Mitsubishi Electric ecodan EHST20 Série Manuel D'installation page 19

4
installation
<3 phase>
Power
supply
3N~ Earth
400 V
leakage
50 Hz circuit
breaker
*1
*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 cylinder unit and outdoor units
description
Booster heater (Primary circuit)
Immersion heater (DHW tank)
Cylinder unit - Outdoor unit
Cylinder unit - Outdoor unit earth
Cylinder unit - Outdoor unit S1 - S2
Cylinder unit - 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.
note: 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.
Outdoor unit
L1
Wiring
L2
circuit
breaker
L3
or
Isolating
N
switch
Power supply
3~ 400 V 50 Hz (EH*T20*-yM*B)
3~ 230 V 50 Hz (EH*T20*-tM*B)
Power
supply
~/N
230 V
50 Hz
Electrical connections 3 phase
Power supply Capacity (indoor unit ref.) Breaker
3~ 400 V 50 Hz
3~ 230 V 50 Hz
~/N 230 V 50 Hz
*2
*2
*3
*3
Cylinder unit
TB1
L
N
To control
board
S1
S1
S2 S2
S3 S3
ECB1
For
L1
booster
Wiring
heater
circuit
L2
(Primary circuit)
breaker
or
L3
Isolating
switch
ECB2
For
Immersion
L
Wiring
heater
circuit
(DHW tank)
N
breaker
or
Isolating
switch
<Figure 4.6.2>
9 kW 16 A *1
9 kW 32 A *1
3 kW 16 A *1
3 × 1.5 (polar)
1 × Min. 1.5
230 V AC
24 V DC
Wiring
2.5 mm²
6.0 mm²
2.5 mm²
18