32
Enertech Global
HP IOM, Rev. B
Superheat Subcooling
Condition
Normal
Normal
Normal operation
Normal
High
Overcharged
High
Low
Undercharged
High
High
Restriction or TXV is stuck almost closed
Low
Low
TXV is stuck open
Superheat/Subcooling Conditions
Section 10: Troubleshooting
Refrigeration Troubleshooting
System Faults
Mode
Discharge
Pressure
Suction
Pressure
Superheat
Subcooling
Air TD
Water TD Compressor
Amps
Under Charge
Heat
Low
Low
High
Low
Low
Low
Low
Cool
Low
Low
High
Low
Low
Low
Low
Over Charge
Heat
High
High/Normal
Normal
High
High
Normal
High
Cool
High
High/Normal
Normal
High
Normal
High
High
Low Air Flow
Heat
High
High/Normal
Normal
High/Normal
High
Low
High
Cool
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Low Source
Water Flow
Heat
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Cool
High
High/Normal
Normal
High/Normal
High
Low
High
Low Load
Water Flow
Heat
High
High/Normal
Normal
High/Normal
High
Low
High
Cool
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Restricted TXV
Heat
High
Low
High
High
Low
Low
Low
Cool
High
Low
High
High
Low
Low
Low
TXV Stuck Open
Heat
Low
High/Normal
Low
Low
Low
Low
High
Cool
Low
High/Normal
Low
Low
Low
Low
High
Inadequate
Compression
Heat
Low
High
High/Normal
Low/Normal
Low
Low
Low
Cool
Low
High
High/Normal
Low/Normal
Low
Low
Low