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(4) Cooling operation
YES
NO
YES
YES
NO
NO
1.Inverter output 0Hz
2.Indoor unit LEV, oil return LEV
3.Solenoid valve OFF
4.Outdoor unit fan stop
5.BC controller solenoid valve OFF
6.BC controller LEV fully closed
1.Inverter frequency control
2.Indoor unit LEV, oil return LEV
control
3.Solenoid valve control
4.Outdoor unit fan control
5.BC controller solenoid valve control
6.BC controller LEV control
Cooling operation
4-way valve OFF
Indoor unit fan
operations
Test run start
Thermostat ON
Normal operations
Test run
Stop
3-minute
restart
prevention