Problem | Cause | Solution | |
Pump runs, compressor | Refrigerant is low. | Check the refrigerant | |
will not. | charge. | ||
| |||
|
| Sight glass should be clear | |
| Pressure switch contacts | while compressor runs. | |
| are open. | Call for service if bubbling | |
|
| or foaming | |
| Refrigerant high pressure | Check for dirty condenser. | |
| cutout switch contacts are | Check for condenser air | |
| open. | obstruction. | |
| Defective fan motor. | Repair or replace. | |
|
| Check for high/low voltage. | |
| Compressor internal | Must be within plus or | |
| minus 10% of the | ||
| overload is open. Allow | ||
| nameplate rating. Check | ||
| time to cool and reset. | ||
| for poor compressor | ||
|
| ||
|
| electrical connections. | |
| Broken wire in the | Locate and repair. | |
| compressor control circuit. | ||
|
| ||
Unit runs continuously, but | Restricted condenser | Clean the condenser. | |
not enough cooling power. | airflow. | ||
| |||
| Unit low on refrigerant. | Call Service. | |
| Inefficient compressor. | Call Service. | |
| Unit undersized for | Call Sales Representative. | |
| application. | ||
|
|
Page 38 | SMC Series Chillers |
