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4. INSTALLATION
The Granola AUTOMATIC boiler is no different from a normal solid fuel boiler; therefore, there are no specific
installation instructions beyond the safety requirements of the relevant standards in force. The room must be
well ventilated; ventilation openings must have a minimum total surface area no less than 0.5 m
2
. To simplify
cleaning of the flue gas circuit, a free space no less than the length of the boiler should be left at the front,
making sure that the door can open 90° without being obstructed.
The boiler can rest directly on the floor, as it comes with a self-supporting frame. Nonetheless, in very damp
boiler rooms, a concrete base is recommended. Once installation is complete the boiler must be perfectly
horizontal and stable so as reduce any vibrations and noise.
4.1. Positioning in the boiler room
The boiler must be installed in the boiler room in compliance with the relevant legislation in force (for further
details contact your local fire station)
The distances for positioning the boiler in the boiler room are illustrated below.
4.2. Expansion vessels
In accordance with standards in force (in Italy), solid fuel boilers with manual loading must be installed in
systems fitted with “open” expansion vessels. For automatic loading, systems with closed vessels are
permitted.
4.3. Chimney
The chimney plays a fundamental role in ensuring good boiler operation: the chimney must be impermeable
and well insulated. Old or new chimneys not built in compliance with the above specifications can be used,
however with special modifications. A metal flue needs to be entered inside the existing chimney, filling the
space between the metal flue and the chimney with special insulation. Chimneys made from prefabricated
blocks must have perfectly sealed joints to prevent condensate in the flue gas from fouling the walls due to
absorption.
Construction of new chimneys must be based on an approved design, as required by the relevant standards
in force.
In any case, the chimney must feature good draught, equal to at least 2 mm WC of negative pressure at the
base when cold. Chimneys with insufficient draught will cause the boiler to shutdown when the system is not
operating, with tar and condensate forming along the air inlet. Vice-versa, a chimney with excessive natural
draught will cause problems of thermal inertia as well as high pellet consumption.
A draught register should always be installed so as to maintain constant negative pressure in the chimney.
This will avoid any unwanted increases in heat output.