International comfort products N9MP1 Installation Instructions Manual page 28

Connecting Tee Trap to Condensate
Figure 20
Trap and Main Drain Line
Open Tee
Tee Trap
Evaporator
Coil
Drain Line
(Optional)
Main
Drain
Line
Condensate
Trap
Representative drawing only, some models may vary in appearance.
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
eliminate 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
connected 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 ridged pipe or flexible
tube. Tube ID should NOT be less than
28
V E N
T
ON
OFF
25-24-85
1
/ (12.7mm).
2"
Specifications are subject to change without notice
Connecting Vent and Combustion Air Piping
WARNING
!
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 gases.
Refer to Figure 11 through Figure 19 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 (
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 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" (76.2mm) hole plug from the side
panel and relocate to the air intake hole in the top panel. Use four
screws to seal the four (4) mounting holes in the top panel next to
7
the hole plug. Drill four (4)
casing using the air intake coupling as the template.
The air intake coupling is sized for 2" (50.8mm) PVC pipe.
Install the combustion air pipe to the air intake coupling using RTV
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" (76.2mm) hole plug from 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" (76.2mm) hole plug from the furnace panel
and relocate to the open hole in the furnace panel. (See Figure 11
or Figure 20)
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 Figure 21)
Some installations require the vent fitting to be installed with
a 55 to 105 downward slope. (See Figure 11 through Figure 20)
Dual Certified or
/ " (2.8mm diameter holes in the
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