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5.3 Flue gas connection and flue
Due to the low flue gas temperatures, condensate forms within the flue. For this reason,
HOVAL gas heating boilers can not be connected to conventional house chimneys.
The flue gas extraction system must comply with the following directives:
DVGW (TRGI)
ÖVGW
SVGW/VKF
Pursuant to the abovementioned regulations, a flue gas temperature limiter must be in-
stalled in the boiler.
The flue gas system must meet the following requirements:
Gastight
Watertight
Acid-proof
Approved for flue gas temperatures of up to 120ºC (T 120)
Approved for overpressure
Unhindered backflow of condensate into the boiler can only be ensured if:
The gradient of the horizontal connection elements is at least 50 mm/m.
Cross sections and maximum lengths are calculated on the basis of graphs or tables.
The tables can be obtained from the chimney or flue system manufacturer.
The calculation values can be obtained from the table in chapter 4.2.
The flue gas conduit cross sections and lengths are calculated following the technical data
for the boiler.
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