Sharp AH-X127E Service Manual page 20

AH-X127E
AU-X127E
AY-X127E
AE-X127E
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.
(˚C)
H
53
G
50
F
47
E
44
D
38
C
32
B
26
A
(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.
Operating Overheating prevention line (°C)
frequency
Over 50 Hz
During normal
54
operation
During full
57
power operation
(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.
Differential
3˚C
Cold air blowing
prevention line
50 to 43 Hz 43 to 37 Hz Below 37 Hz
53 52 51
56 55 54
COOLING
Fan speed : High / Med / Low
11
10
9
8
7
6
5
4
3
2
1
OFF
OFF 1
Fan speed : Automatic
11
10
9
8
7
6
5
4
3
2
1
OFF
OFF 1
HEATING
Fan speed : High / Med / Low
12
11
10
9
8
7
6
5
4
3
2
1
OFF
OFF 1 2
Frequency cord
Fan speed : Automatic
12
11
10
9
8
7
6
5
4
3
2
1
OFF
OFF 1 2
Frequency cord
20
High
Med
Low
2 3 4 5 6 7 8 9
Frequency cord
2 3 4 5 6 7 8 9
Frequency cord
High
D - H
Med
D - H
Low
D - H
C
B
A
3 4 5 6 7 8 9 A B C
G, H
F
E
D
C
B
A
3 4 5 6 7 8 9 A B C