Safety distance from flammable materials
− When installing and operating the boiler, it is necessary to observe the safety distance of 200 mm from flammable
materials with B, 1 and 2 combustibility grades (according to ČSN 06 1008).
− Regarding easily flammable materials with 3 combustibility grade that burn quickly and alone even after the
ignition source has been removed (e.g. paper pasteboard, cardboard, asphalt and tar pasteboards, wood and wood-
fibre boards, plastics, flooring materials), the safety distance must be doubled to 400 mm.
− The safety distance must be also doubled if the building material combustibility grade has not been proven.
The boiler location with regards to the necessary handling space:
− Basic environment AA5/AB5 according to ČSN 33 2000-3.
− Minimum handling space of 1000 mm should be reserved in front of the boiler.
− Minimum distance between the rear boiler part and wall makes 600 mm.
− Minimum space of 400 mm for accessing the rear boiler part must be reserved from one side at least.
Combustibility grades of building materials and products
ombustibility grades of
building materials and
products
Building materials and products classified according to their combustibility grade
(selection from ČSN EN 13 501-1)
A – nonflammable
B – hardly flammable
C1 – heavily flammable
C2 – moderately
flammable
C3 – easily flammable
granite, sandstone, concrete, bricks, ceramic tiles, mortars, fire-stopping plasters,…
akumin, izumin, heraklit, lignos, basalt plates and felts, fibre-glass boards,…
beech wood, oak wood, hobrex plates, plywoods, werzalit, formica, sirkolit,…
pine wood, larch wood, spruce wood, chipboard and cork slabs, rubber flooring
materials,...
asphalt pasteboards, pressed fibre-boards, cellulose materials, polyurethan, styrofoam,
polyethylene, PV ,…
Fuel location:
− It is strictly forbidden to place the fuel behind the boiler or store it next to the boiler within a distance smaller than
800 mm.
− It is strictly forbidden to place the fuel between two boilers in the boiler-room.
− The producer recommends to keep the minimum distance of 1000 mm between the boiler and fuel or place the fuel
into a room being separated from the room where the boiler has been installed.
5. 3 Installation into the heating system
The rotecting equi ment against overheating is not necessary in the event of using an o en ex ansion reservoir.
Any heat source within the open ther al syste ust be connected to the open expansion reservoir being located in
the highest ther al syste point. The expansion reservoirs ust be di ensioned so that they are able to take hold
of water volu e changes incurred by heating and cooling processes. These open expansion reservoirs have to be
equipped with non-shuttable aeration and overflow pipelines. The overflow pipeline should be designed in order to
drain off safely the highest flow quantity entering the syste . This can be reached through di ensioning the
overflow pipeline by one DN higher than the filling pipeline. The expansion reservoirs and respective connection
pipelines ust be designed and positioned so that their freezing is reliably prevented.
