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Page 38 SMC Series Chillers
Problem Cause Solution
Pump runs, compressor
will not.
Refrigerant is low.
Check the refrigerant
charge.
Pressure switch contacts
are open.
Sight glass should be clear
while compressor runs.
Call for service if bubbling
or foaming
Refrigerant high pressure
cutout switch contacts are
open.
Check for dirty condenser.
Check for condenser air
obstruction.
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.
Broken wire in the
compressor control circuit.
Locate and repair.
Unit runs continuously, but
not enough cooling power.
Restricted condenser
airflow.
Clean the condenser.
Unit low on refrigerant. Call Service.
Inefficient compressor. Call Service.
Unit undersized for
application.
Call Sales Representative.