Mitsubishi Electric MXZ-2E53VAHZ, Service Manual

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92
CN601
230 VAC
Room A
Input
Room B
Room C
Room D
Defrost thermistor
(RT61)
Discharge temperature
thermistor (RT62)
Outdoor heat exchanger
temperature thermistor
(RT68)
CNTH1
CNTH2
Ambient temperature
thermistor
(RT65)
SW1
LED3
LEV: 12 VDC
pulse wave
LED2
LED1
SW2
SW871
CN712 R.V. coil
230 VAC
Output
CN713 Valve coil
230 VAC
Output
MXZ-4E83VAHZ
CN714 Defrost heater
230 VAC
Output
CNAC
to outdoor power P.C.
board 230 VAC
Input
F711 FUSE
T3.15AL250V
CN611
Serial signal 12 ~ 24 V
CN621
CN791 LEV Room
A
(
CN792 LEV Room B CN794 LEV Room D CN797 LEV R except
MXZ-4E83V
AHZ
(-)
CN701 Signal transmission (T
o power board)
5 VDC pulse wave
CN702 Signal transmission (T
o power board)
5 VDC pulse wave
CN793 LEV Room C
(+)
(+)
(-) (-)
15 V
*
V
(-)
CN63H
High
pressure
switch
CNDC
Bus-bur
voltage
290 ~ 370
VDC
Bus-bur voltage
290 ~ 370 VDC
15 VDC
CN930
To fan motor
V
FG
(Rotate signal)
(Voltage between
right pins of PC931,
pin 3 and pin 4)
(Correspond to
&1)í
V
SP
(Rotate instruction)
(Voltage between pins
of C930): 0 V DC
(when stopped),
1.8 - 6.5 V DC
(when operated)
(Same as
&1)í
CN741
Signal translation
(To Communication
adaptor board)
*
V
15 V
:
MXZ-3E54V
A
MXZ-3E68V
A
MXZ-4E72V
A
18 V
:
MXZ-4E83V
AHZ
0
100
200
300
400
500
600
700
800
0 10 20 30 40 50 60 70 80 90 100 110 120
Temperature( )
Discharge temperature thermistor (RT62)
Resistance(k )
Thermistor R100 = 13.36 k Ÿ ± 2%
B constant = 4014 ± 2%
Rt = 13.36exp{4014( )}
273+t
1
373
1
-20 -10 0 10 20 30 40 (ºC)
100
90
80
70
60
50
40
30
20
10
0
5HVLVWDQFHNŸ
Temperature
273+t
1
298
1
Thermistor R25 = 10 k Ÿ ± 2%
B constant = 3950 ± 2%
Rt = 10exp{3950( )}
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
MXZ-3E54VA MXZ-3E68VA
MXZ-4E72VA MXZ-4E83VAHZ
11-7. TEST POINT DIAGRAM AND VOLTAGE
1. Outdoor control P.C. board
OBH723C