AH-X127E
AU-X127E
AY-X127E
AE-X127E
20
1-2 Indoor fan control
This control uses the thermistor for the indoor heat
exchanger to control cold air blowing prevention, the
indoor fan, and overheating prevention.
(1) Control for indoor overheating prevention
If the temperature of the indoor heat exchanger
exceeds the overheating prevention line during
heating due to the operating frequency or the nature
of the operation, this control lowers the frequency
by 4 to 15 Hz. When the temperature goes below
the overheating prevention line sixty seconds later,
normal operation is restored.
(2) Control for indoor freezing prevention
If the temperature of the indoor heat exchanger
stays below approximately 0
°
C for four minutes
during cooling or dry, this control stops the
compressor. Over 2˚C the compressor will run
again.
(3) Control for cold air blowing prevention
When heating begins, this control stops the indoor
fan until the temperature of the indoor heat
exchanger reaches 26
°
C. It also stops the fan if the
temperature goes below 23
°
C during operation.
(4) Indoor fan and operating frequency
The indoor fan has 12 speeds, and changing is
done in four stages, "Auto", "High", "Med", and
"Low". The relations between the indoor fan speed,
air quantity setting, operating frequency, and indoor
heat exchanger are shown in the following charts.
Operating
frequency
Over 50 Hz
Overheating prevention line (°C)
50 to 43 Hz 43 to 37 Hz Below 37 Hz
54
57
53
56
52
55
51
54
During normal
operation
During full
power operation
OFF
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
OFF
Fan speed
Frequency cord
Fan speed : High / Med / Low
High
Med
Low
OFF
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
OFF
Fan speed
Frequency cord
Fan speed : Automatic
COOLING
OFF
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
OFF
Fan speed
Frequency cord
Fan speed : High / Med / Low
12
A
B
C
A
B
C
Low
D - H
Med
D - H
High
D - H
OFF
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
OFF
Fan speed
Frequency cord
Fan speed : Automatic
12
A
B
C
A
B
C
G, H
D
E
F
HEATING
53
50
47
44
38
32
26
H
G
F
E
D
C
B
A
(˚C)
Cold air blowing
prevention line
Temperature of indoor heat exchanger
Differential
3˚C
