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Chimney
Information for installation
pipe. The optimum to strive for is the shortest pipe from
the boiler to the chimney with a minimum of direction
changes.
The flue pipe to the chimney must be leakproof. For
unsealed sleeve pipes, use heat-resistant silicone as a
sealant. Otherwise, you can expect smoke to escape
into the boiler room as the boiler heats up. Ensure the
flue pipe always ascends to the chimney
Long horizontal flue pipes to the chimney must have a
narrow diameter and above-average insulation (>50
mm). Provide enough cleaning apertures in the flue
pipe. A flue pipe to the chimney with a large diameter
would reduce the necessary calculated chimney
diameter. However, with low flow speeds ash deposits
will form, and the theoretically calculated flue draught
will be lost again.
If the chimney has a large diameter, the straight length
of the connecting pipe can be at maximum half of the
effective chimney height (calculation required).
A draught limiter is required for boilers with flue
gas recirculation
If the boiler is equipped with flue gas recirculation,
such as the PE-K pellet boiler (or eHack wood chip
boilers with optional flue gas recirculation), a draught
limiter must always be installed in the chimney.
Fig. 7-1: Draught limiter
Flue gas recirculation conveys a portion of the
flue gas back to the boiler to cool the combustion
chamber. An overly strong flue draught prevents the
recirculation to the boiler and the flue gas reaches the
chimney immediately, thus rendering the flue gas recir-
culation ineffective. This leads to slag formation and
increased wear on the boiler.
Fig. 7-2: optimum placement of the draught limiter
At a minimum, the draught limiter must correspond to
the diameter of the chimney and should optimally be
connected 0.5 m below the flue tube connector in the
chimney. If that is not possible, installation in the
connection pipe to the chimney is required. Example:
Chimney: dia. 220 mm
Connection pipe to chimney: dia. 180 mm
=> a draught limiter of at least 220 mm diameter is
required.
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