In the maintenance picture Service/Maintenance/Maintenance Compr. you will find the follow-
ing information:
Service counter
The total number of hours this compressor has been running since the last main C service has
been performed.
Main service C
The calculated estimated number of running hours between the two main C services.
If manual service is selected Main service C is set equal to Service interval C.
If automatic service is selected Main service C is calculated on the basis of how the compres-
sor has been operating since last main service, i.e. discharge pressure, suction pressure, ro-
tating speed and the number of starts/stops.
Next main service C
This is the calculated estimated number of running hours until the compressor needs the next
main service C.
This service interval is calculated as Main service C minus the running hours since last service
C.
Next sub-service B
This is the calculated estimated number of running hours until the compressor needs the next
service B. If next sub-service B is scheduled to be performed at the same time as the Main
service, the sub-service B will not be shown. The service B hour field will be blank, i.e. “--”.
This sub-service interval is calculated as Main service C / 2 minus the running hours since last
service B.
Next sub-service A
This is the calculated estimated number of running hours until the compressor needs the next
service A. If next sub-service A is scheduled to be performed at the same time as the Main
service or the sub-service B, the sub-service A will not be shown. The service A hour field will
be blank, i.e. “--”.
For screw compressors, this sub-service interval is calculated as Main service C / 6 minus the
running hours since last service A.
For reciprocating compressors this sub-service interval is calculated as Main service C / 4 mi-
nus the running hours since last service A.
Service
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Engineering manual - Unisab III 1.10
001930 en 2014.09
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