Series 1 Portable Chillers, PLC Control
UGH017/0500
6-10
T
ROUBLESHOOTING
A
LARM
C
ONDITIONS
Alarm
ALM 03
Low Suction
Pressure alarm
Possible cause
No or low flow with a
failed flow switch and
RTD.
Compressor suction valve
is closed.
No load on the Chiller.
The Evaporator is fouled.
The evaporator is frozen.
There is a refrigerant
leak.
Faulty pressure transduc-
er.
Solution
❐
Check To Process and From
Process valves to see if they
are open.
❐
Check Flow switch and
RTD. Replace as needed.
Open valve.
Compare process load to
required load. Chiller may be
oversized.
Clean Evaporator. See
Cleaning the Evaporator or
Water-cooled Condense
r, in the
Maintenance section.
❐
Check flow switch, RTD,
temperature transmitter and
low temperature cutout on
temperature controller.
Replace as needed.
❐
Check PLC control for
proper percent ethylene gly-
col or propylene glycol solu-
tion. Change percent glycol
setpoint, if needed.
Check for oil in chiller cabinet
and bubbles in refrigerant sight
glass. Consult Conair Service
for repair.
See
Checking the Pressure
Transducer
, in the
Troubleshooting section.
