Daikin FTXC60A - Four Way Valve Control; Outdoor Fan Control; Rotation Regulating Functions

Algorithm & Control
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2.14 Four Way Valve Control
Change over switching is only carried out during operation.
OFF delayed is applied when the coil switches from ON to OFF
Operating mode 4-way valve is
Heat, except for defrost ON
Cool
Dry
Defrost
OFF
2.15 Outdoor Fan Control
Determine from
• Compressor target rotation: higher fan speed with higher rotation.
• Outdoor air temperature.
Cool mode: Higher fan speed with higher outdoor air temperature.
Heat mode: Higher fan speed with lower outdoor air temperature.
When compressor stops, fan OFF delay of 30 seconds is carried out
2.16 Rotation Regulating Functions
Upper limit rotation
Limit rotationCommand rotation
Starting rotation
∆T
Defrost*
Lower limit rotation
Target rotation
* Defrost control for heat pump model only
2.16.1 Starting Rotation
Starting Control
To avoid excessive oil discharge from compressor or to promote oil lubrication during startup.
Topreventliquidoodbacktothecompressor.
To limit starting current.
When compressor starts to rotate from OFF to ON, compressor rotation is set to run gradually to each upper
limitataspecictimersetting.
Compressor
rotation, f
Time (min)
d
c
b
a
1 2