L1
L2
S1
S2
S3
S1
S2
S3
TB1
L2
L3
ECB1
ECB2
N
L3
L1
L
N
L
N
28
OCH714D
<3 phase>
<Figure 7-5>
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
Cylinder unit power supply
~/N 230 V 50 Hz
Cylinder unit input capacity
Main switch (Breaker)
*2
16 A
Wiring No.
× size (mm²)
Cylinder unit power supply
2 × Min. 1.5
Cylinder unit power supply earth
1 × Min. 1.5
Cylinder unit - Outdoor unit
*3
2 × Min. 0.3
Cylinder unit - Outdoor unit earth
—
Circuit rating
Cylinder unit L - N
*4
230 VAC
Cylinder unit - Outdoor unit S1 - S2
*4
—
Cylinder unit - Outdoor unit S2 - S3
*4
24 VDC
*3.
Maximum 120 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.
For
booster
heater
(Primary circuit)
For
Immersion
heater
(DHW tank)
To control
board
*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.
A breaker with at least 3.0 mm contact sep
-
aration in each pole shall be provided. Use
earth leakage breaker (NV).
The breaker shall be provided to ensure dis-
connection of all active phase conductors of
the supply.
Affix label B that is included with the manuals near each
wiring diagram for cylinder unit and outdoor units.
Wiring
circuit
breaker
or
Isolating
switch
Earth
leakage
circuit
breaker
*1, *2
Wiring
circuit
breaker
or
Isolating
switch
Earth
leakage
circuit
breaker
*1, *2
Outdoor unit
Cylinder unit
Wiring
circuit
breaker
or
Isolating
switch
Wiring
circuit
breaker
or
Isolating
switch
Power supply
3~
400 V
50 Hz (E**T***-
Y
M9*D)
3~
230 V
50 Hz (E**T***-
T
M9*D)
Power supply
~/N 230 V 50 Hz
Power supply
~/N 230 V 50 Hz
Power supply
3N~ 400 V 50 Hz