Indoor Unit (RA Models)
SiENBE18-621
86
Function
7.2
Fan Speed Control for Indoor Units
Control Mode
The airflow rate can be automatically controlled depending on the difference between the set
temperature and the room temperature. This is done through phase control and Hall IC control.
For more information about Hall IC, refer to the troubleshooting for fan motor on page 273.
Phase Steps
Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H and HH.
= Within this range the airflow rate is automatically controlled when the FAN setting
button is set to automatic.
Note:
1. During powerful operation, fan rotates at H tap + 50 - 90 rpm.
2. Fan stops during defrost operation.
Automatic Air
Flow Control for
Heating
The following drawing explains the principle for fan speed control for heating:
Automatic Air
Flow Control for
Cooling
The following drawing explains the principle of fan speed control for cooling:
Step
Cooling
Heating
Dry mode
LLL
20 · 25 · 35kW class :
670 - 880 rpm
(During powerful operation :
720 - 930 rpm)
50 · 60 · 71kW class :
750 - 1000 rpm
(During powerful operation :
1050 rpm)
LL
SL (Silent)
L
ML
M
MH
H
HH (Powerful)
(R2818)
(R2818)
-1.5°C
-1.5°C
-0.5°C
-0.5°C
-1°C
-1°C
-2°C
-2°C
L
ML
M
(R459
3
)
DC motor: Rot
a
tion
s
peed control
AC motor: Ph
as
e control
Thermo
s
t
a
t
s
etting
temper
a
t
u
re
Difference
b
etween room
a
nd
s
et temper
a
t
u
re
f
a
n
s
peed
+1.5°C
+1.5°C
+0.5°C
+0.5°C
+2°C
+2°C
+1°C
+1°C
M
ML
L
(R4594)
DC motor: Rot
a
tion
s
peed control
AC motor: Ph
as
e control
Difference
b
etween room
a
nd
s
et temper
a
t
u
re
Thermo
s
t
a
t
s
etting
temper
a
t
u
re
f
a
n
s
peed
Summary of Contents for BPMKS967B2B
Page 1: ...SiENBE18 621 E Series Service Manual Applied Models Super Multi Plus Heat Pump...
Page 12: ...SiENBE18 621 List of Functions 1 Part 1 List of Functions 1 List of Functions 2...
Page 19: ...List of Functions SiENBE18 621 8 List of Functions...
Page 33: ...Specifications SiENBE18 621 22 Specifications...
Page 69: ...Refrigerant Flow for Each Operation Mode SiENBE18 621 58 Refrigerant Circuit...
Page 121: ...Indoor Unit SkyAir Models SiENBE18 621 110 Function...
Page 169: ...Instruction SiENBE18 621 158 System Configuration FTXS 20 25 35C Indoor Unit...
Page 371: ...Method of Replacing The Inverter s Power Transistors Modules SiENBE18 621 360 Troubleshooting...
Page 393: ...SiENBE18 621 vi Index...