Mitsubishi Electric EHST20C-VM6HA Service Manual page 24

<3 phase>
Power
supply
Earth
3N~
leakage
400V
breaker
50Hz
* Installer MUST affix label A that is included with the manuals near each wiring diagram for cylinder 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 - S
Cylinder unit - Outdoor unit S - 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.
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. The power supply MUST have sufficient capacity for each heater and ALL electrical loads. Insufficient power supply may result in
chattering of load contactor(s).
Power
supply Earth
leakage
~/N
breaker
230V
50Hz
Outdoor unit
L1
Wiring
circuit
L2
breaker
or
L3
Isolating
switch N
Power
supply
3~
400V
50Hz
Power
supply
~/N
230V
50Hz
<Figure 7-5>
Electrical connections 3 phase
Power supply Capacity (Indoor unit Ref.)
3~ 400V 50Hz
~/N 230 V 50 Hz 3kW (E******-VM*H*)
*1
*2
*3
*3
*3
Cylinder unit
TB1
Wiring
L
circuit
breaker
N
or
Isolating
switch
To control
board
S1
S1
S2
S2
S3
S3
ECB1
ELB for
Wiring L1 booster
circuit
heater
L2
breaker
(Primary circuit)
or
L3
Isolating
switch
ECB2
ELB for
Wiring
L
immersion
circuit
heater
breaker
N
or (DHW tank)
Isolating
switch
Breaker
16 A *1
9 kW
16 A *1
~/N 230 V 50 Hz
16 A
 × Min. 1.5
1 × Min. 1.5
 × Min. 0.3
—
AC30V
—
DC4V
4
Wiring
.5 mm²
.5 mm²