If the boiler is installed in an unusual location, special procedures may be necessary and BS
5546 and BS 6798 give detailed guidance on this aspect. The boiler must be mounted on a flat,
vertical wall, which must be sufficiently robust to take the weight of the boiler. The boiler may be
installed on a combustible wall, subject to the requirements of the Local Authorities and Building
Regulations.
A compartment used to enclose the boiler must be designed and constructed specifically for this
purpose. (An existing cupboard or compartment may be used provided that it is modified for the
purpose). Details of essential features of cupboard/compartment design including airing
cupboard installations are given in BS 6798. If the boiler is to be fitted in a timber framed
building, it should be fitted in accordance with Institute of Gas Engineers Publication IG/UP/7
Edition 2 “Gas installations in timber framed and light steel framed buildings“. Please note the
safety instructions below before deciding where to install the boiler:
CAUTION:
Do not !install the appliance in rooms prone to frost. In rooms with aggressive steam or
dust, the appliance must be operated independent of the ambient air.
When choosing the place of installation and while operating the appliance, make sure that the
air supply is free of chemical substances containing fluorine, chlorine, sulphur etc. Sprays,
solvents and cleaning agents, paints, adhesives etc. contain the kind of substances that can
lead to corrosion even in the exhaust system when the appliance is operated depending on the
ambient air in the worst case scenario. Particularly in hair-cutting salons, lacquering and
finishing, cleaning facilities, the appliance must be operated independent of the ambient air!
Otherwise, a separate installation room is required to guarantee that the air supply is free of the
above mentioned substances.
3.4 Gas supply
The gas supplier should ensure the availability of an adequate supply of gas. A gas meter may
only be connected to the service pipe by the supplier of gas or their contractor. An existing
meter should be checked to ensure that it is capable of passing the rate of gas supply required.
Installation pipes should be fitted in accordance with BS 6891. In IE the current edition of IS
813. Pipe work from the meter to the boiler must be of an adequate size. Do not use pipes of a
smaller size than the boiler gas connection (15 mm). The complete installation must be checked
for leaks and purged as described in BS 6891.
WARNING:
Vaillant appliances are certified only for use with genuine Vaillant flue pipes. Only use
genuine Vaillant flue pipes. Malfunctions can occur if you use other accessories.
These may result in damage and injury.
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