|
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
|
