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3. Open valve 4 on the pumpout unit and open valves 1a and 1b on the chiller cooler and condenser, Fig. 29 and 30. Slowly open valve 2 on the pumpout unit to equalize the pressure. This process takes approximately 15 minutes. 4. Once the pressures have equalized, the discharge isola- tion valve, cooler isolation valve, optional hot gas bypass isolation valve, and the refrigerant isolation valve can be opened. Close valves 1a and 1b, and all pumpout unit valves. The full refrigerant charge on the 19XR will vary with chill- er components and design conditions, as indicated on the job data specifications. An approximate charge may be determined by adding the condenser charge to the cooler charge as listed in Table 10. Use the CONTROL TEST terminate lockout function to monitor conditions and start the pumps. Table 10 — Refrigerant (HFC-134a) Charge If the chiller has been shipped with a holding charge, the refrigerant is added through the pumpout charging connection (Fig. 29 and 30, valve 1b). First evacuate the nitrogen holding charge from the chiller vessels. Charge the refrigerant as a gas until the system pressure exceeds 35 psig (141 kPa) for HFC-134a. After the chiller is beyond this pressure the refrig- erant should be charged as a liquid until all the recommended refrigerant charge has been added. The charging valve (Fig. 29 and 30, valve 7) can be used to charge liquid to the cooler if the cooler isolation valve (11) is present and is closed. Do not charge liquid through the linear float to the condenser. TRIMMING REFRIGERANT CHARGE — The 19XR is shipped with the correct charge for the design duty of the chill- er. Trimming the charge can best be accomplished when the design load is available. To trim the charge, check the tempera- ture difference between the leaving chilled water temperature and cooler refrigerant temperature at full load design condi- tions. If necessary, add or remove refrigerant to bring the temperature difference to design conditions or minimum differential. Table 10 lists the 19XR chiller refrigerant charges for each cooler and condenser code. Total refrigerant charge is the sum of the cooler and condenser charge. INITIAL START-UP Preparation — Before starting the chiller, verify: 1. Power is on to the main starter, oil pump relay, tower fan starter, oil heater relay, and the chiller control panel. 2. Cooling tower water is at proper level and at-or-below design entering temperature. 3. Chiller is charged with refrigerant and all refrigerant and oil valves are in their proper operating positions. 4. Oil is at the proper level in the reservoir sight glasses. 5. Oil reservoir temperature is above 140 F (60 C) or above refrigerant temperature plus 50° F (28° C). 6. Valves in the evaporator and condenser water circuits are open. NOTE: If the pumps are not automatic, ensure water is circulating properly. 7. Access the CONTROL TEST screen. Scroll down on the TERMINATE LOCKOUT option. Press the SELECT (to enable the chiller to start) and answer YES to reset unit to operating mode. The chiller is locked out at the factory in order to prevent accidental start-up. Dry Run to Test Start-Up Sequence For electro-mechanical starters. Whenever turning the discharge isolation valve, be sure to reattach the valve locking device. This prevents the valve from opening or closing during service work or during chiller operation. Always operate the condenser and chilled water pumps whenever charging, transferring, or removing refrigerant from the chiller. REFRIGERANT CHARGE lb 290 310 330 320 340 370 345 385 435 350 420 490 400 480 550 560 630 690 640 720 790 750 840 900 870 940 980 940 980 1020 1020 1060 1090 1220 1340 1440 1365 1505 1625 1500 1620 1730 1690 1820 1940 kg 132 141 150 145 154 168 157 175 197 159 190 222 181 218 250 254 286 313 290 327 358 340 381 408 395 426 445 426 445 463 463 481 494 553 608 653 619 683 737 680 735 785 766 825 880 CONDENSER CODE 10 11 12 15 16 17 20 21 22 30 31 32 35 36 37 40 41 42 45 46 47 50 51 52 55 56 57 60 61 62 65 66 67 70 71 72 75 76 77 80 81 82 85 86 87 lb 200 200 200 250 250 250 225 225 225 260 260 260 310 310 310 280 280 280 330 330 330 400 400 400 490 490 490 420 420 420 510 510 510 780 780 780 925 925 925 720 720 720 860 860 860 COOLER CODE REFRIGERANT CHARGE kg 10 91 11 91 12 91 15 113 16 113 17 113 20 102 21 102 22 102 30 118 31 118 32 118 35 141 36 141 37 141 40 127 41 127 42 127 45 150 46 150 47 150 50 181 51 181 52 181 55 222 56 222 57 222 60 190 61 190 62 190 65 231 66 231 67 231 70 354 71 354 72 354 75 420 76 420 77 420 80 327 81 327 82 327 85 390 86 390 87 390 1. 2. Disengage the main motor disconnect (CB1) on the start- er front panel. This should only disconnect the motor power. Power to the controls, oil pump, and starter con- trol circuit should still be energized. Observe the default screen on the CVC: the status mes- sage in the upper left-hand corner reads, “Manually Stopped,” Press the CCN or LOCAL softkey to start. If the chiller controls do not go into a start mode (“Unoc- cupied Mode” is displayed) go to the SCHEDULE screen and override the schedule or change the occupied time. Press the LOCAL softkey to begin the start-up sequences. Do not permit water or brine that is warmer than 110 F (43 C) to flow through the cooler or condenser. Refrigerant overpressure may discharge through the relief valves and result in the loss of refrigerant charge. 64PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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