Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 166

[ VII Control ]
-14- Control Method <PQRY only>
The control system configuration for the PQRY models is shown in the chart below.
Autonomous distributed control system : A system that consists of three independent sub control systems,
HWE15150
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)
Heat source unit
Indoor unit
BC controller
GB