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LCombined length of the flue and air supply channel
Flue gas outlet connection
Air supply connection
Tab.17 Maximum length (L)
Diameter (1) 300 mm 350 mm 400 mm
Gas 620 Ace 570 100 m(1) 100 m(1) 100 m(1)
Gas 620 Ace 710 48 m 100 m(1) 100 m(1)
Gas 620 Ace 860 24 m 83 m 100 m(1)
Gas 620 Ace 1000 - 38 m 90 m
Gas 620 Ace 1150 - - 28 m
Gas 620 Ace 1300 - - -
(1) While maintaining maximum length, additional 5 times 90º or 10 times 45º
bends can be used (indicated for each boiler type and diameter).
Reduction table
Tab.18 Pipe reduction for each bend - radius 1D (parallel)
Diameter 250 mm 300 mm 350 mm 400 mm
45° bend 2.0 m 2.4 m 2.8 m 3.2 m
90° bend 3.5 m 4.2 m 4.9 m 5.6 m
4.5.5 Additional guidelines
Air supply filter
An air supply filter is separately available.
When installing the boiler in a room-ventilated setup (B23, B23P):
It is recommended to install the air supply filter if the boiler is installed in
a dusty room.
It is mandatory to install the air supply filter if the boiler is exposed to
construction dust.
Installation
For installing the flue gas outlet and air supply materials, refer to the
instructions of the manufacturer of the relevant material. After
installation, check at least all flue gas outlet and air supply parts for
tightness.
Warning
If the flue gas outlet and air supply materials are not installed in
accordance with the instructions (e.g. not leak-proof, not correctly
bracketed), this can result in dangerous situations and/or physical
injury.
Make sure that the flue gas outlet pipe towards the boiler has a sufficient
gradient (at least 50 mm per metre) and that there is a sufficient
condensate collector and discharge (at least 1 m before the outlet of the
boiler). The bends used must be larger than 90° to guarantee the
gradient and a good seal on the lip rings.
Condensation
Direct connection of the flue gas outlet to structural ducts is not
permitted because of condensation.
If condensate from a plastic or stainless steel pipe section can flow back
to an aluminium part in the flue gas outlet, this condensate must be
discharged via a collector before it reaches the aluminium.
Newly installed aluminium flue gas pipes with longer lengths can
produce relatively larger quantities of corrosion products. Check and
clean the siphon more often in this case.
Fig.17 Different pressure zones Gas 620
Ace
AD-3001566-01
L = +
Fig.18 Bend radius 1D
AD-3001609-01
D
R=1D
4 Before installation
20 7734324 - v.06 - 01102021
20


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