Technical information

Portable Chillers UGH024/1103
6-30 TROUBLESHOOTING
Alarm
Low Suction
Pressure alarm
Possible cause
No or low flow with a
failed flow switch and
RTD.
Compressor suction valve
is closed.
The Evaporator is fouled.
Evaporator frozen.
Faulty TXV solenoid.
Refrigerant leak.
Faulty pressure transduc-
er.
Condenser air or water
too cold.
Wiring incorrect.
Solution
Check To Process and From Process
valves to see if they are open. Check
Flow switch and RTD. Replace as need-
ed.
Open valve.
Clean Evaporator. See Cleaning the
Evaporator or Water-cooled Condenser, in
the Maintenance section.
p Check flow switch, RTD, tempera-
ture transmitter and low temperature
cutout on temperature controller.
Replace as needed.
p Check PLC control for proper per-
cent ethylene glycol or propylene gly-
col solution. Change percent glycol set-
point, if needed. Add glycol if needed.
Check wiring, voltage, coil and relay (see
electrical drawings); replace as needed.
Check for oil in chiller cabinet and bub-
bles in refrigerant sight glass. Consult
Conair Service for repair.
See Checking the Pressure Transducer, in
the Troubleshooting section.
Check air/water temperature. Water
should be 65 F or higher; air temperature
should be 60 F or higher.
Use wiring diagrams and check wiring.
Correct as needed.
PLC CONTROL
ALARM
CONDITIONS