SYSTEM OPERATION
14
Carefully follow the pipe manufacturers’ instructions for
cutting, cleaning, and solvent cementing PVC and/or ABS.
The vent can be run through an existing unused chimney
provided the space between the vent pipe and the chimney is
insulated and closed with a weather-tight, corrosion-resistant
flashing.
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 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. (See Figure 7)
45 DEGREE
LONG-SWEEP
ELBOWS
V
E
N
T
Increased Clearance Configuration
Figure 8
VENT-DRAIN
CAP TO BE INSTALLED
ON UN-USED DRAIN PORT
CLAMPS TO BE
PLACED INTO
GROOVES
ON DRAIN
AS SHOWN.
Figure 9
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.
Combustion Air Pipe
Direct Vent Installations
E
DGES
OF
SHEET
METAL
HOLES
MAY
BE
SHARP
. U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
HOLE
PLUGS
.
WARNING
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 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.
Insert flange. Cut 2 ½” long.
Figure 9
RF000142
Figure 10
2 ½”
C
U
T
H
ER
E
FLANGE
Figure 11
