Carrier AQUASNAP AIR COOLED CHILLERS WITH COMFORTLINK CONTROLS 30RAP010-060 Operation And Service Manual

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Carrier AQUASNAP AIR COOLED CHILLERS WITH COMFORTLINK CONTROLS 30RAP010-060 Operation And Service Manual Manual pdf 45 page image

452. Use the scrolling marquee display to adjust the CoolingSet Point.3. Fill chilled fluid circuit with clean water (with recom-mended inhibitor added) or other non-corrosive fluid tobe cooled. Bleed all air out of the high points of the sys-tem. If chilled water is to be maintained at a temperaturebelow 40 F (4.4 C) or outdoor temperatures are expectedto be below 32 F (0° C), a brine of sufficient concentra-tion must be used to prevent freeze-up at anticipatedsuction temperatures. See Table 28.4. Check tightness of all electrical connections.5. Oil should be visible in the compressor sightglass(es).See Fig. 23. An acceptable oil level in the compressors isfrom 1/8 to 3/8 of sight glass. Adjust the oil level as re-quired. See Oil Charge section on page 50 for Carrier ap-proved oils.6. Electrical power source must agree with unit nameplate.7. All condenser fan and factory installed hydronic packagepump motors are three phase. Check for proper rotationof condenser fans first BEFORE attempting to startpumps or compressors. To reverse rotation, interchangeany two of the main incoming power leads.8. Be sure system is fully charged with refrigerant (seeCheck Refrigerant Charge section on this page).9. If unit is a brine unit, check to ensure proper brine con-centration is used to prevent freezing.10. Verify proper operation of cooler and hydronic packageheaters (if installed). Heaters operate at the same voltageas the main incoming power supply and are single phase.Heater current is approximately 0.4 amps for 460 and575 v units. Heater current is approximately 0.8 amps for230 v units.START-UP AND OPERATIONNOTE: Refer to Start-Up Checklist on pages CL-1 to CL-10.Actual Start-Up — Actual start-up should be done onlyunder supervision of a qualified refrigeration mechanic.1. Be sure all service valves are open.2. Using the scrolling marquee display, set leaving-fluid setpoint (Set PointsCOOLCSP.1). No cooling rangeadjustment is necessary.3. Start chilled fluid pump (if not configured for coolerpump control).4. Turn ENABLE/OFF/REMOTE CONTACT switch toENABLE position.5. Allow unit to operate and confirm that everything is func-tioning properly. Check to see that leaving fluid tempera-ture agrees with leaving set point (Set PointsCOOLCSP.1) or (Set PointsCOOLCSP.2), or if reset isused, with the control point (Run StatusVIEWCTPT).6. Check the cooler leaving chilled water temperature to seethat it remains well above 32 F (0° C), or the brine freez-ing point if the unit is a medium temperature brine unit.7. Recheck compressor oil level (see Oil Charge section).Check Refrigerant Charge — All 30RAP units areshipped with a complete operating charge of R-410A andshould be under sufficient pressure to conduct a leak test afterinstallation. If there is no system pressure, admit nitrogen untila pressure is observed and then proceed to test for leaks. Afterleaks are repaired, the system must be dehydrated.All refrigerant charging should be done through the ¼-in.Schraeder connection on the liquid line. Do NOT add refriger-ant charge through the low-pressure side of the system. If com-plete charging is required, weigh in the appropriate charge forthe circuit as shown on the unit nameplate. If partial charging isrequired, operate circuit at full load and use an accurate tem-perature sensor on the liquid line as it enters the EXV. Use theTemperatures mode on the scrolling marquee display to showthe circuit saturated condensing temperature (Tempera-turesCIR.ASCT.A) or (TemperaturesCIR.BSCT.B). Charging is most accurate at saturated dischargetemperatures of 120 to 125 F (49 to 52 C). Block condenser air-flow as required to reach this temperature range. Add refriger-ant until the system subcooling (SCT.A or SCT.B minus liquidline temperature entering EXV) is approximately 15 to 17 F(–9.4 to –8.3 C). Refrigerant VAPOR only may be added to acircuit through the 1/4-in. suction Schraeder connection on thesuction line.Table 28 — Minimum Cooler Flow Rates and Minimum Loop VolumeOIL SIGHTGLASSFig. 23 — Sight Glass Locationa30-497830RAPSIZEMINIMUM COOLER FLOWRATE (gpm)MAXIMUM COOLER FLOWRATE (gpm)MINIMUM COOLER FLOWRATE (l/s)MAXIMUM COOLER FLOWRATE (l/s)010 13 50 0.8 3.2015 17 66 1.1 4.2018 20 78 1.3 4.9020 23 91 1.5 5.7025 28 112 1.8 7.1030 33 133 2.1 8.4035 41 164 2.6 10.3040 47 186 3.0 11.7045 53 209 3.3 13.2050 57 228 3.6 14.4055 63 251 4.0 15.8060 68 270 4.3 17.0