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TRANSFER REFRIGERANT FROM CHILLER TO PUMP- OUT STORAGE TANK 1. Equalize refrigerant pressure. Chillers with Isolation Valves TRANSFER ALL REFRIGERANT TO CHILLER CON- DENSER VESSEL — For chillers with isolation valves, refrigerant can be stored in one chiller vessel or the other with- out the need for an external storage tank. 1. Push refrigerant into the chiller condenser. a. Valve positions: VALVE 1a1b 2 3 4 5 8 11121314 CONDITION CC C CCC b. Using the PIC II controls, turn off the chiller water pumps and pumpout condenser water. If the chiller water pumps are not controlled through the PIC II, turn them off manually. c. Turn on the pumpout compressor to push the liq- uid refrigerant out of the chiller cooler vessel. d. When all liquid refrigerant has been pushed into the chiller condenser vessel, close chiller isolation valve 11. e. Access the PUMPDOWN LOCKOUT screen on the PIC II CONTROL TEST table to turn on the chiller water pumps. If the chiller water pumps are not controlled by the PIC II, turn them on manually. f. Turn off the pumpout compressor. 2. Evacuate the refrigerant gas from chiller cooler vessel. a. Close pumpout compressor valves 2 and 5, and open valves 3 and 4. VALVE 1a1b 2 3 4 5 8 11121314 CONDITION C CCCCCC b. Turn on the pumpout condenser water. c. Run the pumpout compressor until the chiller cooler vessel pressure reaches 18 in. Hg vac (40 kPa abs.). Monitor pressures on the CVC and on refrigerant gages. d. Close valve 1a. e. Turn off the pumpout compressor. f. Close valves 1b, 3, and 4. VALVE 1a1b 2 3 4 5 8 11121314 CONDITION C C C C C C C C C C C g. Turn off the pumpout condenser water. h. Proceed to the PUMPDOWN/LOCKOUT func- tion accessed from the CONTROL TEST table to turn off the chiller water pumps and lock out the chiller compressor. Turn off the chiller water pumps manually if they are not controlled by the PIC II. TRANSFER ALL REFRIGERANT TO CHILLER COOLER VESSEL 1. Push the refrigerant into the chiller cooler vessel. a. Valve positions: VALVE 1a1b 2 3 4 5 8 11121314 CONDITION C CC CCC b. Turn off the chiller water pumps (either through the PIC II controls or manually, if necessary) and the pumpout condenser water. c. Turn on the pumpout compressor to push the refrigerant out of the chiller condenser. d. When all liquid refrigerant is out of the chiller condenser, close the cooler isolation valve 11. e. Turn off the pumpout compressor. a. Valve positions: VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C C C b. Slowly open valve 5. When the pressures are equalized, open liquid line valve 7 to allow liquid refrigerant to drain by gravity into the pumpout storage tank. VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C 2. Transfer the remaining liquid. a. b. Turn off the pumpout condenser water. Place the valves in the following positions: VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C Run the pumpout compressor for approximately 30 minutes; then close valve 10. VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C C c. 3. Remove any remaining refrigerant. Turn off the pumpout compressor. a. Turn on the chiller water pumps using the PUMP- DOWN LOCKOUT screen, accessed from the CONTROL TEST table. Turn on the pumps man- ually, if they are not controlled by the PIC II. b. Turn on the pumpout condenser water. c. Place valves in the following positions: VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C C d. Run the pumpout compressor until the chiller pressure reaches 30 psig (207 kPa) for HFC-134a. Then, shut off the pumpout compressor. Warm condenser water will boil off any entrapped liquid refrigerant and the chiller pressure will rise. e. When the pressure rises to 40 psig (276 kPa) for HFC-134a, turn on the pumpout compressor until the pressure again reaches 30 psig (207 kPa), and then turn off the pumpout compressor. Repeat this process until the pressure no longer rises. Then, turn on the pumpout compressor and pump until the pressure reaches18 in. Hg. (40 kPa absolute). f. Close valves 1a, 1b, 3, 4, 6, 7, and 10. VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C C C C C C C C g. Turn off the pumpout condenser water and con- tinue to use the PIC II PUMPDOWN LOCKOUT screen functions, which lock out the chiller com- pressor for operation. 4. Establish a vacuum for service. To conserve refrigerant, operate the pumpout compressor until the chiller pressure is reduced to 18 in. Hg vac., ref 30 in. bar. (40 kPa abs.) following Step 3e. 70PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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