!WARNING:
Ensure that the combustion air vent and the exhaust vent are configured as shown in Figure 19 and 20. Improper vent termination can cause recir- culation of the flue gases. This may result in furnace vibration. In severe cases, the furnace will cycle due to the intermittent contact between the flame and the flame sensor. If you note oscillations occurring, check the vent configuration. Make sure that the exhaust vent does not have a 90 degree termination.
Vent and combustion air intake terminations must be located to ensure proper furnace operation and to conform to applicable codes. Figure 19 and 20 illustrates necessary distances from the vent termination to windows and building air in- takes.In Canada,the Canadian Fuel Gas Code takes precedence over these instructions. Specifically, all minimum distance require- ments with respect to termination of the vent piping listed below (items 1 through 8).
The following list is a summary of vent terminal location requirements:
1.The termination must be 12 inches above snow level or grade level whichever is higher. See Figure 18 for alternate method to achieve 12” above snow level.
2.The minimum distance for a
3.The minimum distance for a direct vent (2- pipe) installation from any door, (openable) window, or air gravity inlet is 1 ft. below, 1 ft. horizontally, or 1 ft. above.
4.For
5.The vent termination for a
6.The vent termination shall be located at least 3 ft.horizontally from any electric meter, gas meter, regulator and any relief equipment in accordance to ANSI 2223.1/NFPA S4.
These distances apply ONLY to U.S. instal- lations. In Canada, the Canadian Fuel Gas Code takes precedence.
7.Avoid areas where condensate drainage may cause problems by dropping on plant- ers or patios, etc. Also ensure that exhaust gases will not impinge on windows or build- ing surfaces, which may be compromised or damaged by condensation. Do not install the vent terminal such that exhaust is directed into window wells, stairwells, under decks or into alcoves or similar recessed areas, and do not terminate above any public walkways.
8.Select the point of wall penetration where the minimum 1/4 inch per foot of slope up can be maintained.
!CAUTION:
For optimum performance, vent fur- nace through wall which experiences the least exposure to winter winds.
For Canadian installations please refer to the Canadian Installation Code
The horizontal venting kits consist of two face plates and an insulating gasket to seal the exterior surface. A hole sized closely to the pipe diameter must first be cut through the wall. A short length of pipe is then cut such that it can penetrate the wall and be held in place by closely fitting standard couplings.The face plates are retained on both sides of the wall by the couplings, and the gasket is retained against the wall by the outer face plate. Face plates must be fastened to the wall and the outside one must be flashed as appropriate to prevent entry of water.
When the horizontal kits are not used, the fol- lowing steps are required:
1.Check the hole size cut through the exterior wall. Insure that the hole diameter is less than the diameter of the couplings to be used.
2.Extend the vent pipe through the wall ap- proximately 1” and seal the area between the wall and pipe.
3.If required by local code, apply couplings to the vent pipe on the interior and exterior sides of the wall to insure the pipe can not be pushed or pulled through the wall.
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