Viking VCSB360 Service Notebook page 31

PROBLEM
Compressor runs, but no
refrigeration or insuf-
ficient refrigeration
Compressor kicks out on
overload
POSSIBLE CAUSE
Permanent restriction
Low charge or no charge
No capacity or low capacity
compressor.
Air circulation on high side:
a. Condenser or grille
restricted by lint
b. condenser fan motor
running or running
slowly.
c. Condenser fan motor
top cover not in place.
High ambient and / or ab-
normal usage.
Low or high voltage
Run capacitor
31
TEST PROCEDURES-ACTION
First check for moisture restriction.
Check for crimped or damaged tubing.
Repair or replace restricted component.
Check for leak. Add leak charge to get
internal pressure. Repair leak or replace
Leaking component.
Check operating wattage and pressure.
See performance chart for wattage and
high and low side pressures. Do not
judge compressor to have low capacity
until restrictions and low charge have
been ruled out.
Clean condenser and air passage with
vacuum cleaner.
Disconnect fan motor leads and check
separately. Replace motor if defective.
Put condenser fan motor top cover in
Place.
On initial pull-down in high ambient,
the compressor may cut off on overload.
Instruct customer.
Check voltage with voltmeter. Voltage
at outlet should be 110 to 120 volts AC
at the moment of start. Low voltage
may cause false start s. High voltage
may cause compressor to overheat.
Correct voltage condition.
Check capacitor. Replace if defective.