H15.REV

PACKAGED RECIPROCATING WATER CHILLERS

NOTE: FINAL COPY: JANUARY, 1987.

NOTE: THIS SECTION FOR WATER COOLED WATER CHILLER UNITS.

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work 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.	Chillers.

2.	Piping.

3.	Refrigeration Plant Accessories.

4.	Refrigerant Relief System.

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.	PIPING.

2.	CHILLED WATER SYSTEM.

3.	CONDENSER WATER SYSTEM (Packaged Cooling Towers).

4.	INSULATION.

5.	MOTORS.

6.	AUTOMATIC CONTROL SYSTEMS.

7.	-----.

3)	REFERENCE STANDARDS

A.	ASHRAE Standard 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.

B.	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 service 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 scheduled flow rates and entering conditions

B.	Detailed and dimensioned shop drawings for foundations.

C.	Refrigeration plant accessories.

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS: Carrier Air Conditioning Company, Dunham-Bush, Inc, Trane Company York Corporation, McQuay Inc

2)	PIPING

A.	Provide condenser water and chilled water piping as noted for respective piping systems

B.	Refrigerant relief: Refer to Section "PIPING". Provide soldered wrought-copper type fittings

3)	CHILLERS

A.	Serviceable hermetic type compressors, suitable for use with R-22, direct-driven, 1750 rpm, with suction strainer, crankcase heater, hot gas muffler, replaceable main bearings, reversible main bearings, suction and discharge stop valves, spring type vibration isolators for compressors and oil level sight-glass

1.	Capacity control:

MULT

a.	Multiple compressors with independent refrigerant circuits

b.	Compressor with unloaders.

MULT

c.	Unloaded start.

NOTE: SELECT 300 PSIG PRESSURE RATING IF REQUIRED.

B.	Evaporators: direct expansion shell and tube type, ASME stamped, with copper tubes, removable heads, 150 psig water-side pressure rating, flanged connections for sizes 2-1/2" and larger and either screwed or flanged connections for smaller sizes

C.	Condensers: shell-and-tube type ASME stamped, with copper tubes, removable heads, 150 psig water-side pressure rating, flanged conections for sizes 2-1/2" and larger, and either screwed or flanged connections for smaller sizes. Refrigerant accessories shall include rupture disc, liquid line shutoff valves, refrigerant charging valved connection and purge check

D.	Refrigerant accessories: Provide each refrigerant circuit with

1.	Combination filter and dryer in liquid line with two (2) replaceable cartridges, similar to Sporlan Catchall, replaceable core type

2.	Combination sight-glass and moisture indicator, similar to Sporlan See-All

3.	Liquid line solenoid valve with manual lift stem.

4.	Thermostatic expansion valve with external equalizer, superheat adjustment, capillary and bulb charge, similar to Sporlan Valve Co

E.	Insulation: Provide all surfaces subject to sweating with a minimum of 1 inch thick foamed insulation, factory installed. Flame spread and smoke develped rating shall not exceed 25 and 50 respectively

F.	For finish, provide factory applied enamel paint of acceptable color

G.	Provide high starting torque type compressor motors if compressor is not unloaded at start-up

H.	Provide factory-mounted and prewired control cabinet with pressure gauges for refrigerant suction and discharge. Refrigerant dual-pressure switches shall be manual reset on high pressure cutout. Provide oil pressure safety switches

TEM

1.	Leaving water temperature shall be controlled to plus or minus 1 deg F by sensor in leaving water piping operating by external capacity step unloader

TEM

2.	Provide compressor indicating lights and start-stop switches

3.	Control circuit shall be 120 volt, 60 hertz from transformer. Time delay relay shall prevent short cycling of compressors. Crankcase heater control shall be on when compressor is inoperative

4.	Provide terminal block. For manual reset freezestat, bulb located in cooler shell near chilled water outlet shall stop compressor on low water temperature

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

a.	Provide combination fused disconnect switch and magnetic starter type controller for each motor

I.	Provide flow switches for chilled water and condenser water to prevent compressor operation without adequate water flow

J.	Provide chiller factory tested, dehydrated and charged with refrigerant and oil

4)	REFRIGERATION EMERGENCY SWITCH

A.	Provide break-glass type, similar to Acme Fire Alarm Co. 390 Series, to shut down chiller and to start room exhaust.

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