NOTE: For installations requiring both horizontal and vertical runs,
the following rule must be followed: Total number of feet of straight pipe (both horizontally and vertically) must not exceed the allowable length listed in the “Through The Wall” section of the table for total number of elbows used. Also: Total number of vertical feet of straight pipe must not exceed the allowable length listed in the “Through The Roof” section of the table for total number of elbows used. For angular rises in venting, any angle that is greater than or equal to 45° from the horizontal should be considered a vertical rise.
2" (5.1 cm) PVC VENT CONNECTOR LENGTHS FROM INSIDE WALL
| FOR LOW GROUND CLEARANCE INSTALLATIONS | |||||
| Terminating | # of | Maximum | Minimum | ||
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| Elbows | Length | Length | ||
(2) 90° Elbows with Vent Terminal | 0 | 35 ft (10.7 m) | 2 ft (.6 m) |
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(2) 90° Elbows with Vent Terminal | 1 | 30 ft (9.2 m) | 2 ft (.6 m) | |||
(2) 90° Elbows with Vent Terminal | 2 | 25 ft (7.6 m) | 2 ft (.6 m) | |||
(2) 90° Elbows with Vent Terminal | 3 | 20 ft (6.1 m) | 3 ft (.9 m) | |||
(2) 90° Elbows with Vent Terminal | 4 | 15 ft (4.6 m) | 4 ft (1.2 m) | |||
| 3" (7.6 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL | |||||
| FOR LOW GROUND CLEARANCE INSTALLATIONS | |||||
Terminating (Reduce 3" to 2") | # of | Maximum | Minimum | |||
(Reduce 7.6 cm to 5.1 cm) | Elbows | Length | Length | |||
(2) | 90° Elbows with (1) 90° Elbow | 1 | 60 ft (18.3 m) | 10 ft (3 m) | ||
(2) | 90° Elbows with Vent Terminal | 0 | 90 ft (27.5 m) | 10 ft (3.1 m) |
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(2) | 90° Elbows with Vent Terminal | 1 | 85 ft (25.9 m) | 10 ft (3.1 m) | ||
(2) | 90° Elbows with Vent Terminal | 2 | 80 ft (24.4 m) | 10 ft (3.1 m) | ||
(2) | 90° Elbows with Vent Terminal | 3 | 75 ft (22.9 m) | 10 ft (3.1 m) | ||
(2) | 90° Elbows with Vent Terminal | 4 | 70 ft (21.4 m) | 10 ft (3.1 m) | ||
(2) | 90° Elbows with Vent Terminal | 5 | 65 ft (19.8 m) | 12 ft (3.7 m) | ||
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HIGH ALTITUDE INSTALLATIONS FOR ELEVATIONS OVER 2,000 FEET (610 m) ABOVE SEA LEVEL
The capacity of the induced draft blower declines with increasing altitude due to a reduction in the air density. In order to assure safe and reliable performance of the water heater, the following guidelines must be followed. Refer to the venting tables below for maximum distances for the altitudes in your location.
HIGH ALTITUDE VENT CONNECTOR MODIFICATIONS
Altitude above | Maximum venting | Maximum venting |
sea level | length reduction | length reduction |
| tables 7 & 9 | tables 8 & 10 |
0 - 2,000 ft | No reduction in vent | No reduction in vent |
(0 - 610 m) | length required | length required |
over 2,000 - 5,000ft | Reduce maximum vent | No reduction in vent |
(over 610 - 1524 m) | length by 20 ft (6.1 m) | length required |
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over 5,000 - 8,000 ft | Use only 3" (7.6 cm) | No reduction in vent |
(over 1524 - 2439 m) | PVC (Tables 8 & 10) | length required |
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over 8,000 - 10,000 ft | Use only 3" (7.6 cm) | Reduce maximum vent |
(over 2439 - 2540 m) | PVC (Tables 8 & 10) | length by 20 ft (6.1 m) |
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COMBUSTION AIR SUPPL Y
WARNING
Liquefied petroleum gases/propane gas are heavier than air and will remain at floor level if there is a leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets for accumulation of leaking gas. Before lighting, smell all around the appliance area for gas. Be sure to smell next to the floor.
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electrical switch; do not use any telephone in your building.
•Immediately call your gas supplier from a neighbor’s telephone. Follow the gas supplier’s instructions.
•If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE APPLIANCE UNTIL LEAKAGE IS CORRECTED!
IMPORTANT
The flow of combustion and ventilating air must not be obstructed.
Provide adequate air for combustion and ventilation. An insufficient supply of air will cause recirculation of combustion products resulting in air contamination that may be hazardous to life. Such a condition often will result in a yellow, luminous burner flame, causing carbon build up or sooting of the combustion chamber, burners, and flue tubes with possible damage to the heater.
When an exhaust fan is installed in the same room with a heater, sufficient openings for air must be provided in the walls. Undersized openings will cause air to be drawn into the room through the chimney, causing recirculation of combustion products.
Unconfined Spaces
In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation, and dilution of flue gases. However, in buildings of tight construction (for example, weather stripping, heavily insulated, caulked, vapor barrier, etc.), additional air may need to be provided using the methods described under CONFINED SPACES: All Air From Outdoors or Specially Engineered Installations.
Confined Spaces
Confined spaces are spaces defined as having less than 50 ft.3/1000 BTU
(1.4 m3/0.29 kw-hr).
All Air From Inside the Building: The confined space must be provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment installed in the combined space must be considered in making this determination. Each opening must have a minimum free area of 1 square inch per 1000 BTU (6.5 cm2/0.29 kw) per hour of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches (645 cm2). One opening must be within 12 inches (31 cm) of the top and one within 12 inches (31 cm) of the bottom of the enclosure.
All Air From Outdoors: The confined space must be provided with two permanent openings, one commencing within 12 inches (31 cm) of the top and one commencing within 12 inches (31 cm) from the bottom of the enclosure. The openings must communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.
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