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8 Inspection and maintenance
8
Inspection and maintenance
8.1
Inspection and maintenance intervals
Regular maintenance and service is recommended to
ensure permanent safe and efficient operation of the
boiler. The frequency of maintenance and service de-
pends upon the individual installation conditions and
upon the use the appliance is put to. An inspection must
be performed once a year.
d
Danger!
It is a legal requirement that all maintenance
work be only performed by trained personnel
(CORGI registered). Inspection and mainte-
nance work which is improperly carried out can
lead to injury and material damage.
In order to ensure all the functions of the Vaillant appli-
ance over a long period, only genuine Vaillant spare
parts may be used when undertaking maintenance, serv-
ice and repair work. Any spare parts which might be re-
quired are contained in the current Vaillant spare parts
catalogues. Further information can be obtained from
Vaillant Customer Service Centres.
8.2
General inspection and maintenance instructions
Only genuine Vaillant spare parts may be used for in-
spections, maintenance and repair work to ensure the
perfect long-term working order of all functions of your
Vaillant appliance and to prevent the allowed series con-
dition from being changed.
Any spare parts which might be required are listed in
the relevant current spare parts catalogues. Information
can be obtained from Vaillant Service Solutions
(08706060777).
Safety instructions
h
Note!
If it is necessary to keep the main switch on for
certain inspection and maintenance, this is indi-
cated in the description of the maintenance task.
d
Danger!
The supply terminals of the device are under
voltage even if the mains switch is off.
Always perform the following steps prior to maintenance
work:
• Switch off the mains switch.
• Disconnect the device from the mains supply by
pulling the power plug or de-energising the device by
means of a separator with a contact opening of at
least 3 mm (e. g. fuses or circuit breakers).
• Close the gas shut-off valve.
• Close the maintenance cocks (if fitted) in the heating
flow and return and the cold water inlet valve on the
inlet combination.
• Remove the front cover from the device.
30
Always perform the following steps after performing
any maintenance work:
• Open the heating flow and return and the cold water
inlet valve.
• Refill the device, if necessary, with hot water up to
a pressure of between 1.0 and 2.0 bar and vent the
heating system.
• Open the gas shut-off cock.
• Re-connect the appliance to the electrical mains by
inserting the plug into the wall plug socket and switch
the main switch on.
• Check the appliance for gas and water leaks.
• If necessary, refill and re-vent the heating system.
• Reapply the front cover to the device.
• Check all the functions of the appliance.
8.3
Filling/draining the heating installation
8.3.1
Filling the unit and heating installation
The filling of the appliance and the heating system is de-
scribed in Section 6.1.
8.3.2 Draining the unit
• Close the maintenance cocks (if fitted) on the appliance.
• Open the drain valves on the maintenance cocks.
8.3.3 Draining the entire installation
• Attach a hose to the filling/draining cock on the system.
• Bring the open end of the hose to an appropriate
drain point.
• Check that the maintenance cocks of the boiler are
open.
• Open the filling/drain cock.
• Open the bleed valves on the radiators.
Start at the highest radiator and then work from the
top to the bottom.
• When the water has drained out of the heating sys-
tem, close the bleeding valves on the radiators and
close the filling/drain cock again.
8.4
Servicing the compact thermal module
8.4.1
Dismantle compact thermal module
The compact thermal module consists of a speed-con-
trolled fan, the gas fitting, the gas mixer pipe for the fan
pre-mix burner and the pre-mix burner itself. These four
individual parts form the compact thermal module com-
ponent.
d
Danger!
Danger of explosion through gas leakage!
The mixer tube between the gas control unit
and burner must not be opened. It can only be
guaranteed that this component is gas-tight
after it has been inspected at the factory.
d
Danger!
There is danger of being burned or scalded at
the compact thermal module and at all compo-
nents carrying water. Only carry out work on
these components once they have cooled down.
ecoTEC exclusive installation and maintenance instructions / 0020017768_02
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