International comfort products C9MVX Installation Instructions Manual page 16

10. All horizontal pipe runs MUST be supported at least
every five feet with galvanized strap or other rust
resistant material. NO sags or dips are permitted.
11. All vertical pipe runs MUST be supported every six feet
(1.8m) where accessible.
12. The maximum pipe length is 40' (12.2m) total in the inlet or
outlet side of the system. Up to five, 90° elbows can be used
on the inlet or the outlet. With the Concentric Vent
Termination Kits (NAHA001CV or NAHA002CV), the
maximum pipe length is 35' (10.7m) with four 90° elbows. If
more elbows are required, reduce the length of both the inlet
and exhaust pipes 5' (1.5m) for each additional elbow used.
(See Table 3 or Table 4).
13. The minimum vent length is 5' (1.5m) of PVC.
14. The piping can be run in the same chase or adjacent to
supply or vent pipe for water supply or waste plumbing. It
can also be run in the same chase with a vent from another
90+ furnace.
NOTE: In NO case can the piping be run in a chase where
temperatures can exceed 140° F (60° C). or where radiated
heat from adjacent surfaces would exceed 140° F(60° C).
15. The vent outlet MUST be installed to terminate in the same
atmospheric pressure zone as the combustion air inlet.
16. The vent system can be installed in an existing unused
chimney provided that:
•
Both the exhaust vent and air intake run the length of the
chimney.
•
No other gas fired appliance or fireplace (solid fuel) is
vented into the chimney.
•
The top of the chimney MUST be sealed flush or crowned
up to seal against rain or melting snow so ONLY the piping
protrudes.
•
The termination clearances shown in Figure 8 are
maintained.
17. Furnace applications with vertical vents requiring vent
diameter increaser fittings must have increaser fittings
installed in vertical portion of the vent. Condensate will be
trapped in the vent if the vent diameter is increased prior to
having an elbow turned upward. This could cause nuisance
tripping of the pressure switch.
Combustion Air and Vent Piping Insulation
Guidelines
NOTE: Use closed cell, neoprene insulation or equivalent. If
Fiberglass or equivalent insulation is used it must have a vapor
barrier. Use R values of 7 up to 10' (3.1m), R−11 if exposure
exceeds 10' (3.1m). If Fiberglass insulation is used, exterior to the
structure, the pipe MUST be boxed in and sealed against moisture.
1. When the vent or combustion air pipe height above the roof
exceeds 30" (76.2mm), or if an exterior vertical riser is used
on a horizontal vent to get above snow levels, the exterior
portion MUST be insulated.
2. When combustion air inlet piping is installed above a
suspended ceiling, the pipe MUST be insulated with
moisture resistant insulation such as Armaflex or other
equivalent type of insulation.
3. Insulate combustion air inlet piping when run in warm,
humid spaces.
Sizing Combustion Air and Vent Pipe
Consult Table 3 or Table 4 to select the proper diameter exhaust
and combustion air piping. Exhaust and combustion air piping is
sized for each furnace Btuh size based on total lineal vent length
(on inlet or outlet side), and number of 90° elbows required.
1. Double Pipe Installation−If installing as a direct−vent
appliance, consult Table 4 to select the proper diameter
exhaust and combustion air piping. Exhaust and
combustion air piping is sized for each furnace Btuh size
based on total lineal vent length (on inlet or outlet side), and
number of 90° elbows required.
2. Single Pipe Installation−If installing as a non−direct vent
appliance, (single outlet pipe and no inlet pipe) refer to
Table 3. The table shows the maximum number of elbows
allowed with any given pipe diameter and length of run.
16
3. Use of Elbows−Two 45° elbows can be substituted for one
90° elbow. The elbow or elbows used for vent termination
outside the structure ARE counted, including elbows
needed to bring termination above expected snow levels.
Table 3
40,000, 50,000, 60,000 & 75,000 Btuh Furnaces
404 (12.2m) & (5) 90° elbows with 2" (50.8mm) PVC pipe
404 (12.2m) & (5) 90° elbows with 3" (76.2mm) PVC pipe
404 (12.2m) & (5) 90° elbows with 3" (76.2mm) PVC pipe
The minimum vent length is 54 (1.5m) of PVC. Elbows are
DWV Long Radius Type for 2
vents.
If more than five elbows are required, reduce the length of both
the inlet and exhaust pipes 5' (1.5m) for each additional elbow
used. If less than five elbow are required, the length can be
INCREASED by 5' (1.5m) for each additional elbow NOT used.
NOTE: It is allowable to use larger diameter pipe and fitting than
shown in the tables but not smaller diameters than shown.
Table 4
40,000, 50,000, 60,000 & 75,000 Btuh Furnaces
404 (12.2m) & (5) 90° elbows with 2" (50.8mm) PVC pipe
40' (12.2m) & (5) 90° elbows with 3" (76.2mm) PVC pipe
40' (12.2m) & (5) 90° elbows with 3" (76.2mm) PVC pipe
The minimum vent length is 54 (1.5m) of PVC. Elbows are
DWV Long Radius Type for 2
vents.
If more than five elbows are required, reduce the length of both
the inlet and exhaust pipes 5' (1.5m) for each additional elbow
used. If less than five elbow are required, the length can be
INCREASED by 5' (1.5m) for each additional elbow NOT used.
* Feet (meters) of pipe is whichever pipe run is the longest,
either inlet or outlet side.
For concentric
Termination tables in this manual.
Vent Termination Clearances
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in death
personal injury or death.
Inlet and outlet pipes may NOT be vented directly
above each other.
1. Determine termination locations based on clearances
specified in following steps and as shown in Figure 8,
Figure 9, Figure 22, through Figure 30.
For concentric vent termination clearances, refer to
Concentric Termination Kit instructions.
2. This furnace is Dual Certified and can be installed as a
single pipe appliance (all combustion from inside the
structure) or as a direct vent appliance where all
combustion air is taken from outside the structure.
3. For Single Pipe installation refer to Figure 9 for vent
termination clearances.
4. For Direct Vent installation, refer to Figure 8 for vent
termination.
Specifications are subject to change without notice.
Pipe Diameter Table
Single Piping ONLY
80,000 & 100,000 Btuh Furnace
125,000 Btuh Furnace
(50.8mm) and 3
"
Pipe Diameter Table
Dual Piping ONLY
80,000 & 100,000 Btuh Furnace
125,000 Btuh Furnace
(50.8mm) and 3
"
vent pipe diameter
WARNING
(76.2mm)
"
(76.2mm)
"
see Concentric
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