NOTE: 200,000 KVA AT 2400 VOLTS, 360,000 KVA FOR 4000 VOLTS, 400,000 KVA AT 4800 VOLTS FOR 400 AMP CONTACTOR

CURR

c.	Current limiting fuses that give the controller an interrupting capacity of ------- KVA symmetrical at ------- volts

NOTE: 260,000 KVA AT 2400 VOLTS, 470,000 KVA FOR 4000 VOLTS, 520,000 KVA AT 4800 VOLTS FOR 700 AMP CONTACTOR

d.	Current limiting fuses that give the controller an interrupting capacity of ------- KVA symmetrical at ------- volts.

CURR

e.	Free standing type in NEMA 1 enclosure and include the following

NOTE: 1000 AMP OR 2000 AMP.

(1)	Bus: -------amp. Provide medium voltage terminals.

(2)	Enclosure compartment into low-voltage control compartment with separate door, high-voltage control compartment with separate door, AC bus compartment and cable-entrance compartment

(3)	Isolation of controller by externally operated draw out stabs with shutter mechanism. Isolating device to open the secondary of power transformer

(4)	Interlocks to prevent inadvertent operation of isolating mechanism under load, opening high voltage compartment door with isolating starter and closing line contactor with door open

(5)	Three-pole, ambient-compensated thermal-overload relay, hand-reset, instantaneous undervoltage protection, control power transformer, current transformers and potential transformers, control circuit fuses, H-O-A switch

(6)	Meters and instruments including ammeter with selector switch, voltmeter with selector switch, elapsed type meter and power factor meter

(7)	Protective devices including ground fault relay, over temperature relay and open phase and phase unbalance relay

NOTE: INCLUDE FOR MOTORS OVER 1500 HP.

(8)	Include differential relay for motors over 1500 HP

NOTE: INCLUDE FOR SYNCHRONOUS MOTORS. TAPPED - TRANSFORMER DIODE, ADJUSTABLE SCR, ADJUSTABLE SCR WITH POWER-FACTOR REGULATION. PROVIDE SEPARATE 480 VOLT AC SOURCE

f.	Field supply: static type, including line AC ammeter, field AC ammeter, field starting and discharge resistor, magnetic field contactor and solid state circuit components for precision angle field application and load angle field removal and squirrel cage protection for fully automatic operation

(1)	General Electric, Westinghouse or Square D.

NOTE: OPTION C - SOLID STATE STARTER.

3.	Reduced voltage solid state starter, factory mounted and wired on the unit with current and overload protection, factory adjusted and with smooth acceleration without current transitions or transients. Motor controller shall include

a.	Protective devices shall including three leg sensing electronic overloads with indicating lights and reset button, phase rotation protection circuit and indicating light, signal phase failure protection circuit and indicating light and high temperature safety protection system with indicating light and reset button

b.	Modular construction with complete accessibility to all components

c.	Accessories including lock and key, 3-phase dual scale ammeter with 4-position switch, 3 phase voltmeter with 4 position switch, control transformer for starter and unit control panel, elapsed time meter and electrical lugs for incoming copper power connections

NOTE: OPTION D 480V OR 208V VARIABLE SPEED DRIVE.

4.	Variable speed type controller capable of converting incoming 3 phase power to an adjustable voltage DC and then to adjustable frequency AC, via a 3 phase inverter, including the following

a.	Isolated power and control circuits. adjustable current limiting circuitry to provide soft-starting of motor, linear acceleration and deceleration rates independently adjustable from 1.2 to 152.4 Hz/sec, minimum 97% efficiency and minimum 99% full load power factor. Continuous current rating shall be 100 percent of motor full load amps. Intermittent rating shall be 150 percent for one minute

b.	Circuitry to initiate an orderly shutdown of the inverter for protection against incorrect phase sequence, loss of an input AC phase, over-voltage (DC link, AC power, control power), over frequency, undervoltage of DC bus or control power, running over current, instantaneous over current of 175 - 200 percent, transistor commutation over current, surge voltage and ground fault

