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READ AND REMOVE THIS PAGE BEFORE PLACING
THE SPECIFICATION SECTION IN THE CONTRACT

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DIVISION 17: SUPPLIES AND SERVICES

CHILLERS SPECIFICATION NO. 17706

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		*			NOTICE TO DESIGNER !				*

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•	ab		1.  	DO NOT USE DIVISION 1 thru 16 SPECIFICATIONS	*
            *      	WITH THIS SPECIFICATION.    				*
      *	                 							*
      *    	2.	Check with procurement personnel for wording   	*
            *       	on the following:	    					*
            *       	Section E - Inspection                         	*
      *      	Section F - Delivery Schedule                  	*
           	*      	Section G - Inspector/COR                      	*
           	*      	Section H - Payment/Invoices                   	*
      *      	Section J - Drawings             	    		*
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      *  *  * * * * * * * * * * * * * * * * * * * * * * * * * * * *

USE:		Furnish air-cooled water chillers.

NOTES TO SPECIFIER:

	A.	Options within paragraphs are identified by enclosure in brackets; blank spaces enclosed by brackets [_____] provide for information to be inserted, as appropriate, to individual projects.

	B.	TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES, the specifier must edit (delete, substitute or add to the text).  The remaining paragraphs must be renumbered.

	C.	DELETE FOR FINAL COPY: Notes to the Specifier, located between lines of asterisks; all [brackets], underlining, boldface, and italics, within the paragraphs; and this page.  (Open Reveal Codes [alt F3] to do this accurately.)

	D.	To Edit “(Footer B)”: (Corel 8).  ENTIRE FOOTER SHOULD BE BOLDED.  Click in the footer and delete the “Project Name (ftr B)” text and replace it with the Name of the Project (upper and lower case).  Replace date with current MM/YY (WITHOUT BRACKETS).

	E.	The Guide Specifications are intended to be continuously reviewed and revised.  User’s technical comments are appreciated.  Also, other related or similar specification that are written “from scratch” that could benefit others, or other questions can be sent to NSTC A/E Group, ST 110, or call (303) 987-6868.

DRAWING DATA REQUIRED:

REQUIRED SPEC. MODIFICATIONS: [Note: None identified on original. J]	

REVISIONS OF THIS SECTION:
CSI format, editorial changes: 12/01
Metric:  
Technical Update: 01/92

SECTION C-DESCRIPTION/SPECS./WORK STATEMENT
CHILLERS SPECIFICATION NO. 17706, Rev. 01-92

C.1.0	GENERAL:

C.1.1	Description of Work:  Furnish four air cooled water chillers having a capacity of 36.5 tons of refrigeration, cooling 88 gpm from 55 degrees F to 45 degrees F when operating in 95 degree F ambient air. The water pressure drop shall not exceed 3.5 feet of water.  The chillers shall be for the Administration, Paraloft, and Kitchen Buildings at the Boise Inter-Agency Fire Center in Ada County, Idaho.

C.1.2	References:

C.1.2.1	Air Conditioning and Refrigeration Institute:
	ARI 590-86		Reciprocating Water-Chilling Packages

C.1.2.2	American National Standards Institute:
	ANSI 15-89		Safety Code for Mechanical Refrigeration

C.1.2.3	National Fire Protection Association:
	NFPA 70-90		National Electric Code

C.1.3	Equipment Requirements:

C.1.3.1	General:  The chillers shall operate on 208 volt, 60 hertz, 3 phase electrical service.  Total unit power consumption shall not exceed 43.1 KW at 36.5 tons of refrigeration and 95 degree F ambient air.  The chillers shall have dual independent refrigerant circuits for part-load standby operation and include a lead-lag switch.  The chillers shall be completely factory assembled on a rugged steel channel base and be individually performance tested at full and part-load conditions.  The chillers shall be leak tested and shipped with a full operating charge of Refrigerant 22.  Construction and ratings shall be in accordance with ARI 590, ANSI 15, NFPA 70, CSA (Canadian Standards Association) and ETL (Environmental Testing Laboratories).  Chillers shall be McQuay Model ALR-040C or equal.

