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Sharp AH-A07BE Service Manual page 20

Split system room air conditioners
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AH-A07BE-C/09BE-C
AH-A07BE/09BE/12BE
AY-A07BE-C/09BE-C
AY-A07BE/09BE/12BE
7. Current control
This system, in order to prevent overcurrent during
heating operation, controls the outdoor fan motor and
changes the indoor fan motor speed by detecting total
current. When the current exceeds P2, the outdoor fan
motor is automatically turned off, and when the current
falls below P4, the outdoor fan motor is turned on.
When the current exceeds P3 and the indoor fan speed
shifts down because of cold air (5. Preheat air flow), the
changes in the indoor fan speed shifts up as follows,
from "off" to "HUL", or from "HUL" to "HL". And when
the current falls bellow P5, the indoor fan speed shift up
is canceled.
Current transition
Outdoor
Indoor
Fan motor
Fan motor
OFF
Shift UP
8. Freeze preventive
When the indoor pipe temperature falls below 0˚C
during cool operation or dry operation, the compressor
is turned off.
9. Defrost
The defrost timer (integrating the operation time of
compressor) counts time with microcomputer during
heat operation.
Frost of outdoor pipe is estimated by indoor pipe
temperature (TH2), room temperature (TH1), indoor
fan speed and operation state of compressor.
In the defrost operation, first the compressor is turned
off, the fan speed is set to "HUL" and the outdoor fan
motor is turned off.
30 seconds later the indoor fan motor is turned off, 60
seconds later the reverse valve is turned off, and the
compressor is turned on. In the end of defrosting, the
compressor is turned off, the outdoor fan motor is
turned on, 60 seconds later the reverse valve is turned
on, and the compressor is turned on, starting heat
operation. At this time, the indoor fan motor is turned
off or the fan speed is set to "HUL" if preheat air flow
function is effective.
Switch ON
Heating
Min.
40min.
(AY--A07BE/A07BE-C)
(AY--A09BE/A09BE-C/A12BE)
AY-A07BE
AY-A09BE
AY-A07BE-C
AY-A09BE-C AY-A12BE
P1 5.1A
6.6A
10.0A
P2 4.3A
5.3A
8.0A
P3 3.9A
4.7A
7.2A
P4 3.3A
3.8A
6.1A
P5 3.0A
3.4A
3.5A
Time
Compressor
OFF
Figure Y-10
Defrost
Defrost
Heating
Heating
Min.
Max.
Max.
30min.
8min.
8min. (AY--A07BE/A07BE-C)
9min. (AY--A09BE/A09BE-C/A12BE)
9min.
Figure Y-11
Defrost start
60sec.
ON
Compressor
OFF
ON
Reverse
Valve
OFF
ON
Outdoor
Fan Motor
OFF
ON
HUL
Indoor
Fan Motor
OFF
Figure Y-12
10. Delayed operation of the reverse valve
When the heat operation is shut down or the operating
mode is switched from heat to cool or dry, or vice versa,
the reverse valve is switched after 3 minutes.
11. Test run
If the "AUX" button on the unit is pressed for 5 seconds
or more during operation, cool test operation starts.
The operation LED (red) flickers during test run.
To put the system in the heating test run mode, start the
cooling operation and select the heating mode on the
remote control. In cool and heat mode continuous
compressor on operation is performed. In dry mode the
operation is in dehumidifying zone. In fan only mode
the indoor fan motor runs continusly.
12.Timer
12-1 ON/OFF TIMER
When the unit operates during one hour after
the OFF-time is set, thermostat setting is
automatically shifted (+1˚C in cool operation
and dry operation, -3˚C in heat operation, 16˚C
- 32˚C). When the ON-timer is set in heat
operation and cool operation, operation starts
before 0 to 30 minutes(depends on the room
temperature) so that preset temperature is
obtaind at set time.
12-2 ONE-HOUR TIMER
When ONE-HOUR timer is set, the unit turns
off automatically after one hour. The one hour
timer operation has priority over other time
operation, such as the TIMER ON and TIMER
OFF. If the ONE-HOUR TIMER button is
pressed again during operation, the unit will
operate additionally for another one hour.
20
60sec.
MAX. 8min.
(AY-A07BE/A07BE)
MAX. 9min.
(AY-A09BE/A09BE-C/A12BE)
60sec.
30sec.
Preheat Air
Flow Control

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