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USER MANUAL – Release 1.2 of 01/01/2010
Page 101 of 191
Version: 02/03/2010
26. COMPRESSORS TEMPERATURE CONTROL ROTATION CONTROL
Manages working of the compressors in cooling and heating unit in up to 4 circuits with a maximum of 4
compressors per circuit.
Notes
The function manages the rotations and the switch-on/off times of the compressors of a unit with 4 circuits
and 4 compressors per circuit. The unit controlled can be equipped with:
•
unloading;
•
partialised compressors:
•
heat recovery;
•
pump down;
•
defrost (therefore heating unit);
26.1 FIXED SEQUENCE IN SELECTION OF THE CIRCUITS
The switch-on sequence is according to the increasing order of the circuits. Switch-off follows the sequence
opposite to switch-on.
26.2 FIXED SEQUENCE INSIDE THE CIRCUIT
The switch-on sequence is according to the increasing order. Switch-off follows the sequence opposite to
switch-on.
26.3 COMPRESSOR FIFO ROTATION
This procedure manages start-up and stopping of all compressors inside the circuit according to
FIFO logic
,
i.e. the first compressor started in the case of a cooling request will be the first to stop when the request
ends. At the successive request the compressor at a standstill for the longest time will be started-up.
26.4 CIRCUIT FIFO ROTATION
This procedure manages start-up and stopping of all circuits according to
FIFO logic
, i.e. the first circuit
started in the case of a cooling request will be the first to stop when the request ends. At the successive
request the circuit at a standstill for the longest time will be started-up.
26.5 SELECTION OF THE CIRCUIT FOR BALANCING
Balancing the circuits, the power steps are on in a way that the circuits distribute the same power.
Switch-on:
the circuit is selected which in that moment has the least number of resources engaged.
If the resources used are the same, the circuit is selected that can switch the compressor on with the least
"n° of working hours" or least "n° of peaks per hour".
Switch-off:
the circuit is selected which in that moment has the greatest number of resources engaged.
If the resources used are the same, the circuit is selected that can switch the compressor off with the
greatest "n.
26.6 SELECTION OF THE COMPRESSOR FOR BALANCING
The compressors are
only
balanced in the presence of partialised compressors.
Switch-on:
the compressor is selected which in that moment has the least number of resources engaged.
If the resources used are the same, the compressor is selected with the least "n° of working hours" or least
"n° of peaks per hour".
Switch-off:
the compressor is selected which in that moment has the greatest number of resources engaged.
If the resources used are the same, the compressor is selected with the greatest "n° of working hours" or
greatest "n° of peaks per hour".
