43ecoTEC plus 937 installation and maintenance manual
7 Inspection and maintenance
7.1 First inspection
Regular maintenance and service is recommended to
ensure continued safe and efficient operation of the
appliance. The frequency of maintenance and service
depends 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 performed by competent personnel
(CORGI registered).
Inspection and maintenance work which is not
carried out by a competent person can result in
injury and property damage.
In order to ensure all the functions of the Vaillant
appliance over a long period, only genuine Vaillant spare
parts may be used when undertaking maintenance,
service and repair work. Any spare parts which might be
required are contained in the current Vaillant spare
parts catalogues. Further information can be obtained
from Vaillant Customer Service Centres.
7.1.1 Safety instructions
Important:
Observe the following instructions before starting the
maintenance work:
• Isolate the appliance from the electrical mains by
pulling the mains plug out of the socket. (If there is
only an isolator, the fuse must be removed from the
switch).
• Turn OFF the gas supply at the gas isolation valve on
the appliance.
• Take care when removing water-carrying components
that all electrical components are kept away from the
water.
• Always fit new seals and O-rings when replacing
components.
• Always carry out a gas tightness test and always carry
out a function check after completion of maintenance
work or after replacing gas-carrying components.
• After all maintenance work and after replacing
electrical components check the earth continuity,
polarity and earth resistance using a multi-meter.
e
Danger!
Electric shock by touching current-conducting
parts can be fatal!
The electrical mains supply terminals in the
electronics box remain live even when the main
switch ON/OFF is switched off.
Protect the electronics box from water
splashes.
Before working on the appliance, turn off the
power supply and secure against restart!
Always perform the following steps after performing any
maintenance work:
• Open the isolation valves in the heating flow and
return lines and the cold water isolation valve.
• If required, fill the unit with cold water up to a
pressure of approx. 1.5 bar and bleed the heating
system.
• Open the isolation valve of the gas supply pipe.
• Turn on the power supply and the main switch.
• Check the appliance for gas and water leaks.
• If necessary, refill and re-bleed the heating system.
h
Note!
If it is necessary to keep the main ON/OFF
switch on for certain inspection and
maintenance activities this is indicated in the
description of the maintenance task.
Note!
The appliance is fitted with a combustion
analysis test point. A suitable flue gas analyser
can be connected to determine the combustion
efficiency of the boiler. This check is required
during an annual service (alternative methods
are described if no flue gas analyser is
available). A combustion analyser must be used
for the following circumstances:
Replacing the gas valve, converting to or from
natural gas/LPG or if poor combustion is
suspected. (see section 9.7).
Inspection and maintenance 7
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