Technical information

Symptom
The control is lit and
there is no alarm
condition. The com-
pressor hums, but
does not run.
Possible cause
The input voltage is
incorrect
There is a phase loss.
Solution
Check the main supply volt-
age. It must be within 10% of
the nameplate rating.
p Check the fuses on the
main power supply. Replace or
reset as required. See
Replacing Fuses, in the
Troubleshooting section.
p Check the phase-to-phase
voltages.
p Check phase continuity
through the compressor con-
tactor.
p Check the wiring at the
compressor.
PLC C
ONTROL
PROBLEMS
CONT’D
UGH024/1103 Portable Chillers
TROUBLESHOOTING
6-27