23
English
1
2
3
1
Control box cover
2
Inspection door
3
[Service precautions] Label location
NOTE
• Open the slit holes with a cutting nipper or similar tool.
• After cutting the slit holes, it is recommended to remove burrs in the
slit holes and paint the edges and areas around the edges using the
repair paint to prevent rusting.
• When passing wiring through the slit holes, remove burrs around
the slit holes and protect the wiring with protective tape.
•
After passing the wiring, be sure to fill any gap (indicated by the
hatching in the figure below) with sealing material (field supply) to
prevent small animals and dust from entering.
Transmission line
Power line
9.4. Transmission wiring connection procedure
•
Referring to the figure below, connect the transmission wiring be
-
tween outdoor unit and indoor unit, outdoor unit and outdoor unit of
other system, outdoor unit and outdoor unit of same system.
• In order to reduce the risk of PCB failure due to contamination, the
A1P has been sealed off and a relay terminal block X2M will be used
for wire connection. X2M is equivalent of A1P connection below table.
TO IN/D UNIT
TO OUT/D UNIT
TO MULTI UNIT
A1P
F1
F2
F1
F2
Q1
Q2
X2M
X0
X1
X2
X3
X4
X5
A1P X2M
A1P X2M
A1P X2M
5
1
1
2
7
X0 X1 X2 X3 X4 X5
X2M
X4 X5
2
1
4
3
X2M
5
1 2
8
6
:
9
F1 F2
F1 F2
F1 F2
1
Master unit (*)
2
Sub unit (*)
3
Outdoor unit A
4
Outdoor unit B
5
Control box
6
Never connect the power wire.
7
To outdoor unit of other system
8
Use duplex wires (No polarity)
9
Indoor unit
(*) : The outdoor unit that connect the transmission wiring to an
indoor unit is Master unit of the multi system.
And the other units are Sub unit. (In this figure, outdoor
unit A is the Master unit.)
Check operation in installation work, onsite settings and so
on are done by operating the printed circuit board (A1P) of
Master unit.
NOTE
• Do not connect the power wiring to terminals for the transmission
wiring. Doing so would destroy the entire system.
• Wiring to the indoor unit should be wired to X0 and X1 on the out-
door unit’s terminal block (X2M).
• The above wiring should be wired using AWG18-16 stranded, non-
shielded wiring.
• All transmission wiring is to be procured onsite.
See the table below for the tightening torque of the transmission
wiring terminals.
Screw size
Tightening torque
M3.5 (X2M)
0.59-0.71 ft
•
lbf (0.8-0.97 N
•
m)
• Transmission wiring should be done within the following limitations.
If they are exceeded, transmission problems may occur.
1
Between outdoor unit and indoor unit
Between outdoor unit and outdoor unit of other systems
Max. wiring length : 3280 ft. (1000 m)
Max. total wiring length : 6560 ft. (2000 m)
Max. no. of branches : 16
[Note] No branch is allowed after a branch. See the
following figure.
Max. no. of outdoor units of other system that can be con-
nected : 7
a
b
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
a
Branch
b
Branch after branch
2
Between outdoor unit and outdoor unit of same system
Max. wiring length : 98 ft. (30 m)
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