Electrical Installation - Vaillant ecoTEC pro VUW 6/5-3 Series Installation And Maintenance Instructions Manual

7.9

Electrical installation

The electrical installation must only be carried out by a quali-
fied electrician.
Danger!
Risk of death from electric shock!
Power supply terminals L and N remain live
even if the on/off button is switched off:
▶
Disconnect the product from the power
supply by switching off all power supplies
at all poles (electrical partition with a con-
tact gap of at least 3 mm, e.g. fuse or cir-
cuit breaker).
▶
Secure against being switched back on
again.
▶
Wait for at least 3 minutes until the capa-
citors have discharged.
▶
Check that there is no voltage.
7.9.1 Opening the electronics box
▶
Open the electronics box as shown in the illustration.
7.9.2 Carrying out the wiring
Caution.
Risk of material damage caused by incor-
rect installation.
Mains voltage at incorrect terminals and plug
terminals may destroy the electronics.
▶
Do not connect any mains voltage to the
eBUS terminals (+/-).
▶
Only connect the mains connection cable
to the terminals marked for the purpose.
1. Route the connection cables of the components to be
connected through the grommet provided on the under-
side of the product on the left.
2. Use strain reliefs.
3. If required, shorten the connection cables.
24
30 mm
≤
4. Strip the flexible line as shown in the figure. In doing so,
ensure that the insulation on the individual conductors
is not damaged.
5. Only strip inner conductors just enough to establish
good, sound connections.
6. To avoid short circuits resulting from loose individual
wires, fit conductor end sleeves on the stripped ends of
the conductors.
7. Screw the respective plug to the connection cable.
8. Check whether all conductors are sitting mechanically
securely in the terminals of the plug. Remedy this if
necessary.
9. Plug the plug into the associated PCB slot; see the wir-
ing diagram in the appendix.
7.9.3 Establishing the power supply
Caution.
Risk of material damage due to high con-
nected voltage.
At mains voltages greater than 253 V, elec-
tronic components may be damaged.
▶
Make sure that the rated voltage of the
mains is 230 V.
1. Observe all valid regulations.
2. Make sure that the nominal mains voltage is 230 V.
3. 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
4. Do not interrupt the mains supply with a time switch or
programmer.
5. Open the electronics box. (→ Page 24)
6. Connect the product using a fixed connection and an
electrical partition with a contact gap of at least 3 mm
(e.g. fuses or power switches).
7. Isolation should preferably be by a double pole
switched fused spur box having a minimum contact
separation of 3 mm on each pole. The fused spur box
should be readily accessible and preferably adjacent to
the boiler. It should be identified as to its use.
8. Route a three-core power supply cable that complies
with the relevant standards through the grommet and
into the product.
–
Power supply cable: Flexible duct
9. Carry out the wiring. (→ Page 24)
10. Remove the supplied plug from the bracket in the elec-
tronics box and screw the plug onto the power supply
cable.
11. Close the electronics box.
12. Make sure that access to the power supply is always
available and is not covered or blocked.
Installation and maintenance instructions ecoTEC pro 0020244995_04