Service Manual - MyLinkDrive
Service Manual - MyLinkDrive
Service Manual - MyLinkDrive
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7<br />
TROUBLESHOOTING<br />
7-1. HOW TO CHECK THE PARTS<br />
PKFY-P08, 12, 15, 18NHMU-E2<br />
Parts name Check points<br />
Room temperature<br />
thermistor (TH21)<br />
Liquid pipe temperature<br />
thermistor (TH22)<br />
Gas pipe temperature<br />
thermistor (TH23 ,24)<br />
Vane motor (MV)<br />
Red<br />
Yellow<br />
Brown<br />
Connect pin No.<br />
Fan motor (MF)<br />
M<br />
Orange<br />
Green<br />
<br />
Linear expansion<br />
valve (LEV) CN60<br />
White<br />
1<br />
Yellow<br />
2<br />
LEV<br />
Orange<br />
Blue<br />
Red<br />
3<br />
4<br />
5<br />
Brown<br />
6<br />
Disconnect the connector then measure the resistance with a tester.<br />
(At the ambient temperature 50°F~86°F)<br />
Normal<br />
4.3k~9.6k<br />
Abnormal<br />
Open or short<br />
Disconnect the connector then measure the resistance value with a tester.<br />
(Coil temperature 68°F)<br />
(1)-(5)<br />
White-Red<br />
Normal<br />
(2)-(6)<br />
Yellow-Brown<br />
200 ± 10%<br />
(3)-(5)<br />
Orange-Red<br />
15<br />
Refer to the next page for the details.<br />
Measure the resistance between the terminals with a tester. (Coil temperature 77°F)<br />
-<br />
Brown-Red<br />
Refer to 7-1-3.<br />
7-1-1. Thermistor<br />
<br />
Thermistor for<br />
lower temperature<br />
-<br />
Brown-Orange<br />
Normal<br />
350 ± 7%<br />
-<br />
Brown-Yellow<br />
Φ4<br />
Φ3<br />
Φ2<br />
Φ1<br />
Abnormal<br />
-<br />
Brown-Green Open or short<br />
Abnormal<br />
(4)-(6)<br />
Blue-Brown Open or short<br />
Room temperature thermistor (TH21)<br />
Liquid pipe temperature thermistor (TH22)<br />
Gas pipe temperature thermistor (TH23) (TH24)<br />
Thermistor R0=15kΩ ± 3%<br />
Fixed number of B=3480 ± 2%<br />
Rt=15exp { 3480( 1<br />
1 ) }<br />
30°F 15.8kΩ<br />
50°F 9.6kΩ<br />
70°F 6.0kΩ<br />
80°F 4.8kΩ<br />
90°F 3.9kΩ<br />
100°F 3.2kΩ<br />
7-1-2. Liner expansion valve<br />
Operation summary of the linear expansion valve<br />
• Linear expansion valve open/close through stepping motor after receiving the pulse signal from the indoor controller board.<br />
• Valve position can be changed in proportion to the number of pulse signals.<br />
Controller board<br />
<br />
OCH515<br />
273+(t-32)/1.8<br />
Linear expansion valve<br />
M 6<br />
Brown<br />
5 2<br />
Yellow<br />
1<br />
3<br />
White Red Orange<br />
4<br />
Blue<br />
273<br />
Brown<br />
Red<br />
Blue<br />
Orange<br />
Yellow<br />
White<br />
Resistance (kΩ)<br />
Connector(CN60)<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
-20 0 20 40 60 80 100 120<br />
Temperature (°F)<br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
< Thermistor for lower temperature ><br />
DC12V<br />
Drive circuit<br />
Φ4<br />
Φ3<br />
Φ2<br />
Φ1
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