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VL Series Portable Chillers, 0.25 to 1.5 Tons UGH020/0301
4.1 UNIT WILL NOT START
A. Blow fuse at power supply - isolate open fuse and replace. Double
check fuse sizes against nameplate amperage.
B. Low voltage - measure incoming voltage with meter, voltage must
be within 10% of nameplate voltage or warranty will be voided.
4.2 PUMP WILL NOT START
A. Impeller bound or frozen shaft bearing in motor.
B. Open motor winding.
C. Internal overload tripped.
D. Loose wire connection or defective start capacitor.
E. On/off circuit breaker tripped.
4.3 COMPRESSOR WILL NOT START
A. Safety switch open - unsafe condition exists (consult safety switch
section in this manual).
B. Windings overheated - over temperature switch on compressor
tripped.
C. Circuit breaker tripped - reset and check amperage. Verify voltage is
correct, check for loose wire connection at motor. Defective circuit
breaker.
D. Bad or defective start capacitor.
4.4 UNIT SHUTS DOWN ON HIGH PRESSURE SWITCH
A. Low air flow across condenser. Check for dirty condenser fins.
B. Fan not operating. Check for loose fan blade or open/grounded
motor winding.
C. High ambient air temperature (above 95°F).
D. Insufficient clear space around unit.
4.5 UNIT SHUTS DOWN ON LOW PRESSURE SWITCH
A. Attempting to operate below 40°F.
B. Low refrigerant charge.