TROUBLESHOOTING
SYMPTOMS
Compressor does not run
CAUSE |
|
| REMEDY |
| |
Power | line open |
| Reset | circuit breaker. | |
Control | fuse |
| Check | control | circuit |
o p e n |
|
| for ground or | short. | |
|
|
| Replace fuse. |
| |
|
|
|
| ||
Safety thermostat |
| Move | RUN/STANDBY | ||
tripped | (DGT) |
| switch | to STANDBY, | |
|
|
| then back to RUN. | ||
SYMPTOMS | CAUSE | I REMEDY |
Unit operates long or continuously
Tripped power breaker
lating pump not
Improperly wired controls
Low line voltage
Compressor motor defective
Seized compressor
Check the controls. Find cause of trip and reset breaker.
Check wiring and rewire.
Check line voltage - determine location of voltage drop and remedy deficiency.
Check motor winding for open or short. Replace compressor,
i f necessary.
Reolace comPressor.
Service load
System Noises
Compressor noisy | 1 Check valve plates |
| for valve noise. |
ReDlace comDressor (w&n bearings)
Check for loose compressor hold- down bolts.
Compressor loses oil
Compressor cycles off on toss of charge
Compressor shuts down on
Loss of charge control 1 Repair leak; erratic in action
I-
Low refrigerant charge Add refrigerant.
Compressor discharge Open valve, or re-
valve partially closed place if defective.
Air in system | 1 Purge. |
Condenser scaled Clean condenser.
Receiver not properly Repipe as required,
vented - refrigerant providing adequate
backs up into evap venting. condenser
Condenser water pump Start pump- repairor
or fans not operating replace if defective.
|
|
|
|
| relay | contacts. |
Frosted |
|
| Expansion valve | Check | cooler and | |
suction line |
|
|
|
|
| |
|
|
|
| |||
| Hot liquid line |
|
|
|
| |
|
|
|
| |||
Frosted liquid |
|
|
|
| ||
line |
|
| restricted |
|
| |
|
|
|
|
|
| |
|
|
|
| Restricted | Remove restriction | |
|
|
|
| filter drier |
|
|
Compressor | will |
|
| |||
not unload |
|
|
|
|
| |
control valve
Compressor will not load
| control valve |
|
| Plugged strainer | Clean or replace |
| (high side) | strainer. |
|
|
|
26
