Table of Contents
Advertisement
6. Electrical Wiring
NOTES:
•
Follow the local codes and regulations when selecting field wires.
•
The wire sizes marked with
the unit according to the European Standard, EN60 335-1. Use the wires which are not lighter than the
ordinary tough rubber sheathed flexible cord (code designation H05RN-F) or ordinary polychloroprene
sheathed flexible cord (code designation H05RN-F).
•
The wire sizes marked with
the unit according to the wire, MLFC (Flame Retardant Polyflex Wire) manufactured by Hitachi Cable
Ltd., Japan.
•
Use a shielded cable for the transmitting circuit and connect it to the ground.
•
In the case that power cables are connected in series, add apply maximum current to each unit and
select appropriate wires in the table below.
Selection According to EN60 335-1
Current i (A)
i ≤
6
6
< i ≤
10
10
< i ≤
16
16
< i ≤
25
25
< i ≤
32
32
< i ≤
40
40
< i ≤
63
63
< i
*3. In the case that the current exceeds 63 A,
use MLFC cables.
When the field ambient is around 30 °C.
NOTE:
•
Use 2-core cable (equivalent to following cables: VCTF, VCT, CVV, MVVS, VVR or VVF, size: 0.75 mm
2
1.25 mm
(manufactured by Hitachi Cable Co. Ltd.)) or 2-core twist pair cable (equivalent to following
cables: KPEV or KPEV-S (manufactured by HITACHI Cable Co. Ltd.)) for the control cable between the
outdoor unit and the indoor unit.
The total communication wiring length between the indoor unit and the outdoor unit should be less
than 1000 m and the total communication wiring length between outdoor units should be less than 30m.
CAUTION
•
Install a multi-pole main switch with a space of 3.5 mm or more between each phase.
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.
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.)
52
*1
in the table of the previous page are selected at the maximum current of
*2
in the table of the previous page are selected at the maximum current of
Selection According to MLFC (at Cable Temperature of 90 °C,
Field Ambient Temperature 52°C and Cables are Tied Together)
2
Wire Size (mm
)
0.75
1
1.5
2.5
4
6
10
*3
3
Current i (A)
i ≤
12
12
< i ≤
15
15
< i ≤
22
22
< i ≤
30
30
< i ≤
40
40
< i ≤
50
50
< i ≤
72
72
< i ≤
95
95
< i ≤ 115
115 < i ≤ 133
NOTE:
When the field ambient is high, for example 48 °C.
2
Wire Size (mm
)
0.75
1.25
2
3.5
5.5
8
14
22
30
38
2
to
Advertisement
Table of Contents
