25
9-6. HOW TO CHECK THE PARTS
Parts name
Check points
Vane motor (MV)
Measure the resistance between the terminals with a tester. (Coil temperature 77
_
F [25°C])
Normal
350
"
± 7%
Abnormal
1
-
2
Brown-Red
1
-
3
Brown-Orange
1
-
4
Brown-Yellow
1
-
5
Brown-Green
Open or short
Fan motor (MF)
2
Red
4
Yellow
1
Brown
Orange
3
Green
5
Connect pin No.
M
Refer to “9-6-2. DC Fan motor (fan motor/indoor controller circuit board)”.
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 50 to 86
_
F [10 to 30°C])
(Refer to “9-6-1. Thermistor”.)
Room temperature
thermistor (TH1)
Liquid pipe thermistor
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Normal
4.3 to 9.6 k
"
Abnormal
Open or short
9-6-1. Thermistor
<Thermistor Characteristic graph>
Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)
Condenser/evaporator temperature
thermistor (TH5)
Thermistor R
0
=15 k ± 3%
Fixed number of B=3480 ± 2%
t( )Rt=15exp { 3480( ) }
Thermistor for
lower temperature
1
273+t
1
273
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
-4 -14 32 50 68 86 104122 °F
Temperature
Resistance (k
)
<Thermistor for lower temperature>
1
273+
1
273
T-32
1.8
°C
"
32°F [0°C]
50°F [10°C]
68°F [20°C]
77°F [25°C]
86°F [30°C]
104°F [40°C]
15 k
"
9.6 k
"
6.3 k
"
5.4 k
"
4.3 k
"
3.0 k
"
PKA-A12HA6 PKA-A18HA6
OCH580
