72
0
10
20
30
40
50
60
70
80
90
100 110 120
700
600
500
400
300
200
100
0
Resistance (k
'
)
Temperature (
;
)
Discharge temperature thermistor (RT62)
-20
-10
0
10
20
30
40
100
90
80
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
200
180
160
140
120
100
80
60
40
20
0
Resistance (k
'
)
Resistance (k
'
)
Temperature (
;
)
Temperature (
;
)
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Gas pipe temperature thermistor (RT6A,6B,6C,6D)
Outdoor heat exchanger temperature thermistor (RT68)
Fin temperature thermistor (RT64)
LED 1
LED 2
CN801
325V 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
(
LEV Room
D
(
12V DC
pulse wave
(
High pressure switch
(
Gas pipe D thermistor
(
Gas pipe C thermistor
(
Gas pipe B thermistor
(
Gas pipe
A
thermistor
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
CN794
CN681
MXZ-4A80V
A
CN662
(
(
(
F801
FUSE
3.15A/250V
LED 3
(
Ambient temperature
thermistor (R
T65)
CN663
Serial signal Room D
12~24V DC
Serial signal Room C
12~24V DC
Serial signal Room B
12~24V DC
Serial signal
Room A
12~24V DC
CN604
CN603
CN602
CN601
230V AC
50 Hz
Input
SW1
CN795
12V DC
pulse wave
2. Outdoor electronic control P.C. board
MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA
OB377--3.qxp 05.12.14 3:34 PM Page 72