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Automatically Resets When Discharge
Pressure Falls To A Safe Level - Control Located Inside Chiller
Unit.
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Cause
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Remedy
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9.4.1
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Low refrigerant charge
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1.
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Check for adequate refrigerant charge (bubbles or misty sight
glass indicates low charge). If charge is low, have system
checked for leaks and recharged by a refrigeration serviceman.
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9.4.2
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Improperly set low pressure control.
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2.
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Have refrigeration serviceman reset control or replace if
defective.
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9.4.3
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Restriction in liquid line.
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3.
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Clogged filter drier. Check for pressure or temperature drop
and have drier core replaced by a refrigeration serviceman.
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4.
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Liquid line valve or suction valve on compressor is partially
closed. Open fully.
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5.
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Liquid line solenoid not opening fully or leaking during
off cycle. Have repaired or replaced if defective by a refrigeration
serviceman.
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6.
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T.X. valve plugged or inoperative. Check thermal bulb and
capillary tube for damage. Have repaired or replaced if defective
by a refrigeration serviceman.
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9.4.4
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Head pressure too low. (Water cooled)
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7.
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Adjust condenser water regulating valve to maintain 190 to
210 PSIG refrigerant head pressure. Have refrigeration serviceman
repair valve or replace if defective.
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9.4.4a
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Head pressure too low. (Air cooled)
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8.
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Check that entering air temperature is above 60° F. If below
60° F. find out reason why.
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9.4.4b
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Remote Outdoor Head Pressure
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9.
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System not operating correctly. Check fan cycling, fan speed
control or flooding values.
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9.0 | 9.1
| 9.2 | 9.3 |
9.36 | 9.3.11
| 9.4 | 9.5 |
9.6 | 9.7 | 9.8
|