Control For 6/8 Hp Outdoor Unit; Operation Flowchart - Daikin VRV S RXQ4/5ARV1 Service Manual

Control for 6/8 HP Outdoor Unit

2. Control for 6/8 HP Outdoor Unit
2.1

Operation Flowchart

For detailed description of each function in the flow below, refer to the details on related function
on the following pages.
Stop control
(1) Abnormal shutdown
Standby control
(1) Restart standby
(2) Crankcase heater control
Startup control
(include pressure equalization before startup)
(1) Cooling 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) Overload protection control
Note(s)
1. If the indoor unit stops or the thermostat turns OFF while in oil return control, pump down
2. Not performed during cooling mode.
68
Thermostat ON
End of
startup
control
Conditions met for oil return
residual operation is performed on completion of the oil return operation.
Special control
(1) Pump down residual control
(note 2)
(2) Oil return control (note 1)
Part 4 Functions and Control
SiAF332111E