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0%
50%
100%
0%
50%
100%
C2
C1
C2
C1
Dead zone / 2
Room Temp.
Summer
Setpoint
Winter
Setpoint
Differential
Differential
0%
25%
50%
75%
100%
0%
25%
50%
75%
100%
C4
C3
C2
C1
C1
C2
C3
C4
Dead zone / 2
Room Temp.
Summer
Setpoint
Winter
Setpoint
Differential
Differential
9
SysAer
Operation with 2 Compressors (1/2 circuit) with proportional (P) regulation
Operation with 4 Compressors (2 circuits) with proportional (P) regulation
The compressors rotation is managed according to the circuits (in the case of a 2-circuits configuration) and
the compressors status.
The circuits and the compressors of each circuit rotation follows FIFO (First In First Out) logic, i.e. the first
circuit to switch ON will be the first to switch OFF and the first compressor of one circuit to switch ON will
be the first to switch OFF.
When a compressor is requested to start, the following conditions are observed:
The first circuit to stop will be the first to start.
In the selected circuit, the compressor that has been OFF for a longer time will be the first one to switch ON.
The first compressor to switch ON is the first one to switch OFF.
A compressor will switch ON again, not before all the other compressors have started.
In standard operation, Summer Setpoint = 24°C, Summer Differential = 2°C, Winter Setpoint = 21°C, Winter
Differential = 2°C.
3.3. COMPRESSOR CONTROL
3.3.1. COMPRESSOR ROTATION
The number of compressors and circuits depends on unit configuration.
Compressors ON/ OFF is controlled by the room air temperature (RAT).
The compressors will not work as long as they are locked in the Service menu (P1 and P2).
