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7.4
Electrical Wiring Connection of Indoor Unit, Outdoor Unit
(1) Connect a power supply wiring to each outdoor unit. Connect an ELB, fuse and main switch (S) to
each outdoor unit.
(2) Connect a power supply wiring to each indoor unit group to be connected to the same outdoor unit.
(Max. capacity of one indoor unit group is 250 KBtu/h.)
Connect an ELB, fuse and main switch (S) to each indoor unit group.
(3) Connect the transmission wiring between indoor units and outdoor units, as shown in Fig. 7.2
and 7.3.
(4) Connect the transmission wiring in the same refrigerant cycle unit. (In case that the refrigerant pipe of
indoor unit is connected to the outdoor unit, connect the transmission wiring to the same indoor unit.)
Connecting the refrigerant pipe and transmission wiring to the different refrigerant cycle systems may
lead to malfunction.
(5) Use 2-Core lead wires such as shielded twist pair cable for the transmission wiring.
(Do not use 3-Core or over.)
(6) Use the same kind of cables for the Hi-NET system of the same refrigerant cycle.
(7) The transmission wiring is required to be separated from the power supply wiring.
Keep at least 5cm between the transmission wiring and the power supply wiring, and also min. 1.5m
between the transmission wiring and power supply wiring for other electrical device. If the above is not
secured, put the power supply wiring into the metal conduit tube to separate from other wirings.
(8) Connect the following transmission wiring to the terminals 1 and 2 of TB2 in the outdoor unit A (main
unit).
• between outdoor unit and indoor unit
• between outdoor unit and indoor unit in other refrigerant cycles
(9) Do not connect the power supply wiring to the terminal board for transmission wiring (TB2).
Printed circuit board may be damaged.
(10) Connect the earth wire for the outdoor/indoor. The earth wiring work under the
condition of 100 (max.) ground resistance should be performed by the qualified person
Transmission Wiring
Outdoor Unit
(Main)
TB
1
L
L
L
N
1
2
3
Hi-NET II
Transmission Wire
B A 2 1
L N E
TB
TB
2
1
Indoor Unit
NOTES:
1. For the combination units (172~460KBtu/h), DSW settings of Main and Sub are required.
2. Alarm occurs if the transmission wires between outdoor units are connected to the terminals 1 and 2 for
Hi-NET II.
3. In case that alarm is indicated on the LCD of Main outdoor unit, follow the "7-segment" indication of the
Main outdoor unit for checking.
4. Perform function setting from Main outdoor unit.
5. Maximum refrigerant groups with one central controller are 64.
Maximum indoor units to be connected are 160.
40
Refrigerant Group 1
Outdoor Unit
(Sub)
TB
TB
TB
2
1
2
1 2 3 4
L
L
L
N
1 2 3 4
1
2
3
B A 2 1
L N E
B A 2 1
L N E
L N E
TB
TB
TB
TB
2
1
2
1
Indoor Unit
Indoor Unit
Refrigerant Group 2
Outdoor Unit
(Main)
TB
TB
1
2
L
L
L
N
1 2 3 4
1
2
3
B A 2 1
L N E
B A 2 1
L N E
TB
TB
TB
TB
2
1
2
1
Indoor Unit
Indoor Unit
Outdoor Unit
(Sub)
TB
TB
1
2
L
L
L
N
1 2 3 4
1
2
3
Transmission Wire
for Main ~ Sub
B A 2 1
L N E
TB
TB
2
1
Indoor Unit
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