Field Wiring - Mitsubishi Electric EHST20C-VM6HB Service Manual

7

FIELD WIRING

Breaker abbreviation Meaning
Earth leakage circuit breaker for booster heater
ECB1
Earth leakage circuit breaker for immersion heater
ECB
TB1 Terminal block 1
Option 1: Cylinder unit powered via outdoor unit
<1 phase>
Power
supply
~/N
0V
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 which 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 - S
Cylinder unit - Outdoor unit S - S
*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. Insufficient power supply capacity might cause chattering.
OCH531
Wiring
circuit
breaker
Earth
or
leakage
Isolating
circuit
switch
breaker
*1
Power
supply
~/N
0V
50Hz
Power
supply
~/N
0V
50Hz
<Figure 7-1>
Electrical connections 1 phase
Power supply Capacity (Indoor unit Ref.) Breaker
~/N 230 V 50 Hz
 kW (EHPT0X-VMH*)
6 kW (EH*T0*-VM6**)
~/N 230 V 50 Hz
 kW (EH*T0*-VM*H*)
*  × 1.5 (polar)
* 1 × Min. 1.5
*
*
Cylinder unit
TB1
L
Outdoor unit
N
To control
board
L S1
S1
S2
N S2
S3
S3
ECB1
For
L
Wiring booster
heater
circuit
N
(Primary circuit)
breaker or
Isolating
switch
ECB2
For
L
Wiring Immersion
heater
circuit
N
(DHW tank)
breaker or
Isolating
switch
Wiring
16 A *1 .5 mm²
 A *1 6.0 mm²
16 A *1 .5 mm²
0V AC
4V DC
4