Mitsubishi EHST20C-VM2C Service Manual page 37

<3 phase>
Affix label B that is included with the manuals near
each wiring diagram for cylinder unit and outdoor units.
Earth
leakage
Power
circuit
supply
breaker
3N~
1, 2
* *
400 V
50 Hz
Power supply
3~ 400 V 50 Hz (EH*T20*-YM*C)
3~ 230 V 50 Hz (EH*T20*-TM*C)
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
A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
* 2
The breaker shall be provided to ensure disconnection of all active phase conductors of the supply.
3 Maximum 120 m
*
The values given in the table above are not always measured against the ground value.
* 4
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 line longer than power cables.
4. Please keep enough output capacity of power supply for each heater. Insufficient power supply capacity might cause chattering.
OCH570C
Earth
leakage
breaker
Power
circuit
supply
breaker
Isolating
~/N
1, 2
* *
230 V
50 Hz
Outdoor unit
L1
Wiring
circuit
L2
breaker
or
L3
Isolating
switch
N
Power
supply
~/N
230 V
50 Hz
<Figure 7-5>
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
2
*
* 3
* 4
4
*
4
*
Cylinder unit
TB1
Wiring
circuit
L
To control
or
board
N
switch
S1 S1
S2 S2
S3 S3
ECB1
Wiring
For
L1
circuit
booster
breaker
heater
L2
or
(Primary circuit)
Isolating
L3
switch
Wiring
ECB2
circuit
For
breaker
L Immersion
or
heater
Isolating
N (DHW tank)
switch
Wiring
9 kW 16 A
* 2
9 kW 32 A
* 2
3 kW 16 A
* 2
16 A
2 × Min. 1.5
1 × Min. 1.5
2 × Min. 0.3
—
230 V AC
—
24 V DC
37
If the installed earth leakage circuit breaker
* 1
does not have an over-current protection
function, install a breaker with that function
along the same power line.
2.5 mm²
6.0 mm²
2.5 mm²