Trouble Shooting; Refrigeration - lancer S8H Installation, Operation & Service Manual

S8H Hi-Carb Superchiller 230V / 50Hz
7

Trouble Shooting

7.1

Refrigeration

TROUBLE
Compressor will not
start.
Compressor short
cycling on thermal
overload (frequent
starting and stopping
of the compressor
while ice bank control
contacts remain
closed).
Product too warm
Compressor runs too
long or doesn't cycle.
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CAUSE
Power Failure.
High condensing temperature (out on
liquid line temp sensor)
Ice bank control faulty contacts not
closing.
Check start mechanism components.
Thermal overload faulty, open circuit,
compressor seized.
Liquid Line temperature probe failure.
Dirty condenser.
Restricted air flow over unit.
Low supply voltage.
Defective thermal overload.
Check wiring connections.
Fan motor defective.
Ice bank control defective
(permanently open circuit).
Low refrigerant charge.
Check agitator motor, seized or fused.
Location too hot.
Incoming water temperature too hot.
Exceeds chiller capacity.
Location too hot.
Exceeds chiller capacity.
Loss of refrigerant.
Condenser clogged.
Fan not operating.
REMEDY
Check for blown fuse, supply cord pulled
out or supply outlet turned off.
Clean condenser/filter; clear obstructed
airflow; check fan operation; ventilate room.
Cycle power to reset.
Check Ice bank control using Procedure in
Section 8. Replace if defective.
If faulty, replace e.g. capacitors, start
relays.
Replace compressor, check condenser,
check power supply, evacuate system and
if necessary fit burnout drier to industry
standards.
Check probe location and connection.
Replace if necessary.
Clean condenser of all lint and dirt.
Check for air restriction to condenser.
Check with voltmeter.
Replace compressor.
Tighten if loose.
Replace motor(s)
Check Ice bank control using procedure in
Section 8. Replace control or probe if
defective.
Leak check, repair leak, charge with correct
amount of refrigerant.
Replace if not working.
Ventilate room or relocate chiller.
Find heat source and mitigate.
Consider upsizing or multiple chillers;
reduce python length.
Ventilate room or relocate chiller.
Consider upsizing or multiple chillers;
reduce python length.
Leak check and repair.
Clean off dust, lint, grease, etc.
Remove obstruction or replace motor.
Part No: 68000036
No. 111 – 4 Apr 22
Page 17 of 28