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

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Carrier AquaEdge 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 34 page image

34Operating the Optional Pumpout Unit (Fig. 27)Oil should be visible in the pumpout unit compressor sightglass under all operating conditions and during shutdown. If oilis low, add oil as described under Optional Pumpout SystemMaintenance section, page 42. The pumpout unit control wir-ing schematic is detailed in Fig. 28.TO READ REFRIGERANT PRESSURES (during pumpout orleak testing):1. The display on the chiller control panel is suitable fordetermining refrigerant-side pressures and low (soft) vac-uum. To assure the desired range and accuracy when mea-suring evacuation and dehydration, use a quality vacuumindicator or manometer. This can be placed on theSchrader connections on each vessel by removing thepressure transducer (Fig. 2).2. To determine pumpout storage tank pressure, a 30 in. Hgvacuum -0-400 psi (-101-0-2769 kPa) gage is attached tothe storage tank.3. Refer to Fig. 23 and 24 for valve locations and numbers.POSITIVE PRESSURE CHILLERS WITH STORAGE TANKSIn the Valve/Condition tables that accompany these instruc-tions, the letter “C” indicates a closed valve. Figures 23 and 24show the locations of the valves.DANGERDuring transfer of refrigerant into and out of the optionalstorage tank, carefully monitor the storage tank level gage.Do not fill the tank more than 90% of capacity to allow forrefrigerant expansion. Overfilling may result in damage tothe tank or the release of refrigerant which will result inpersonal injury or death.CAUTIONDo not mix refrigerants from chillers that use differentcompressor oils. Compressor damage can result.CAUTIONTransfer, addition, or removal of refrigerant in spring- iso-lated chillers may place severe stress on and damage exter-nal piping if springs have not been blocked in both up anddown directions.CAUTIONAlways run chiller cooler and condenser water pumps andalways charge or transfer refrigerant as a gas when chillervessel pressure is less than 35 psig (241 kPa). Below thesepressures, liquid refrigerant flashes into gas, resulting in ex-tremely low temperatures in the cooler/condenser tubes andpossibly causing tube freeze-up.Fig. 27 — Pumpout Unita23-1546COMPRESSOROILSEPARATORCONDENSERLEAVINGWATERENTERINGWATERVALVE5VALVE4VALVE2CONTROLPANELFRAMEASSEMBLYOILHEATERVALVE3OIL FILLFITTING2 OL2 OL2 OLMTR-1L1L2PUMP OUTCOMPRESSORCRANKCASE HEATER240-600v27-40 WATTGNDH1 H4X1 X2X2HIGH PRESSURESAFETYNC OPEN > 185psigCONTROL POWERTRANSFORMERXFMR-169 VACCC87HTR-1FU10.25AFU20.25AFU30.5A1222 34SS-1OFFAUTO ONLOW PRESSURE CONTROLNC OPEN < 7 psia (-15.7 in. HG)CLOSE > 9 psia (-11.6 in. HG)5 C X26FIELDPOWERSUPPLYL1L2L3LEGENDC — ContactorFU — FuseGND — GroundHTR — HeaterMTR — MotorNC — Normally ClosedOL — OverloadSS — Selector SwitchFig. 28 — Pumpout Unit Wiring Schematica23-1615