Space Pak LAHP48 - Figure 20 Troubleshooting Suggestions

– 22 –
Model LAHP48 Air to Water Heat Pump — Installation, Operation & Maintenance Manual
Section 10: Troubleshooting
Condition Possible Causes Verification Solution
Unit will not start
Incorrect power supply Check power supply Supply correct power, 220-240 60Hz
Loose or broken wires Check wiring
Repair or replace wiring
Circuit breaker interrupted Check for short
Compressor running -
insufcient cooling/heating
Insufcient pipe insulation Check insulation Add/repair insulation
Dirty coil Check coil Clean coil
Low water ow Look for alarm symbol and FL fault code
Clean strainer screen
Clear blockage
Remove air in piping
Verify operation/condition of water pump
High compressor discharge
pressure in cooling
Dirty coil Check coil Clean Coil
High compressor discharge
pressure in heating
Low water ow Measure water ow through heat exchanger Flow should be a minimum of 10 GPM
Low compressor suction
pressure in cooling
Insufcient / no water ow Look for alarm symbol and FL fault code
Clean strainer screen
Clear blockage
Remove air in piping
Verify operation/condition of water pump
Cooling operation in low Ambient
Conrm outdoor ambient is lower than typical for
cooling operation, i.e. <55°F
If low ambient cooling is desired, contact Technical Support
for procedure to modify fan operating parameters.
Compressor will not run
Power supply failure Supply correct power, 220-240 60Hz
Failed compressor contactor Replace contactor
Loose power cable Check power cable Tighten power cable
Incorrect return water temperature setting Check return water temperature setting Adjust return water temperature setting
Low glycol/water ow Look for alarm symbol and FL fault code
Clean strainer screen
Clear blockage
Remove air in piping
Fan will not run
Fan controller failure Replace fan controller
Fan motor failure Replace fan motor
Compressor runs - no
heating/cooling
No refrigerant charge Check for leaks Add appropriate refrigerant
Damaged heat exchange Check for glycol/water leaks and/or refrigerant leaks Replace heat exchanger
Low outlet glycol/water
temperature in cooling
Improper temperature control setting Check cooling temperature setpoint and differential
Contact Technical Support for instructions to reset cooling
setpoints
No load/rapid temperature drop
Ensure compressors are allowed to run a
minimum of three minutes before reaching desired
temperature
Verify cooling function when there is sufcient heat load to
allow continuous operation.
Ensure system volume is at least 40 Gallons
Figure 20 Troubleshooting Suggestions