31
440 01 2021 01
ing Pipe and Fittings section of the manual. A) Cement the Y
Concentric fitting to the 4
²
diameter kit pipe. (See
Figure 32)
B) Cement the 3
²
rain cap to the 2
1
/
2
²
diameter
kit part. (See
Figure 32) NOTE:
A field supplied stainless
steel screw may be used to secure the rain cap to the pipe
instead of cementing when field disassembly is desired for
cleaning (See
Figure 32)
Figure 32
Rain Cap to Vent Pipe Assembly
Drill clearance hole in rain cap and pilot hole in
vent pipe.
Stainless steel screw
(Field supplied)
25--22--02
CARBON MONOXIDE POISONING HAZARD.
Failure to follow this warning could result in death
or personal injury.
When using the alternate screw assembly method,
drill a clearance hole in the rain cap and a pilot hole
in the vent pipe for the screw size being used.
Failure to drill adequate holes may cause cracking
of the PVC components, allowing flue gases to be
recirculated.
!
WARNING
CARBON MONOXIDE POISONING HAZARD.
Failure to follow this warning could result in death
or personal injury.
Do not operate the furnace with the rain cap
removed as recirulation of the flue gases may
occur. Water may also collect inside the larger
combustion air pipe and flow to the burner
enclosure.
!
WARNING
6. Install the Y concentric fitting and the pipe assembly through
the structure’s hole. For vertical termination, install the parts
through the field supplied roof boot/flashing.
NOTE:
Do not
allow insulation or other materials to accumulate inside the
pipe assembly when installing through the structure’s hole.
7. Secure the assembly to the structure as shown in
Figure 30
or
Figure 34
using field supplied metal strapping or equiva-
lent material.
NOTE:
Ensure the termination height is above the roof sur-
face or anticipated snow level as shown in
Figure 30
for
vertical termination. Ensure the termination location clear-
ance dimensions are as shown in
Figure 33
and
Figure 34
for horizontal termination.
1
²
max.
Maintain 12
²
clearance above highest
anticipated snow level or grade
whichever is greater.
Figure 33
Concentric Vent and Combustion--Air
Side Termination
Combustion
Air
Vent
25--22--02
12
²
min.
Roof Overhang
Combustion
Air
Vent
Combustion
Air
Concentric Vent Sidewall
Attachment
Vent
45
°
Elbow
(Field Supplied)
25--22--02
Strap
(Field Supplied)
Flush to
1
²
max.
Note:
Securing strap must be field installed to prevent movement of termina-
tion kit in side wall.
Figure 34
8. Install the rain cap and the small diameter pipe assembly in
the Y concentric fitting and the large pipe assembly. Ensure
that the small diameter pipe is bottomed out and securely
cemented in the Y concentric fitting.
9. Cement the furnace combustion air and vent pipes to the
concentric vent termination assembly. See
Figure 30
or
Figure 34
for proper pipe attachment.
10. Operate the furnace through one heat cycle to ensure com-
bustion air and vent pipes are properly connected to the
concentric termination connections.
Summary of Contents for *9MPT050F12
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