Safety Instructions; Checking The Co Concentration; Required; Danger - Vaillant ecoTEC VU 466/4 Installation And Maintenance Instructions Manual

- The gas inlet working pressure at maximum rate as
described in section 6.3.3.
- The gas flow rates as described in section 6.3.2.
- Correctness of electrical, water and gas connections.
- Correctness of the water pressure.
- The condition of the whole system, in particular the
condition of radiator valves, evidence of leakage from
the heating system and dripping taps.
• Correct any faults before proceeding.
8.1.2

Safety instructions

Danger!

Danger of life and limb by electric shock!
The supply terminals of the boiler are under
mains voltage even if the boiler main switch is
off.
• Don't touch the supply terminals.
• Protect the electronic box from any water or
spray.
• Before working on the boiler, turn off the
power and secure against restart.
Note
If it is necessary to keep the electricity to the
boiler switched on for certain inspection and
maintenance, this is indicated in the description
of the maintenance task.
Always perform the following steps prior to inspection
or maintenance work:
• Switch off the main switch.
• Disconnect the boiler from the power mains by
- disconnecting the mains plug or
- de-energising the boiler via an isolating device with a
contact opening of at least 3 mm (e. g. fuses or
power switches).
• Further check for electrical isolation of the appliance
by use of a test meter.
• Close the gas isolation valve.
• Close the service valves in the heating flow and
return.
• Remove the front casing from the boiler.
• When removing any water carrying components
ensure that water is kept away from all electrical
components.
Always perform the following steps after performing
any inspection or maintenance work:
• Always use new seals and O-rings when parts are
replaced.
• Open the service valves in the heating flow and
return.
• Reconnect the boiler to the power mains.
• Switch the main switch on.
• Fill the heating circuit of the boiler to a pressure of
between 1.0 and 2.0 bar if required.
Installation and maintenance instructions ecoTEC 0020029172_03
Inspection and maintenance 8
• Bleeding the heating installation (see section 6.2,
Filling the system).
• Open the gas isolation valve.
• Check the boiler for gas and water leaks.
• If necessary, refill and re-bleed the heating
installation.
• Replace the front casing to the boiler.
• Carry out a functional check of the boiler
(see section 6.4).
• Always check earth continuity, polarity and resistance
to earth with a multimeter after any service work and
after replacing any electrical component.
8.1.3 Checking the CO
Note
Checking/adjustment of the CO
is required in the following instances:
- replacement of gas valve,
- conversion to or from Natural Gas/LPG
- or if an incorrect combustion is suspected.
4
Fig. 8.1 Measuring the CO
2
ratio (gas setting)
Legend:
1 Flue gas analysis point
2 Screw
3 Air intake pipe
4 Main throttle
Note
The boiler is fitted with a flue gas analysis
point (1). A suitable flue gas analyser can be
connected to this point to establish the
combustion performance of the boiler.
concentration
2
concentration
2
concentration, specifying the air
1
2
3
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