Mitsubishi Electronics PKH36FL, PKH24FL, PKH30FL How To Check The Parts, Refer to the thermistor

4. HOW TO CHECK THE PARTS

Parts name

Room temperature

thermistor (RT1) Pipe temperature

thermistor (RT2)

Fan motor (MF)

Relay connector

1 Red 1

3	White
	3

5 Black 5

Protector

Vane motor (MV)

4Orange

5 Red M

2Pink

Yellow Brown Blue

Connector 3 6 1

Check points

Disconnect the connector, then measure the resistance using a tester. (Surrounding temperature 50°F to 86°F)

Normal	Abnormal
4.3k' to 9.6k'	(Refer to the thermistor)
	Open or short

Measure the resistance between the terminals using a tester.

Motor terminal	Normal
or	PKH		Abnormal
Relay connector
	18,24FL	30,36FL
Red-White	99.5'i10%	62.6'i10%	Open or short
White-Black	103.5'i10%	74.0'i10%

Opening and closing temperature of protector.

Open: 266i41°F (Fan motor OFF)

Close: 176i68°F (Fan motor ON)

Measure the resistance between the terminals using a tester. (Surrounding temperature 68°F to 86°F)

	Normal	Abnormal
Brown-Yellow
Brown-Blue	186 to 214'	Open or short
Red-Orange
Red-Pink

<Thermistor Characteristic graph>

		Room temperature thermistor(RT1)
	Thermistor for
		Pipe temperature thermistor(RT2)
	lower temperature
Thermistor R0=15k' ± 3%
Fixed number of B=3480k' ± 2%

Rt=15exp { 3480(		1		1	) }
		273+t	273
32°F	15k'
50°F	9.6k'
68°F	6.3k'
77°F	5.4k'
86°F	4.3k'
104°F	3.0k'

Resistance (K")

< Thermistor for lower temperature >

50

40

30

20

10

0

-4 14 32 50 68 86 104 122

Temperature (°F)

44