Mitsubishi Electric MXZ-2C20NA2 Service Manual page 130

1. Outdoor control P.C. board
MXZ-3C24NA MXZ-3C30NA
MXZ-4C36NA
CN741
Signal translation
(To Communication
adaptor board)
V (Rotate signal)
FG
(Voltage between
right pins of PC931,
pin 3 and pin 4)
(Same as
(CNF1 (+)- (−))
V (Rotate instruction)
SP
(Voltage between pins
of C930): 0 V DC
(when stopped),
1.8 - 6.5 V DC
(when operated)
(Correspond to
(CNF1 (+)- (−))
CNF1
To fan motor
Bus-bar voltage
290 ~ 370 V DC
15 V DC
CNDC
Bus-bar
voltage
290 ~ 370
V DC
CN63H
High
pressure
switch
OBH702N
Discharge temperature thermistor (RT62)
700
600
500
400
300
200
100
0
0 10 20
32 50 68
Thermistor R100 = 13.36 kΩ ± 2% , B constant = 4014 ± 2%
Rt = 13.36exp{4014(
Serial signal 12 ~ 24 V
208/230 V AC Room A
Room B Room C Room D
Input
CN601
130
30 40 50 60 70 80 90 100 110 120
86 104 122 140 158 176 194 212 230 248
Temperature
1 1
)} , t: ºC = (ºF - 32)/1.8
273+t 373
CN621
CN611
LED3
LED2
LED1
LEV: 12 V DC
pulse wave
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
100
90
80
70
60
50
(ºC)
(ºF)
40
30
20
10
0
-20 -10 0 10 20
-4 14 32 50 68
Temperature
Thermistor R25 = 10 kΩ ± 2%
B constant = 3950 ± 2%
1
Rt = 10exp{3950(
273+t
t : ºC = (ºF - 32)/1.8
F711 FUSE
T3.15AL250V
CNAC
to outdoor power P.C.
board 208/230 V AC
Input
CN714 Base heater
208/230 V AC
Output
CN713 Valve coil
208/230 V AC
Output
CN712 R.V. coil
208/230 V AC
Output
CNTH2
Ambient temperature
thermistor
(RT65)
CNTH1
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Defrost thermistor
(RT61)
SW1
SW871
SW2
30 40 (ºC)
86 104 (ºF)
1
)}
298