UGH017/0500
Series 1 Portable Chillers, PLC Control
T
ROUBLESHOOTING
6-11
A
LARM
C
ONDITIONS
CONT
’
D
Alarm
ALM 04
High Refrigerant
Discharge Pressure
alarm
Possible cause
Clogged/dirty air-cooled
condenser.
Blocked air flow to air-
cooled condenser.
Low condenser water
flow or water too warm
to water-cooled con-
denser.
Blocked condenser water
line or valve closed.
Condenser fouled.
Compressor discharge
valve closed (if supplied).
Overcharged with refrig-
erant.
Faulty water regulating
valve.
Faulty pressure transduc-
er.
Ambient air is over 95 °F.
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.
Clean the condenser. See
Cleaning the Air-cooled
Condenser
, and
Cleaning the
Evaporator or Water-cooled
Condenser
, in the Maintenance
section.
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.
