Operation Flowchart - Daikin RXQ12AHR Service Manual

SiAF341904E

1. Operation Flowchart

For detailed description of each function in the flow, refer to the details on related function on
the following pages.
Stop control
(1) Abnormal shutdown
(2) Slave unit stops during master unit operation
Standby control
(1) Restart standby
Startup control
(including pressure equalization before startup)
(1) Cooling startup control
Normal operation
(1) List of functions in normal operation
(2) Compressor capacity control
(3) Operating priority and rotation of
compressors
(4) Compressor step control
(5) Electronic expansion valve control
(6) Step control of outdoor fans
Protection control
(1) High pressure protection control
(2) Low pressure protection control
(3) Discharge pipe protection control
(4) Compressor body protection control
(5) Inverter protection control
Note(s)
1. In the event indoor unit stops or the thermostat turns OFF while in oil return operation, pump
down residual operation is performed on completion of the oil return operation.
Part 4 Functions and Control
Thermostat ON
Thermostat
ON
End of
startup
control
Conditions met for oil return
Operation Flowchart
Special control
Thermostat OFF
(1) Outdoor unit rotation
(2) Oil return operation (note 1)
(3) Inverter pre-heat operation
79