C.1.3.2	Cabinet:  Chiller casing and all structural members shall be fabricated of continuous galvanized steel and galvanized steel channel.  Exterior casing shall be phosphatized and painted with a beige urethane finish.

C.1.3.3	Compressors:  Shall be accessible hermetic reciprocating type with suction and discharge service valves, oil crankcase heater, suction strainer, oil strainer, oil sightglass, and oil charging connection.  Compressors shall have a force feed lubrication system with reversible oil pump and operating oil charge.  Compressor motors shall be refrigerant gas cooled, high torque, hermetic induction type, 1750  RPM with inherent thermal protection in all three phases.  Compressors shall be mounted on rubber pads to minimize noise and vibration transmissions.  An oil equalization line shall be provided on units employing two compressors per refrigerant circuit.

C.1.3.4	Evaporators:  Shall be direct expansion type with carbon steel barrel, polypropylene water baffles, and high efficiency internally finned through-tubes roll expanded in heavy carbon steel tube sheets.  Refrigerant heads shall be removable.  The evaporator shall be wrapped with a heater cable, insulated with 3/4 inch thick closed cell polyurethane insulation, and painted with vinyl paint to resist cracking.  The heater cable and insulation shall provide freeze protection down to -20 degrees F ambient air temperature.  The evaporator shall be designed, constructed, inspected and stamped with applicable ASME code requirements.

C.1.3.5	Condenser Coils:  Shall be constructed of 3/8 inch outside diameter seamless copper tubes mechanically expanded in plate-type aluminum fins.  The fins shall have full drawn collars to completely cover the copper tube and protect against atmospheric corrosion.  A subcooling coil shall be an integral part of the main condenser coil.  The condenser coils shall have a combined total face area of 56.6 square feet.  Nominal temperature difference between refrigerant condensing temperature and ambient air temperature shall be 30 degrees F.

C.1.3.6	Condenser Fans and Motors:  Condenser fans shall be propeller type arranged for vertical air discharge and shall be individually driven by direct drive fan motors.  Fan blades shall be steel with  a black paint finish or unpainted aluminum.  Each fan shall be protected by a heavy gauge fan guard.  Condenser fan motors shall be 3 phase, direct drive, 1140 RPM, open dripproof type positioned within the unit cabinet for weather protection.

C.1.3.7	Controls:  Field power connections, control interlock terminals and unit control systems shall be centrally located in a weatherproof enclosure.  Panel access doors shall be key lock and include steel rod door retainers to prevent flapping while open.  Dead front panels shall protect service personnel against accidental contact with line voltage components.  Power and starting components shall include factory fusing of fan motors and control circuit, starting contactors including individual contactors for each fan motor, solid-state compressor sequence start timers, solid-state compressor overload protection in all three phases, inherent condenser fan motor overload protection, and unit power terminal block for field connection to remote disconnect switch.

C.1.3.8	Microprocessor:  The microprocessor control system shall stage chiller, based on the leaving water temperature.  Safeties controlled by the microprocessor include; oil differential pressure and motor protection for each compressor, high pressure for each refrigerant circuit, loss of charge, loss of water flow, freeze protection, and low refrigerant pressure.  Leaving water temperature sensor shall be factory installed.  Controls shall include auto/stop switch, leaving water temperature setpoint adjustment, anti-recycle function, digital display, and the ability to accept phase loss, phase reversal, under and over voltage signal.  Display readouts include water temperature setpoints, operating temperatures, and diagnostic messages.  The microprocessor shall have the ability to display refrigerant pressures and percent unit amp draw.  The display shall be LCD type with a minimum of 32 characters, providing all messages in plain English.  Coded messages are not acceptable.  The keypad shall be equipped with 12 individual touch sensitive key switches which shall be divided into three separate sections and be password protected from changes by unauthorized personnel.  The three separate sections shall be Status, Control, and Alarm.  The microprocessor shall be capable of resetting the chilled water temperature based on return chilled water temperature;  incorporate a soft load function to prevent the compressor from operating at full load during the chilled water temperature pulldown period; incorporate two short cycle time functions, start-to-start and stop-to-start and specifically programmed to provide the least amount of time off line while providing the maximum in compressor motor protection; be capable of controlling the chilled water pumps through the use of factory supplied digital output contact; be calibrated by the use of the keypad (the use of potentiometers, rotary switches or dip switches is not acceptable);  be capable of communicating to other units or a personal computer with the use of a twisted pair wire communications RS-232 or 485 interface;  avert shutdown during critical operation by continuously performing diagnostic checks and provide a pre-alarm status indication which will allow time to take corrective action prior to a safety shutdown; limit the rate at which the chilled water loop temperature is pulled down (the pulldown rate shall be adjustable); control head pressure through intelligent cycling of condenser fans; have remote monitoring interface capability (this shall be accomplished through a twisted pair RS-232 protocol or optional phone modem); and be equipped with a timeclock to allow the end user to program a yearly schedule during the week, weekend, and holidays. A fourteen day, one year programmable holiday schedule shall override the weekly clock schedule and restrict the chiller from operating on the holiday selected.  The control system shall have auto-restart after power failure and not require external battery back-up or auxiliary power supply for maintaining program memory.  For ease of service and enhanced system reliability, the microprocessor shall be capable of storing the current and previous safety shutdowns.  Each safety shutdown occurrence shall be time and date stamped.

