Operation Flowchart
SiME332106E
50
Part 4 Functions and Control
Note(s)
1. Operation Flowchart
For detailed description of each function in the flow below, refer to the details on related function
on the following pages.
1. If the indoor unit stops or the thermostat turns OFF while in oil return control or defrost
control, pump down residual operation is performed on completion of the oil return operation
or defrost control.
2. Not performed during cooling mode.
Stop control
(1) Abnormal shutdown
(2) When system is in stop control
Standby control
(1) Restart standby
(2) Crankcase heater control
Startup control
(include pressure equalization before startup)
(1) Cooling startup control
(2) Heating startup control
Normal control
(1) List of functions in normal control
(2) Compressor control
(3) Compressor capacity control
(4) Compressor step control
(5) Electronic expansion valve control
(6) Step control of outdoor unit fans
Protection control
(1) High pressure protection control
(2) Low pressure protection control
(3) Discharge pipe protection control
(4) Inverter protection control
(5) Heating operation prohibition
(6) Overload protection control
Thermostat ON
End of
startup
control
Abnormality
Thermostat OFF
Conditions met for oil return
Special control
(1) Pump down residual control
(note 2)
(2) Oil return control (note 1)
Conditions met for defrosting
(3) Defrost control (note 1)
