Sab 80 With Fitted (Mechanical) Oil Pump; Vmy Mk 2 And 2.5 With Built-In Oil Pump; Vmy Mk 3 Without Full Flow Pump - Johnson Controls SABROE Unisab III Control Engineering Manual

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 mini-
mum position. 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 seconds will result in a shutdown.
Alarm surveillance
During start the following alarms are delayed:
Low oil pressure
High filter diff. pressure
Low superheat
High superheat
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
High filter diff. pressure
Low superheat
High superheat
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 activated, the prelubrication period will start.
When the time period has expired, the compressor will start and the pump will run for 60 sec.
Engineering manual - Unisab III 1.10
001930 en 2014.09
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