Technical information

PLC C
ONTROL
ALARM
CONDITIONS
Alarm
High Temperature
Temp > 75°F for
5 min alarm
High Discharge
Temperature alarm
(models 3.5 and 5
HP models only)
Possible cause
Load too high for chiller.
Refrigeration circuit not
working properly.
Compressor malfunc-
tioned.
Refrigeration charge low.
Temperature sensor is
faulty (for A/W2-3.5 and
A/W2-5 models only).
Solution
Reduce load on chiller; if not
able to reduce load, choose a
chiller with more capacity.
Check refrigerant circuit. See
Checking Refrigerant Charge,
in the Installation section.
Check voltage to compressor.
Check contact points on con-
tactor. Replace if needed.
Check temperature on suction
line; it should be less than 60
°F. Check refrigerant sight
glass for bubbles. Charge with
refrigerant if needed.
Replace temperature sensor
mounted on the discharge side
of the compressor (trip point is
260 °F).
UGH024/1103 Portable Chillers
TROUBLESHOOTING
6-37