International comfort products N9MP1 Installation Instructions Manual page 30

Concentric Vent Dimensional
Figure 31
Drawing
B PVC
Vent/Exhaust
1
1 / ² ² ² ²
2
B
PVC Intake/Combustion Air
Model A*
7
NAHA001CV 38 /
8
3
NAHA002CV 33 /
8
* = Dimension will change accordingly as dimension D is
lengthened or shortened.
** = Dimension D may be lengthened to 60² may also be
shortened by cutting the pipes provided in the kit to 12²
minimum
Concentric Termination Kit
Table 5 NAHA001CV & NAHA002CV Venting
Table for *9MPD Models
75,000 Btuh Furnaces
NAHA002CV - - 35¢ & (4) 90° elbows with 2² PVC pipe or
NAHA001CV - - 65¢ & (4) 90° elbows with 3² 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
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 thick-
ness requirement, the two pipes supplied in the kit may be re-
placed 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 60². (See Figure 31)
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 4² diameter kit pipe. (See
Figure 32) B) Cement the 3² rain cap to the 2
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)
30
C
D
25--22--03
A
B C D**
1 1
3 4 / 21 /
2 8
1 7
2 3 / 16 /
2 8
and 3 vents.
² ²
1
/ ² diameter
2
Rain Cap to Vent Pipe Assembly
Figure 32
25--22--02
WARNING
!
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.
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.
Drill clearance hole in rain
cap and pilot hole in vent pipe.
Stainless steel screw
(Field supplied)
440 01 1021 01