Technical information

PLC C
ONTROL
ALARM
C
ONDITIONS
Alarm
High Discharge
Pressure alarm
Possible cause
Clogged/dirty air-cooled con-
denser.
Blocked air flow to air-cooled
condenser.
Low condenser water flow or
water too warm to water-
cooled condenser.
Blocked condenser water line
or valve closed.
Condenser fouled.
Fan motor not running.
Faulty liquid line solenoid
valve.
Compressor discharge valve
closed (if supplied).
Overcharged with refriger-
ant.
Faulty water regulating
valve.
Faulty pressure transducer.
Input wiring to PLC incor-
rect.
Solution
Clean the coil. See Cleaning the Air-
cooled Condenser, in the Maintenance
section.
Move chiller or unblock air passageway.
Check required flow; see Specifications in
the Description section.
Unblock line; open valve. Check and
clean filter strainer.
Clean the condenser. See Cleaning the
Air-cooled Condenser, and Cleaning the
Evaporator or Water-cooled Condenser, in
the Maintenance section.
Check fan cycling operation settings.
Motor may be bad. See Drive manual
electrical information accompanying this
user guide.
Check voltage. Replace valve as needed.
Open valve.
See Checking the Refrigerant Charge, in
the Maintenance section.
Repair or replace the valve.
See Checking the Pressure Transducer, in
the Troubleshooting section.
Check wiring diagrams and compare to
wiring to PLC; correct as needed.
UGH024/1103 Portable Chillers
TROUBLESHOOTING
6-31