Technical information

PLC C
ONTROL
ALARM
CONDITIONS
Alarm
Low Temperature
Cutout alarm
Possible cause
The hot gas bypass valve
is not working properly
(possibly stuck closed).
Fluid flow is insufficient.
Failed RTD or
Temperature Transmitter.
Hot Gas Bypass valve
relay failed.
Solution
If the To Process temperature
starts to go down, the solenoid
valve is faulty. Have a certified
refrigeration technician replace
the solenoid valve.
Check voltage to coil; replace
coil if needed.
Check for plugged pipes,
closed valves, or failed flow
switch.
See Checking the Temperature
Transmitter and RTD, in the
Troubleshooting section.
Replace as needed (see electri-
cal drawings.)
UGH024/1103 Portable Chillers
TROUBLESHOOTING
6-35