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

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Carrier 19XRV Start-up, Operation And Maintenance Instructions Manual Manual pdf 74 page image

DISTILLING THE REFRIGERANT1. Transfer the refligerant flom the chiller to the pumpoutstorage tank as described in the Transfer the Refligerantfrom Chiller to Pumpout Storage Tank section.2. Equalize the refl'igerant pressure.a. Turn on chiller water pumps and monitor chillerpressures.b. Close pumpout and storage tank valves 2, 4, 5, and10, and close chiller charging valve 7; open chillerisolation valve 11 and any other chiller isolationvalves, if present.c. Open pumpout and storage tank valves 3 and 6;open chiller valves la and lb.VALVE la lb 2 3 4 5 6 7 10 11CONDITION C C C C Cd. Gradually crack open valve 5 to increase chillerpressure to 35 psig (241 kPa). Slowly feed refriger-ant to prevent freeze-up.e. Open valve 5 fully after the chiller pressure risesabove the freezing point of the refrigerant. Let thestorage tank and chiller pressure equalize.3. Transfer remaining refrigerant.a. Close valve 3.b. Open valve 2.c. Turn on pumpout condenser water.d. Run the pumpout compressor until the storage tankpressure reaches 5 psig (34 kPa), 18 in. Hg vacuum(41 kPa absolute) in Manual or Automatic mode.e. Turn off the pumpout compressor.f. Close valves la, lb, 2, 5, and 6.g. Turn off pumpout condenser water.VALVE la lb 2 3 4 5 6 7 10 11CONDITION C C C C C C C C C4. Drain the contaminants from the bottom of the storagetank into a containel: Dispose of contaminants safely.GENERAL MAINTENANCERefrigerant Properties -- The standard refrigerant forthe 19XRV chiller is HFC-134a. At normal atmosphericpressure, HFC-134a refrigerant will boil at -14 F (-25 C) andmust, therefore, be kept in pressurized containel.s or storagetanks. The refrigerant is practically odorless when mixed withair and is noncombustible at atmospheric pressure. Read theMaterial Safety Data Sheet and the latest ASHRAE SafetyGuide for Mechanical Refrigeration to learn more about safehandling of this refrigerant.Refrigerant HFC-134a will dissolve oil and some nonme-tallic materials, dq the skin, and, in heavy concentrations,may displace enough oxygen to cause asphyxiation. Whenhandling this refrigerant, protect the hands and eyes andavoid breathing fumes.Adding Refrigerant--Follow the procedures de-scribed in Trim Refrigerant Charge section, page 75.Always use the compressor pumpdown function in theControl Test table to turn on the cooler pump and lock outthe compressor when transfen'ing refrigerant. Liquid reflig-emnt may flash into a gas and cause water in the heaterexchanger tubes to freeze when the chiller pressure isbelow 35 psig (241 kPa) for HFC-134a, resulting in equip-ment damage.Removing Refrigerant -- If the optional pumpout sys-tem is used, the 19XRV refrigerant charge may be transferredto a pumpout storage tank or to the chiller condenser or coolervessels. Follow the procedures in the Pumpout and RefrigerantTransfer Procedmes section when transferringrefrigerant fromone vessel to another:Adjusting the Refrigerant Charge -- If the addi-tion or removal of refrigerant is required to improve chillerperformance, follow the procedures given under the TrimRefrigerant Chmge section, page 75.Refrigerant Leak Testing -- Because HFC-134a re-frigerantis above atmospheric pressure at room temperature,leak testing can be performed with refrigerant in the chillel:Use an electronic halide leak detector, soap bubble solution, orultrasonic leak detectol: Ensure that the room is well ventilatedand free from concentration of refrigerant to keep false read-ings to a minimum. Before making aW necessguy repairs to aleak, transfer all refrigerant from the leaking vessel.Leak Rate -- It is recommended by ASHRAE that chillersbe taken off line immediately and repaired if the refrigerantleak rate for the entire chiller is more than 10% of the operatingrefrigerant charge per yegu:In addition, Carrier recommends that leaks totalling lessthan the above rate but more than a rate of 0.1% of the totalchguge per yegu should be lepaired during annu_d maintenanceor whenever the refrigerant is transferred for other servicework.Test After Service, Repair, or Major Leak- Ifall the refrigerant has been lost or if the chiller has been openedfor service, the chiller or the affected vessels must be pressuretested and leak tested. Refer to the Leak Test Chiller section toperform a leak test.HFC-134a refrigerant should not be mixed with air oroxygen and pressurized for leak testing. In general, thisrefrigerant should not be present with high concentrationsof air or oxygen above atmospheric pressures, because themixture can undergo combustion, which could result inserious personal injury or death.TESTING WITH REFRIGERANT TRACER -- Use an en-vironmentally acceptable refrigerant as a tracer for leak testprocedures. Use dry nitrogen to raise the machine pressure toleak testing levels.TESTING WITHOUT REFRIGERANT TRACER -- Anoth-er method of leak testing is to pressurize with nitrogen only andto use a soap bubble solution or an ultrasonic leak detector todetermine if leaks are present.74