7 | Troubleshooting Guide | ||
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Problem | Possible cause | Solution | |
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| Check main disconnect | |
| No power. | fuses, wiring, and power lead | |
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| to the unit. | |
| Wrong voltage supplied to | Voltage must be within plus | |
Chiller will not run. | or minus 10% of the | ||
the chiller. | nameplate rating. | ||
| Defective on/off switch. | Replace. | |
| Control circuit fuse blown. | Replace, check the | |
| transformer. | ||
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| Defective control transformer. | Replace. | |
| Refrigerant is low. | Check the refrigerant charge. | |
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| Make sure that the coolant | |
The leaving water |
| solution is right for the | |
Improper water/glycol | process — must be 75% | ||
temperature is too high. | solution. | water and 25% glycol. | |
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| See Figure 3 on Page 13 for | |
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| more information. | |
Pump pressure is low | Check for foreign matter. | Clean the system. | |
(see pump curve). | |||
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| Check for partially closed | |
Pump pressure is too high. | Restricted water flow. | valves, etc. Be sure all lines | |
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| are properly sized. | |
| Refrigerant is low. | Check the refrigerant charge. | |
| Defective fan motor. | Repair or replace. | |
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| Check for high/low voltage. | |
Pump runs, compressor will | Compressor internal overload | Must be within plus or minus | |
is open. Allow time to cool | 10% of the nameplate rating. | ||
not. | |||
and reset. | Check for poor compressor | ||
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| electrical connections. | |
| Broken wire in the | Locate and repair. | |
| compressor control circuit. | ||
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| Restricted condenser airflow. | Clean the condenser. | |
Unit runs continuously, but | Unit low on refrigerant. | Call Service. | |
Inefficient compressor. | Call Service. | ||
not enough cooling power. | |||
Unit undersized for | Call Sales Representative. | ||
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| application. | ||
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PS QuarterHorse Series Chillers | Page 23 |
