Mitsubishi Electric MXZ-3C30NA Service Manual page 83

11-7. TEST POINT DIAGRAM AND VOLTAGE
1. Outdoor control P.C. board
MXZ-3C24NA
MXZ-4C36NA
V (Rotate signal)
FG
(Voltage between
right pins of PC931,
pin 3 and pin 4)
(Same as
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
To fan motor
Bus-bar voltage
290 ~ 370 V DC
15 V DC
CNDC
Bus-bar
voltage
290 ~ 370
VDC
CN63H
High
pressure
switch
OBH702E
MXZ-3C30NA
CN741
230 V AC Room A
Signal translation
Input
(To Communication
adaptor board)
CN601
Discharge temperature thermistor (RT62)
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80
32 50 68 86 104 122 140 158 176 194 212 230 248
Temperature
Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2%
1 1
Rt = 13.36exp{4014( )} , t: ºC = (ºF - 32)/1.8
273+t 373
Serial signal 12 ~ 24 V
Room B Room C Room D
CN611
LEV: 12 V DC
pulse wave
83
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
100
90
80
70
60
50
90 100 110 120 (ºC)
(ºF)
40
30
20
10
0
-20
-4
Thermistor R25 = 10 k ± 2%
CN621
B constant = 3950 ± 2%
Rt = 10exp{3950(
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
LED3
LED2
LED1
-10 0 10 20 30 40 (ºC)
14 32 50 68 86 104 (ºF)
Temperature
1 1
)}
273+t 298