Mitsubishi Electric Mr.Slim PKH-2FKA Technical & Service Manual page 62

9. How to check the parts
Parts name
Disconnect the connector then measure the resistance using a tester.
Room temperature
(Surrounding temperature 10:~30:)
thermistor (RT1)
Pipe temperature
thermistor (RT2)
Fan motor (MF) Measure the resistance between the terminals using a tester.
(Winding temperature 20:)
Relay connector
1
Red 1
White
2
2
3
Black
3
Protector
Measure the resistance between the terminals using a tester.
Vane motor (MV)
(Surrounding temperature 20:~30:)
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k' ± 3%
0
Fixed number of B=3480k' ± 2%
Rt=15exp { 3480(
273+t
0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.4k'
30: 4.3k'
40: 3.0k'
Normal
4.3k"~9.6k" Open or short
Motor terminal
or
PKH-2FKA
Relay connector
Red–Black
154.3"
White–Black
162.0"
OFF : 120i5:
Protector
ON : OFF–15:
Connector
Brown–Yellow
Brown–Blue
186~214"
Red–Orange
Red–Pink
Room temperature thermistor(RT1)
Pipe temperature thermistor(RT2)
1 1
) }
273
Check points
Abnormal
Normal
PKH-2.5, 3FKA PKH-4FKSA
3 2/3
99.5"
103.9"
OFF:130i5:
ON :80i20:
Abnormal
Normal
Open or short
50
40
30
20
10
0
62
Abnormal
2/3
62.6"
Open or short
74.0"
< Thermistor for lower temperature >
-20 -10 0 10 20 30
Temperature (:)
40 50