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S
F
C
TANDARD
URNACE
ONNECTIONS
It is the responsibility of the installer to ensure that the pip-
ing connections to the furnace are secure, airtight, and ad-
equately supported.
V
P
C
ENT
IPE
ONNECTION
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 rotated 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.
45 DEGREE
ELBOWS
Increased Clearance
C
A
P
OMBUSTION
IR
IPE
D
V
I
IRECT
ENT
NSTALLATIONS
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
coupling using the rubber coupling and worm gear hose clamps
provided with the unit. The counterflow rubber coupling al-
Figure 9A
VENT-DRAIN
Figure 9B
lows service removal of air intake piping internal to the fur-
nace 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 dis-
posal location. A loop in the drain tube can serve as a
trap. The unused RF000142 drain fitting should be capped.
A 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 proper conden-
sate disposal location. A loop in the drain tube can serve as
a trap.
N
-D
V
I
ON
IRECT
ENT
NSTALLATIONS
A minimum of one 90° elbow should be installed on the combus-
tion air intake "coupling" to guard against inadvertent block-
age.
E
DGES OF SHEET METAL HOLES MAY BE SHARP
PRECAUTION WHEN REMOVING HOLE PLUGS
A
V
/F
L
LTERNATE
ENT
LUE
OCATION
The alternate vent/flue location is the large hole directly in
line with the induced draft blower outlet. To use the alter-
nate vent/flue location on an upflow / horizontal model,
refer to the following steps and the "Alternate Vent/Flue Lo-
cation" figure. This feature is not currently available on
counterflow models.
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;
an RF000142 kit must be used.
WARNING
. U
SE GLOVES AS A
.
19
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