Daikin FH35BZV1 [208/397] Outdoor fan starting control in cooling or dry keep mode

Daikin FUYP100BV1 [208/397] Outdoor fan starting control in cooling or dry keep mode
Overview of the cooling mode functions ESiEN02–01A
2–30 Part 2 Functional Description
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2.4 Outdoor Fan Starting Control in Cooling or Dry Keep Mode
Applicable units R(Y)P71-250B
R35-45EZ7V11
RY35-45E(A)Z7V1
Purpose The purpose is to avoid that the discharge pressure would start to rise, and stop the unit.
Unit specifications:
R35-45EZ7V11 and
RY35-45E(A)Z7V1
R35-45EZ7V11 has a mechanical thermostat.
RY35-45E(A)Z7V1 has an air thermistor and a low-high speed shift.
Method:
R35-45EZ7V11 and
RY35-45E(A)Z7V1
When the compressor starts, the fan keeps running at starting fan speed (no delay). The fan speed
depends on the ambient temperature. The different fan speeds for the according outdoor air
temperatures are shown in the table below.
Method:
R(Y)P71-250B
When the compressor starts, the fan keeps running for 3 min at starting fan speed. The starting fan
speed depends on the ambient temperature. The different fan speeds for the according outdoor air
temperatures are shown in the table below.
Fan speed for
Ta < 3°C:
R(Y)P71-250B
This fan starting control is made to be able to build up the compression ratio as soon as possible
because this has two advantages:
It is better for the compressor to increase the compression ratio because the lubrication must be
done by the pressure difference between low and high pressure.
The pressure difference is necessary for the h/p models to keep the 4-way valve in its correct
position.
Operating mode Outdoor air temperature Ta Starting fan speed
Cooling mode, dry keep mode Ta > 20°C H speed
Ta < 17°C L speed
Operating mode
Outdoor air temp.
Ta
Starting fan speed
See further in this
section...
Cooling mode,
dry keep mode
Ta < 3°C
When the compressor is
ON for the first 20 s:
Fanspeed=OFF
After 20 s:
Fan speed = L speed
Fan speed for
Ta < 3°C:
R(Y)P71-250B
3°C Ta < 10°C L speed Different fan speeds
10°C Ta < 23°C H speed
Ta 23°C HH speed

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