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Standard Furnace Connections
It is the responsibility of the installer to ensure that the piping
connections to the furnace are secure, airtight, and adequately
supported.
Vent/Flue Pipe
The vent pipe outlet is sized to accept 2” pipe. Secure vent/
flue pipe directly into the furnace fitting with the appropriate
glue. Alternately, a small section of 2” pipe may be glued
in the furnace socket and a rubber coupling installed to
allow removal for future service. Combustion Air and Vent
piping should be routed in a manner to avoid contact with
refrigerant lines, metering devices, condensate drain lines,
etc. If necessary, clearances may be increased by creating
an offset using two 45 degree elbows. This joint can be ro-
tated on the fitting to establish maximum clearance between
refrigerant lines, metering devices, and condensate drain
lines, etc. This joint is the equivalent of one 90 deg. elbow
when considering elbow count. (Figure 8A)
V
E
N
T
45 DEGREE
LONG-SWEEP
ELBOWS
Increased Clearance Configuration
Figure 8A
NOTE: For non-direct vent installations, a minimum of one
90° elbow should be installed on the combustion air intake
coupling to guard against inadvertent blockage.
D
V
i
irect
ent
nstallations
WARNING
E
. U
DGES OF SHEET METAL HOLES MAY BE SHARP
SE GLOVES AS A
.
PRECAUTION WHEN REMOVING HOLE PLUGS
On upflow units secure the combustion air intake pipe to
the air intake coupling by using a take apart rubber coupling
supplied with the furnace or a plastic coupling. Also, the
intake coupling may be inverted to allow the intake pipe to
be glued directly to it. After inverting the coupling, secure
it to the furnace top with screws. On counterflow units
secure the combustion air intake pipe to the air intake cou-
pling using the rubber coupling and worm gear hose clamps
provided with the unit. The counterflow rubber coupling
allows service removal of air intake piping internal to the
furnace blower compartment. The combustion air intake
pipe can also be secured directly to the counterflow unit
air intake pipe coupling.
COMBUSTION AIR INTAKE OPTIONS: The RF000142 coupling
can be secured directly to the furnace intake coupling if
condensation 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 proper condensate
disposal location. A loop in the drain tube can serve as a
trap. The unused RF000142 drain fitting should be capped.
(Figure 8B) A tee installed in the intake pipe is also an ac-
ceptable method of catching condensation. It must have
a field supplied, trapped drain tube or pipe, free-draining
to proper condensate disposal location. A loop in the drain
tube can serve as a trap.
Exhaust
Combustion Air
Tee Installation in Intake Pipe
Figure 8B
VENT-DRAIN
The RF000142 Coupling
Figure 8C
Page 15
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