32
5. How to check the parts
Room temperature
thermistor (RT1)
Pipe temperature
thermistor (RT2)
Transformer
Fan motor
Disconnect the connector, then measure the resistance using a tester.
(Surrounding temperature 10°C~30°C)
Disconnect the connector and measure the resistance using a tester.
Measure the resistance between the terminals using a tester.
Normal
4.3k
'
~9.6k
'
Abnormal
Open or short
CNT(1)-(3)
Normal
WHT. Approx. 135
'
CN4T(1)-(2)
BRN. Approx. 0.5~2.0
'
Abnormal
Open or short
Motor terminal
or
Relay connector
Normal
PK-
2.5, 3FLD
/1/2
Abnormal
Red-White
99.5
'
i
10%
Open or short
White-Black
103.5
'
i
10%
1
2
3
1
2
3
4
CNT
T
CN4T
BRN
RED
WHT
YLW
1
1
3
3
5
5
Red
White
Black
Relay connector
Protector
OFF : 130
i
5˚C
ON : 80
i
20˚C
Parts name
Check points
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(RT1)
Pipe temperature thermistor(RT2)
Thermistor R
0
=15k
'
± 3%
Fixed number of B=3480k
'
± 2%
Rt=15exp { 3480( ) }
0
:
15k
'
10
:
9.6k
'
20
:
6.3k
'
25
:
5.4k
'
30
:
4.3k
'
40
:
3.0k
'
Thermistor for
lower temperature
1
273+t
1
273
CN4T(3)-(4)
RED. Approx. 1.0~2.0
'
4FLSD
/1/2
62.6
'
i
10%
74.0
'
i
10%
Vane motor
Measure the resistance between the terminals using a tester.
(Surrounding temperature 20°C~30°C)
Normal
186~214
'
Abnormal
Open or short
3 6 1
4
5
2
M
Pink
Connector
Red
Orange
Blue
Brown
Y
ellow
Brown-Yellow
Brown-Blue
Red-Orange
Red-Pink
OC232--2.qxp 01.10.1 8:58 PM Page 32