Problem | Possible cause | Solution | |
| Water/glycol mixture inadequate | Make sure that the water/glycol mixture | |
| protection is right for the process. | ||
| for process. | ||
|
| ||
| Defective or improperly set | Adjust or replace. | |
Water temperature is too high. | High/Low thermostat. | ||
| |||
| Refrigerant low pressure switch is | Call service to adjust pressure control. | |
| set too high. | ||
|
| ||
| Refrigerant charge is low. | Call service to find and repair the leak, | |
| then have refrigerant added. | ||
|
| ||
|
| Verify rotation; if running in reverse | |
Pump pressure low (refer to curves | Pump running in reverse. | rotation, reverse any two main power | |
for normal pressure for various | leads. | ||
| |||
pumps). |
| rotation. | |
| Check for foreign matter. | Clean the system. | |
Pump pressure is too high. | Restricted water flow. | Check for partially closed valves etc. | |
Make sure that all lines are properly | |||
|
| sized. | |
| Restricted condenser air. | Clean filters. | |
Unit runs continuously, but not |
| Clean condenser. | |
Unit low on refrigerant. | Check the refrigerant charge. | ||
enough cooling power. | Compressor not operating | Call service. | |
| efficiently. | ||
|
| ||
| Unit | Call sales rep. |
Chapter 6: Troubleshooting | 42 of 78 |