GSA, Philatlantic Realty District,the Wanamaker Building,100 Penn Square Eas T, Philadelphia, PA 19107-3396

J -- REPAIR 80TON A/C COMPRESSOR SOL GS-03P-99-PSM-0215 DUE 091099 POC Gregory Fields, (215)381-3472 Scope of Work: Air Conditioning System -- Evaluate and Repair Existing 80 Ton Compressor 1. Air Handler/Exhaust Fans a. Measure actual air quantity for outside Air and supply air. b. Measure actual air quality for kitchen exhaust system. c. Check condition of the fans, condition of the fan belts, positions of the outside air and return air dampers, possibility of blockage in the duct or evaporative coils and the cleanliness of the coil surface. d. Report the above test results before proceeding. NOTE 1-e. e. Rebalance existing air handler supply fans to provide the maximum available airflow. Adjust outside air damper to provide the outside air equal to kitchen exhaust air but not less than 5000 CFM. 2. Compressor/Evaporator Qualified refrigerator contractor, preferably a Carrier technician, shall verify the following: a. Check the thermostatic expansion valves, including the sensing bulb performance and proper installation of the sensing bulb. b. Check the performance of the following componentsof the automatic pumpdown control system. c. The solenoid valve in each branch line to the evaporator. d. Low pressure switch. e. Electrical interlock of the liquid solenoid valve with the evaporator fan. f. Electrical interlock of the refrigerant solenoid valve with the safety devices such as high pressure cutout, oil safety switch and motor overloads. g. Low pressure settings, such that the cut-in point corresponds to a saturated refrigerant temperature lower than any ambient air temperature to which the compressor may be subjected. h. Check the head pressure controller setting per the manufacturer recommendation. i. Provide a suction accumulator as a safety measure. j. Repair the rebuilt compressor. k. Test and start-up the system and run for a minimum of twenty-four (24) hours. l. Prepare a complete written report, including the checking procedure, failure of components, accomplished corrective measures, and result of testing and start-up of system. 3. Compressor Modification Provide hot gas bypass to enable compressor to operate at loads below 25% of capacity (lowest step available with existing cylinder unloaders), sized and installed per Carrier's recommendations. 4. Warranty All repair work performed under this contract shall be warranted for a period of one (1) year from the date of acceptance of the work by the Government. Satisfactory warranty documents must be submitted at the completion of work. A pre-bid inspection of the work site will be held at 11:00 am on August 25, 1999 for contractors prior to submitting bids on this project. Failure to inspect the premises will not be grounds for a claim after the contract has been awarded. All work is to be performed in accordance with this scope of work. Posted 08/13/99 (W-SN367458). (0225)

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