CH550 and CH551 Chiller Operator’s & Installation Manual
Publication Number: 91272
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© 2002-2010, IMI Cornelius Inc.
TROUBLESHOOTING
Trouble
Problem Cause
Remedy
Chiller does not operate.
A. No Power to unit.
B. Loose or poor wire connection.
C. Inoperable On/Off switch.
D. Overlaod device open.
E. Inoperable relay.
F.
Low input voltage.
A. Check main disconnect fuses,
wiring and power lead to unit.
B. Check wiring. Correct for loose
or poor wire connection.
C. Replace switch
D. Allow compressor to cool, the
install a new overload device;
replace compressor if neces-
sary.
E. Replace relay.
F.
Supplied voltage must be within
±
10% of nameplate rating.
No circulation of chilled water.
A. Line to or from chiller is
restricted.
B. Low water level.
C. Inoperable pump.
A. Inspect lines and remove any
obstructions.
B. Ensure that tank is full.
C. Check for obstruction or binding
impeller, replace pump and/or
motor if necessary.
Inadequate cooling.
A. Condenser is restricted.
B. Fan motor not operating freely.
C. Water not circulating.
D. Low refrigerant level.
E. Inoperative temperature control.
A. Clean condenser.
B. Replace fan blade and/or motor,
if necessary.
C. See “No Circulation of Chilled
Water”.
D. Charge system with refrigerant.
E. Replace thermostat.
WARNING: Disconnect electrical power to the chiller to prevent personal injury before
attempting any internal maintenance. Only qualified personnel should service the internal
components or electrical wiring.
If repairs to the chiller must be made, disconnect electrical power to the unit, then shut off
the water source.
