4-2-5 Compressor Sequence Operation
04-04
(1) Starting and stop control of the outdoor unit is performed by starting sequence and stop sequence
of the compressor. (Example: Three 14HP outdoor units are connected.)
But the following conditions shall be fulfilled.
(1-1) DC inverter scroll compressor is not placed in the sequence.
(1-2) If the DC inverter scroll compressor is in operation, the constant speed scroll compressor that starts first
and stops last has to be the one in the master unit.
(1-3) Difference in unit of operated compressor between the outdoor units is below 1 unit.
(1-4) Total capacity of operation of the master unit > Total capacity of operation of the slave compressor.
Master Slave1 Slave2
Starting sequence
Stop sequence
1 6 2 4 7 3 5 8
0 0 0 0 0 0 0 0
Master Slave1 Slave2
Starting sequence
Stop sequence
0 5 1 3 6 2 4 7
1 0 0 0 0 0 0 0
Master Slave1 Slave2
Starting sequence
Stop sequence
0 3 0 1 4 0 2 5
3 0 1 0 0 2 0 0
Master Slave1 Slave2
Starting sequence
Stop sequence
0 2 0 0 3 0 1 4
4 0 1 3 0 2 0 0
Master Slave1 Slave2
0 3 5 0 2 0 1 4
3 0 0 2 0 1 0 0
Master Slave1 Slave2
Starting sequence
Stop sequence
0 1 0 0 2 0 0 3
5 0 1 3 0 2 4 0
Master Slave1 Slave2
Starting sequence
Stop sequence
0 0 0 0 0 0 0 1
2 7 1 4 6 3 5 0
Master Slave1 Slave2
Starting sequence
Stop sequence
0 0 0 0 0 0 0 0
3 8 1 4 6 2 5 7
Master Slave1 Slave2
Starting sequence
Stop sequence
0 0 0 0 1 0 0 2
1 6 2 4 0 3 5 0
Master Slave1 Slave2
Starting sequence
Stop sequence
0 4 0 2 5 1 3 6
2 0 1 0 0 0 0 0
Put off the sequence
by (1-2)
Move forward the
sequence by (1-3)
Switch in sequence by (1-4)
Switch in sequence by (1-3)
Compressor stops
* Exception
Cooling : When 2 compressors of Master are operating,
and high pressure is high, constant speed
compressor of Slave is started.
Heating : When 2 compressors of Master are operating,
and low pressure is low, constant speed
compressor of Slave is started.
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