SHUT DOWN ALARMS
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.
Alarm | Possible cause Solution |
Refrigerant Pressure
Refrigerant pressure is either too low or too high.
WARNING:
The microKool should be tested and repaired only by qualified techni- cians equipped with the correct tools and trained in the mainte- nance and repair of electrical and refriger- ant systems used in industrial applications.
Low refrigerant pressure:
Is the refrigerant charge low?
Is the liquid refrigerant line restricted?
High refrigerant pressure
Has the water or air flow through the condenser become restricted?
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See CHECKING REFRIGERANT
CHARGE. Check for leaks in the refrigerant circuit. Contact a certified refrigerant technician to repair and recharge the sys- tem.
Check for closed valves or a plugged refrigerant line.
❒Verify that the liquid line
❒Verify that the suction valve at the compressor is open.
❒Verify that the expansion valve is working properly.
Check for closed valves and obstructions, contaminants or dirt that may have blocked or restricted condenser efficiency.
All models:
❒Clean the condenser coils. See
CLEANING CONDENSERS.
Air-cooled units:
❒Remove any obstructions to air flow at the condenser air inlet and outlet.
❒Verify that the condenser fans are working. Confirm proper rotation and check for an elec- trical overload.
Water-cooled units:
❒Check for closed valves or plugged water supply lines.
❒Verify that the condenser water supply is working and that incoming water pressure is at least 25 psi.
TROUBLESHOOTING | microKool Portable Chillers | UGH004/0999 |
