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6.4 Electrical Wiring Connection of Indoor Unit and 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 connected to the same outdoor unit.
(Max. capacity of one indoor unit group is 15A.)
Connect an ELB, fuse and main switch (S) to each indoor unit group.
3. Connect the communication wiring between indoor units and outdoor units, as shown in Fig. 6.1 and 6.2.
4. Connect the communication wiring in the same refrigerant cycle unit. (In the case that the refrigerant piping of indoor
unit is connected to the outdoor unit, also connect the communication wiring to the same indoor unit.) Connecting the
refrigerant piping and communication 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 communication wiring.
(Do not use 3-Core or over.)
6. Use the same kind of cables in the same H-LINK system.
7. The communication wiring is required to be separated from the power supply wiring when installed parallel to the power
supply wiring.
Keep at least 5cm between the communication wiring and the power supply wiring, and also min. 1.5m between the
communication 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 it from other wirings. Make sure to ground the end of the power
supply wiring
8. Connect the following communication wiring to the terminals 1 and 2 of TB2 in the outdoor unit A (main unit).
a. between outdoor unit and indoor unit
b. between outdoor unit and outdoor unit in other refrigerant cycles
9. Do not connect the power supply wiring to the terminal block for communication wiring (TB2).
All the printed circuit boards in the same refrigerant cycle will be damaged.
10. Connect the earth wire to the outdoor/indoor units. The earth wiring work under the condition of 100W (max.) ground
resistance must be performed by a qualified person.
11. Connect the communication wiring between outdoor units in the same refrigerant cycle to the terminals 3 and 4 on the
terminal block (TB2).
•
Communication Wiring
< Heat Pump >
Refrigerant Group 1 (Heat Pump System)
Outdoor Unit
(Main)
TB
TB
1
3
L1 L2 L3
N
1 2
Communication Wire
for H-LINK System
L1 L2 N
1 2 A B
TB
TB
1
2
Unit No. 0
Indoor Unit
A16381Z84L-rev.1
Outdoor Unit
(Sub)
TB
TB
TB
TB
2
1
3
1 2 3 4
L1 L2 L3 N
1 2
1 2 3 4
L1 L2 N
1 2 A B
L1 L2 N
TB
TB
TB
1
2
1
Unit No. 1
Indoor Unit
Indoor Unit
Refrigerant Group 2 (Heat Pump System)
TB
2
1
L1 L2 L3 N
Communication Wire
for H-LINK System
1 2 A B
L1 L2 N
1 2 A B
TB
TB
TB
1
2
2
Unit No. 0
Unit No. 2
Indoor Unit
Outdoor Unit
Outdoor Unit
(Main)
TB
TB
TB
3
2
1
1 2
1 2 3 4
L1 L2 L3 N
Communication Wire
for Main-Sub
L1 L2 N
1 2 A B
TB
TB
1
2
Unit No. 1
Indoor Unit
6. Electrical Wiring
(Sub)
TB
TB
3
2
1 2
1 2 3 4
L1 L2 N
1 2 A B
TB
TB
1
2
Unit No. 2
Indoor Unit
78
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