Read Sharp AE-M18 (serv.man2) Service Manual online
16
AY-M09AE
AE-M18AE
AE-M18AE
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 P1, the compressor is
automatically stopped. (during heat or cool or dry
operation)
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 "D" to "UL", or from "UL" to "L". And when the
current falls bellow P5, the indoor fan speed shift up is
canceled.
heating operation, controls the outdoor fan motor and
changes the indoor fan motor speed by detecting total
current.
When the current exceeds P1, the compressor is
automatically stopped. (during heat or cool or dry
operation)
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 "D" to "UL", or from "UL" to "L". And when the
current falls bellow P5, the indoor fan speed shift up is
canceled.
Figure Y-10
8. Freeze preventive
When the indoor pipe temperature falls below -1˚C
during cool operation or dry operation, the compressor
is turned off.
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.
40 minutes later after starting to operation, or 30
minutes later after defrost, when the outdoor pipe
temperature falls -5˚C, the defrosting is started, and
when the outdoor pipe temperature exceeds 11˚C, the
defrosting is ended.
In the defrost operation, first the compressor is turned
off, the san speed is set yo "UL" and the outdoor fan
motor is turned off.
30 seconds later the inddor fan motor is turned off, 50
seconds later the reverse valve is turned off, and 60
seconds later the compressor is turned on.
In the end of defrosting the compressor is turned off,
the outdoor fan motor is turned on, 50 seconds later the
reverse valve is turned on, 60 seconds lateer the
compressor is turned on, starting heat operation.
At this time, the indoor fan motor is turned off or the fan
spedd is set to "UL" if preheat air flow function is
effective.
compressor) counts time with microcomputer during
heat operation.
40 minutes later after starting to operation, or 30
minutes later after defrost, when the outdoor pipe
temperature falls -5˚C, the defrosting is started, and
when the outdoor pipe temperature exceeds 11˚C, the
defrosting is ended.
In the defrost operation, first the compressor is turned
off, the san speed is set yo "UL" and the outdoor fan
motor is turned off.
30 seconds later the inddor fan motor is turned off, 50
seconds later the reverse valve is turned off, and 60
seconds later the compressor is turned on.
In the end of defrosting the compressor is turned off,
the outdoor fan motor is turned on, 50 seconds later the
reverse valve is turned on, 60 seconds lateer the
compressor is turned on, starting heat operation.
At this time, the indoor fan motor is turned off or the fan
spedd is set to "UL" if preheat air flow function is
effective.
Outdoor
Fan motor
OFF
Fan motor
OFF
Indoor
Fan motor
Shift UP
Fan motor
Shift UP
Compressor
OFF
OFF
Time
Input current
Current transition
P1 6.3A
P2 5.7A
P3 5.0A
P4 4.3A
P5 4.0A
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.
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 “TEST RUN” button in the unit is pushed during
suspension of operation, cool test operation starts. At
this time, the fan speed is set to “AUTO”.
If this button is pushed during operation, the test
operation starts in current operation mode. The
operation LED (red) flickers during test run.
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.
suspension of operation, cool test operation starts. At
this time, the fan speed is set to “AUTO”.
If this button is pushed during operation, the test
operation starts in current operation mode. The
operation LED (red) flickers during test run.
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 24-HOUR PROGRAMMABLE ON/OFF TIMER
ON-TIMER or OFF-TIMER can be
independently programmed. 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, but, 16˚C set temperature at
the lowest).
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.
independently programmed. 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, but, 16˚C set temperature at
the lowest).
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.
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.
Defrost start
Compressor
Reverse
Valve
Valve
Outdoor
Fan Motor
Fan Motor
Indoor
Fan Motor
Fan Motor
Preheat Air
Flow Control
Flow Control
30sec.
MAX. 9min.
50sec. 10sec.
60sec.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
50sec. 10sec.
ON
OFF
ON
ON
OFF
ON
ON
OFF
ON
OFF
UL
Switch ON
Heating
Heating
Heating
Min.
40min.
40min.
Max.
11min.
11min.
Min.
30min.
30min.
Max.
11min.
11min.
Defrost
Defrost
Figure Y-11
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