4 Operation / Normal use
4 - 12
4.6 Remedying malfunctions in normal operation (continuation)
Fault
Possible Cause
Remedy
Motor overload
tripping (therm.
overcurrent relay)
has stopped the
system
•
Blocked
system
•
Phase failure
•
Motor over-
loaded
•
Ambient tempe-
rature too high
Eliminate reason for
seizure
Check supply line
Check and adjust
overload setting;
check and adjust dis-
charge pressure
switch setting
Ensure adequate
ventilation
Combistat cuts out
due to excessively
high temperature
•
Insufficient oil
•
Oil filter clogged
•
Oil thermostat
defective
•
Oil cooler dirty
•
Compressor in-
correctly installed
•
Combistat defec-
tive or incorrectly
set
Check and adjust oil
level
Change oil filter
Replace oil thermos-
tat
Clean oil cooler (air
or oil side)
Refer to recommen-
dations for installation
Adjust or replace
Combistat
Safety valve blows
•
Safety valve de-
fective
•
Oil separator
cartridge clogged
Change safety valve
Change separator
cartridge
Continued overleaf
Malfunctions
(contd.)