1.Seal any unused opening in the common venting system.
2.Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion or other unsafe condition.
3.Isolate the space containing the appliance(s) remaining connected to the common venting system as much as possible by closing all openings (windows, doors, etc.) connected to other spaces in the building. Turn on any exhaust fans to their maximum setting and close fireplace dampers. Note: DO NOT operate summer exhaust fan.
4.Test fire the appliance(s) being inspected, making sure to follow the manufacturers lighting and operating instructions. Appliance(s) operating controls should be adjusted to provide continuous service.
5.Check vent pressure of appliance 24 inches (61.0 cm) above boiler vent collar. Vent pressure should be maintained between
6.After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and other gas burning appliances to their previous conditions of use.
All boiler venting systems shall be installed in accordance with the National Fuel Gas Code, ANSI Z223.1 or
LOCATION REQUIREMENTS (INTAKE/EXHAUST)
Intake/Exhaust Installation Requirements (See figure 4):
1.The termination must be 12 inches (30.5 cm) above snow or grade level whichever is higher.
2.Due to normal formation of water vapor in the combustion process, horizontal terminations must not be located over areas of pedestrian or vehicular traffic, i.e. public walkways or over areas where condensate could create a nuisance or hazard. This is especially true in colder climates where ice buildup is likely to occur. A.O. Smith Corporation will not be held liable for any personal injury or property damage due to any dislodging of ice.
3.The minimum distance for any window, gravity air inlet to a building, or from gas or electric meter(s) is 6 feet (1.8 m) horizontally, 4 feet (1.2 m) below and 24 inches (61.0 cm) above.
4.The minimum distance from inside corner formed by two exterior walls is 6 feet (1.8 m) but 10 feet (3.1 m) is recommended where possible.
5.Maintain a minimum distance of 4 feet (1.2 m) from any soffit or eve vent to the exhaust terminal.
6.Maintain a minimum distance of 10 feet (3.1 m) from any forced air inlet to a building. Any fresh air or make up air inlet such as a dryer or furnace area is considered to be a forced air inlet.
7.Avoid areas where condensate drainage may cause problems such as above planters, patios, or adjacent to windows where the steam from the flue gases may cause fogging.
8.Select the point of wall penetration where the minimum 1/4" per foot (2 cm/m) of slope up can be maintained.
9.The through the wall termination kit is suitable for zero clearance to combustible materials.
10.The mid point of the termination elbow must be a minimum of 12 inches (30.5 cm) from the exterior wall.
CAUTION
Direct venting into dead air spaces such as alleys, atriums and inside corners can cause recirculation of flue gases. Recirculation of flue gases will cause sooting, premature failure of the heat exchanger and icing of the combustion air intake during severe cold weather. To prevent the recirculation of flue gases, maintain as much distance as possible between the combustion air intake and the exhaust vent terminal.
Figure 4. Vent Termination Installation Clearances
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