Daikin McQuay RCS 06F Installation Manual
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Contents
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18 IM 962-2Installation17. Adjust refrigerant charge to obtain pressures indicatedin the temperature/pressure Charging Charts starting onpage 21.18. Note weight of refrigerant tank.19. When system has stabilized, check superheat atthe suction line service valve. The actual linetemperature should be 8° to 20°F higher than thesaturation temperature corresponding to the vaporpressure. If superheat is measured at evaporator, theactual line temperature should be 6° to 10° higherthan the saturation temperature corresponding to thevapor pressure.20. Close service ports on vapor and liquid valves. Removeservice gauges.21. Replace service port caps and valve stem caps. Thesecaps must be replaced to prevent leaks.22. Record total charge quantity on rating plate.Final Leak TestingAfter the unit has been properly evacuated and charged, ahalogen leak detector should be used to detect leaks in thesystem. All piping within the condensing unit, evaporator,and interconnecting tubing should be checked for leaks. If aleak is detected, the refrigerant should be recovered beforerepairing a the leak. The Clean Air Act prohibits releasingrefrigerant into the atmosphere.Table 14: Charging HintsSymptom Possible Cause RemedyHigh head pressureAir flow to/from condenser restricted or dirty condenser Remove obstruction, relocate condensing unit,if necessary clean condenserFaulty condenser fan or motor ReplaceOvercharge of refrigerant Reduce chargeAir in system Evacuate and rechargeLow head pressure Short of refrigerant Check for leak, add chargeLow evaporator air flow Increase blower speed, check filtersLow vapor & hot compressor Short of refrigerant Check for leak—add refrigerantExcessive sweating Low indoor airflow Increase speed of air handler blower or reduce restriction,replace air filterExcess refrigerant Slowly reduce chargeTable 15: Pre-Start Check1 Is the condensing unit properly located and level? Yes No2 Is there free air movement to and from the condensing unit? Yes No3 Is the wiring connected according to the unit wiring diagram? Yes No4 Are the wiring connections tight (including those in the unit and compressor electrical box)? Yes No5 Is the unit properly grounded? Yes No6 Is the circulating air blower correctly wired? Yes No7 Is the condensing unit properly fused? Yes No8 Is the thermostat level, correctly wired and in a good location? Yes No9 Is the ductwork correctly sized, run, taped and insulated? Yes No10 Is the refrigerant tubing neatly run and the vapor line thoroughly insulated? Yes No11 Is the condensate drain properly sized, run, trapped and pitched? Yes No12 Are the refrigerant connections tight and leak tested? Yes No13 Are the filters clean and in place? Yes No14 Does the condenser fan turn freely without rubbing? Yes No15 Is the fan blade tight on the fan shaft? Yes No16 Areall covers and access panels in place to prevent air loss? Yes No |
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