Carrier 19DV Series Installation, Operation And Maintenance Instructions

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Carrier 19DV Series Installation, Operation And Maintenance Instructions Manual pdf 97 page image

97NOTE 1: High leak rates are not acceptable. The necessary steps must be taken to eliminate any leak detected.NOTE 2: Fixed refrigerant detectors are not designed to find leaks as they cannot locate the leak.9.1.1 Soldering and weldingComponent, piping and connection soldering and welding operations must be carried out using the correctprocedures and by qualified operators. Pressurised containers must not be subjected to shocks, nor to largetemperature variations during maintenance and repair operations.9.1.2 Refrigerant propertiesThe standard refrigerant for the 19DV chiller is HFO R-1233zd(E). At normal atmospheric pressure, HFO R-1233zd(E) will boil at 18°C and must, therefore, be kept in pressurized containers or storage tanks.The refrigerant is practically odorless when mixed with air and is noncombustible at atmospheric pressure. Readthe Material Safety Data Sheet and the latest standard EN 378-2 to learn more about safe handling of thisrefrigerant.DANGER: HFO R-1233zd(E) in heavy concentrations may displace enough oxygen to cause asphyxiation. Whenhandling this refrigerant, protect the hands and eyes and avoid breathing fumes.9.1.3 Adding RefrigerantFollow the procedures described in Trim Refrigerant Charge section.CAUTION : Always use the compressor pumpdown function in the PUMPDOWN/LOCKOUT feature to turn on thecooler pump and lock out the compressor when transferring refrigerant. Liquid refrigerant may flash into a gas andcause possible freeze-up when the chiller pressure is below -53 kPa for HFO R-1233zd(E).9.1.4 Adjusting the Refrigerant ChargeIf the addition or removal of refrigerant is required to improve chiller performance, follow the procedures givenunder the Trim Refrigerant Charge section.9.1.5 Refrigerant Leak TestingSince parts of the refrigerant system operates in vacuum, non-condensables will enter the cooling systems. ThePIC5+ HMI will issue an alert indicating excessive purge operation. Leaks, which cause frequent purge cycles,should be repaired without delay. Non-condensable gas in the machine causes higher than normal condenserpressure, compressor surge at start-up and frequent purge cycles, so locate and repair any leaks as soon aspossible. Before making any necessary repairs to a leak, transfer all refrigerant from the vessel.9.1.6 Leak RateCarrier recommends that leaks totaling less than the above rate but more than a rate of 0.1% of the total chargeper year should be repaired during annual maintenance or whenever the refrigerant is transferred for other servicework.9.1.7 Test After Service, Repair, or Major LeakIf all the refrigerant has been lost or if the chiller has been opened for service, the chiller or the affected vesselsmust be pressure tested and leak tested. Refer to the Leak Test Chiller section to perform a leak test.WARNING : HFO R-1233zd(E) should not be mixed with air or oxygen and pressurized for leak testing. In general,this refrigerant should not be present with high concentrations of air or oxygen above atmospheric pressures,because the mixture can undergo combustion.9.1.7.1 Testing with refrigerant tracerUse an environmentally acceptable refrigerant as a tracer for leak test procedures. Use dry nitrogen to raise themachine pressure to leak testing levels.9.1.7.2 Testing without refrigerant tracerAnother method of leak testing is to pressurize with nitrogen only and to use a soap bubble solution or anultrasonic leak detector to determine if leaks are present.9.1.7.3 To pressurize with dry nitrogenNOTE: Pressurizing with dry nitrogen for leak testing should not be done if the full refrigerant charge is in thevessel because purging the nitrogen is very difficult.