Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 20

5 Installation
5.7.3 Establishing the power supply
1. Provide one common power supply for the boiler and
for the corresponding control:
–
Power supply: Single-phase, 230 V, 50 Hz
– Fuse protection: ≤ 3 A
2. Observe all valid regulations.
–
The applicable regulations state that the connection
must be made via an electrical partition with a con-
tact gap of at least 3 mm at each pole.
3. Use a flexible line for the power supply cable, which is
routed through the grommet into the product.
4. Carry out the wiring. (→ Page 19)
5. Screw the supplied plug to a three-core power supply
cable that complies with the relevant standards.
6. Plug the plug for the connection cable into the slot 230V
on the main PCB.
7. Close the electronics box. (→ Page 19)
8. Make sure that access to the power supply is always
available and is not covered or blocked.
5.7.4 Connecting controls to the electronics
24V=
230V~
1. Open the electronics box. (→ Page 19)
2. Carry out the wiring. (→ Page 19)
Alternatives 1 ‒ Connecting the weather-com-
3.
pensated eBUS control or eBUS room temper-
ature control:
▶
Connect the control to the BUS plug.
▶
Bridge the 24V=RT plug if it is not already bridged.
20
≤ 30
mm
– +
Burner 24V=
BUS
off RT
Installation and maintenance instructions ecoTEC plus 0020261389_02
Alternatives 2 ‒ Connecting a 24 V extra low
3.
voltage room temperature control:
▶
Instead of the bridge, connect the control to the 24 V
plug.
Alternatives 3 ‒ Connecting limit thermostats
3.
for the underfloor heating:
▶
Connect the limit thermostat to the Burner off plug
instead of the bridge.
Alternatives 4 ‒ Connecting the 230 V low
3.
voltage room temperature control:
▶
Connect the control to the L main plug and to the RT
plug.
▶
Remove the bridge from the 24V=RT plug.
4. Close the electronics box.
5. To trigger the Comfort pump operating mode (pump
runs permanently) using a multi-circuit control, change
the diagnostics code D.018 pump operating mode from
Eco (pump runs intermittently) to Comfort. (→ Page 30)
5.7.5 Connecting the hydraulic accessory
▶
Connect the hydraulic accessory in accordance with the
selected basic system diagram. (→ Page 12)
5.7.6 Connecting additional components
You can use the integrated additional relay to actuate an
additional component.
You can use the optional multi-functional module to actuate
two further additional components.
5.7.6.1 Using the additional relay
1. Connect an additional component directly to the integ-
rated additional relay using the grey plug on the PCB.
2. Carry out the wiring. (→ Page 19)
3. Select D.026 to actuate the connected component.
(→ Page 29)
≤ 30
mm