Daikin FXYBP20K7V1, Service Manual

Page: 61 / 193

Outline of Control (Outdoor Unit) SiE 00-07
50 Function R-407C PLUS Series
3.5.2 Compressor Sequence Operation
Regarding operation of STD compressors in 3 compressor system, STD1 and STD2 are switched under
following condition.
3.5.3 STD Compressor Operation
Since ON/OFF switching of STD compressors causes a sudden change in the capacity, therefore the
following operation is conducted.
[When STD compressor is turned on]
When a STD compressor changes from OFF to ON due to the compressor PI control or others, 41 Hz +
ON (+ON) is fixed for 30 seconds.
Regarding the above operation timing, the inverter compressor is set to the above frequency (41 Hz)
first, then the STD compressor is started.
(Operation starts when frequency matching signal from inverter is received.)
The STD compressor does not start for 3 seconds if the STD compressor of another outdoor units
starts.
[When STD compressor is turned off]
The frequency of the inverter compressor changes after the STD compressor stops operation.
INV
INV
INV
INV
INV
INV
INV
INV
INV
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(V0914)