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PS QuarterHorse Series Chillers Page 23
7 Troubleshooting Guide
Problem Possible cause Solution
No power.
Check main disconnect
fuses, wiring, and power lead
to the unit.
Wrong voltage supplied to
the chiller.
Voltage must be within plus
or minus 10% of the
nameplate rating.
Defective on/off switch. Replace.
Control circuit fuse blown.
Replace, check the
transformer.
Chiller will not run.
Defective control transformer. Replace.
Refrigerant is low. Check the refrigerant charge.
The leaving water
temperature is too high.
Improper water/glycol
solution.
Make sure that the coolant
solution is right for the
process — must be 75%
water and 25% glycol.
See Figure 3 on Page 13 for
more information.
Pump pressure is low
(see pump curve).
Check for foreign matter. Clean the system.
Pump pressure is too high. Restricted water flow.
Check for partially closed
valves, etc. Be sure all lines
are properly sized.
Refrigerant is low. Check the refrigerant charge.
Defective fan motor. Repair or replace.
Compressor internal overload
is open. Allow time to cool
and reset.
Check for high/low voltage.
Must be within plus or minus
10% of the nameplate rating.
Check for poor compressor
electrical connections.
Pump runs, compressor will
not.
Broken wire in the
compressor control circuit.
Locate and repair.
Restricted condenser airflow. Clean the condenser.
Unit low on refrigerant. Call Service.
Inefficient compressor. Call Service.
Unit runs continuously, but
not enough cooling power.
Unit undersized for
application.
Call Sales Representative.