IBC HC Series Installation And Operating Instructions Manual page 14

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.
Figure 5a: Rooftop exhaust venting
with sidewall combustion air.
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
1-8
HC SERIES BOILERS HC 13-50, HC 23-84, HC 29-106, HC 20-125, HC 33-160
1.4.5 Rooftop Vent Termination
DIRECT VENT - TWO PIPE
Rooftop vents must terminate as follows:
•
The exhaust pipe can terminate in an open vertical orientation without concern
about rain infiltration; rain will drain away through the condensate trap.
•
The intake air pipe is not typically drained, so it must be terminated with a down-
turned elbow (see Figure 5). The intake pipe does not need to penetrate the roof
at the same elevation as the exhaust; lower down the roof is OK.
•
The air intake pipe may terminate on the side wall of the building as long as
the air intake terminal is turned down and the side wall of the building is not
exposed to large wind loads i.e.: prevailing winds.
•
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 12" (minimum) vertical separation for 2 pipe option. For
alternate group terminations, contact the IBC Factory for written guidance.
•
DO NOT exhaust vent into a common venting system.
Figure 5: Rooftop vent terminal configurations
DIRECT VENT CONCENTRIC ROOF TOP TERMINATION
Roof Top Concentric Termination Kits are approved for use with this boiler model.
The installation of the vertical roof top concentric termination must follow the
installation instructions supplied with the venting material manufacturer. Care must
be taken to install the termination kit a minimum horizontal distance of 10' (305cm)
away from any portion of the building and a minimum of 18" (46cm) above the roof
line plus the anticipated snow line. See Figure 6 and 7 on page 1-9.
INSTALLATION AND OPERATION INSTRUCTIONS