Vaillant ecoTEC plus 612 Instructions For Installation And Servicing page 89

FITTING AIR/FLUE DUCT EXTENSIONS
• When using elbows for long flue
runs in a corner follow fig. 6.4
and fig. 6.5 to avoid obtrsuctions.
Note: The elbows must be
correctly aligned to avoid undue
stress on the joints an risk of
leakage.
The elbow fitted to the top of the
90
boiler (1) should be twisted by 3°
to ensure that the second 87° el-
bow (2) exits the wall perpendi-
cular.
When using 87° elbow install with
a slope of 3° between wall and
air-flue pipe (fig. 6.4) or use 2 x
45° elbows (fig. 6.5).
*
2
1
* = 3
max. 5 m
Fig. 6.4: Long flue runs – using 87° elbow
90
1
max. 5 m
Fig. 6.5: Long flue elbow – Using 45° elbows
33
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