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II-11
SM831148
1
2
3
4
5
6
2. Processes and functions
3P plug (black): Terminal plug for the communications line
• At the time of shipment from the factory, the short-circuiting socket (2P, black) is
installed between pins 1 and 2 on the terminal plug (terminal = yes).
• When central control is used for multiple systems, leave the short-circuiting socket in
place only on the outdoor unit with a system address of 1. At all other outdoor units
(other than unit No. 1), move the short-circuiting socket to between 2 and 3 (terminal =
no). If multiple short-circuiting sockets remain in place during central control, a com-
munications failure will occur.
• In the case of a single system only (system address = 0), do not remove the short-
circuiting socket. (Alarm "E04" will occur.)
2P plug (white): Enables operation in quiet mode.
• The outdoor unit fan and compressor frequencies are subject to limits during operation.
• Low-noise operation is enabled when the relay is turned ON.
Outdoor unit control PCB
Note 1: The maximum length of the wiring between the outdoor unit PCB and the relay is
2 m.
• Lead wire with 2P plug (special-order part: WIRE K/ 623-161-2098)
• Relay, field supply, contact input specifications: DC 5 V, 0.5 mA (Recommended relay:
Fuji Electric HH62SW, compatible with micro contacts)
• Use a commercially available timer (such as the Omron H5 daily time switch).
Terminal plug
(CN015)
Quiet mode
(CN028)
Example of wiring
1
2
CN028
1
2
Quiet mode
Relay (field supply)
Power
External contact
(timer input, etc.: field supply)
Table 1. Method of System Address Setting
[S002 (rotary, black), S003 (2P DIP switch, green or blue)]
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
2P (20s-digit place)
Outdoor system
address No.
1 system only
Central
control
S002 setting
(system address switch)
S003 setting
1P (10s-digit place)
System
controller
Out-
door
Out-
door
Out-
door
Out-
door
In-
door
In-
door
In-
door
In-
door
Fig. 6