26
OCH714D
L1
L2
S1
S2
S3
TB1
L2
L3
ECB1
L
N
ECB2
N
L3
L1
S1
S2
S3
L
N
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 (E**T***-YM9*D)
3~
230 V
50 Hz (E**T***-TM9*D)
Power supply
~/N 230 V 50 Hz
Wiring
circuit
breaker
or
Isolating
switch
Wiring cir-
cuit 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 No.
× size
(mm²)
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 VAC
Cylinder unit - Outdoor unit S2 - S3
*4
24 VDC
*3.
Max. 45 m
If 2.5 mm² used, Max. 50 m
If 2.5 mm² used and S3 separated, Max. 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.
Affix label A that is included with the manuals near each
wiring diagram for cylinder unit and outdoor units.
*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 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.
