L1
L2
S1
S2
S3
S1
S2
S3
TB1
L2
L3
ECB1
N
L3
L1
L2
L1
Earth
leakage
circuit
breaker
*1
Outdoor unit
Power
supply
3~
400V
50Hz
Wiring
circuit
breaker or
Isolating
switch
To control
board
For
booster
heater
(Primary circuit)
Hydrobox
Wiring
circuit
breaker or
Isolating
switch
Power
supply
3N~
400V
50Hz
25
Installation
4
GB
<3 phase>
<Figure 4.5.6>
Electrical connections 3 phase
Description
Power supply
Capacity
Breaker
Wiring
Booster heater (Primary circuit)
3~ 400V 50Hz
9 kW
16 A *1
2.5 mm²
Wiring
Wiring No. × s
ize
(m
m
²)
Hydrobox - Outdoor unit
*2
3 × 1.5 (polar)
Hydrobox - Outdoor unit earth
*2
1 × Min. 1.5
Circuit rating
Hydrobox - Outdoor unit S1 - S2
*3
230V AC
Hydrobox - Outdoor unit S2 - S3
*3
24V DC
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
*2. Max. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 80 m
*3. The values given in the table above are not always measured against the ground value.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. Indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
Indoor unit power supply cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60227 IEC 53)
3. Install an earth longer than other cables.
4. Please keep enough output capacity of power supply for each heater. The lack of the power supply capacity might cause
chattering.
*1 If the installed earth leakage circuit breaker does not have an over-current protection function, install a breaker with that function along the same
power line.
*2 Affix label A that is included with the manuals near each wiring diagram for hydrobox and outdoor units.