Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
105/346
Compressor control and surveillance
3.3.7 SAB 80 with fitted (mechanical) oil pump
Starting sequence
When the compressor has received starting permission, check if the capacity slide is in minimum posi-
tion. Before starting the compressor, the oil level switch in the oil separator must be activated.
Start the compressor.
After a delay of 60 seconds from compressor start, no signal from the level switch for more than 10 sec-
onds will result in a shutdown.
Alarm surveillance
During start the following alarms are delayed:
Low oil pressure 45 sec.
High filter diff. pressure
300 sec.
Low superheat 300 sec.
High superheat 300 sec.
Low/high oil temperature
300 sec.
See also section 6.5 Timers.
3.3.8 VMY Mk 2 and 2.5 with built-in oil pump
Once the compressor has received starting permission, the pump will start. Make sure that the capacity
slide is in minimum position.
The compressor will start working.
The pump will run for 60 seconds and stop.
Alarm surveillance
During start the following alarms are delayed:
Low oil pressure 45 sec.
High filter diff. pressure
300 sec.
Low superheat 300 sec.
High superheat 300 sec.
Low/high oil temperature
300 sec.
See also section 6.5 Timers.
3.3.9 VMY Mk 3 without full flow pump
Once the compressor has received starting permission, the oil pump will start. Check that the capacity
slide is in minimum position.
The oil is pumped into the compressor lubrication system. As soon as the oil flow switch has been acti-
vated, the prelubrication period will start.
When the time period has expired, the compressor will start and the pump will run for 60 sec.
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