eta PelletsCompact PC33, Installation Manual

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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 directional
changes. The flue pipe to the chimney must be
leakproof. Use heat-resistant silicone as a sealant for
unsealed sleeve pipes. Otherwise, you can expect
smoke to escape into the boiler room as the boiler
heats up. The flue pipe must always be laid so that it
ascends towards the chimney.
Long horizontal flue pipes to the chimney must have a
narrow cross-section and above-average insulation (>
50 mm). Provide enough cleaning openings in the flue
pipe. A flue pipe to the chimney with a large cross
section would reduce the calculated required chimney
cross section. However, ash deposits will form at low
flow speeds, and the theoretically calculated flue
draught will be lost again.
With a large chimney cross-section, a maximum
straight length of the flue pipe up to half the effective
chimney height is possible (calculation required).
Connection to the sewage system for the chimney
For the condensate in the chimney, a connection to the
sewage system (e.g. duct) with at least DN25 via a
siphon is required. The sewer pipe to which the con-
densation drain pipe is connected should be flushed
once a year.
Fig. 7-1: Condensate drain
For chimneys on the outer walls (made of
stainless steel, for example), frost-proof run-off
must be provided for the condensate water.
Insulate flue pipe to chimney
The flue pipe from the boiler to the chimney should be
insulated with at least 30 mm, preferably 50 mm, of
mineral wool to avoid temperature losses, which can
lead to a build-up of condensation.
Prevention of structure-borne noise
There should not be a fixed connection between the
flue pipe and the chimney to prevent structure-borne
noise as much as possible! Good flue gas systems are
acoustically insulated. If steel pipes are connected to a
fireclay chimney, ceramic fibre bandages have proven
effective at preventing structure-borne noise as well as
damage to the fireclay sleeve.
Cleaning opening in flue pipe
Easily accessible cleaning openings must be available
for cleaning the flue pipe.
Fig. 7-2: Cleaning opening
Fit the chimney connection just under the ceiling
Even if the current boiler can be connected to the
chimney at a low height, it is better if you fit the
chimney connection just below the ceiling. The flue
pipe is easier to install, and the vertical connecting pipe
is long enough for an emission measurement.
A second chimney connection below the first one
enables simple installation of a draught limiter, if
this is required.