L1
L2
S1
S2
S3
TB1
L2
L3
ECB1
L
N
ECB2
N
L3
L1
S1
S2
S3
L
N
35
Power
supply
3N~
400 V
50 Hz
Earth
leakage
circuit
breaker
*
1,
*
2
Wiring
circuit
breaker
or
Isolating
switch
Power supply
3~
400 V
50 Hz (EH*T20*-
Y
M*C)
3~
230 V
50 Hz (EH*T20*-
T
M*C)
Power
supply
~/N
230 V
50 Hz
Wiring
circuit
breaker
or
Isolating
switch
Wiring
circuit
breaker
or
Isolating
switch
For
booster
heater
(Primary circuit)
For
Immersion
heater
(DHW tank)
To control
board
Outdoor unit
Cylinder unit
<3 phase>
<Figure 7-2>
Electrical connections 3 phase
Description
Power supply
Capacity (Indoor unit Ref.) Breaker
Wiring
Booster heater (Primary circuit)
3~ 400 V 50 Hz
9 kW
16 A
*
2
2.5 mm²
3~ 230 V 50 Hz
9 kW
32 A
*
2
6.0 mm²
Immersion heater (DHW tank)
~/N 230 V 50 Hz
3 kW
16 A
*
2
2.5 mm²
Wiring
Wiring
No.
×
siz
e
(m
m
²)
Cylinder unit - Outdoor unit
*
3
3 × 1.5 (polar)
Cylinder unit - Outdoor unit earth
*
3
1 × Min. 1.5
Circuit
rating
Cylinder unit - Outdoor unit S1 - S2
*
4
230 V AC
Cylinder unit - Outdoor unit S2 - S3
*
4
24 V DC
*
2
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.
*
3
Maximum 45 m
If 2.5 mm² is used, maximum 50 m.
If 2.5 mm² is used and S3 is separated, maximum 80 m.
*
4
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 line longer than power cables.
4. Please keep enough output capacity of power supply for each heater. Insufficient power supply capacity might cause chattering.
*
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.
Affix label A that is included with the manuals near each
wiring diagram for cylinder unit and outdoor units.
OCH570C
Summary of Contents for EHPT20X-MHCW
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