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Installation manual Duet M,L Smart
Total Horizontal Length (THL):
THL is the Total Horizontal Length and
consists of elbows and pipes entirely in
the horizontal plane. See elbows I, K and Q
and the elements H, J, L, M, P and R
(fig. 12.1 and 12.2).
Horizontal length:
The Horizontal Length consists of the
elements H, J, L, M, P and R
(fig. 12.1 and 12.2).
Elbows 90° in the horizontal plane:
Horizontal elbows are elbows entirely in
the horizontal plane (fig. 12.1, 12.2 and
12.3 I, K and Q).
Elbows 45° or 30° in the horizontal plane.
Horizontal elbows are elbows entirely in
the horizontal plane.
Elbows 90° vertical to horizontal:
These are 90° elbows, which proceed from
horizontal to vertical (fig. 12.2 and 12.3 G,
O and S).
14 <
<
<
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Elbows 45° or 30° vertical to horizontal
plane:
These are 30° or 45° elbows vertically
offset less than 45° (fig. 12.1 B and D).
Pipes at an angle of inclination:
These are pipes vertically ascending at an
angle of 30° or 45° (fig. 12.1 C). Fill in only
in combination with at least two 30° or
45° elbows in the vertical part.
Restrictor table:
See restrictor table for the correct vertical
(TVH) and horizontal length (THL).
In case of an "X" or if the values are outside the
restrictor table, the combination is not permitted.
Then adjust TVH or THL.
If a value is indicated, check that the calculated STL
value is not lower than indicated in the restrictor
table. In this case STL must be adjusted.
The value found indicates the width of the flue
restrictor to be placed ("0" means no flue
restrictor). Generally a 30mm flue restrictor is
installed (fig. 1.8).
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