Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions - page 39
39
Installation and maintenance instructions ecoTEC plus 0020031552_03
7 Inspection
and
maintenance
7.1 First
inspection
Regular maintenance and service is recommended to
ensure continued safe and efficient operation of the ap-
pliance. 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 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 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.
7.1.1 Safety
instructions
Important:
Observe the following instructions before starting the
maintenance work:
• Isolate the appliance from the electrical mains by pull-
ing 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 isolator 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 com-
ponents.
• 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 electri-
cal 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 stop valves in the heating flow and return
lines and the cold water stop valve.
• If required, fill the unit with cold water up to a pres-
sure of approx. 1.5 bar and bleed the heating system.
• Open the stop 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 mainte-
nance activities this is indicated in the descrip-
tion of the maintenance task.
Note
The appliance is fitted with a combustion anal-
ysis test point. A suitable flue gas analyser can
be connected to determine the combustion effi-
ciency of the boiler. This check is required dur-
ing an annual service (alternative methods are
described if no flue gas analyser is available). A
combustion analyser must be used for the fol-
lowing circumstances:
Replacing the gas valve, converting to or from
natural gas/LPG or if poor combustion is sus-
pected. (see section 9.7).
7.1.2 Maintenance
Carry out a first inspection of the system before start-
ing maintenance or repair work as follows:
• Check the flue system, the pipework and the electrical
connections for signs of damage or wear.
• Check the air supply and ventilation of the installation.
• Check the heating and water system, especially the
condition of the radiator valves, evidence of leaks in
the heating system and dripping hot water taps.
Inspection and maintenance 7