Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook page 179

[ VII Control ]
(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. BC controller solenoid valve control
6. BC controller LEV control
HWE09080
Heating operation
4-way valve ON
YES
Test run mode
ON
NO
NO
Thermostat
ON
YES
YES
3-minute restart
prevention
NO
1. Indoor-heat source 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
- 170 -
Normal operation
Unit in the stopped state
During test run mode
GB