15
15
TROUBLESHOOTING
7
7-1. HOW TO CHECK THE PARTS
PKFY-P08, 12, 15, 18NHMU-E2
Parts name
Check points
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 50°F~86°F)
Disconnect the connector then measure the resistance value with a tester.
(Coil temperature 68°F)
Vane motor (MV)
Linear expansion
valve (LEV)
Refer to the next page for the details.
Room temperature
thermistor (TH21)
Liquid pipe temperature
thermistor (TH22)
Gas pipe temperature
thermistor (TH23 ,24)
Normal
4.3k
~9.6k
Abnormal
Open or short
Normal
200
± 10%
Abnormal
(1)-(5)
White-Red
(2)-(6)
Yellow-Brown
(3)-(5)
Orange-Red
(4)-(6)
Blue-Brown
Open or short
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
1
2
3
4
5
6
LEV
White
Yellow
Orange
Blue
Red
Brown
CN60
Refer to 7-1-3.
7-1-2. Liner expansion valve
7-1-1. Thermistor
4
ĭ
4
3
6
5
ĭ
3
2
ĭ
2
1
ĭ
1
ĭ
4
ĭ
3
ĭ
2
ĭ
1
Controller board
Drive circuit
Connector(CN60)
DC12V
Brown
Red
Blue
Orange
Yellow
White
M
4
6
2
3
5
1
Blue
Brown
Yellow
Orange
Red
White
Linear expansion valve
<Thermistor characteristic graph>
Room temperature thermistor (TH21)
Liquid pipe temperature thermistor (TH22)
Gas pipe temperature thermistor (TH23) (TH24)
Thermistor R
0
=15k
± 3%
Fixed number of B=3480 ± 2%
Rt=15exp { 3480( ) }
30°F
15.8k
50°F
9.6k
70°F
6.0k
80°F
4.8k
90°F
3.9k
100°F 3.2k
Thermistor for
lower temperature
Operation summary of the linear expansion valve
• Linear expansion valve open/close through stepping motor after receiving the pulse signal from the indoor controller board.
• Valve position can be changed in proportion to the number of pulse signals.
<Connection between the indoor controller board and the linear expansion valve>
1
273+(t-32)/1.8
1
273
0
10
20
30
40
50
0
-20
20
40
60
80
100
120
< Thermistor for lower temperature >
Temperature (°F)
Resistance (k
)
OCH515
