Daikin FUYP125BV1 [210/397] Normal outdoor fan control in cooling operation

Daikin FUYP125BV1 [210/397] Normal outdoor fan control in cooling operation
Overview of the cooling mode functions ESiEN02–01A
2–32 Part 2 Functional Description
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1
2
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2.5 Normal Outdoor Fan Control in Cooling Operation
Applicable units R(Y)P71-250B
Purpose The purpose of this normal outdoor fan control is to ensure a correct discharge pressure in function of
the outdoor air and indoor room temperature.
Method The table below shows in which conditions the outdoor fan works at low or high speed.
Ta = ambient temperature = outdoor air temperature; Tr = room suction temperature.
Different fan
speeds
The table below explains the meaning of L, H and HH fan speed.
Used input The normal outdoor fan control during cooling operation uses the following inputs:
Condition Fan Speed
Ta < 41.7 - 0.84 x Tr L
Ta > 45.7 - 0.84 x Tr H
Fan operation
71 100 and 125 200 and 250
1 fan
Upper fan
(MF1)
Lower fan
(MF2)
Fan 1 Fan 2
OFF OFF OFF OFF OFF OFF
L LLLHOFF
H HHHHH
HH HH HH HH H H
Input
Connection on
indoor PCB
Connection on
outdoor PCB
Indoor room temperature R1T X19A
Outdoor air temperature R1T X4A

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