61
Communication power supply
D71 Voltage
24V DC
CNS
S1-S2: 220-240V AC
(Branch box/outdoor
unit connecting wire)
CNAC
2
to
4
: Power supply for
outdoor controller circuit
board (220V-240V AC)
1
to
3
: Power supply for
indoor and outdoor unit
connection wire
(220-240V AC)
CNF1, CNF2
Connect to the fan motor
1
-
4
: 280V DC
5
-
4
: 15V DC
6
-
4
: 0-6.5V DC
7
-
4
: 15V DC(When stopped)
7.5V DC(When operated)(0V-15V pulse)
21S4
Four-way valve
63H
High pressure
switch
SV1
Solenoid valve 1
CN4
Transmission to out-
door power circuit
board (CN4)
SW4
Test operation
SW6
Model select
SW5
Function switch
SW1
Forced defrost,
detect history record reset
CNDM
1
to
2
:
Input of low noise
mode
1
to
3
:
Input of external con-
tact point
TH4
Thermistor
<Discharge>
TH3
Thermistor
<Outdoor pipe>
TH7/6
Thermistor
<Outdoor/
2-phase pipe>
CNDC
280V DC (
1
+,
3
-)
Connect to outdoor power circuit
board(CNDC)
+ -
V
FG
(TEST POINT
4
)
(Voltage between
right pins of PC5C
and PC5D, pin 3
and pin 4)
(Same as
(CNF1
7
(+)-
4
(-))
V
SP
(TEST POINT
3
)
(Voltage between pins
of C5A, C5B): DC 0V
(when stopped), DC 1–
6.5V
(when operated)
SW7
CN51
SW8
CN2
Connect to the outdoor
power circuit board (CN2)
1
-
5
: Reception from
power circuit board
2
-
5
: Zero cross signal
(0-5V DC)
3
,
4
: Not used
6
-
5
: 16V DC
7
-
5
: 16V DC
CN52C
(Connect to the noise
filter circuit board
(CN52C))
Outdoor controller circuit board
MXZ-8A140VA
3
<CAUTION> TEST POINT
1
is high voltage.
SW9
SW2
63HS
High pressure sen-
sor
63L
Low pressure switch
SV2
Solenoid valve 2
LED
CN3S
OC316D--3.qxp 07.8.24 2:08 PM Page 61
