WaterFurnace Envision Hydronic (NSW) - Manual (Page 43)

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NSW INSTALLATION MANUAL
Troubleshooting Guideline for Refrigerant Circuit
The chart below will assist in determining if measurements taken at the unit are within factory specifications and aid in
accurate diagnosis (SYMPTOM) and repair. The chart is general in nature and represents whether a symptom would result in
normal, high, or low readings from the typical operating range.
Symptom
Head
Pressure
Suction
Pressure
Compressor
AMP Draw
Superheat Subcooling
Water (Loop)
Temperature
Differential
Under Charged System (Possible Leak) Low Low Low High* Low Low
Over Charged System High High High Normal High Normal
Low Air Flow Heating High High High* High/Normal Low Low
Low Air Flow Cooling Low Low Low Low/Normal High Low
Low Water Flow Heating Low/Normal Low/Normal Low Low High High
Low Water Flow Cooling High High High High* Low High
High Air Flow Heating Low Low Low Low High Low
High Air Flow Cooling Low High Normal High* Low Normal
High Water Flow Heating Normal Low Normal High* Normal Low
High Water Flow Cooling Low Low Low Low High Low
Low Indoor Air Temperature Heating Low Low Low Normal High Normal/High
Low Indoor Air Temperature Cooling Low Low Low Normal/Low High Low
High Indoor Air Temperature Heating High High High Normal/High* Normal/Low Normal
High Indoor Air Temperature Cooling High High High High* Low High
Restricted TXV High Low Normal/Low High* High Low
Insufficient Compressor (Possible Bad Values) Low High Low High* Normal/High Low
TXV - Bulb Loss of Charge High Low Low High* High Low
Scaled Coaxial Heat Exchange Heating Low Low Low Normal/Low High Low
Scaled Coaxial Heat Exchanger Cooling High High High Normal/Low Low Low
Restricted Filter Drier Check temperature difference (delta T) across filter drier
* Superheat will be high with high evaporator temperatures.