# 45466K003
Page 6
Category IV Furnace Limitations
This furnace shall
not
be connected to any Type B, BW, or
L vent or vent connector and shall
not
be connected to
any portion of a factory-built or masonry chimney.
This
furnace is not to be common vented with any other
appliance. The vent pipe must not be connected to a
chimney flue serving a separate appliance designed
to burn solid fuel.
Vent Pipe Size and Length
The vent pipe and air intake pipe (in direct vent installa-
tions) should be sized in accordance with the information
found in the appropriate table in Figure 3. One 90
°
elbow
is equivalent to 5' of pipe. Two 45
°
elbows are equivalent
to one 90
°
elbow. The minimum length certified for use
with this furnace is 5' and one elbow, not including the
vent and air intake terminals.
In the event that the pipe length is in between the lengths
listed in the table, use the next larger length listed. For
example, if a length of pipe needed to install the furnace is
27', use the diameter values for the 30' row in the tables.
In all applications where the flue pipe is run through
an unconditioned space, 1/2
"
Armaflex or equivalent
must be used over the pipe. In extreme cold climates,
3/4
"
Armaflex is recommended.
Materials
All pipe, fittings, primer, and solvent cement must conform
with American National Standard Institute and the Ameri-
can Society for Testing and Materials (ANSI/ASTM)
standards. The solvent shall be free flowing and contain
no lumps, undissolved particles, or any foreign matter that
adversely affects the joint strength or chemical resistance
of the cement. The cement shall show no gelation, stratifi-
cation, or separation that cannot be removed by stirring.
Refer to Table 2 for approved piping and fitting materials.
cement is recommended. Metal or plastic strapping may be
used for vent pipe hangers.
When making ABS joints, pieces can be prepared with a
cleaner. When joining ABS to PVC materials, use PVC
solvent cement as specified in ASTM D3138.
Preferred fittings are DWV style or long sweep. Seal all joints
gas tight with appropriate cement. In areas where vent and
air intake pipes are exposed to abnormal stress or are
subject to damage, schedule 80 pipe should be used.
Concentric Vent Kit
A concentric vent kit (model ACVK2) is available for use
when installing this furnace as a direct vent furnace and the
air intake and vent pipe are to be run through the same hole,
whether horizontally through the wall or vertically through the
roof (see Figure 2). Refer to the instructions included with
the concentric vent kit for installation specifics.
Table 2
Piping and Fitting Specifications
The primers and solvents used must also meet ASTM
specifications. PVC primer is specified in ASTM F656. Use
PVC solvent as specified in ASTM D2564 and ABS solvent
cement as specified ASTM D2235. Low temperature solvent
Figure 2
2"
Nominal
Pipe Size
3.5"
18"
5"
1"
11"
Concentric Vent Kit Dimensions
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