1
sec..
1
sec
0.6
sec.
1
sec.
1
sec.
1
sec.
1
sec.
1
sec.
0.6
sec.
1
sec.
1
sec.
1
sec.
1
sec.
1
sec.
1
sec.
1
sec.
1
sec.
1
sec.
0.6
sec.
0.6
sec.
1
sec.
0.6
sec.
1
sec.
0.6
sec.
100
80
60
40
20
0
-10 0 10 20 30 40
Resistance
Thermistor
Room temperature
Heat exchange
Color
Yellow
Orange
To measure the resistance, first remove
the soldering as shown at right.
Room temperature
thermistor TH1
Tester
1 time
Compressor lock
Overheat of the compressor
2 times
ON
OFF
ON
OFF
Signal
CN4
CN4
Figure 1 Temperature properties of indoor thermistors
500K
400K
300K
200K
100K
0
-20 0 20 60 80 100 120
3.06K5.78K
4.17K 2.28K
1.72K
1 6
40K
30K
20K
10K
0
-20 0 20 60
40
1 6
Figure 2 Temperature properties of outdoor thermistors
Connector
CN8
TH2 Heat exchange thermistor
TH3 Outdoor temp. thermistor
TH1 compressor thermistor
TH2,TH3
Connector
CN8
Temperature (°C)
Temperature (°C)
Tester
Tester
Thermistor To measure the
resistance, first
remove the
connector from the
board.
ColorNo. Connector
Compressor
thermistor
Heat exchanger
pipe thermistor
Outdoor temp.
thermistor
TH1
TH2
TH3
No. 1 to 2
No. 3 to 4
Red
Orange
No. 5 to 6
Green
Microcomputer
terminal
Input
signal
To Outdoor control board
Adaptor
(C14 )
(GND)
(R17)
Pin No. 43
Pin No. 42
0
1
0 Low input
1 High input
K
Heat exchange thermistor
TH2 (orange)
25°C resistance 15 K
Room temperature
thermistor TH1 (yellow)
25°C resistance 10 K
25°C resistance
45 K
Resistance ( )
Resistance ( )
0°C resistance
14.5 K
25°C resistance
4.428 K
Heat exchange
thermistor TH2
Tester
4 1
Cautions when attaching or removing the board
When operating only the outdoor unit (cooling 40 Hz fixed mode) To make
only the outdoor unit run in cooling mode, short the places marked with
arrows below with an adaptor, and apply a voltage of 220 ~ 240 V AC to 1
and N on the terminal board.
(Avoid operating the outdoor unit alone for long periods of time.)
PC1
PC2
R6
R5
R7
R16
R17
JP21
C14
Cool / 40Hz
3
4
1
2
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