START

c.	NEMA I enclosure, dead back construction, disconnect, current limiting line fuses, 115 v controls with control transformer for motor controller and unit control panel, 4-20 ma or binary coded decimal external signal and manual reset overload potection in each phase

d.	The following accessories mounted and wired onto controller enclosure door: start-stop pushbutton, auto/manual selector switch, manual speed potentiometer, 0-200 Hz range, speed indicator, red running light, motor overload light, inverter failure light and manual reset overload pushbutton

e.	Motor controller shall conform to IEEE standard 519 and be suitable for the service voltage +10% or 5%

f.	Emerson, Allen Bradley, or Eaton.

I.	Purge and recovery units: To remove air, water and water vapor from condenser and return refrigerant to system. Completely factory assembled, piped and wired with all components necessary for fully automatic operation. All non-corrodible materials, condenser suitable for use with chilled water, condenser water, or refrigerant, sight glass and water blow-down valve

J.	Pump-down units: provide pump-down condensing units and receivers for refrigeration units utilizing high pressure refrigerants (refrigerants which have a positive pressure at 75 deg F). Pump-down units shall be factory assembled piped and wired with all components necessary for fully automatic operation after manual start, including compressors, condensing unit, refrigerant receiver, controls and piping. All materials shall be corrosion-resistant.

1.	Controls shall include automatic reset, high and low-pressure cutout switches and manual-reset oil failure switch

NOTE: COORDINATE WATER CONNECTION WITH PLUMBING DEPT.

2.	Condenser shall be a shell and coil type, suitable for use with city water or air cooled with fan and motor

3.	Provide a receiver with a minimum capacity of 1.20 times the total charge of refrigeration unit, constructed for the required working pressure in accordance with the ASME Code and so stamped. The receiver shall be provided with gauge glass, valved refrigerant drain, vent valve, compound gauge and cock and relief valves

NOTE: SELECT APPROPRIATE OPTION FOR UNIT-MOUNTED CONTROL PANEL. OPTION 1 IS A STANDARD HARD WIRED PANEL. OPTION 2 IS A PANEL WITH A MICROPROCESSOR

ANEL

K.	Control panel: Factory installed, wired and tested control system to continuously monitor and automatically control all aspects of refrigeration machine operation

1.	Safety controls: Automatic unit shutdown, pilot lamp, and manual reset switch for the following: Low evaporator refrigerant pressure or temperature, high condenser refrigerant pressure, low oil pressure, high oil temperature, high motor current, high motor temperature and loss of flow through evaporator, condenser or heat recovery condenser

a.	Provide means to prevent damage to motor or starter due to excessive cycling of machine.

2.	Monitoring: Gauges for condenser pressure, evaporator pressure and lubricating oil pressure (all gauges shall be provided with shut-off or valves), and elapsed time meter

a.	Provide pilot lamps to indicate minimum flow through evaporator, condenser and heat recovery condenser

3.	Control center shall be wired, assembled and adjusted at the factory

L.	Control center.

1.	Each unit shall be provided with a complete micro-computer control center with locked enclosure and shall be factory mounted, wired and tested and provided with 40 character alpha-numeric display indicating all system parameters and programming of essential set points as follows

a.	Leaving chilled water temperature.

b.	Percent full load current limit.

c.	Pull down demand limiting (40 to 100 percent).

d.	Remote reset temperature range.

5

(A)	day timeclock (chillers, pumps, towers).

