25
OCH758
9-6. HOW TO CHECK THE PARTS
0
10
20
30
40
50
-20 -10
0
10 20 30 40 50
< Thermistor for lower temperature >
Temperature (
:
)
Resistance (k
"
)
<Thermistor Characteristic Graph>
Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)
Condenser/evaporator temperature ther-
mistor (TH5)
R
t
: Thermistor resistance
t: Temperature
Thermistor R
0
=15k
"
± 3%
Fixed number of B=3480
± 1%
R
t
= R
0
exp B -
{ ( )}
273 + t
273
1
1
t
Rt
0
:
15 k
"
10
:
9.6 k
"
20
:
6.3 k
"
25
:
5.4 k
"
30
:
4.3 k
"
40
:
3.0 k
"
Thermistors for
lower temperature
9-6-1. Thermistor
Parts name
Checkpoints
Room temperature
thermistor (TH1)
Pipe temperature
thermistor/liquid(TH2)
Condenser/evaporator
temperature thermistor (TH5)
Disconnect the connector then measure the resistance with a multimeter.
Refer to “9-6-1. Thermistor”.
Vane motor (MV)
Sky Blue
Sky Blue
Red
Sky
Blue
7
9
10
6
8
Connector(CNV)
pin No.
M
Sky
Blue
Measure the resistance between the terminals with a
multimeter
. (At the ambient temperature 25°C)
Normal
0
-
9
Red-Sky Blue
0
-
8
Red-Sky Blue
0
-
7
Red-Sky Blue
0
-
6
Red-Sky Blue
300
"
± 7%
Vane motor (Lower MV2)
Sky Blue
Sky Blue
Red
Sky
Blue
2
4
5
3
1
M
Connector(CNV)
pin No.
Sky
Blue
Measure the resistance between the terminals with a multimeter. (At the ambient temperature 25°C)
Normal
5
-
4
Red-Sky Blue
5
-
3
Red-Sky Blue
5
-
2
Red-Sky Blue
5
-
1
Red-Sky Blue
300 ± 26.3
"
Fan motor (MF)
Refer to “9-6-2. DC Fan motor (fan motor/indoor controller circuit board)”.
