Four Way Valve Control; Outdoor Fan Control - Daikin FTKB09AXVJU Service Manual

Applicable for PCB W_2_04A & W_2_04B (For all class 18/24)

2.16 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
Heat, except for defrost
Cool
Dry
Defrost

2.17 Outdoor Fan Control

a) Fan ON control to cool down the electrical box
The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF.
b) Fan OFF control during defrosting
The outdoor fan is turned OFF during defrosting
c) Fan OFF delay when stopped
The outdoor fan is turned OFF 60 – 70 seconds after the compressor stops
d) Fan speed control for pressure difference upkeep
The rotation speed of the outdoor fan is controlled for keeping the pressure difference during cooling
operation with low outdoor temperature
• When the pressure difference is low, the rotation speed of the outdoor fan is reduced
• When the pressure difference is high, the rotation speed of the outdoor fan is controlled as well as normal
operation
e) Fan speed control during forced cooling operation
The outdoor fan is controlled as well as normal operation during forced cooling operation
f) Fan speed control during POWERFUL/TURBO operation
The rotation speed of the outdoor fan is increased during POWERFUL/TURBO operation
g) Fan speed control during indoor unit quiet operation
The rotation speed of the outdoor fan is reduced by the command of the indoor unit quiet operation
h) Fan ON/OFF control when operation (cooling, heating, dry) starts/stops
The outdoor fan is turned ON when the operation starts. The outdoor fan is turned OFF when the operation
stops
4-way valve is
ON
OFF
Algorithm & Control
Cut off the jumper
J_AUTO to disable
the Auto Restart or
Auto Random Restart
function
24