2.	Control capabilities.

a.	Modes of operation shall include a four position key switch to provide choice of independent control modes of operation for local, program, remote and service

(1)	Terminal block shall accept a one to eleven second pulse with a signal for continuous remote reset of leaving chilled water temperature and power demand limiting

(2)	Remote features: field interlocks shall allow remote differentiation between cycling and remote shutdown

(3)	Separate contact closure shall indicate chiller will start (all safeties and cycling devices satisfied) when a remote signal is received

(4)	Provide capability for remote start stop control of chillers

(5)	Provide input terminals, wiring and controller for remote chilled water set point control by 4-20ma signal

(6)	Provide hand-off automatic selector switch wiring and terminals for remote start/stop of chillers

(7)	Controls shall provide adjustable rate at which chiller is allowed to load from one minute to four hours

3.	Provide safety controls with automatic unit shutdown for low oil pressure, high and low refrigerant pressure, low chilled water temperature, high oil temperature and starter faults

a.	Unit shall not start without minimum flow through evaporator and condenser

b.	Differential type flow switches shall be supplied by chiller manufacturer (installed by others) to shutdown unit when flow drops below minimum. Differential pressure flow switches shall be similar to SOR Inc. series 102

c.	Furnish controls to avoid chiller system cycling due to transient high and low pressure conditions by not allowing compressor to load for safe period of time. Persistent condition will allow chiller to shut down automatically. Display shall denote high or low pressure condition as the governing chiller control factor

d.	Rejection of improper input which is potentially harmful to unit operation and corresponding display message

4.	Status and monitoring capabilities.

a.	Capabilities shall include system pressure and temperature reading, as follows

(1)	Read directly from alpha-numeric display in PSIA/Deg F

(2)	Pressure:

(a)	Evaporator/condenser refrigerant pressures

(b)	Oil pressure.

(c)	Purge pressure

(3)	Temperature.

(a)	Return/leaving chilled water temperatures

(b)	Return/leaving condenser water temperatures

(c)	Evaporator/condenser saturation temperatures

(d)	Compressor discharge temperature.

(e)	Oil temperature.

b.	Capabilities shall include annunciation of safety controls through alpha-numeric display

(1)	Day.

(2)	Time of shutdown.

(3)	Cause of shutdown.

(4)	Type of restart required.

c.	Capabilities shall include pre-rotation vane pulse rate observable thru LED indication of compressor loading/unloading condition, battery backup to maintain all set points for a month in case of power loss and heat exchanger efficiency display to identify tube cleaning/water treatment requirements

PANEL

NOTE: EDIT ACCESSORIES AS REQUIRED TO SUIT PROJECT.

M.	Accessories:

1.	Factory insulation: Minimum 3/4" foam insulation for all components and surfaces which will sweat. Flame spread and smoke developed ratings shall not exceed 25 and 50 respectively

NOTE: PROVIDE HOT GAS BYPASS IF OPERATION BELOW 20% IS REQUIRED.

2.	Automatic hot gas bypass: To allow stable operation down to 0% load with scheduled flow rates, leaving CHW temp and leaving CW temp or HW temp (if heat recovery is scheduled). Provide all controls for fully automatic operation

3.	Vibration isolators: molded neoprene pads.

4.	Marine-type water boxes: Provide for evaporator, condenser and heat recovery condenser. Refer to drawings for pass arrangement

5.	Flow switches: Provide for CHW, CW and heat recovery water piping (if scheduled). Differential pressure type. Flow switches shall be supplied by refrigeration machine supplier, shall be suitable for reliable operation down to 50% of specified flow rate, and shall be set to trip at 50% flow

6.	Refrigerant and oil changes: Manufacturer shall provide full change of all fluids and guarantee such changes for one year

N.	Services:

NOTE: USE ON PROJECTS WHERE EQUIPMENT MAY BE DELIVERED LONG BEFORE IT IS PLACED IN SERVICE. MFGR'S STANDARD WARRANTY IS TYPICALLY 18 MONTHS FROM SHIPMENT OR 12 MONTHS FROM START-UP, WHICHEVER COMES FIRST

1.	Extended warranty: To cover parts and labor for 30 months from shipment or 12 months from start-up.

2.	Factory performance test: Test refrigeration machines in the factory under all scheduled operating conditions. Two weeks prior to tests, advise architect of the time and location of the test. The Owner and his representatives may choose to witness these tests. Perform test in accordance with ARI standard 550, and demostrate that refrigeration machine performance conforms to the tolerances of that standard

a.	Should the machine fail to meet the specified performace requirements, modify machine as required and retest as required to demostrate specified performance. Any modifications and re-testing shall be done at no additional cost to Owner and with no extension in project schedule

b.	Submit modifications for review prior to implementation.

