Service manual

62
-4 14 32 50 68 86 104
100
90
80
70
60
50
40
30
20
10
0
32 50 68 86 104 122 140 158 176
200
180
160
140
120
100
80
60
40
20
0
Resistance (kΩ)
Resistance (kΩ)
Temperature (°F)
Temperature (°F)
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)
Fin temperature thermistor (RT64)
3. Outdoor electronic control P.C. board
MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA
LED 1
LED 2
Bus-bar
voltage
CN801
294 - 370
VDC
Input
(
(
CN932 20-90 VAC
GND
5V
5 VDC pulse wave
(
To fan motor
Defrost thermistor (RT61)(MUZ)
Discharge temperature thermistor(RT62)
Outdoor heat exchanger temperature thermistor (RT68)
(
(
(+) (–)
(+)
Rush current relay
(–)
R.V. coil (–)
(
12V
DC
15V
15V
CN931
(+)
(–)
(
CN661
CN701 Signal transmission (To power board) 5 VDC pulse wave
(+)
(–)
(
GND
CN702 Signal reception (From power board) 5 VDC pulse wave
GND (power board)
CN781
CN795 12 VDC pulse wave
LEV
(
( ( (
32 50 68 86 104 122 140 158 176 194 212 230 248
700
600
500
400
300
200
100
0
Resistance (kΩ)
Temperature (°F)
Discharge temperature thermistor (RT62)
F801
FUSE
3.15A/250V
(
Ambient temperature thermistor (RT65)
CN663
for indoor
5-10 VDC
CN601
208/230 VAC
60 Hz
Input
(
(
(