Vaillant ecoMAX 646 Installation And Maintenance Manual - page 26
Installation and maintenance manual ecoMAX 646 / 0020020158_02
26
7 Inspection
and
maintenance
7.1 Initial
inspection
To ensure the continued safe and efficient operation of
the boiler it is recommended that it is checked and serv-
iced as necessary at regular intervals. The frequency of
servicing will depend upon the particular installation
conditions and usage. An inspection must be carried out
once a year.
Danger!
It is law that all servicing work is carried out
by a competent person (CORGI registered).
Inspections/Maintenance work not carried out
by a competent person can result in damage to
property and personal injury.
Only genuine Vaillant spare parts may be used for in-
spections, maintenance and repair work to ensure the
long-term working order of all functions of your Vaillant
appliance.
Any spare parts which might be required are contained
in the current spare parts catalogues. Information can
be obtained from Vaillant Customer Service Centres.
7.1.1 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 en-
sure that water is kept away from all electrical compo-
nents.
• Always use new seals and O–rings when parts are re-
placed.
• Always test for gas soundness and always carry out
functional checks after any service work and after re-
placing 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 live even if the main ON/OFF switch is
turned 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 service valves in the heating flow and return
and in the cold water inlet (combination boilers only).
• If necessary, refill the device with cold water up to a
pressure of approx 1.5 bar and bleed air from the en-
tire heating system.
• Open the service valve of the gas supply pipe.
• Turn on the power supply and the main switch.
• Check the appliance for gas and water leaks.
• Fill and bleed air from the heating system again, if
necessary.
Note
If it is necessary to keep the main switch on for
certain inspection and maintenance, this is in-
dicated in the description of the maintenance
task.
Note
The boiler is fitted with a combustion analysis
test point. A suitable combustion analyser can
be connected to this point to establish the
combustion performance of the boiler. Check-
ing/adjustment of this value is required in the
following instances; replacement of gas valve,
conversion to or from Natural Gas/ LPG or if
incorrect combustion is suspected (see section
5.2.3).
7.1.2 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.
7 Inspection and maintenance