Slant/Fin VSL-160C Part B - Manual (Page 7)

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10 - INSTALLATION - Vent and combustion air
10.9.3 - Polypropylene
concentric system
The boiler is not supplied with the
fi ttings needed for connecting a
coaxial vent/combustion air system.
A special kit must be ordered to
connect the boiler with the Coaxial
polypropylene vent. Figure 10-14
shows how to install the Coaxial fi tting
above the boiler. Tight the screws “D”
of Figure 10-14 with a tork of 2 lbf ft
(3 Nm)
WARNING!!!
Carefully
follow installation steps below,
for the coaxial pipe assembly
(elbows and extensions), as
illustrated in Figure 10-15. It is
necessary to properly insert
the internal and external pipe
and mechanically secure them
by using a stainless steel
self tapping screw. Improper
venting can result in excessive
levels of carbon monoxide or a
fi re, which can result in severe
personal injury or death!
In particular:
1. slip-fi t the extension “1” and “2”
(see Figure 10-15) together;
2. drill a suitable hole “3” with a drill
“4” (see Figure 10-15) in a position
where the two pipes “1” and “2” are
overlapped;
3. insert a suitable stainless steel self
tapping screw “5” and tight it with a
screwdriver “6”

It is recommended that wall sleeve
be used when installing the coaxial
system through an exterior wall.
This will allow the system to be
easily slipped out for access during
routine maintenance.

Horizontal coaxial systems must
always be pitched by at least 1/4 in/
ft, (21 mm/m) towards the boiler.
Figure 10-14 Installation of the coaxial fi tting
Figure 10-15 Securing extensions and elbows together
B = Connection fl ange
C = Fasten clip
D = Fasten clip screw
F = Coaxial vertical adaptor