Inspection and maintenance
ecoTEC plus installation and maintenance instructions 0020134823_01 45
13
13.1.1 General inspection and maintenance
instructions
Procuring spare parts
> If you require spare parts for servicing or repair work,
use only Vaillant genuine spare parts.
The original components of the unit were also certified as
part of the CE declaration of conformity. If you do not use
certified Vaillant genuine spare parts, this voids the CE con-
formity of the unit. We therefore strongly recommend that
you fit Vaillant genuine spare parts.
You can find information about available Vaillant genuine
spare parts from the contact address provided on the
reverse of this document.
During an inspection or maintenance procedure, as well as
after replacing components in the combustion circuit, the
following checks must be performed:
– The boiler has been installed in accordance with the cor-
responding installation instructions.
– The condition of the flue gas system and the flue gas
seals corresponds to the enclosed instructions for the
flue gas system.
– Visual inspection of the combustion circuit of the boiler
and the associated seals.
– The maximum gas connection pressure (gas flow pres-
sure) corresponds to the information in ¬section9.6.3.
– Correctness of the current, water and gas connections.
– Correctness of the water pressure.
– Condition of the overall system, in particular the condi-
tion of the radiator valves, indications of leaks in the
heating installation or dripping water taps.
> Eliminate any faults before continuing.
13.1.2 Safety information
e
Danger!
Risk of injury and death from electric
shock!
Even when the boiler is switched off, mains
voltage is still present at the power connec-
tion terminals of the boiler.
> Avoid any contact with the power con-
nection terminals.
> Protect the switch cabinet from water,
especially from being splashed.
> Before any work on the boiler, switch off
the power supply and secure the boiler
against being switched back on acciden-
tally.
i
For certain inspection and maintenance work,
the electrics of the boiler must remain activated;
this is specified in the description of the respec-
tive maintenance task.
Before starting any inspection and maintenance work, per-
form the following steps:
> Switch off the main switch.
> Disconnect the boiler from the power supply by
– removing the mains plug or
– de-energising the boiler with an isolating device with
a contact opening of at least 3mm (e.g. fuses or
mains switches).
> Also check the electrical isolation of the boiler with a
measuring instrument.
> Close the gas isolator cock.
> Close the stop valves in the heating flow and return.
> Remove the front casing of the boiler.
> When removing components which carry water, ensure
that no water comes into contact with electrical compo-
nents.
After completing any inspection and maintenance work,
perform the following steps:
> Only use new seals and O-rings when replacing parts.
> Open the stop valves in the heating flow and return.
> Open the cold water stop valve if necessary.
> Reconnect the boiler to the power mains.
> Switch on the boiler using the on/off switch.
> Fill the heating circuit of the boiler with water up to a
pressure of 0.1 and 0.2MPa (1.0 and 2.0 bar), if neces-
sary.
> If you have topped up the heating water, purge the heat-
ing installation (¬section 9.3.2).
> Open the gas isolator cock.
> Check the boiler for gas and water leaks.
> If necessary, refill and purge the heating installation
again.
> Reattach the front casing of the boiler (¬section 4.6).
> Carry out a functional check of the boiler
(¬section11.5.1 to 11.5.3).
> Always check the earth connection, the polarity and the
resistance with a multimeter following completion of the
maintenance or repair work and after replacing electrical
components.
> Complete the commissioning checklist that is attached to
these instructions.
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