Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 155

[ VII Control ]
(2) Heating operation
1. Indoor unit fan operation at
Very Low speed
2. Inverter output 0Hz
3. Indoor unit LEV, LEV1 Fully closed
4. All solenoid valves OFF
5. 52C OFF
Heating operation
4-way valve ON
YES
Test run mode
ON
NO
NO
Thermostat ON
YES
YES
3-minute restart
prevention
NO
1. Indoor unit fan control
2. Inverter frequency control
3. Indoor unit LEV, LEV1 control
4. Solenoid valve control
5. 52C control
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Normal operation
Unit in the stopped state
During test run mode