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Problem | Possible Cause | Solution | |
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| Verify proper rotation; if | |
| Pump is running in reverse. | incorrect, see Changing | |
| Rotation Direction on Page | ||
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| 25 for more information. | |
Pump pressure is too low. |
| Clean the system. You may | |
| also have to pull the pump | ||
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| Check for foreign matter. | and inspect the impeller. | |
| Check for foam in the water | ||
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| circuit; add | |
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| needed. | |
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| Isolate evaporator, thaw out, | |
Process water pressure low, |
| check for leaks. Check | |
Evaporator frozen. | coolant solution. Coolant | ||
pressure at pump high. | solution should be good for at | ||
| |||
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| least 10ºF (6ºC) below | |
|
| leaving water temperature. | |
| Restricted condenser air flow. | Clean air filters, clean | |
| condenser, check water flow. | ||
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| Refrigerant not feeding. | Check superheat on | |
| expansion valve. | ||
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| Improper water/glycol | Make sure that coolant | |
| mixture protection is right for | ||
| solution. | ||
Unit runs continuously, but | the process. | ||
| |||
not enough cooling | Poor heat transfer in | Backflush and clean | |
power. | evaporator. | evaporator. | |
| Unit low on refrigerant. | Call service. | |
| Low water flow through | Increase flow to design flow | |
| evaporator. | of 2.4 gpm/ton. | |
| Inefficient compressor. | Call service. | |
| Unit | Call sales representative. | |
| application. | ||
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SSC Series Central Chilling Stations | Page 79 of 86 |