International comfort products C9MPX Installation Instructions Manual page 15

12. The minimum vent length is 5' (1.5m) of PVC.
13. 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).
14. The vent outlet MUST be installed to terminate in the same
atmospheric pressure zone as the combustion air inlet.
15. 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 & Figure 9
are maintained.
16. 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 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. 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. The elbow inside the furnace on the *9MPX IS NOT
included in the count.
440 01 1051 02
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 elbows 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.
For "Concentric Termination Kit" Venting see Table 4 in
this manual.
Vent Termination Clearances
CARBON MONOXIDE POISONING
Failure to follow this warning could result in
personal injury or death.
Inlet and outlet pipes may NOT be vented directly
above each other.
For "Concentric Termination Kit" clearances, see Figure 31,
through Figure 36 in this manual.
Specifications are subject to change without notice.
Pipe Diameter Table
Table 3
60,000 BTUH Furnaces
10' (3m) & (2) 90° elbows with 1.5" (38.1mm) PVC pipe or
40' (12.2m) & (5) 90° elbows with 2" (50.8mm) PVC pipe or
70' (21.3m) & (5) 90° elbows with 3" (76.2mm) PVC pipe
80,000 BTUH Furnace
40' (12.2m) & (5) 90° elbows with 2" (50.8mm) PVC pipe or
40' (12.2m) & (5) 90° elbows with 3" (76.2mm) PVC pipe
100,000 BTUH Furnace
10' (3m) & (2) 90° elbows with 2" (50.8mm) PVC pipe or
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
2 (50.8mm) and 3
Long Radius Type for
"
WARNING
!
1. Determine termination locations based on clearances
specified in following steps and as shown in Figure 8,
Figure 9, Figure 22 through Figure 24.
2. For Single Pipe Installation refer to Figure 9 for vent
termination clearances.
3. For Direct Vent Installation refer to Figure 8 for vent
termination clearances.
*9MPX Model
(76.2mm) vents.
"
15