IBC SL 28-160 Installation And Operating Instructions Manual page 12

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
SL 28-160 MODULATING GAS BOILER
1.4.5 Rooftop Vent Termination
a) 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.
•
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.
•
DO NOT exhaust vent into a common venting system.
b) For Rooftop Direct Vent systems:
•
Rooftop, two pipe, direct vent configurations, including typical clearance
requirements, are shown in Figure 4.
•
The intake air pipe is not typically drained, so it must be terminated with a
down-turned elbow (see Figure 4).
•
The intake pipe does not need to penetrate the roof at the same elevation as
the exhaust (as shown); lower down the roof is OK.
•
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 2 pipe option. For
alternate group terminations, contact the IBC Factory for written guidance.
•
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 2' (61cm) above the roof line plus the anticipated snow line.
Figure 4: Rooftop vent terminal configurations
INSTALLATION AND OPERATION INSTRUCTIONS