Troubleshooting Guide - AEC PCA SERIES Operation And Installation Manual

8
Problem
Chiller will not run.
Pump runs, compressor
cycles at short intervals.
The leaving water
temperature is too high.
Pump pressure is low (see
pump curves).
Pump pressure is too high.
PCA Series Chillers

Troubleshooting Guide

Cause
No power.
Wrong voltage supplied to
the chiller.
Defective on/off switch.
Control circuit fuse blown.
Defective control
transformer.
No process load on the
chiller.
Refrigerant is low.
Refrigerant is low.
Improper water/glycol
solution.
Check for foreign matter.
Restricted water flow.
Solution
Check main disconnect
fuses, wiring, and power
lead to the unit.
Voltage must be within plus
or minus 10% of the
nameplate rating.
Replace.
Replace, check the
transformer.
Replace.
Increase the process load.
Check the refrigerant
charge.
Check the refrigerant
charge.
Make sure that the coolant
solution is right for the
process — must be 75%
water and 25% glycol.
See Figure 6 on page 16
for more information.
Clean the system.
Check for partially closed
valves, etc. Be sure all
lines are properly sized.
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