Sharp AU-M188 Service Manual ▷ View online
9
AH-M098E
AU-M188E
AU-M188E
MICROCOMPUTER CONTROL SYSTEM
1. Temperature control characteristic
1-1
Operation COOL
In the mode “COOL”, the thermostat circuit is
controlled by four thermostat lines (C1 ~ C4).
In the mode “COOL”, the thermostat circuit is
controlled by four thermostat lines (C1 ~ C4).
2. Operation modes
2-1
Operation COOL
The compressor turns on or off, at the
thermostat lines C3 and C4. The outdoor fan
motor is also controlled with the compressor.
The compressor turns on or off, at the
thermostat lines C3 and C4. The outdoor fan
motor is also controlled with the compressor.
Figure H-2
Room temperature( C)
Preset temperature(˚C)
18
32
D1
D2
D3
17.5
18.5
19.5
31.5
32.5
33.5
2-2
Operation DRY
On the switch on, the compressor always starts
to operate for 2 minutes with fan speed “D”
(slower than “UL”).
The microcomputer reads the room temperature
2 minutes after this first compressor operation.
This room temperature is set as the preset
temperature automatically.
The preset temperature ranges from 18˚C to
32˚C.
When the room temperature is below 18˚C, the
preset temperature is set to 18˚C, and when
the room temperature is over 32˚C, the preset
temperature is set to 32˚C.
Dry operation is divided into three zones
(Cooling zone, Dehumidifying zone and
Circulating zone) by thermostat lines (D1 to
D3), and the compressor and the fan motor
are controlled in each zone as shown in Table
H-1.
On the switch on, the compressor always starts
to operate for 2 minutes with fan speed “D”
(slower than “UL”).
The microcomputer reads the room temperature
2 minutes after this first compressor operation.
This room temperature is set as the preset
temperature automatically.
The preset temperature ranges from 18˚C to
32˚C.
When the room temperature is below 18˚C, the
preset temperature is set to 18˚C, and when
the room temperature is over 32˚C, the preset
temperature is set to 32˚C.
Dry operation is divided into three zones
(Cooling zone, Dehumidifying zone and
Circulating zone) by thermostat lines (D1 to
D3), and the compressor and the fan motor
are controlled in each zone as shown in Table
H-1.
Figure H-3
Room temperature(C˚)
Preset temperature(C˚)
Room
temperature
transition
temperature
transition
C3
C4
States 1 & 3 : Compressor ON
State 2 : Compressor OFF
State 2 : Compressor OFF
1
2
3
Room temperature( C)
Preset temperature(˚C)
18
32
C1
C2
C3
C4
17.5
18.5
19.5
20.5
31.5
32.5
33.5
34.5
Figure H-1
1-2
Operation DRY
In the mode “DRY”, the thermostat circuit is
controlled by three thermostat lines (D1 ~ D3).
In the mode “DRY”, the thermostat circuit is
controlled by three thermostat lines (D1 ~ D3).
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AH-M098E
AU-M188E
AU-M188E
3. FAN speed
Fan speeds are given by the indoor fan motor, “M”
(fastest), “L”, and “UL”, which are available in the
following operation mode.
(fastest), “L”, and “UL”, which are available in the
following operation mode.
Table H-2
FAN Switch
COOL
FAN ONLY
HIGH
M
M
LOW
L
L
SOFT
UL
UL
Room temperature(C˚)
Preset temperature(C˚)
Room
temperature
transition
temperature
transition
D3
D2
D1
States 1 & 5 : Cooling zone
States 2 & 4 : Dehumidifying zone
State 3 : Circulating zone
States 2 & 4 : Dehumidifying zone
State 3 : Circulating zone
4
5
3
1
2
Figure H-4
Table H-1
Compressor Fan
Speed
Cooling zone
ON
“UL”
Dehumidifying
ON
“D”
zone
Circulating zone
OFF
“D” or OFF
2-3
Operation FAN ONLY
The indoor fan motor always turns on.
The indoor fan motor always turns on.
4. Freeze preventive
When the indoor pipe temperature falls below -1˚C
during cool operation or dry operation, the compressor
is stopped.
during cool operation or dry operation, the compressor
is stopped.
5. 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 the mode cool continuous (compressor ON)
operation is performed. In the mode dry operation os
in the operation dehumidifying zone. In the fan only
mode the indoor fan only mode the indoor fan motor
runs continuously.
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 the mode cool continuous (compressor ON)
operation is performed. In the mode dry operation os
in the operation dehumidifying zone. In the fan only
mode the indoor fan only mode the indoor fan motor
runs continuously.
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AH-M098E
AU-M188E
AU-M188E
Room temperature
(C˚)
Preset temperature (C˚)
R o o m
t e m p e r a t u r e
t e m p e r a t u r e
t r a n s i t i o n
C3
C2
C1
States 1 & 5 :"M"
States 2 & 4 : "L"
States 2 & 4 : "L"
State 3 : "UL"
1
2
3
4
5
6. Timer
6-1 24-HOURS PROGRAMMABLE ON/OFF TIMER
ON-TIMER or OFF-TIMER can be independently
programmed.
