– 70 –
No.
1
Part name
Room temp. (TA) sensor
Heat exchanger (TC, TCJ)
sensor
Checking procedure
Disconnect the connector and measure the resistance value with tester.
(Normal temp.)
Red
White Blac
5
4
3
2
1
White
Yellow
Yellow
Yellow
Yellow
5
4
3
2
1
Refer to 11-4-1.
Measure the resistance value of each winding coil by using the tester.
(Under normal temp. 25°C)
Measure the resistance value of each winding by using the tester.
2
3
Remote controller
Louver motor
MP24Z
4 Indoor fan motor
(Model : SWF-230-60-1R)
Temperature
Sensor
TA, TC, TCJ (kΩ)
10°C 20°C 25°C 30°C 40°C
20.7 12.6 10.0 7.9 4.5
Position
1 to 2
1 to 3
1 to 4
1 to 5
Resistance value
380 ± 40Ω
Position
Red - White
White - Black
Black - Red
Resistance value
70 to 100Ω
11-6. How to Check Simply the Main Parts
11-6-1. How to Check the P.C. Board (Indoor Unit)
(1) Operating precautions
1) When removing the electric parts box or the P.C. board, be sure to shut off the power supply breaker.
2) When removing the P.C. board, hold the edge of the P.C. board and do not apply force to the parts.
3) When connecting or disconnecting the connectors on the P.C. board, hold the whole housing.
Do not pull at the lead wire.
(2) Inspection procedures
1) When the P.C. board is judged to be defective, check for disconnection, burning, or discoloration of the
copper foil pattern or this P.C. board.
2) The P.C. board consists of the following 2 parts
a. Main P.C. board part :
DC power supply circuit (5V, 12V), Indoor fan motor control circuit, CPU and peripheral circuits,
buzzer, and Driving circuit of top/ bottom louver.
b. Indication unit of infrared ray receiving infrared ray receiving circuit, LED :
11-6-2. Sensor characteristic table
11-6-3. Indoor Unit (Other Parts)
30
40
50
20
10
0
0102030 4050
Resistance value (k
W
)
Temperature (˚C)
TA : Room temp. sensor
TC : Heat exchanger temp. sensor
TCJ : Heat exchanger temp. sensor
TA, TC, TCJ
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