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settling down on the boiler’s convection channels. If the draught is too strong, it will
cause excessive air to draw into the retort from the outside, enlarging heat losses and
will be also affecting the dust quantity to be blowout the cinders. A smoke conduit is
provided with sprocket, which in case that chimney draught is to strong, enables its
throttling.
Selection of the chimney’s height and section comparing to boiler power should be
based on detailed regulations being in force in the country of destination.
Assuming that is not possible to achieve such parameters for chimney, and chimney
draught problems and 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 possibly appearing in the chimney, its height should be
above a crest of roof not less than 1.5. 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!
For boiler to be used, it is not required to apply flue insert, however in year
round exploitation – it is recommended to provide heating to the hot utility
water container.
6.4. CONNECTING BOILER TO 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.
Boilers of SAS GRO-ECO type may work with gravitational or forced water
circulation. If installation is provided with circulation pump, than on feeding/return pipe
the differential valve should be installed. When blackout or pump malfunction occurs,
this valve will open and the system start work running by gravitation.
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.
If not satisfactory to comply with manufacturer’s recommendations in reference to
maintaining given heating water temperature ranges occurs (table TECHNICAL –
EXPLOITATION PARAMETERS p. 13-14, point 13, it concerns in particular
long-lasting return water temperature below 55°C), then the boiler should
