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INSTALLATION INSTRUCTIONS
Figure 51
Optional Combustion Air Inlet Moisture Trap
Combustion Air and Vent Piping Insulation
Guidelines
NOTE: Use closed cell, neoprene insulation or equivalent.
The vent pipe may pass through unconditioned areas. The
amount of exposed pipe allowed is shown in Table 17 and
Table 18.
1. Using
winter
design
calculations), find appropriate temperature for your
application and furnace model.
2. Determine the amount of total and exposed vent pipe.
3. Determine required insulation thickness for exposed pipe
length(s).
4. When combustion air inlet piping is installed above a
suspended ceiling, the pipe MUST be insulated with
moisture resistant insulation such as Armaflex or other
equivalent type of insulation.
5. Insulate combustion air inlet piping when run in warm,
humid spaces.
6. Install the insulation per the insulation manufacturer's
installation instructions.
NOTE: Pipe length (ft / M) specified for maximum pipe lengths
located in unconditioned spaces (See Table 17 and Table 18)
cannot exceed total allowable pipe length as calculated from
Table 14 through Table 16.
440 01 4001 05
TO CODE−APPROVED DRAIN OR CONDENSATE PUMP
Representative drawing only, some models may vary in appearance.
temperature
(used
in
load
Specifications subject to change without notice.
Gas Furnace: (F/G)9MVT, (F/G)9MXT, (F/G)9MXE
Configure the Furnace
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
To route the vent pipe and combustion air pipe through
the furnace, the manufacturer supplied kit must be
used. Failure to properly seal the blower compartment
from the furnace vestibule could result in the
circulation
of
carbon
structure. The vent pipe and combustion air pipe must
be a continuous pipe while passing through the blower
compartment. Seals supplied in this kit must be
installed per the instructions provided. Follow all
procedures outlined in these instructions.
Install the Vent and Combustion Air Pipes
With the furnace installed in the required position, remove the
desired knockouts from the casing. It will be necessary to
remove one knockout for the vent pipe and the other knockout
for the combustion air connection. (See Figure 13)
Use a flat blade screwdriver and tap on the knockout on
opposite sides, where the knockout meets the casing. Fold the
knockout down with duct pliers and work the knockout back
and forth until it is removed. Trim any excess metal from the
knockout with tin snips.
The vent elbow can be rotated to the required location on the
casing if necessary. See Figure 52 to rotate the vent elbow:
L12F028
monoxide
throughout
the
45
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