Instruction manual
17
ADDITIONAL
PLUG FROM
DRAIN KIT
SECURE
TO CABINET
UPFLOW/HORIZONTAL SHOWN
(COUNTERFLOW SIMILAR)
REMOVE
3 SCREWS
REMOVE
4 SCREWS
REMOVE
4 SCREWS
REMOVE
AND
RELOCATE
.
REMOVE
AND
RELOCATE
REMOVE
AND CUT
REMOVE
UPFLOW
COUNTERFLOW
5
4
1
2
2
3
3
1
1
3
2" CLEARANCE
REQUIRED
(NON-DIRECT
VENT)
5
Alternate Combustion Air Intake Location
NON-DIRECT VENT (SINGLE PIPE) PIPING
Non-direct
vent
installations require only a vent/flue pipe.
The vent pipe can be run horizontally with an exit through
the side of the building or run vertically with an exit through
the roof of the building. The vent can also be run through
an existing
unused
chimney; however, it must extend a
minimum of 12 inches above the top of the chimney. The
space between the vent pipe and the chimney must be
closed with a weather-tight, corrosion-resistant flashing.
For details concerning connection of the vent/flue pipe to
the furnace, refer to
Section IX, Vent/Flue Pipe and Com-
bustion Air Pipe - Standard Furnace Connections or Alter-
nate Furnace Connections
for specific details. Refer to the
following
Non-Direct Vent (Single Pipe) Piping - Vent/Flue
Pipe Terminations
for specific details on termination con-
struction.
Although
non-direct
vent
installations do not require a
combustion air intake
pipe
, a minimum of one 90° elbow
must be attached to the furnace’s combustion air intake
if
:
an upright installation uses the standard intake location, or
a horizontal installation uses the alternate air intake loca-
tion. This elbow will guard against inadvertent blockage of
the air intake.
Vent/Flue Pipe Lengths and Diameters
Refer to the following table for applicable length, elbows,
and pipe diameter for construction of the vent/flue pipe
system of a non-direct vent installation. In addition to the
vent/flue pipe, a single 90° elbow must be secured to the
combustion air intake to prevent inadvertent blockage.
The tee used in the vent/flue termination must be included
when determining the number of elbows in the piping
system.
Unit Input
(
BTU
)
Pipe
Size
(inc.)2345678
45,000 2 68 65 62 59 56 53 50
70,000 2 68 65 62 59 56 53 50
90,000 2 60 57 55 52 50 47 45
115,000
2 45424037353230
[0 - 4,500 ft] 3 111 107 104 100 97 93 90
115,000 2 25 22 20 17 15 12 10
[4,500 - 11,000 ft]
3 58555249464340
Non-Direct Vent (Single Pipe)
Maximum Allowable Length of Vent/Flue Pipe (ft)
(1) (2)
Number of Elbows
(3)
(1) One 90° elbow must be secured to the combustion air intake connec-
tion.
(2) Minimum vent length is five feet and one elbow/tee.
(3) Tee used in the vent/flue termination must be included when deter-
mining the number of elbows in the piping system.
Vent/Flue Pipe Terminations
The vent/flue pipe may terminate vertically, as through a
roof, or horizontally, as through an outside wall.
Vertical vent/flue pipe terminations should be as shown in
the following figure. Refer to
Section IX, Vent/Flue Pipe
and Combustion Air Pipe - Termination Locations
for
details concerning location restrictions. The penetration of
the vent through the roof must be sealed tight with proper
flashing such as is used with a plastic plumbing vent.
12 " Min To
Roof Or
Highest Anticipated
Snow Level
TEE
Vertical Termination (Single Pipe)
12" Min.
90º
Medium Radius
Elbow
Alternate Vertical Termination (Single Pipe)