9
Assuming that it is not possible to achieve such parameters for chimney, and
chimney draught problems are experienced, resulting in improper boiler
performance, the gases blow-out fan, or chimney base together with built-in fan
may be applied, for supporting and stabilizing the draught. It is important for the
chimney to has its beginning at the level of boiler room floor, for the reason that
gases leaving the boiler are able to be repelled. It is also important, that in the
bottom part of chimney there is washout whole with tight closing.
In order to avoid the air back draught possibly appearing in the chimney, its height
should be above a crest of roof not less than 1.5 m. Chimney’s utility
(permeability) should be checked and confirmed by authorized chimney-sweeper
at least once a year.
PRIOR TO BOILER COMMISSIONING THE CHIMNEY SHOULD BE BASKED!
NOTE: It is recommended that the flue is made of stainless steel material. If
boiler is kept with low temperatures for longer time, such a flue is mandatory.
Low temperatures in the boiler cause wet gases emission. This may be found as the
reason of wetting and corroding of brick chimneys.
6.4 CONNECTING BOILER TO THE HEATING INSTALLATION
The boiler should be connected to heat in installation with screw connectors.
Protecting measures for water heating installations of opened type should be
according to detailed regulations being in force in the country of destination (e.g.PN-
91/B-02413).
Volume of pressure vessel should be equal at least 4% volume o water in the entire
heating installation.
NOTE: Ascending and descending safety pipe as well as circulation pipe must
not be equipped with any valves. In addition, those pipes and the pressure
vessel should be protected against freezing.
If not satisfactory to comply with manufacturer’s recommendations in reference to
maintaining given heating water temperature ranges occurs (table TECHNICAL –
EXPLOITATION PARAMETERS p. 12, point 12, 13, it concerns in particular long-
lasting return water temperature below 55°C), t hen the boiler should be connected
to the heating installation equipped with three- or four-pass valve protecting it
against low temperature corrosion.
NOTE: It is recommended to connect the boiler to heating system provided
with three- or four-pass valve. The main advantage of such connection is boiler
protection function against low temperature corrosion, preventing it from
premature wear.
