Johnson Controls SABROE UniSAB III - Page 136

Engineering manual - UniSAB III 1.10.8
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001930 en 2021.06
Compressor control and surveillance
Table 30 shows CMO VSD cylinder unloading configuration with the Centa coupling. Percentages
shown are the capacity at maximum speed.
Cylinders
2 3 4
5
6 8
Compressor
CMO/HPO 24
Digital output
DO10 DO11
100%
1
DO12
CMO/HPO 26
Digital output
-
50%
2
DO10
DO11
100%
1+2
DO12
CMO/HPO 28
Digital output
-
50%
2
DO10
TPV (1)
DO11
100%
1+2
+DO12
TCMO 28
Digital output
-
33%
2
DO09
DO10 DO11
100%
1+2
+DO12
Table 30: CMO VSD cylinder unloading configuration with Centa coupling
The digital output and solenoid valves which must be activated to provide capacity control are emphas-
ised with bold letters.
The thermo pump TPV connection for the high cylinder part is also shown in Table 30. The TPV connec-
tion has not been changed - it is the same as for the standard compressor.
The thermo pump high cylinder part step is however only mechanically available for CMO/HPO 28. VSD
Total unloading will at first not be mechanically available for CMO/HPO/TCMO.
*) Note that with VSD unloading, output DO09 will correspond to 33% (2+2 cylinders) as for a standard
TCMO 28.