Carrier 19XR Start-up, Operation And Maintenance Instructions Manual

Also see for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR: User manual Start-up and service instructions Installation instructions Product data Installation instructions

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Carrier 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 57 page image

Always operate the condenser and chilled water pumpsduring charging operations to prevent freeze-ups.The standard 19XR chiller is shipped with the refrigerantalready charged in the vessels. However, the 19XR may beordered with a nitrogen holding charge of 15 psig (103 kPa).Evacuate the nitrogen from the entire chiller, and charge thechiller from refrigerant cylinders.CHILLER EQUALIZATION WITHOUT A PUMPOUTUNITWhen equalizing refrigerant pressure on the 19XR chillerafter service work or during the initial chiller start-up,do not use the discharge isolation valve to equalize.Either the motor cooling isolation valve or the charginghose (connected between the pumpout valves on top ofthe cooler and condenser) should be used as the equal-ization valve.To equalize the pressure differential on a refrigerant iso-lated 19XR chiller, use the terminate lockout function of theCONTROL TEST on the SERVICE menu. This helps to turnon pumps and advises the operator on proper procedures.The following steps describe how to equalize refrigerantpressure in an isolated 19XR chiller without a pumpout unit.1. Access terminate lockout function on the CONTROL TESTscreen.IMPORTANT: Turn on the chilled water and con-denser water pumps to prevent freezing.2.3. Slowly open the refrigerant cooling isolation valve. Thechiller cooler and condenser pressures will gradually equal-ize. This process takes approximately 15 minutes.4. Once the pressures have equalized, the cooler isolationvalve, the condenser isolation valve, and the hot gas iso-lation valve may now be opened. Refer to Fig. 26 and 27,for the location of the valves.Whenever turning the discharge isolation valve, besure to reattach the valve locking device. This pre-vents the valve from opening or closing during serv-ice work or during chiller operation.CHILLER EQUALIZATION WITH PUMPOUT UNIT —The following steps describe how to equalize refrigerant pres-sure on an isolated 19XR chiller using the pumpout unit.1. Access the terminate lockout function on the CONTROLTEST screen.IMPORTANT: Turn on the chilled water and con-denser water pumps to prevent possible freezing.2.3. Open valve 4 on the pumpout unit and open valves 1aand 1b on the chiller cooler and condenser, Fig. 26 and27. Slowly open valve 2 on the pumpout unit to equalizethe pressure. This process takes approximately15 minutes.4. Once the pressures have equalized, the discharge isola-tion valve, cooler isolation valve, optional hot gas bypassisolation valve, and the refrigerant isolation valve can beopened. Close valves 1a and 1b, and all pumpout unitvalves.Whenever turning the discharge isolation valve, besure to reattach the valve locking device. This pre-vents the valve from opening or closing during serv-ice work or during chiller operation.The full refrigerant charge on the 19XR will vary withchiller components and design conditions, as indicated onthe job data specifications. An approximate charge may bedetermined by adding the condenser charge to the cooler chargeas listed in Table 7.Table 7 — Refrigerant (HFC-134a) ChargeCOOLERCODEREFRIGERANTCHARGE CONDENSERCODEREFRIGERANTCHARGElb kg lb kg10 290 132 10 200 9111 310 141 11 200 9112 330 150 12 200 9115 320 145 15 250 11316 340 154 16 250 11317 370 168 17 250 11320 345 157 20 225 10221 385 175 21 225 10222 435 197 22 225 10230 350 159 30 260 11831 420 190 31 260 11832 490 222 32 260 11835 400 181 35 310 14136 480 218 36 310 14137 550 250 37 310 14140 560 254 40 280 12741 630 286 41 280 12742 690 313 42 280 12745 640 290 45 330 15046 720 327 46 330 15047 790 358 47 330 15050 750 340 50 400 18151 840 381 51 400 18152 900 408 52 400 18155 870 395 55 490 22256 940 426 56 490 22257 980 445 57 490 22260 940 426 60 420 19061 980 445 61 420 19062 1020 463 62 420 19065 1020 463 65 510 23166 1060 481 66 510 23167 1090 494 67 510 23170 1220 553 70 780 35471 1340 608 71 780 35472 1440 653 72 780 35475 1365 619 75 925 42076 1505 683 76 925 42077 1625 737 77 925 42080 1500 680 80 720 32781 1620 735 81 720 32782 1730 785 82 720 32785 1690 766 85 860 39086 1820 825 86 860 39087 1940 880 87 860 39057