IBC VFC 15-150 Installation And Operating Instructions Manual page 14

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
CAUTION
Vent termination clearances
in this section are
code minimum, or IBC
recommended minimum
requirements, and may
be inadequate for your
installation. Building envelope
details must be examined
carefully, and ingress of
moisture into building
structures is to be avoided.
Serious structural damage
may occur if adequate
precautions and clearances
are not allowed for.
These precautions are to be
observed for neighbouring
structures as well as for the
structure the boiler(s) are
installed in.
1-8
VFC 15-150, VFC 45-225 MODULATING GAS BOILERS
1.4.4 Venting Passage Through Ceiling and Floor
•
Confirm material meets local codes including fire stopping requirements.
•
Pipe clearances - no IBC requirements, but best practice allows a minimum 1/4"
gap around pipes to prevent binding and expansion noise; follow local codes.
•
All piping must be liquid and pressure tight.
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.
Figure 3: Rooftop vent terminal configurations
INSTALLATION AND OPERATION INSTRUCTIONS