Trane MAXA i-HPV5H 0140 - Page 43

i-HPV5 Inverter air/water heat pumps with axial fan
43
PROBLEM CAUSE SOLUTION
Compressor does not start be-
cause of protecve devices
Increase in discharge pressure
Low inlet pressure
Incorrect power supply
Incorrect wiring
Incorrect working condions
Thermal protecon intervenon
Check
Damaged pressure switch Repalce
High exhaust pressure
High outside air temperature
High water return temperature
Air in the hydraulic circuit
Refrigerant gas charge too high
Check
Poor air ow
Poor water ow rate
Check the fan and pump operaon
Low exhaust pressure
High outdoor air temperature
Low plant return water temperature
Residual humidity in the cooling circuit
Air in the hydraulic circuit
Insucient refrigerant gas charge
Check
High sucon pressure
High outdoor air temperature
Low plant return water temperature
Expansion valve remains too opened / dam-
aged
Check
Low compressor sucon pressure
Low outdoor air temperature
Low plant return water temperature
Expansion valve remains too closed / clogged/
damaged
Dirty plate heat exchanger
Check
Low air ow rate
Low water ow rate
Check the fan and pump operaon