Mitsubishi Electric CITY MULTI PQRY-P200YMF-B Service Handbook page 63

(5) Heating operation
1. Indoor unit fan very low speed
operations
2. Inverter output 0Hz
3. Indoor unit LEV, oil return LEV
(SLEV), INV cooling LEV (LEV2)
fully closed
4. Solenoid valve OFF
5. BC controller solenoid valve
OFF
6. BC controller LEV fully closed
Heating operation
NO
4-way valve ON
Test run start
NO
NO
Thermostat ON
YES
YES 3-minute
restart
prevention
NO
1. Indoor and heat source unit fan
control
2. Inverter frequency control
3. Indoor unit LEV, oil return LEV
(SLEV), INV cooling LEV (LEV2)
control
4. Solenoid valve control
5. BC controller solenoid valve
control
6. BC controller LEV control
–60–
Normal operations
Stop
Test run
YES