Mitsubishi Electric Ecodan EHSC series Installation Manual page 26

4
Installation
<3 phase>
Power
supply
3N~
400V
50Hz
*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.
Description
Booster heater (Primary circuit)
Hydrobox - Outdoor unit
Hydrobox - Outdoor unit earth
Hydrobox - Outdoor unit S1 - S2
Hydrobox - Outdoor unit S2 - S3
*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.
25
Earth
Wiring
leakage
circuit
circuit
breaker or
breaker
Isolating
*1
switch
Power
supply
3~
400V
50Hz
Electrical connections 3 phase
Power supply Capacity Breaker
3~ 400V 50Hz 9 kW
*2 3 × 1.5 (polar)
*2 1 × Min. 1.5
*3 230V AC
*3 24V DC
Outdoor unit
L1 S1
L2
S2
L3
S3
N
Wiring
circuit
breaker or
Isolating
switch
<Figure 4.5.6>
Wiring
16 A *1 2.5 mm²
Hydrobox
TB1
L1
L2
To control
board
S1
S2
S3
ECB1
For
L1
booster
heater
L2
(Primary circuit)
L3