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Mitsubishi Electric PURY-HP72 Service Handbook page 155

R410a
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[5-4 Operation Flowcharts ]
(2) Heating operation
1. Indoor unit fan operation at
Very Low speed
2. Inverter output 0Hz
3. Indoor unit LEV fully open
4. Solenoid valve OFF
5. Outdoor unit fan stop
6. BC controller solenoid valve control
7. BC controller LEV control
1) When the outdoor unit goes into the defrost mode, defrost command is sent to the BC controller and indoor units. Upon re-
ception of the command, the indoor units will go into the defrost mode. When defrosting is completed and upon receiving the
signal that indicates the completion of defrosting, indoor units will resume the heating operation.
2) Defrost end condition: 10 minutes have passed since defrost operation started.
Outdoor unit pipe temperature: Refer to the following page(s).[5-2-7 Defrost Operation Control](page 127)
HWE13080
Heating operation
*Note 1,2
Defrost
operation
NO
4-way valve ON
YES
Test run mode
ON
NO
NO
Thermostat
ON
YES
YES
3-minute restart
prevention
NO
1. Indoor/outdoor unit fan control
2. Inverter frequency control
3. Indoor unit LEV fully open
4. Solenoid valve control
5. BC controller solenoid valve control
6. BC controller LEV control
1
3
- 144 -
Normal operation
Defrost operation
Unit in the stopped state
During test run mode
4-way valve OFF
1. Indoor unit fan stop
2. Inverter defrost frequency control
3. Indoor unit LEV fully open
4. Solenoid valve control
5. Outdoor unit fan stop
6. BC controller solenoid valve control
7. BC controller LEV control
*Note 1,2
NO
Stopping the
defrost operation
YES
Stopping the defrost operation
GB

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