13
Combustion Air
Exhaust
Figure 9
COMBUSTION AIR INTAKE OPTIONS: The RF000142
coupling (Figure 8) can be secured directly to the furnace
intake coupling if condensation/rain water is a concern. If
the RF000142 is used on the combustion air inlet, it must
be installed with the arrow pointing up. It should be noted,
the combustion air will actually be moving in a direction
opposite of the arrow on the RF000142 coupling. It must
have a field supplied, trapped drain tube free-draining to
a proper condensate disposal location. A loop in the drain
tube can serve as a trap. The unused RF000142 drain
fitting must be capped. A field supplied tee installed in
the intake pipe is also an acceptable method of catching
condensation. It must have a field supplied, trapped drain
tube or pipe, free-draining to a proper condensate disposal
location. A loop in the drain tube can serve as a trap.
Alternate Vent & Intake Pipe Connections
(Upflow/Horizontal Models Only)
When installing a furnace horizontally with the left side
down, alternate flue and combustion air pipe connections
may be used. This method allows the flue and combustion
air piping to be run vertically through the side of the furnace
(facing up in horizontal left). The alternate vent location
is the 3” hole directly in line with the induced draft blower
outlet.
When using the horizontal alternate vent configuration, you
must use the RF000142 vent drain kit. See Figures 10 & 11
& follow steps below.
NOTE: In the horizontal left installation
position, a means of condensate collection must
be provided to keep vent pipe condensate from
entering the draft inducer housing. If the vent
drain elbow is eliminated from the installation,
the RF000142 kit must be used.
Insert flange. Cut 2 ½” long
.
RF000142
2 ½”
Figure 10
Vent/Flue Pipe Cuts
Figure 11
WARNING
The rubber elbow is not designed to support a load. When
the rubber elbow is mounted externally to the furnace
cabinet, extreme care must be taken to adequately support
field-supplied vent/flue piping, as damage can result in leaks
causing bodily injury or death due to exposure to flue gas
-
es, including carbon monoxide.
CAUTION
Be sure not to damage internal wiring or other components
when reinstalling coupling and screws.
1.
Remove the four screws from the vent pipe flange on
top the furnace.
2. Remove the internal elbow, vent pipe and gasket.
3.
Cut the internal vent pipe 2 1/2” from the flange.
Discard the un-flanged section.
4. Remove the 3” plastic plug (in line with the inducer
outlet) and insert it in the space vacated by removal of
the internal vent pipe.
5. Install the RF000142 drain coupling with arrow facing
up, on the draft inducer outlet.
6.
Insert the 2 1/2” flanged section of pipe with gasket
through the 3” hole and connect to RF000142 drain
coupling. Secure it with gear clamp provided.
