Test Point Diagram And Voltage; Outdoor Control Pc Board - Mitsubishi Electric MXZ-2C20NA2-U1 Service Manual

11-7. TEST POINT DIAGRAM AND VOLTAGE

MXZ-2C20NA2
CN741
Signal translation
(To Communication
adaptor board)
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
V DC
CN63H
High
pressure
switch
OBH702G
Dischar e temperature thermistor (RT62)
700
600
500
400
300
200
100
0
0 10 20 30
32 50 68 86
Thermistor R100
Rt 13.36exp 4014(
Serial signal 12 ~ 24 V
208/230 V AC Room A
Room B
Input
CN601
94
40 50 60 70 80 90 100 110 120 (ºC)
104 122 140 158 176 194 212 230 248 (ºF)
Temperature
13.36 k 2% , B constant 4014 2%
1 1
)} , t: ºC (ºF - 32)/1.8
273+t 373
CN621
CN611
LED3
LED2
LED1
LEV: 12 V DC
pulse wave
De rost thermistor (RT61)
Am ient temperature thermistor (RT65)
Outdoor heat e chan er temperature
thermistor (RT68)
100
90
80
70
60
50
40
30
20
10
0
-20 -10 0 10 20 30
-4 14 32 50 68 86 104
Temperature
Thermistor R25 10 k 2%
B constant 3950 2%
1 1
Rt 10exp 3950(
273+t 298
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
40 (ºC)
(ºF)
)}