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