Troubleshooting - Daikin VHF Installation And Maintenance Manual

Table 24: Troubleshooting refrigeration circuit
Head
Symptom
Pressure
Charge
Low
Undercharge System
(Possible Leak)
Overcharge System High
Low Air Flow Heating High
Low Air Flow Cooling Low
Low
Low Water Flow
Heating
Normal
Low Water Flow
High
Cooling
High Air Flow Heating Low
High Air Flow
Low
Cooling
High Water Flow
Normal
Heating
High Water Flow
Low
Cooling
TXV Restricted High
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Suction Compressor
Pressure Amp Draw
Low Low
High High
High High
Low Low
Low
Low
Normal
High High
Low Low
High Normal
Low Normal
Low Low
Normal
Low
Low
Super Heat Subcooling
High Low
Normal High
High
Low
Normal
Low
High
Normal
Low High
High Low
Low High
High Low
High Normal
Low High
High High
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t
roubleshooting
Water (Loops)
Air Temp
Temp
Differential
Differential
Low Low
Normal
Normal
Low
High Low
High Low
Low High
Low High
Low Low
Low Normal
Normal Low
Normal Low
Low Low
Vertical Stack WSHP • IM 986-11
Safety Lock
Out
Low Pressure
High Pressure
High Pressure
Low Temp
Low Temp
High Pressure
Low Temp
High Pressure
High Pressure
Low Temp