Sharp AE-XM30GR Service Manual page 16

k
100
80
Heat exchange thermistor
TH2 (Orange), TH3 (Black)
25ºC resistance 4.431 k
60
40
20
0
-10 0
CAUTION: when attaching or removing the board
When operating only the outdoor unit (cooling 55 Hz fixed mode) To make only the outdoor unit run in cooling mode, and apply a voltage
of 220 ~ 240V AC to 1 and N on the terminal board and push the pump down switch (SW1).
(Avoid operating the outdoor unit alone for long periods of time.)
TH2 : Heat exchanger pipe thermistor (CN8A 3 - 4 )
TH3 : Outdoor temp. thermistor (CN8A 5 - 6 )
TH4 : Suction thermistor (CN8A 7 - 8 )
TH6 : Thermistor unit A (CN8C 1 - 2 )
TH7 : Thermistor unit B (CN8C 3 - 4 )
TH8 : Thermistor unit C (CN8C 5 - 6 )
TH9 : Thermistor unit D (CN8C 7 - 8 )
TH1 compressor thermistor
(CN8A 1 - 2 )
500k
400k
300k
200k
100k
0
-20
Thermistor
Compressor thermistor
Heat exchanger pipe thermistor
Figure 1 Temperature properties of indoor thermistors
Room temperature
thermistor TH1 (Yellow)
25ºC resistance 10 k
10 20 30 40
Figure 2 Temperature properties of outdoor thermistors
25ºC resistance
45 k
5.78k 3.06k
4.17k
0 20 60 80 100 120
Temperature (ºC)
No. Connector
TH1 CN8A
TH2 CN8A
Thermistor Signal
Room temperature
TH1
Heat exchange
TH2
Pipe temperature
TH3
To measure the resistance, first remove
the soldering as shown at right.
1
Connector
CN8A
40k
30k
20k
10k
2.28k
1.72k
0
-20
Color Connector pin
Red No. 1 to 2
Orange No. 3 to 4
3 – 5
Room temperature
Color
thermistor TH1 (CN6 3 - 4 )
Yellow
Heat exchange
Orange
thermistor TH2 (CN6 1 - 2 )
Black
Pipe temperature
thermistor TH3 (CN6 5 - 6 )
CN6
1
Tester
1
8
8
Connector
CN8C
(MIH301C)
0ºC resistance
14.5 k
25ºC resistance
4.431 k
TH2 - TH4
TH6 - TH9
0 20 40 60
Temperature (ºC)
6