18
S
TANDARD
F
URNACE
C
ONNECTIONS
It is the responsibility of the installer to ensure that the piping
connections to the furnace are secure, airtight, and adequately
supported.
V
ENT
P
IPE
C
ONNECTION
The vent pipe outlet is sized to accept 2” pipe. Secure vent/
flue pipe directly into the furnace fitting with the appropri-
ate 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 neces-
sary, clearances may be increased by creating an offset us-
ing 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
Figure 9A
VENT-DRAIN
Figure 9B
C
OMBUSTION
A
IR
P
IPE
D
IRECT
V
ENT
I
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 cou-
pling 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 com-
bustion 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 allows service removal of air intake
piping internal to the furnace blower compartment. The com-
bustion air intake pipe can also be secured directly to the coun-
terflow 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
ON
-D
IRECT
V
ENT
I
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
. U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
HOLE
PLUGS
.
WARNING
A
LTERNATE
V
ENT
/F
LUE
L
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.
