
The chiller has detected a problem that could lead to equipment damage or personal injury if it is not corrected.
◆The Alarm LED lights and the STOP/RUN LED flashes red.
◆The chiller turns off the compressor, but normal operation resumes after you clear the alarm or the problem corrects itself.
◆The control displays a red LED or alarm code indicating the source of the problem.
SHUT DOWN ALARMS
Alarm | Possible cause Solution |
Refrigerant Pressure
Refrigerant pressure is either too low or too high.
High refrigerant pressure
Is the temperature of the condenser supply air or water too high?
Load conditions may be too high for proper operation.
| Is the refrigerant over- | Contact a certified refrigerant | |
| charged? | technician for servicing. | |
|
|
|
|
Low Water Alarm
Process fluid in the chiller tank is at the minimum level.
Is there enough fluid in the tank?
Check the fluid level by look- ing at the tank level sight glass at the rear of the chiller. Add fluid, if necessary. See FILLING
THE TANK.
Freeze Stat Alarm
The Freeze Stat Input is open.
Is there sufficient fluid | Check for incorrect pump rota- |
flow through he evapora- | tion and closed valves in the |
tor? | process circuit. Verify required |
| GPM rating for the chiller: |
| (GPM=2.4 x chiller ton capacity) |
|
|
Is the freezestat setting | Setting should be 10° F (5° C) |
too high? | below the operating tempera- |
| ture, and at least 5° F (2° C) |
| above the freezing point of the |
| process fluid. |
|
|
Is the freezestat sensor | Check that the sensor bulb is |
installed correctly? | well insulated and inserted |
| completely into piping well. |
|
|
UGH004/0999 | microKool Portable Chillers | TROUBLESHOOTING |