C.1.3.9	Refrigerant Piping:  Dual refrigerant circuits shall be completely independent of each other and include hot gas mufflers, a factory insulated suction line, manual liquid line shutoff valve with charging connection, refrigerant filter-drier, liquid sightglass/moisture indicator, liquid line solenoid valve, thermal expansion valve, purge valves, and 450 psi relief valve.

C.1.4	Submittals:

C.1.4.1	Requirements:  The Contractor shall submit to the Contracting Officer, within 15 working days after award for approval the submittals listed below.  The submittals shall be complete, and in sufficient detail to permit review of all aspects of the Contractor's proposals.  When approved by the Contracting Officer, three sets of the submittals will be retained by the Contracting Officer and three sets will be returned to the Contractor.

	a.	Operating and Maintenance Manuals:  Submit six copies of the operating and maintenance manuals for the chillers to be furnished.  A parts list shall be included with the manuals.

	b.	Installation Instructions:  Submit six copies of the installation instructions for the chillers to be furnished.

	c.	Shop Drawings:  Submit six copies of the shop drawings for the chillers to be furnished.  Shop drawing shall show the equipment, piping connections, valves, strainers, and other equipment required for a complete system.
d.	Manufacturer's Literature:  Submit six copies of the manufacturer's literature for the chillers to be furnished.

C.1.4.2	Identification:  Submittals, except color samples, shall be either blue line or black line prints on a white background and shall be identified with the following information:

	a.  Contract Number.
	b.  Project Title and Location.
	c.  Supplier's Name.
	d.  Manufacturer's Name.

C.1.4.3	Approvals:  Approval of the submittals is an indication that the Contractor's submittals have been reviewed and that there are no objections, except as noted.  Installation of materials on the basis of approved submittals shall not relieve the Contractor of responsibility for incorporating material which conforms to the requirements of the drawings and specifications.  Approval of deviations shall apply only to those deviations or omissions from the requirements of the drawings and specifications brought to the Contracting Officer's attention in writing.  After approval of an item, the Contractor may submit a substitution for approval, if the approved item cannot be purchased or delivered in time to avoid delay in completion of the project.

C.1.4.4	Timing:  Allow 15 working days for review of the submittals. Review time commences upon receipt of submittals by the Contracting Officer.

C.1.5		Quality Assurance:

C.1.5.1	Manufacturer's Qualifications:  A company regularly engaged in the manufacture of air cooled water chillers, and who issues a complete catalog on such products.   

C.1.5.2	Commercial Warranty:  Equipment furnished under this Contract shall be covered by the most favorable commercial warranties the Contractor gives to any customer for such equipment.  The rights or remedies provided herein are in addition to and do not limit any rights afforded to the Government by any other clause of this Contract.  With respect to all warranties, expressed or implied, from manufacturers or suppliers for equipment furnished under the Contract the Contractor shall:

a.	abObtain all warranties that would be given in normal commercial practices.

	b. 	Require all warranties to be executed, in writing, for the     benefit of the Government.

END OF SECTION