Vent And Combustion Air Piping; Contaminated Combustion Air - International comfort products N9MP1 Installation Instructions Manual

Vent and Combustion Air Piping

WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
Use methods described here to provide combustion
and ventilation air.
Single Pipe (N9MP1 Models)
This furnace is certified as a Category IV appliance. This furnace
requires ventilation openings to provide air for proper combustion
and ventilation of flue gases. All duct or openings for supplying
combustion and ventilation air must comply with the gas codes or
in absence of local codes, the applicable national codes.
When the installation is complete, see the "Venting and
Combustion Air Check" in this manual.
Dual Certified (N9MP2, N9MPD and *9MPD
Models)
This furnace is certified as a Category IV appliance. This furnace
can be installed as a direct vent furnace using outside air for
combustion or the furnace can use air from inside the structure for
combustion. The INLET air pipe is optional. If combustion air
comes from inside the structure, adequate make up air MUST be
provided to compensate for oxygen burned. See Confined Space
Installation in the Combustion and Ventilation Air chapter. If
combustion air is drawn from outside the structure, it MUST be
taken from the same atmospheric pressure zone as the vent pipe.

Contaminated Combustion Air

Installations in certain areas or types of structures will increase the
exposure to chemicals or halogens that may harm the furnace.
The following areas or types of structures may contain or have
exposure to the substances listed below. The installation must be
evaluated carefully as it may be necessary to provide outside air
for combustion.
•
Commercial buildings.
•
Buildings with indoor pools.
•
Furnaces installed in laundry rooms.
•
Furnaces installed in hobby or craft rooms.
•
Furnaces installed near chemical storage areas.
•
Permanent wave solutions for hair.
•
Chlorinated waxes and cleaners.
•
Chlorine based swimming pool chemicals.
•
Water softening chemicals.
•
De−icing salts or chemicals.
•
Carbon tetrachloride.
•
Halogen type refrigerants.
•
Cleaning solvents (such as perchloroethylene).
•
Printing inks, paint removers, varnishes, etc.
•
Hydrochloric acid.
•
Sulfuric Acid.
•
Solvent cements and glues
•
Antistatic fabric softeners for clothes dryers.
•
Masonry acid washing materials.
14
.
Specifications are subject to change without notice
Vent and Combustion Air Piping Guidelines
This furnace is approved for venting with Schedule 40 PVC,
CPVC, ABS fittings, and Cellular Core and SDR−26 PVC pipe.
Applicable ASTM Standards for Vent Materials
Sch. 40 SDR
Materials
Pipe Pipe
ABS D1527 __
PVC D1785 D2241
CPVC F441 F442
ABS to
−− −−
PVC
NOTE: 1) In Canada, all pipe, fittings & cements must conform to
applicable CSA standards or to local codes having jurisdiction.
2) Only use solvent cements that are marked for use with
the specific venting material.
3) ABS to PVC transition joints REQUIRE a special
solvent cement that meets the requirements of ASTM D3138.
4) Refer to ASTM D2855 for general procedure to use for
cementing plastic pipe and fittings.
NOTE: In order to create a seal that allows future removal of pipe,
RTV sealant MUST be used on the inlet pipe where it joins to the
furnace.
NOTE: All vent piping MUST be installed in compliance with local
codes or ordinances, these instructions, good trade practices, and
codes of country having jurisdiction.
1. Determine the best routing and termination for the vent pipe
and air inlet pipe by referring to all of the instructions and
guidelines in this Section.
2. Determine the size required for the vent pipe and air inlet
pipe.
3. Loosely assemble all venting parts without adhesive (pipe
joint cement) for correct fit before final assembly.
4. Furnace shall be installed so as to prevent the accumulation
of condensate.
5. Use of vertical piping is preferred because there will be
some moisture in the flue gases that may condense as it
leaves the vent pipe (See Instruction For Horizontal Vents).
6. The vertical vent pipe MUST be supported so that no weight
is allowed to rest on the combustion blower.
7. Exhaust vent piping or air inlet piping diameter MUST NOT
be reduced.
8. All exhaust vent piping from the furnace to termination
MUST slope upwards. A minimum of
(6.4mm per 304.8mm) of run is required to properly return
condensate to the furnace drain system.
9. Use DWV type long radius elbows whenever possible, as
they provide for the minimum slope on horizontal runs and
they provide less resistance in the vent system. If DWV
elbows cannot be used, use two, 45° elbows when possible.
On horizontal runs the elbows can be slightly misaligned to
provide the correct slope.
10. All horizontal pipe runs MUST be supported at least every
five feet with galvanized strap or other rust resistant
material. NO sags or dips are permitted.
Cell
Solv.
Core
Fittings Primer
Cement
Pipe
D2468
F628 & −− D2235
D2661
D2466
&
F891 F656 D2564
D2665
−− F438 −− F493
−− −− −− D3138
1
/ " per foot per
4
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