Safety Instructions; Maintenance - Vaillant ecoTEC PLUS SERIES Installation And Maintenance Manual

7.1.2 Safety instructions

Important:
Before starting any maintenance work:
• Isolate the mains electricity supply by disconnecting
the plug at the socket outlet (if there is only an isolat-
ing switch remove the fuse from the switch).
• Turn OFF the gas supply at the gas service valve fitted
to the boiler.
• When removing any water carrying components
ensure that water is kept away from all electrical com-
ponents.
• Always use new seals and O–rings when parts are
replaced.
• Always test for gas soundness and always carry out
functional checks after any service work and after
replacing any gas carrying component.
• Always check earth continuity, polarity and resistance
to earth with a multimeter after any service work and
after replacing any electrical component.
Danger!
Electrocution by touching live parts can be
fatal!
The supply terminals in the appliance switch
box are under voltage even if the main switch is
off.
Protect the switch box from spray water.
Before working on the appliance, turn off the
power supply and secure against restart!
Always perform the following steps after completing any
inspection tasks:
• Open the maintenance taps in the heating supply and
return and in the cold water inlet (only 800 series).
• If necessary, refill the device with hot water up to a
pressure of approx 1.5 bar and evacuate the heating
system.
• Open the maintenance tap in the gas supply pipe.
• Turn on the power supply and the main switch.
• Check the appliance for gas and water leaks.
• Fill and evacuate the heating system again, if neces-
sary.
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.
Installation and maintenance manual ecoTEC
Inspection and maintenance 7
Note
The boiler is fitted with a combustion analysis
test point. A suitable combustion analyser can
be connected to this point to establish the com-
bustion performance of the boiler. It is not nec-
essary to check the CO
air ratio of the boiler during the annual service.
Checking/adjustment of this value is only
required in the following instances; replacement
of gas valve, conversion to or from Natural Gas/
LPG or if incorrect combustion is suspected
(see Section 9.7).

7.1.3 Maintenance

Before commencing any servicing or maintenance work,
carry out an initial inspection of the system as follows:
• Inspect the flue, pipework and electrical connections
for indications of damage or deterioration.
• Inspect the air supply and ventilation arrangements of
the installation.
• Check the heating and water system, in particular the
condition of radiator valves, evidence of leakage from
the heating system and dripping hot water taps.
content or adjust the
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