Hitachi RAS-10FSXN - Standard Operation Sequence

RAS-(28-36)FSXN
Outdoor unit 1 Outdoor unit 2
-I- -C- -I- -C-
Last time 1 3 2 4
Currently 2 4 1 3
Next time 1 3 2 4
-I- Inverter compressor
-C- Constant compressor
RAS-(38-42)FSXN
Outdoor unit 1 Outdoor unit 2 Outdoor unit 3
-I- -C- -I- -I-
Last time 1 4 2 3
Currently 2 4 3 1
Next time 3 4 1 2
-I- Inverter compressor
-C- Constant compressor
RAS-(44-48)FSXN
Outdoor unit 1 Outdoor unit 2
Outdoor unit
3
-I- -C- -I- -C- -I-
Last time 1 4 2 5 3
Currently 2 4 3 5 1
Next time 3 5 1 4 2
-I- Inverter compressor
-C- Constant compressor
RAS-(50-54)FSXN
Outdoor unit 1 Outdoor unit 2 Outdoor unit 3
-I- -C- -I- -C- -I- -C-
Last time 1 4 2 5 3 6
Currently 2 5 3 6 1 4
Next time 3 6 1 4 2 5
-I- Inverter compressor
-C- Constant compressor
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Compressor frequency control
Operational
control is carried out to optimise the compressor output frequency or to carry out the turning on and stopping
while in constant operation in accordance with the target frequency (the target frequency is determined by the calculation
of the PID control and the heating and cooling load).
Therefore, when the load is small, the constant compressor may not operate.
5 Control system
90
SMGB0065 rev. 1 - 12/2010