Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 169

[ VII Control ]
-17- Control Method <PURY>
Autonomous distributed control system : A system that consists of three independent sub control systems,
Data signal exchange
between system equipment
Calculation, processing
System control
Adjustment of refrigerant flow rate
Adjustment of rotation speed of
compressor or fan
Rotation speed control of compressor
or fan depending on the refrigerant
pressure value and the changing speed
Self-contained capacity control depending
on the load
Refrigerant distribution control depending
on the operation mode
instead of a single centralized control system, that work together
to maintain the overall control of the entire system.
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Daisy-chained
Non-polar 2-wire
non-polar 2-wire
serial communication
method
transmission line
16-bit CPU
microcomputer operation
processing
*
Autonomous distributed
control system
(F2-VPM control)
Outdoor unit
Indoor unit
BC controller