![background image](http://html1.mh-extra.com/html/daikin/sky-air-r-407c/sky-air-r-407c_service-manual_4700473210.webp)
Overview of the cooling mode functions
ESIE02–01
2–30
Part 2 – Functional Description
3
1
2
4
5
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:
Fan speed = 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
Summary of Contents for Sky Air R-407C
Page 1: ...ESIE02 01 Service Manual Sky Air R 407C B series SV p p p...
Page 2: ......
Page 3: ...ESIE02 01 Service Manual Sky Air R 407C B series SV p p p...
Page 4: ......
Page 16: ...Introduction ESIE02 01 xii 3 1 4 5...
Page 18: ...ESIE02 01 1 2 Part 1 System Outline 3 1 1 5...
Page 42: ...General Outline Outdoor Units ESIE02 01 1 26 Part 1 System Outline 3 1 1 4 5...
Page 49: ...ESIE02 01 General Outline Indoor Units Part 1 System Outline 1 33 3 1 4 5...
Page 72: ...General Outline Indoor Units ESIE02 01 1 56 Part 1 System Outline 3 1 1 4 5...
Page 86: ...Specifications ESIE02 01 1 70 Part 1 System Outline 3 1 1 4 5...
Page 110: ...ESIE02 01 1 94 Part 1 System Outline...
Page 130: ...Switch Box Layout ESIE02 01 1 114 Part 1 System Outline 3 1 1 4 5...
Page 180: ...PCB Layout ESIE02 01 1 164 Part 1 System Outline 3 1 1 4 5...
Page 182: ...ESIE02 01 2 2 Part 2 Functional Description 3 1 2 5...
Page 204: ...General Functionality ESIE02 01 2 24 Part 2 Functional Description 3 1 2 4 5...
Page 216: ...Overview of the cooling mode functions ESIE02 01 2 36 Part 2 Functional Description 3 1 2 4 5...
Page 232: ...ESIE02 01 3 2 Part 3 Troubleshooting 3 1 3 5...
Page 294: ...Error Codes System Malfunctions ESIE02 01 3 64 Part 3 Troubleshooting 3 1 3 4 5...