Outdoor Control P.c. Board - Mitsubishi Electric MXZ-2F33VF-E1 Service Manual

2. Outdoor control P.C. board

MXZ-3F54VF MXZ-3F68VF
MXZ-4F72VF
CN741
Signal translation
(To Communication
adaptor board)
V (Rotate signal)
FG
(Voltage between
right pins of PC931,
pin 3 and pin 4)
(Correspond to
V (Rotate instruction)
SP
(Voltage between pins
of C930): 0 V DC
(when stopped),
1.8 - 6.5 V DC
(when operated)
(Same as
CNF1
To fan motor
Bus-bar voltage
290 - 370 V DC
15 V DC
Rotate instruction
(Constant voltage)
Rotate signal
(Pulse wave)
CNDC
Bus-bar
voltage
290 - 370
V DC
CN63H
High
pressure
switch
OBH790
Serial signal 12 ~ 24 V
Room B
220 - 230 - 240 V AC
Room A Room C
Input
CN601
LEV: 12 V DC
pulse wave
84
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
Room D
CN621
CN611
LED3
LED2
LED1
Discharge temperature thermistor (RT62)
800
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100 110 120
100
90
80
70
60
50
40
30
20
10
0
-20 -10 0 10 20 30
Temperature
Thermistor R25 = 10 k ± 2%
B constant = 3950 ± 2%
1
Rt = 10exp{3950(
273+t 298
F711 FUSE
T3.15AL250V
CNAC
to outdoor power P.C. board
220 - 230 - 240 V AC
Input
CN714 Defrost heater
220 - 230 - 240 V AC
Output
CN713 Valve coil
220 - 230 - 240 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
Temperature( )
Thermistor R100 = 13.36 k ± 2%
B constant = 4014 ± 2%
1 1
Rt = 13.36exp{4014( )}
273+t 373
40 (ºC)
1
)}