3.	Start-up services: As specified in Part 3 - Installation.

3)	Remote pump-down unit:

A.	Provide remote pump-down unit if a high pressure refrigerant, as defined above, is utilized and if a unit-mounted pump-down unit is not included. Remote pump-down unit shall be as specified for unit-mounted type. Receiver capacity shall be minimum 133% of refrigerant volume of largest refrigeration machine served

4)	REFRIGERATION PLANT ACCESSORIES.

NOTE: COORDINATE WITH ELECTRICAL & CONTROLS ENGINEERS.

A.	Emergency switches: breakglass type, single pole, double throw, suitable for 250 volts, rated at 10 amps at 125 volts AC, surface mounted, aluminum construction with hammer and chain and with red finish. Cover designation shall read, "To Stop Refrigeration". ASCO Model 124302.

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Refrigeration machine: Set machine on vibration isolation pads or other supports as specified. Level machine to within manufacturer's tolerances

NOTE: DRAWINGS MUST INCLUDE REFRIGERATION MACHINE PIPING DETAIL.

B.	Piping: Provide piping as shown on drawings and as recommended by manunacturer, including all accessory piping to purge units, pump-down units, bearings, etc

1.	Refrigeration relief: Vent to outdoors minimum 12 ft above grade in a safe manner in accordance with local codes. outlet shall be turned downward. Provide relief valve downstream of each rupture disc for high pressure refrigerants

2.	Provide piping between refrigeration units and remote pump-down receiver if required

C.	Foundations: refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING, AND AIR CONDITIONING WORK

NOTE: FOR NEW YORK CITY.

D.	Nameplates: in addition to manufacturers's standard nameplate, as specified in ASHRAE standard 15, provide engraved brassing with minimum 0.5 inch letters on each refrigeration unit to indicated the name and address of installer, horsepower or equivalent kw of primemover type and number of pounds of refrigerant and pressure applied for refrigerant leakage test

NOTE: FOR NEW YORK CITY.

E.	Provide typed emergency operating instructions as noted. One set of instructions shall be permanently mounted under glass as directed on the mechanical room wall. Additional copies shall be included in the operating & maintenance manuals

2)	START-UP

A.	Start-up shall be supervised by the refrigeration unit manufacturer's representative. The Contractor shall advise the Architect in writing of start-up schedule two days prior to initiating start-up procedure. All start-up procedures shall be as recommended by manufacturer, but not less than the following:

B.	Leak testing: perform leak testing using refrigerant and dry nitrogen charge at minimum 150% of working pressure, but not less than 15 psig, and test with electronic leak detector. Repair leaks as required and as directed by unit manufacturer's representative. Retest as required to prove unit tight

C.	Dehydrating: Dehydrate unit if field assembly or reassembly is required, or if at any point the refrigerant holding charge pressure drops below manufacturer's specifications. Produce vacuum of 2.5 inch Hg gauge and maintain vacuum for minimum 24 hours with maximum 0.05 inch Hg pressure rise. If leakage rate exceeds 0.05 inch Hg in 24 hours, repeat leak test and repair leaks before dehydrating

D.	Refrigeration charging: keep isolation springs blocked to prevent movement in any direction while transferring refrigerant between vessels

E.	The refrigerantion unit manufacturer shall certify completion of the charging, start-up and field testing and make unit ready for proper operation. Submit six copies of start-up log

F.	Upon completion and acceptance of installation, provide services of competent instructor for period of two 8-hour days, to properly acquaint Owner's operating personnel with all details so as to enable them to obtain maximum efficiency in refrigeration machine operation. Obtain written acceptance for each instruction day from the Owner's representative