15
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.
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.
E
DGES
OF
SHEET
METAL
HOLES
MAY
BE
SHARP
. U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
HOLE
PLUGS
.
WARNING
Combustion Air Pipe
Direct Vent Installations
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
Exhaust
Tee Installation in Intake Pipe
Figure 8B
VENT-DRAIN
Figure 8C
COMBUSTION AIR INTAKE OPTIONS:
The RF000142 coupling
(Figure 8B) 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 combus-
tion 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 con-
densate disposal 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 condensate disposal location. A loop in the drain
tube can serve as a trap.
Insert flange. Cut 2 ½” long.
R 000142
F
Figure 9
Non-Direct Vent Installations
A minimum of one 90° elbow should be installed on the combus-
tion air intake “coupling” to guard against inadvertent blockage.
T
HE
RUBBER
ELBOW
IS
NOT
DESIGNED
TO
SUPPORT
A
LOAD
. W
HEN
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
GASES
,
INCLUDING
CARBON
MONOXIDE
WARNING
