22
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)
Normal
350
± 7%
Abnormal
-
Brown-Red
-
Brown-Orange
-
Brown-Yellow
-
Brown-Green
Open or short
Fan motor (MF)
Red
Yellow
Brown
Orange
Green
Connect pin No.
M
Refer to 9-6-2.
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 50
"
F~86
"
F)
(Refer to the next page for a detail.)
Room temperature
thermistor (TH1)
Liquid pipe thermistor
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Normal
4.3k
~9.6k
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
=15k
± 3%
Fixed number of B=3480 ± 2%
t( )Rt=15exp { 3480( ) }
0
10
20
25
30
40
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
PKA-A12HA4 PKA-A18HA4
