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7
Water to Water Heat Pump (WTW)
Affix label A that is included with the manuals near each wiring diagram for heat pump units.
Power supply
~/N 230 V 50 Hz
Power supply
~/N 230 V 50 Hz
Description
Immersion heater (DHW tank)
Water to water unit power supply
Water to water unit circuit breaker capacity
Wiring No. × size (mm²) Water to water unit power supply, earth
Circuit rating
Water to water unit L, N
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
Control 0-10 V DC
Neutral 0 V AC/DC
Line 24 V AC/DC
<Figure 7.4.4>
Wiring circuit
Earth leak-
breaker
age circuit
N.F.
breaker
Isolating
*1 *2
switch
Wiring circuit
breaker or
Isolating
switch
Pressure
indepeadent
control valve
<Figure 7.4.3 >
Electrical connections 1 phase
Power supply
~/N 230 V 50 Hz
Power supply
~/N 24 V 50 Hz
TB2
1
2
Pressure Independent
Control Valve (PICV)
TB1
L
N
To control board
ECB2
For
immersion heater
L
(DHW tank)
N
TB2
L
N
Capacity
Breaker
3 kW
16 A *2
~/N 230 V 50 Hz
*2
*4
3 × Min. 1.5
*3
230 V AC
Capacity
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
Breaker abbreviation
TB2
Terminal block 2
Connections should be made to the terminals indicated in Figure
7.4.4.
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.
Wiring *4
2.5 mm²
16 A
Wiring specification
Meaning
B-213
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