Sears 9MPD User Manual
Page 46
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TciblH 11
Concentric Termination Kit
NAHA001CV & NAHA002CV Venting
Table for N9MP2 Models
50,000 & 80,000 Btuh Furnaces
NAHA002CV - 35' & (4) 90° elbows with 2” PVC pipe or
NAHA001CV - 65' & (4) 90° elbows with 3” PVC pipe
75,000 Btuh Furnaces
NAHA002CV - 20' & (2) 90° elbows with 2" PVC pipe or
NAHA002CV - 35' & (4) 90° elbows with 2" PVC pipe &
Long Vent Kit (See Tech. Manual) or
NAHA001CV - 65' & (4) 90° elbows with 3" PVC pipe
100,000 Btuh Furnace
NAHA001CV - 35' & (4) 90° elbows with 3" PVC pipe or
NAHA001CV - 65' & (4) 90° elbows with 3" PVC pipe &
Long Vent Kit (See Tech. Manual)
125,000 Btuh Furnace
NAHA001CV - 35' & (4) 90° elbows with 3" PVC pipe
1. Do not include the field supplied 45° elbow in the total elbow
count.
2. If more than four elbows are required, reduce the length of
both the inlet and the exhaust pipes five feet for each
additional elbow used.
3. Elbows are DWV long radius type for 2" and 3” vents.
NOTE: Feet of pipe is whichever pipe run is the longest, either
inlet or outlet side.
If assembly needs to be extended to meet height or side wall
thickness requirement, the two pipes supplied in the kit may be
replaced by using the same diameter solid, single (no coupling
connections) field supplied SDR-26 PVC (ASTM D2241) pipes.
Do not extend dimension D more than 60". (See
Figure 46)
Do not use field supplied couplings to extend the pipes.
Airflow restriction will occur and the furnace pressure
switch may cause intermittent operation.
5. Partially assemble the concentric vent termination kit.
Clean and cement the parts using the procedures for Join
ing Pipe and Fittings section of the manual. A) Cement the
Y Concentric fitting to the 4" diameter kit pipe. (See
Figure 47)
B) Cement the 3" rain cap to the 2 V
2
" diameter
kit part. (See
Figure 47) 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 47)
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in death,
personal injury and/or property damage.
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.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in death,
personal injury and/or property damage.
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.
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 accu
mulate inside the pipe assembly when installing through
the structure's hole.
7.
Secure the assembly to the structure as shown in
Figure 45
or
Figure 49
using field supplied metal strap
ping or equivalent material.
NOTE:
Ensure the termination height is above the roof sur
face or anticipated snow level as shown in
Figure 45
for
vertical termination. Ensure the termination location clear
ance dimensions are as shown in
Figure 48
and
Figure 49
for horizontal termination.
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