Field Wiring - Mitsubishi Electric EHST20C-VM2C.UK Service Manual

7

FIELD WIRING

Breaker abbreviation Meaning
ECB1 Earth leakage circuit breaker for booster heater
ECB2 Earth leakage circuit breaker for immersion heater
TB1 Terminal block 1
Option 1: Cylinder unit powered via outdoor unit
<1 phase>
Affix label A that is included with the manuals near each
wiring diagram for cylinder unit and outdoor units.
Power
supply
~/N
230 V
50 Hz
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. Insufficient power supply capacity might cause chattering.
OCH570
Wiring
circuit
breaker
Earth
or
leakage
Isolating
circuit
switch
breaker
*1
Power
supply
~/N
230 V
50 Hz
Power
supply
~/N
230 V
50 Hz
<Figure 7-1>
Electrical connections 1 phase
Power supply
~/N 230 V 50 Hz
~/N 230 V 50 Hz
*2
*2
*3
*3
Cylinder unit
TB1
L
Outdoor unit
N
To control
board
L S1
S1
S2
N
S2
S3
S3
ECB1
For
booster
L
Wiring
heater
circuit
N (Primary circuit)
breaker or
Isolating
switch
ECB2
For
Immersion
L
Wiring
heater
circuit
N (DHW tank)
breaker or
Isolating
switch
Capacity Breaker
2 kW 16 A *1
6 kW 32 A *1
3 kW 16 A *1
3 × 1.5 (polar)
1 × Min. 1.5
230 V AC
24 V DC
17
*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.
Wiring
2.5 mm²
6.0 mm²
2.5 mm²