ROTORCOMP NK 31 - Troubleshooting

10.1
[en] 02/2014
Installation and operating manual - NK 31
Fault Possible cause Remedy See chapter
Incorrect direction of
rotation
Phases reversed Reconnect 2 supply lines
System does not start No electricity Check
Combistat switches off
due to excessively high
temperature
Check oil level, cooling,
thermo-bypass
System difcult to start Motor output insufcient Check
Drive gear ratio „too fast“ Check
Star-delta switchover
incorrect
Set
Compressor is ooded
with oil
Check
System has not been
discharged yet
Check
Oil lling too viscous Check viscosity 8.1.1
Differential pressure Pressure in separator
cartridge too high with
clogged or full separator
cartridge
Replace separator
cartridge
7.5.2
Combistat switches
off due to excessively
high temperature
Oil shortage Check oil level in
oil reservoir and top up
if necessary
7.2
Oil lter soiled Replace oil lter cartridge 7.4.2
Thermostat defective Replace thermostat 3.10.2
Oil cooler soiled Clean oil cooler on air
side, clean on oil side if
necessary
Incorrect installation
a) Room ventilation
b) Exhaust air blocked
c) Thermal short circuit
Observe recommendation
on installing system
5.3
Combistat faulty or
incorrectly adjusted
Adjust combistat or
replace
Fan has failed Check
10 Troubleshooting