4
7
7.3
[Fig. 7.3.1]
I
Control box
J
Bottom panel
I
Control Box
J
Bottom panel
<A> Model 250
<B> Model 500
A
Transformer
A
Transformer
E
Connect trasmission
line to outdoor unit
D
Fix in place after
connecting writing.
F
To power supply
B
External I/O board
H
Fuse
G
Earth
D
No.2 Transmission line
terminal block
(Note: Connect to top
terminal block)
C
No.1 Transmission line
terminal block
E
Connect trasmission line
to outdoor unit
F
Fix in place after connecting writing.
G
Earth
B
External I/O board
C
Transmission line
terminal block
H
Fuse
[Fig. 7.3.2]
Connection changes to be made when connected to a 2-refrigerant circuit.
Switch setting changes to be made when connected to a 2-refrigerant circuit.
When connected to
a 2-refrigerant circuit
When connected to
a 2-refrigerant circuit
Remove the LEV2B connector
from the adapter board, and
connect it to CN60 on No. 2 board.
CN60
6 5 4 3 2 1
6
5
4
3
2
1
CN3A
CN2M
1
2
2
1
3
No. 2 board
Connect the connectors to
CN3A and CN2M on No. 2 board.
When connected to a
single-refrigerant circuit
(factory setting)
When connected to t a
2-refrigerant circuit
Model 500
SW2
SW3
SW4
ON
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4 5 6 7 8 9 10
ON
ON
ON
ON
ON
LEV2
M
External input-output
board (IFB)
AC
A1
A2
BC
B1
B2
The case of with-voltage input ... A
The case of no-voltage input .... B
A
B
TB23
TB21
When using the external input function on the
indoor unit that is connected to a two-refrigerant
circuit, connect the short-circuit plate that is
supplied with the unit to the appropriate terminals
on the external input-output board.
