MITSUBISHI ELECTRIC MUZ-FD09NA- U1 - Manual (Page 22)

22
10-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-FD09NA MUZ-FD12NA
Part name Check method and criterion Figure
Defrost thermistor
(RT61)
Ambient temperature
thermistor (RT65)
Outdoor heat ex-
changer temperature
thermistor (RT68)
Measure the resistance with a tester.
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, the chart of thermistor.
Discharge tem-
perature thermistor
(RT62)
Fin temperature
thermistor (RT64)
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, the chart of thermistor.
Compressor
Measure the resistance between terminals using a tester.
(Winding temperature : -4 ~ 104°F (-20 ~ 40°C))
Normal
U-V
U-W
V-W
1.52 ~ 2.17 Ω
Outdoor fan motor
Measure the resistance between lead wires using a tester.
(Part temperature : 14 ~ 104°F (-10 ~ 40°C))
Color of lead wire Normal
RED – BLK
BLK – WHT
WHT – RED
11 ~ 16 Ω
R. V. coil (21S4)
Measure the resistance using a tester.
(Part temperature : 14 ~ 104°F (-10 ~ 40°C))
Normal
970 ~ 1380 Ω
Expansion valve coil
(LEV)
Measure the resistance using a tester.
(Part temperature : 14 ~ 104°F (-10 ~ 40°C))
Color of lead wire Normal
WHT – RED
37 ~ 54 Ω
RED – ORN
YLW – BRN
BRN – BLU
2 3
W
U
V
1
WHT RED BLK
2 3
W
U
V
1
WHT RED BLK
LEV
WHT
RED
ORN
YL
W
BRN BLU