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If the chilled water and condenser water pumps are not controlled by the PIC II, these pumps must be started and stopped manually at the appropriate times during the refrig- erant transfer procedure. C — FU — HP — OL — T’STAT — LEGEND Contactor Fuse, 3 Amps High-Pressure Cutout Compressor Overload Internal Thermostat Compressor Terminal Contactor Terminal Overload Terminal Pumpout Unit Terminal b. Close pumpout unit valves 2, 4, 5, 8, and 10, and close chiller charging valve 7; open chiller isola- tion valves 11, 12, 13, and 14 (if present). c. Open pumpout unit/storage tank valves 3 and 6, open chiller valves 1a and 1b. VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C CC CCC d. Slowly open valve 5 to increase chiller pressure to 68 psig 35 psig (141 kPa) for HFC-134a. Feed refrigerant slowly to prevent freeze up. e. Open valve 5 fully after the pressure rises above the freeze point of the refrigerant. Open liquid line valves 7 and 10 until refrigerant pressure equalizes. VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C Transfer the remaining refrigerant. a. Close valve 5 and open valve 4. VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C b. Turn off the chiller water pumps using the CVC (or manually, if necessary). c. Turn off the pumpout condenser water, and turn on the pumpout compressor to push liquid out of the storage tank. d. Close liquid line valve 7. e. Turn off the pumpout compressor. f. Close valves 3 and 4. g. Open valves 2 and 5. VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C C h. Turn on the pumpout condenser water. i. Run the pumpout compressor until the pumpout storage tank pressure reaches 5 psig (34 kPa) (18 in. Hg [40 kPa absolute] if repairing the tank). j. Turn off the pumpout compressor. k. Close valves 1a, 1b, 2, 5, 6, and 10. VALVE 1a1b2 3 4 5 6 7 81011121314 CONDITION C C C C C C C C C C l. Turn off pumpout condenser water. Follow Steps d and e carefully to prevent damage from freeze-up. *Bimetal thermal protector imbedded in motor winding. Fig. 35 — 23XL Pumpout Unit Wiring Schematic OIL RETURN LINE CONNECTION 2. CONDENSER WATER CONNECTIONS REFRIGERANT INLET VALVE Fig. 36 — Optional Pumpout Unit Chillers with Storage Tanks — If the chiller has iso- lation valves, leave them open for the following procedures. The letter “C” describes a closed valve. See Fig. 17, 18, 29, and 30. TRANSFER REFRIGERANT FROM PUMPOUT STOR- AGE TANK TO CHILLER 1. Equalize refrigerant pressure. a. Use the PIC II terminate lockout function on the PUMPDOWN LOCKOUT screen, accessed from the CONTROL TEST table to turn on the water pumps and monitor pressures. 69PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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