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2. Evacuate the refrigerant gas from the chiller condenser vessel. a. Access the PUMPDOWN LOCKOUT function accessed from the CVC CONTROL TEST table to turn on the chiller water pumps. Turn the chiller water pumps on manually if they are not con- trolled by the PIC II. b. Close pumpout unit valves 3 and 4; open valves 2 and 5. VALVE 1a1b 2 3 4 5 8 11121314 CONDITION CC CCCCC c. Turn on the pumpout condenser water. d. Run the pumpout compressor until the chiller condenser pressure reaches 18 in. Hg vac (40 kPa abs.). Monitor pressure at the CVC and at refriger- ant gages. e. Close valve 1b. f. Turn off the pumpout compressor. g. Close valves 1a, 2, and 5. VALVE 1a1b 2 3 4 5 8 11121314 CONDITION C C C C C C C C C C C h. Turn off the pumpout condenser water. i. Proceed to the PUMPDOWN LOCKOUT test from the CVC CONTROL TEST table to turn off the chiller water pumps and lock out the chiller compressor. Turn off the chiller water pumps man- ually if they are not controlled by the PIC II. RETURN CHILLER TO NORMAL OPERATING CONDITIONS 1. Ensure vessel that was opened has been evacuated. 2. Access the TERMINATE LOCKOUT function CVC from the CONTROL TEST table to view vessel pressures and turn on chiller water pumps. If the chiller water pumps are not controlled by the PIC II, turn them on manually. 3. Open valves 1a, 1b, and 3. VALVE 1a1b 2 3 4 5 8 11121314 CONDITION C CCCCCCC 4. Slowly open valve 5, gradually increasing pressure in the evacuated vessel to 35 psig (141 kPa). Feed refrigerant slowly to prevent tube freeze up. 5. Leak test to ensure vessel integrity. 6. Open valve 5 fully. VALVE 1a1b 2 3 4 5 8 11121314 CONDITION C C CCCCC 7. Open valve 11 to equalize the liquid refrigerant level be- tween the vessels. 8. Close valves 1a, 1b, 3, and 5. 9. Open isolation valves 12, 13, and 14 (if present). VALVE 1a1b 2 3 4 5 8 11121314 CONDITION C C C C C C C 10. Proceed to the TERMINATE LOCKOUT screen (access- ed from the CONTROL TEST table) to turn off the water pumps and enable the chiller compressor for start-up. If the chiller water pumps are not controlled by the PIC II, turn them off manually. GENERAL MAINTENANCE Refrigerant Properties — The standard refrigerant for the 19XR chiller is HFC-134a. At normal atmospheric pres- sure, HFC-134a will boil at –14 F (–25 C) and must, therefore, be kept in pressurized containers or storage tanks. The refriger- ant is practically odorless when mixed with air and is noncom- bustible at atmospheric pressure. Read the Material Safety Data Sheet and the latest ASHRAE Safety Guide for Mechani- cal Refrigeration to learn more about safe handling of this refrigerant. HFC-134a will dissolve oil and some nonmetallic materi- als, dry the skin, and, in heavy concentrations, may dis- place enough oxygen to cause asphyxiation. When handling this refrigerant, protect the hands and eyes and avoid breathing fumes. Adding Refrigerant — Follow the scribed in Trim Refrigerant Charge section, this page. Removing Refrigerant — If the optional pumpout sys- tem is used, the 19XR refrigerant charge may be transferred to a pumpout storage tank or to the chiller condenser or cooler vessels. Follow the procedures in the Pumpout and Refrigerant Transfer Procedures section when transferring refrigerant from one vessel to another. AdjustingtheRefrigerantCharge—If the addi- tion or removal of refrigerant is required to improve chiller per- formance, follow the procedures given under the Trim Refrig- erant Charge section, this page. Refrigerant Leak Testing — Because HFC-134a is above atmospheric pressure at room temperature, leak testing can be performed with refrigerant in the chiller. Use an elec- tronic halide leak detector, soap bubble solution, or ultra-sonic leak detector. Ensure that the room is well ventilated and free from concentration of refrigerant to keep false readings to a minimum. Before making any necessary repairs to a leak, transfer all refrigerant from the leaking vessel. Leak Rate — It is recommended by ASHRAE that chillers be taken off line immediately and repaired if the refrigerant leak rate for the entire chiller is more than 10% of the operating refrigerant charge per year. In addition, Carrier recommends that leaks totalling less than the above rate but more than a rate of 0.1% of the total charge per year should be repaired during annual maintenance or whenever the refrigerant is transferred for other service work. Test After Service, Repair, or Major Leak — If all the refrigerant has been lost or if the chiller has been opened for service, the chiller or the affected vessels must be pressure tested and leak tested. Refer to the Leak Test Chiller section to perform a leak test. procedures de- Always use the compressor pumpdown function in the Control Test table to turn on the cooler pump and lock out the compressor when transferring refrigerant. Liquid refrig- erant may flash into a gas and cause possible freeze-up when the chiller pressure is below 30 psig (207 kPa) for HFC-134a. 71PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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