Mitsubishi MUY-A15NA, Service Manual

Page: 56 / 79

56
3. Outdoor electronic control P.C. board
MUZ-A24NA MUY-A24NA
LED 1
LED 2
CN801
294V DC
~
370V DC
Input
(
(
CN932 20-90V AC
GND
5V
5V DC pulse wave
(
To
f
a
n
motor
Defrost thermistor (R
T61)
(MUZ)
Discharge temperature thermistor (R
T62)
Outdoor heat exchanger temperature thermistor (R
T68)
(
(
(+) (–)
(+)
Rush current relay
(–)
R.V
. coil (–)
(
12V
DC
15V 15V
(+) (–)
CN931
(
CN661
CN701 Signal transmission (T
o power board)
5V DC pulse wave
(+) (–)
(
GND
CN702 Signal reception (From power board) 5V DC pulse wave
GND (power board) CN781
CN795 12V DC pulse wave
LEV
(
( ( (
-4 14 32 10 20 30 40
100
90
80
70
60
50
40
30
20
10
0
32 50 68 84 104 122 140 158 176
200
180
160
140
120
100
80
60
40
20
0
Resistance (k
’
)
Resistance (k
’
)
Temperature (
°
F)
Temperature (
°
F)
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)
Fin temperature thermistor (RT64)
32 50 68 84 104 122 140 176 194 122 212 230 248
700
600
500
400
300
200
100
0
Resistance (k
'
)
Temperature (
°
F)
Discharge temperature thermistor (RT62)
F801
FUSE
3.15A/250V
(
Ambient temperature thermistor (R
T65)
CN663
for indoor
5~10V DC
CN601
208/230V AC
60 Hz
Input
(
(
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