Carrier 58HDX - Connecting Vent and Combustion Air Piping; Combustion Air Pipe Connection (Dual Certified or Direct Vent); Vent Pipe Connection

before operation. Verify all condensate drain connections are
securely clamped. A coupling and clamps (in loose part bag) may
be installed as shown for future servicing of the vent system.
Open Tee
Tee Trap
Evaporator
Coil
Drain Line
(Optional)
“on
. a
Condensate
Trap
Representative drawing only, some models may vary in appearance.
A07713
Fig. 19 - Connecting Tee Trap to Condensate Trap and Main
Drain Line
The tee trap must be connected to the main condensate drain line
as conceptually shown above. Different installations may require
slightly different orientations. The following steps apply to all
installations.
1. The tee trap should be installed as close to the side or top
of the furnace as practical. Minimize the distance between
the inducer and the tee trap as much as possible.
2. An open tee is to be used at the tee trap discharge. The top
end of the tee should be open to the atmosphere to elimin-
ate potential air lock problems.
3. The drain line from the tee trap is to be connected to the
furnace condensate trap drain line as shown above.
4. Condensate drain lines from a cooling coil may be connec-
ted downstream of the connection point of the tee trap and
furnace condensate trap.
IMPORTANT: Prime both traps with water before operation.
Failure to prime the traps may result in discharge of flue gases
from the condensate drain line and open tee for a period of time,
and may result in temporary lockout of the furnace upon start up.
Main drain line construction is left to the discretion of the
installer. It may be made of either rigid pipe or flexible tube.
Tube ID should NOT be less than Voy,
Connecting Vent and Combustion Air Piping
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or
death.
Cement or mechanically seal all joints, fittings, etc. to prevent
leakage of flue gasses.
Refer to Fig. 10 through Fig. 18 that corresponds to the
installation position of the furnace for the application.
Preassemble the vent and combustion air piping from the furnace
to the vent termination. Do not cement the pipe joints until the
pipe preassembly process is complete.
Combustion Air Pipe Connection (Dual Certified or
Direct Vent)
Install the air intake coupling and gasket to the furnace with the
four(4) screws:
NOTE: The air intake coupling and gasket can be installed to the
top panel, or to the alternate air intake locations on either the left
or right side panels of the furnace.
For downflow installation, the air intake coupling and gasket
must be installed to the alternate air intake location on either the
left or right side panels. Remove the 3” (76 mm) hole plug from
the furnace accessory bag and relocate to the open hole in the
furnace panel. Use four screws to seal the four mounting holes in
the top panel next to the hole plug. Drill four 7/64” (3 mm)
diameter holes in the casing using the air intake coupling as the
template.
The air intake coupling is sized for 2” (51 mm) PVC pipe.
Install the combustion air pipe to the air intake coupling using
RIV sealant to provide for future serviceability.
Vent Pipe Connection
Install the vent pipe grommet to the furnace panel. Locate the
grommet in the furnace panel at a location directly away from the
vent fitting on the combustion blower. The grommet snaps into
the 3” (76 mm) hole on the furnace panel. NOTE: Depending on
the installation position, the vent pipe grommet will be installed
to the top panel or to the alternate location on the side panels. If
needed, remove the 3” (76 mm) hole plug from the loose parts
bag and relocate to the open hole in the furnace panel. (See Fig.
10 or Fig. 19.)
Install the vent pipe to the rubber coupling, the vent fitting or the
PVC vent extension pipe. Securely attach using the clamp or
PVC cement as required.
NOTE: The vent fitting MUST be installed with the air flow
marking arrow pointed toward the vent pipe. (See Fig. 20.)
Some installations require the vent fitting to be installed with
a 5° to 10° downward slope. (See Fig. 10 through Fig. 19.)
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