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Installation Instructions
8.3 Combustion Air And Vent Piping Assembly
The final assembly procedure for the combustion air and vent piping
is as follows:
1.
Cut piping to the proper length beginning at the furnace.
2.
Deburr the piping inside and outside.
3.
Chamfer (bevel) the outer edges of the piping.
4.
Dry-fit the vent piping assembly from the furnace to the outside termination
checking for proper fit support and slope.
5.
Dry-fit the combustion air piping assembly checking for proper fit, support
and slope on the following systems:
a.
Sealed combustion air systems from the furnace to the outside
termination.
b.
Ventilated combustion air systems from the furnace to the attic or
crawl space termination.
CAUTION:
Solvent cements are flammable and must be used in well-
f
ventilated areas only. Keep them away from heat, sparks
and open flames. Do not breathe vapors and avoid contact
with skin and eyes.
6.
Disassemble the combustion air and vent piping, apply cement primer and
the cement per the manufacturer's instructions. Primer and cement must
conform to ASTM D2564 for PVC, F493 for CPVC or ASTM D2235 for ABS
piping.
7.
All joints must provide a permanent airtight and watertight seal.
Support the combustion air and vent piping such that it is angled a
8.
minimum of 1/4" per foot (21 mm/m) so that condensate will flow back
towards the furnace. Piping should be supported with pipe hangers to
prevent sagging.
9.
Seal around the openings where the combustion air and / or vent piping
pass through the roof or sidewalls.
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Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
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