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Mitsubishi Electric PURY-HP72 Service Handbook page 153

R410a
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[5-4 Operation Flowcharts ]
(3) BC controller (cooling only, heating only, cooling main and heating main modes)
Protection function
self-holding cancelled.
Solenoid valves OFF
LEV Fully closed
Cooling Only
Note 1. The system may go into the error mode on either the indoor unit side or the BC controller or outdoor
unit side. If some of the indoor units are experiencing a problem, only those indoor units that are
experiencing the problem will stop. If the BC controller or the outdoor unit is experiencing a problem,
all the connected units will stop.
HWE13080
Start
Breaker
turned on
YES
3
NO
Operation
command
YES
1. Determination of operation mode
(Cooling only, Heating only, Mixture
of units in cooling and heating)
2. Transmitted to the outdoor unit
Reception of operation mode
command from the outdoor unit
*Note 1
Error mode
NO
Fan
Operation
mode
All units in the
same mode
Operation
mode
Heating Only
3
NO
YES
Mixture of units in cooling and heating
Operation
mode
Cooling Main
Heating Main
- 142 -
Normal operation
Error
Unit in the stopped state
Error command to
outdoor unit
Error stop
Self-holding of
protection function
Error command to
indoor unit
GB

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