Panasonic Urban Multi MX1R Series Service Manual page 451

Outline of Control
Compressor Sequence Operation
Regarding operation of STD compressors in 3 compressor system, STD1 and STD2 are switched under
following condition.
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 +
„ Regarding the above operation timing, the inverter compressor is set to the above frequency (41 Hz)
„ The STD compressor does not start for 3 seconds if the STD compressor of another outdoor units
[When STD compressor is turned off]
„ The frequency of the inverter compressor changes after the STD compressor stops operation.
430
INV
INV
INV
INV
INV
ON (+ON) is fixed for 30 seconds.
first, then the STD compressor is started.
(Operation starts when frequency matching signal from inverter is received.)
starts.
INV
INV
INV
INV
Continue
Function UM Combination "MA1R Series" Using R-407C
PACD011001C2
(V0914)