York YAWS018 - 075 Installation Manual

York YAWS018 - 075 Installation Manual Manual pdf 39 page image

39Troubleshooting Guideline for Refrigerant CircuitThe chart below will assist in determining if measurements taken at the unit are within factory specifications and aid inaccurate diagnosis (SYMPTOM) and repair. The chart is general in nature and represents whether a symptom would result innormal, high, or low readings from the typical operating range.Symptom HeadPressureSuctionPressureCompressorAmp Draw Superheat Subcooling Water Temp.DifferentialUnder Charged System (Possible Leak) Low Low Low High Low LowOver Charged System High High High Normal High NormalLow Water Flow Evaporator Low/Normal Low/Normal Low Low High HighLow Water Flow Condensor High High High High Low HighHigh Water Flow Evaporator Normal Low Normal High Normal LowHigh Water Flow Condensor Low Low Low Low High LowRestricted TXV (Check Service Advisory) High Low Normal/Low High High LowInsufficient Compressor(Possible Bad Valves) Low High Low High Normal/High LowTXV - Bulb Loss of Charge Low Low Low High High LowScaled Coaxial Heat Exchanger Evaporator Low Low Low Normal/Low High LowScaled Coaxial Heat Exchanger Condensor High High High Normal/Low Low LowRestricted Filter Drier Check temperature difference (delta T) across filter drier.7/8/14AFFINITY SINGLE STAGE HYDRONIC INSTALLATION MANUAL