The unit operaater at the preset temperature
during one hour after the OFF-time is set, and
then preset tempeerture is automatically shifted
up (+1˚C in cool operation and dry operation).
When the ON-timer is set in cool operation,
operation starts befor 0 to 30 minutes (depends
on the room temperature), so that prset
temperature is obtaind at set time.
programmed.
The unit operaater at the preset temperature
during one hour after the OFF-time is set, and
then preset tempeerture is automatically shifted
up (+1˚C in cool operation and dry operation).
When the ON-timer is set in cool operation,
operation starts befor 0 to 30 minutes (depends
on the room temperature), so that prset
temperature is obtaind at set time.
6-2 ONE-HOUR TIMER
When ONE-HOUR TIMER is set, the unit turns
off automatically after one hour. The ONE-
HOOUR TIMER operation has priority over other
time operation, such as the TIMER ON and
TIMER OFF. If the button One-HOUR TIMER is
pressed again during operation, the unit will
operate additionally for another one hour.
off automatically after one hour. The ONE-
HOOUR TIMER operation has priority over other
time operation, such as the TIMER ON and
TIMER OFF. If the button One-HOUR TIMER is
pressed again during operation, the unit will
operate additionally for another one hour.
7.Automatic air conditioning
When automatic air conditioning is selected, the
operation mode and preset temperature are set
automatically according to the room temperature on
starting operation.
operation mode and preset temperature are set
automatically according to the room temperature on
starting operation.
Table H-3
Room temperature
Operation
Preset
of operation start
Mode
temperature.
Above 28˚C
26˚C
26 to 28˚C
COOL
25˚C
24 to 26˚C
24˚C
Below 24˚C
DRY
Room
temperature at
operation start
8. Automatic fan speed control
If the automatic fan speed is selected in cool operation,
the fan speed is automaatically shanged according to
the thermostat line C1 C2, snd C3.
the fan speed is automaatically shanged according to
the thermostat line C1 C2, snd C3.
Figure H-5
9. Outputs at each operation mode
Table H-4
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
OFF
ON
ON
L/UL
UL/D
D/OFF
OFF
OFF
ON
Cooling
Dehumidifying
Circulating
DRY
Compressor
Outdoor
Fan motor
Indoor
Fan motor
FAN ONLY
COOL
Cooling
Circulating
10.Power on start
If the connecting wire "Power ON"(JP8) is cut on the
PWB ass’y, when the power is supplied by turning on
a circuit breaker, the air conditioner automatically starts
of operation in “AUTO” .
PWB ass’y, when the power is supplied by turning on
a circuit breaker, the air conditioner automatically starts
of operation in “AUTO” .
11.AUTO restart
If the connecting wire "MEMORY" (JP9)is cut, and on
IC6 is soldered on the PWB ass'y, and power failure
occurs during operation, the unit will restart in the
same operation mode, after power recovery.
IC6 is soldered on the PWB ass'y, and power failure
occurs during operation, the unit will restart in the
same operation mode, after power recovery.
12
AH-M098E
AU-M188E
AU-M188E
12.Trouble suspension
When indoor fan motor is out of order or compressor-lock occurs, the compressor, indoor fan motor, outdoor fan
motor, and louver are all stopped and the operation LED(red) turns off and the timer LED(yellow) turns on or off
as follows.
motor, and louver are all stopped and the operation LED(red) turns off and the timer LED(yellow) turns on or off
as follows.
13.Test mode
13-1 TEST 1(For control circuit operation checking)
Make terminals 1 and 2 of connector CN4 short-
circuited and supply the power.
Hereby the timer's period becomes shortened.
In this test mode, the control times are shortened
as follows.
circuited and supply the power.
Hereby the timer's period becomes shortened.
In this test mode, the control times are shortened
as follows.
The operation LED flicker's period:
in Test run : not shortened
The protector timer:
The protector timer:
Other controls:
in Test run : not shortened
The protector timer:
The protector timer:
Other controls:
1/60(ex.: 3 min. to 3 sec.)
ON
OFF
OFF
1sec.
1sec.
4sec.
Timer LED
(yellow)
(yellow)
13-2 TEST 2 (For output of each operation checking)
Keep pushing both the buttons, "AUX." and :
"TEST RUN" and supply the power, the system
will go to the test 2 mode.
In this mode, the output of operation is switched
by pushing the button "TEST RUN" on the unit
or the button "0/I" on the remote controller.
Use the button "AUX." to back to step 1.
Normal outputs are shown in Table H-5, H-6.
"TEST RUN" and supply the power, the system
will go to the test 2 mode.
In this mode, the output of operation is switched
by pushing the button "TEST RUN" on the unit
or the button "0/I" on the remote controller.
Use the button "AUX." to back to step 1.
Normal outputs are shown in Table H-5, H-6.
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