Space Pak SCM-036 User Manual

– 21 –
Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual
Section 10: Troubleshooting
Figure 20 Troubleshooting suggestions
Condition Possible Causes Verication Solution
Unit will not start
Incorrect power supply Check power supply Supply correct power
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 for
SCM060 or 8 GPM for SCM036
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, e.g. <55°
If low ambient cooling is desired, refer to
Section 7.
Compressor will not run
Power supply failure Supply correct power
Failed compressor contactor Replace contactor
Loose power cable Check power cable Tighten power cable
Compressor limit exceeded
Check for compressor symbols 1 and/or
3. If symbol is displayed but compressor
is inactive, thermal overload has been
tripped.
This will reset, however root cause must
be determined
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
Noisy compressor
Liquid returning to compressor
Replace compressor
Compressor failure
Fan will not run
Fan relay failure Replace fan relay
Fan motor failure Replace fan motor
Compressor runs - no heating/cooling
No refrigerant charge Check for leaks Add appropriate refrigerant
Damaged heat exchanger
Check for glycol/water leaks and/or
refrigerant leaks
Replace heat exchanger
Compressor failure Replace compressor
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 fuction when there is
sufcient heat load to allow continuous
operation.

Space Pak SCM-036 Specifications

General

Brand	Space Pak
Model	SCM-036
Category	Heat Pump
Language	English