Fire Requirements; Requirements For The Chimney Flue - Stropuva S7 Installation And Maintenance Manual

be fitted in. (Rectangular inserts are not reliable due to cracks formed in connection places due to
temperature changes).
The boiler is erected straight on concrete floor; any cracks between the floor and the boiler are
sealed with heat resistant silicone or lime-cement solution with sand or other materials. The boiler can
be erected on a concrete bottom intended for fitting with an insulation rope.
During carrying sometimes parts of the boiler get deformed therefore when it is fitted into the
chimney flue and after closing all the doors and also the opening of the chimney flue cleanout opening,
check the operation of the upper valve, its nestling against surface of the air intake opening and doors
insulation using the flame of a candle or match.
The boiler is erected on a non flammable base. Metal connection of the boiler near the chimney
must be produced from metal not thinner than 1,5 mm and coated with heat insulation materials. The
condition of the chimney flue must be checked once per month (by examining it during the day time
through the cleanup opening with a mirror), in the event of necessity – clean it since soot and tars build
up in the chimney flue can ignite, throw the sparks, cause fire hazard, overheat or damage the insert.
Using branded chimney flues (of stainless steel or ceramic), study the users' manual and fulfill the
requirements, cleaning periodicity in particular. When the chimney flue is cleaned up, a horizontal flue
between the boiler and chimney flue must be cleaned up either.

5.2. REQUIREMENTS FOR THE CHIMNEY FLUE

The cross-width of the chimney flue opening can be 10 percent less as it is specified in the main
technical requirements but not bigger. The boiler requires an individual chimney flue; any other
devices cannot be connected to it. So that the formed condensate in the chimney flue would not get into
the boiler, a flue from the boiler to the chimney flue must be horizontal and not longer than 1.5 m and
not shorter than 0.20 m, well sealed and insulated with a heat insulation material in the connection
places. Flue and chimney flue is periodically cleaned up considering the mentioned above fire
requirements.
It is recommended:
• to fit in the chimney the insert of stainless steel; an orderly and correctly fitted insert
protects the chimney against the effect of condensate or moister;
• an insert must not minimize significantly the cross section of the chimney opening; parts of
the insert must be tightly interconnected (with stainless steel rivets);
• ash collector must be mounted below, collector must be mounted 15-20 cm below the flue
connection to the chimney flue; then the flue can be easily cleaned up through it;
• the gap of the chimney between an insert and chimney walls, at least outside the chimney,
fill with inflammable insulation materials. At the top a crack must be hermetically plastered and
tin coated with a slope (from the opening to the chimney side);
• the chimney at the cold loft must be sealed with inflammable insulation materials.

5.1. FIRE REQUIREMENTS

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