Hoval BioLyt 100, Technical Information Installation Instructions

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6.2 Flue connection and dimensioning
6.2.1 General information
To guarantee economical and fault-free operation, boiler
and chimney must be mutually adapted to create a func-
tional unit.
A moisture-resistant flue is required for the correct ope -
ration of the Hoval BioLyt. Watertight and acid-proof flue
gas systems should be used in new installations.
Existing flue gas systems may require refurbishment or
alteration of the flue duct cross-section as indicated by
a chimney engineer. The flue draught depends, among
other things, on the following factors:
a) type (materials and characteristics) of the flue duct
(thermal insulation, internal surface roughness, le-
ak-tightness, etc.).
b) the connection of the boiler to the chimney according
to specification.
c) correctly dimensioned effective cross-section of the
flue gas duct.
ref. a)
The flue duct must be moisture- and soot-fire-resistant (a
chimney engineer must be consulted).
ref. b)
The flue gas pipe connecting the boiler to the flue gas
system must be as short as possible and placed at an
angle of 30-45° if possible.
The entry location of the flue gas pipe must be carefully
sealed. The insertion of the flue gas pipe into the flue gas
system must be carried out in such a way that no conden-
sation water can flow from the flue gas system into the
flue gas pipe and into the boiler.
The local regulations may prohibit the connection of more
than one heat generator to the same flue gas system (see
also chapter 6.2.2).
• Where possible, avoid 90° bends in the flue gas sys -
tem!
• Flue gas pipes longer than 1 m are to be insulated.
!
WARNING
• A combined draught-explosion damper
must be installed between boiler and flue.
• It must be positioned in such a way that
no-one will be injured in the event of de-
flagration.
• The combination draught-explosion dam-
per must be positioned within the boiler
room.
NOTICE
The diameter of the flue gas pipe connecting
the boiler to the flue gas system must not be
smaller than that of the flue gas outlet on the
boiler. Connect the flue gas pipe to the flue
gas system elastically.
ref. c)
Dimensioning of the flue duct cross-section:
The cross-sections are calculated on the basis of boilers
with a supply pressure of at least 0.05 mbar, in accor-
dance with EN 13384-1. Take into consideration locati-
on-specific factors (hillside location of the building, chim -
ney position, roof inclination, chimney stack exit shape,
etc.)!
It is advisable in every case to consult the chimney en-
gineer in the planning stages!
The flue draught must be in the range of 0.05 - 0.25 mbar
(0.5 - 2.5 mmWC or 5 - 25 Pascal).
6.2.2 Connecting 2 hoval BioLyt (50-160) to a
common chimney
In principle, the separate connection of 2 independent
chimneys is always the better solution.
If this is not possible, the following criteria must be fulfilled
when connecting 2 Hoval pellet boilers of the series
BioLyt (50-160) to a common chimney:
• A chimney calculation must exist, which evaluates all
relevant conditions as having been met (above all, mi-
nimum draught required); to be observed is (among
other things) the greatly increased modulation area of
a 2-boiler system.
• A separate connection pipe must be run to the chim-
ney from both pellet boilers; both flue gas pipes may
first meet in the vertical chimney (intersection each with
45°); a junction before entry in the chimney per hose
piece or similar is not permitted.
• Every connection pipe must be equipped with its own
combination door – damper protection/explosion pro-
tection; distance from the flue gas outlet of the boiler
must amount to at least 2x D.
• Installation of flue gas dampers is not permitted.
• When commissioning the boiler, the correct function of
the flue gas system must be checked and confirmed by
Hoval factory customer service.
• The approval of the responsible regional chimney
sweep must be present.
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InSTALLATIOn