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4
Installation
Affix label A that is included with the manuals near each wiring diagram for heat pump units.
Power supply
~/N 230 V 50 Hz
en
Description
Immersion heater (DHW tank)
Water to water unit power supply
Water to water unit circuit breaker capacity
Wiring No. × size (mm²)
Circuit rating
Description
Pressure independent control value (PICV)
*5
*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).
Control board
TBI.4
8 7 6 5 4 3 2 1
1 Control 0-10 V DC
2 Neutral 0 V AC/DC
3 Line 24 V AC/DC
<Figure 4.6.4>
25
Wiring circuit
Earth leak-
age circuit
breaker
Isolating
*1 *2
Wiring circuit
breaker or
Power supply
Isolating
~/N 230 V 50 Hz
Pressure
indepeadent
control valve
<Figure 4.6.3>
Electrical connections 1 phase
Power supply
~/N 230 V 50 Hz
Water to water unit power supply, earth *4
Water to water unit L, N
Power supply
~/N 24 V 50 Hz
TB2
1
2
1
2
3
Pressure Independent
Control Valve (PICV)
TB1
breaker
N.F.
L
switch
N
To control board
ECB2
For
immersion heater
L
(DHW tank)
switch
N
TB2
L
N
Capacity
3 kW
*2
*3
Capacity
500 mA
Breaker abbreviation
TB2
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.
Breaker Wiring *4
16 A *2
2.5 mm²
~/N 230 V 50 Hz
16 A
3 × Min. 1.5
230 V AC
Wiring specification
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
Meaning
Terminal block 2
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