TB1
L
N
ECB2
L
N
TB2
L
N
Installation
4
25
en
8 7 6 5 4 3 2 1
1
2
<Figure 4.6.3>
Electrical connections 1 phase
Affix label A that is included with the manuals near each wiring diagram for heat pump units.
Earth leak-
age circuit
breaker
*1 *2
Pressure
indepeadent
control valve
Wiring circuit
breaker
N.F.
Isolating
switch
Power supply
~/N 230 V 50 Hz
Power supply
~/N 230 V 50 Hz
Wiring circuit
breaker or
Isolating
switch
To control board
For
immersion heater
(DHW tank)
Description
Power supply
Capacity
Breaker Wiring *4
Immersion heater (DHW tank)
~/N 230 V 50 Hz
3 kW
16 A *2
2.5 mm²
Water to water unit power supply
~/N 230 V 50 Hz
Water to water unit circuit breaker capacity
*2
16 A
Wiring No. × size (mm²)
Water to water unit power supply, earth *4
3 × Min. 1.5
Circuit rating
Water to water unit L, N
*3
230 V AC
Description
Power supply
Capacity
Wiring specification
Pressure independent control value (PICV)
*5
~/N 24 V 50 Hz
500 mA
Use sheathed vinyl coated cord or cable.
Wire type: CV, CVS or equivalent
Wire size: Stranded wire 0.13 mm² to 0.52 mm²
Solid wire: ø0.4 mm to ø0.8 mm
*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.
*3. The values given in the table above are not always measured against the ground value.
*4. Use wires in conformity with design 60245 IEC 57.
*5. External wiring length to PICV is less than 2 m.
Note: 1. Wiring size must comply with the applicable local and national codes.
2. Install an earth longer than other cables.
3. Please keep enough output capacity of power supply for each heater. Insufficient power supply capacity might
cause chattering.
4. Stranded wire should be processed with insulation-covered bar terminal (DIN46228-4 standard compatible type).
Breaker abbreviation
Meaning
TB2
Terminal block 2
Connections should be made to the terminals indicated in Figure 4.6.4.
If connecting the PICV, attend to the following points.
• External wiring length to PICV is less than 2 m.
• Tighten the TBI 4.7 pin wiring and the PICV (0 V AC/DC) wiring
together to TB2.
Control board
<Figure 4.6.4>
1 2 3
Pressure Independent
Control Valve (PICV)
1
Control 0-10 V DC
2
Neutral 0 V AC/DC
3
Line 24 V AC/DC
TBI.4
TB2
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