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11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH MUZ-FD50VA
Part name
Defrost thermistor (RT61)
Ambient temperature
thermistor (RT65)
Fin temperature
thermistor (RT64)
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Compressor
Outdoor fan motor
R. V. coil (21S4)
Expansion valve coil
(LEV)
Defrost heater
MUZ-FD•VAH
High pressure switch
(HPS)
MUZ-FD50
Check method and criterion
Measure the resistance with a tester.
Refer to 11-6. "Test point diagram and voltage," 1. "Inverter P.C.
board", or 2. "Outdoor electronic control P.C. board", the chart of ther-
mistor.
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Refer to 11-6. "Test point diagram and voltage," 1. "Inverter P.C.
board", or 2. "Outdoor electronic control P.C. board", the chart of ther-
mistor.
Measure the resistance between terminals using a tester.
(Temperature: -10 ~ 40°C)
25/35
U-V
U-W
0.82 ~ 1.11 Ω
V-W
Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
RED – BLK
BLK – WHT
WHT – RED
Measure the resistance using a tester.
(Temperature: -10 ~ 40°C)
Normal
25/35
1.19 ~ 1.78 kΩ
Measure the resistance using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Measure the resistance using a tester.
(Temperature: -10 ~ 40°C)
Normal
349 ~ 428 Ω
Pressure
3.7 ± 0.15 MPa
+0.05
4.8
MPa
-0.1
Normal
50
0.60 ~ 0.82 Ω
Normal
25/35
50
11 ~ 16 Ω
12 ~ 17 Ω
50
1.15 ~ 1.71 kΩ
Normal
37 ~ 54 Ω
Close
Open
39
39
Figure
WHT
RED BLK
W
V
U
WHT
RED BLK
W
V
U
WHT
LEV
RED
ORN
YLW BRN
BLU
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