INSTALLATION AND OPERATION INSTRUCTIONS
1-8
VFC 15-150 - VFC 45-225 MODULATING GAS BOILERS
Figure 3: Rooftop vent terminal configurations
1.4.6 Sidewall Vent Termination
sidewall direct vent applications shall be vented as follows:
•
Both the inlet and exhaust terminations should normally be located on the
same plane (side) of the building.
•
the exhaust outlet is to be placed so as to reach 24" minimum above the
down-turned intake - to avoid exhaust re-ingestion.
•
the elevation of both pipes can be raised in “periscope style” after passing
through the wall, then configured as in
Figure 4
, to gain required clearance.
1.4.5 Rooftop Vent Termination
rooftop vents must terminate as follows:
•
the exhaust pipe can terminate in an open vertical orientation without
concern about rain infiltration; this will drain away through a properly
configured condensate trap.
•
if used, the intake air pipe is not typically drained, so it must be terminated with
a down-turned elbow (see
Figure 3
). the intake pipe does not need to penetrate
the roof at the same elevation as the exhaust (as shown); lower down roof is oK.
•
to promote the projection of exhaust away from the building and from the
intake pipe, reduction of 3" pipe to 2" is permitted for a maximum lineal travel
of 3' (e.g. the final 3') including 2 x 90° elbows on each side.
•
Optional bird screen may be placed in a termination fitting. Leave unglued,
and hold in place with a short nipple. this permits easy access for cleaning.
•
For roof top venting of multiple boiler sets, group all intake terminals together
for a common penetration through a custom cap. alternatively, place in the
closest proximity achievable using commonly available pipe flashing. Similarly
group the exhaust pipes and place the 2 separate groups of pipes at least 3'
apart (the closest intake and exhaust pipes shall be 36" - or more - apart).
use the same 24" (minimum) vertical separation for all termination options.
For alternate group terminations, contact the iBC Factory for written guidance.
•
DO NOT exhaust vent into a common venting system.
WARNING
Condensate can cause
corrosion of metal roofing
components and other
roofing materials. Check
with the builder or roofing
contractor to ensure that
materials will be resistant to
acidic condensate. pH levels
can be as low as 3.0
Summary of Contents for VFC 15-150
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