Mitsubishi MXZ-2A20NA, Service Manual

Page: 67 / 102

700
600
500
400
300
200
100
0
Resistance (k
"
)
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
200
180
160
140
120
100
80
60
40
20
0
Resistance (k
"
)
Resistance (k
"
)
Temperature (˚F)
Temperature (˚F)
32 50 68 86 104 122 140 158 176
w
Except MXZ-2A20NA - .
1
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Gas pipe temperature thermistor (RT6A,6B,6C)
w
Outdoor heat exchanger temperature
thermistor (RT68) Fin temperature
thermistor (RT64)
67
LED 1
LED 2
CN801
294V DC
~
370V DC
Input
(
(
(
LEV Room A
(
12V DC pulse wave
(
LEV Room B
(
12V DC pulse wave
(
LEV Room C
(
12V DC pulse wave
(
High pressure switch
(
Gas pipe C thermistor
w
(
Gas pipe B thermistor
w
(
Gas pipe
A
thermistor
w
CN932 20-90V AC
GND
5V
5V DC pulse wave
(
T
o fan
motor
Defrost thermistor (R
T61)
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
LEV E
(
(+) (–
)
(
(+) (–
)
(
(+) (–
)
(
CN791 CN792 CN793
CN681 CN662
( ( (
F801
FUSE
T3.15AL250V
LED 3
(
Ambient temperature thermistor (R
T65)
CN663
Serial signal Room C
12~24V DC
Serial signal Room B
12~24V DC
Serial signal
Room A
12~24V DC
CN603
CN602
CN601
208/230V AC
Input
SW1
CN795 12V DC pulse wave
11-7. Test point diagram and voltage
1. Outdoor electronic control P.C. board
MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA
1
MXZ-3A30NA
OB444C--3.qxp 07.10.18 2:25 PM Page 67