Mitsubishi Electric ecodan EHST20 Série Manuel D'installation page 21

4
installation
<3 phase>
Power
supply
Earth
3N~
leakage
400 V
circuit
50 Hz
breaker
*1
Power supply
3~ 400 V 50 Hz (EH*T20*-yM*B)
3~ 230 V 50 Hz (EH*T20*-tM*B)
*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 B 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 power supply
Cylinder unit input capacity
Main switch (Breaker)
Cylinder unit power supply
Cylinder unit power supply earth
Cylinder unit - Outdoor unit
Cylinder unit - Outdoor unit earth
Cylinder unit L - N
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. 120 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.
Wiring
Power circuit
supply
breaker
Earth
~/N
leakage
230 V
Isolating
circuit
50 Hz switch
breaker
*1
Outdoor unit
Wiring L1
circuit
L2
breaker
or
L3
Isolating
switch
N
Power
supply
~/N
230 V
50 Hz
<Figure 4.6.5>
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
~/N 230 V 50 Hz
*1
*2
*3
*3
*3
Cylinder unit
TB1
L
To control
board
or N
S1
S1
S2
S2
S3
S3
ECB1
Wiring
For
L1
circuit
booster
breaker
heater
L2
or
(Primary circuit)
Isolating
L3
switch
ECB2
For
Wiring
Immersion
L
circuit
heater
breaker
N (DHW tank)
or
Isolating
switch
Wiring
9 kW 16 A *1 2.5 mm²
9 kW 32 A *1 6.0 mm²
3 kW 16 A *1 2.5 mm²
16 A
2 × Min. 1.5
1 × Min. 1.5
2 × Min. 0.3
—
230 V AC
—
24 V DC
20