Service manual

38
-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)
1. Outdoor electronic control P.C. board
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
LED 1
LED 2
CN801
294 ~ 370
VDC
Input
CN932 20-90 VAC
GND 5 V
5 VDC pulse wave
To fan motor
Defrost thermistor (RT61) (MUZ) CN661
Discharge temperature thermistor (RT62) CN661 Outdoor heat exchanger temperature thermistor (RT68) CN661
(
(
(+)
(–)
(+)
Rush current relay
(–)
R.V. coil (–)
12 V
DC
15 V
15 V
CN931
(+) (–)
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 86 104 122 140 176 194 122 212 230 248
700
600
500
400
300
200
100
0
Resistance (kΩ)
Temperature (°F)
Discharge temperature thermistor (RT62)
F801
FUSE
3.15 A/250 V
Ambient temperature thermistor (RT65)
CN663
for indoor
5~10 VDC
CN601
208/230 VAC
60 Hz
Input
10-6. TEST POINT DIAGRAM AND VOLTAGE
CN681
High pressure switch