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52
700
600
500
400
300
200
100
0
Resistance (kΩ)
Temperature (°F)
Discharge temperature thermistor (RT62)
32
50 68 86 104 122 140 158 176 194 212 230 248
-4 14 32 50 68 86 104
100
90
80
70
60
50
40
30
20
10
0
Resistance (kΩ)
Temperature (°F)
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
11-7. TEST POINT DIAGRAM AND VOLTAGE
1. Outdoor electronic control P.C. board
MXZ-2B20NA
LED 1
LED 2
Bus-bar
voltage
CN801
294 V DC
~
370 V DC
Input
(
(
(
LEV Room
A
(
12 V DC
pulse wave
(
LEV Room
B
(
12 V DC
pulse wave
CN932
20-90 V AC
GND
5 V
5 V DC
pulse wave
(
To fan
motor
Defrost thermistor (RT61)
Discharge temperature thermistor (RT62)
Outdoor heat exchanger
temperature thermistor (RT68)
(
(
(+)
(–)
(+)
Rush current relay
(–)
(–)R.V. coil
(
12 V
DC
15 V
15 V
CN931
(+)
(–)
(
CN661
CN701
Signal transmission
(To power board)
5 V DC pulse wave
(+)
(–)
(
GND
CN702
Signal reception
(From power board)
5 V DC pulse wave
GND (power board)
CN781
LEV E
(
(+)
(–)
(
(+)
(–)
(
CN791
CN792
(
(
(
F801
FUSE
T3.15AL250V
LED 3
(
Ambient temperature
thermistor (RT65)
CN663
Serial signal Room B
12~24 V DC
Serial signal
Room A
12~24 V DC
CN602
CN601
208/230 V AC
Input
SW1
CN795
12 V DC
pulse wave
DM06Y765