Lochinvar 151 Vertical direct venting, Vent/air termination – vertical, Determine location

5 Vertical direct venting

Vent/air termination – vertical

￿WARNING Follow instructions below when determining vent location to avoid

possibility of severe personal injury, death or substantial property damage.

￿WARNING Do not connect any other appliance to the vent pipe or multiple water heaters to

a common vent pipe. Failure to comply could result in severe personal injury, death, or substantial property damage.

NOTICE	Installation must comply with local
	requirements and with the National
	Fuel Gas Code, ANSI Z223.1 for U.S.
	installations or CSA B149.1 for Canadian
	installations.
Determine location

Locate the vent/air terminations using the following guidelines:

1.The total length of piping for vent or air must not exceed the limits given in the General Venting Section on page 22 of this manual.

2.The vent must terminate at least 3 feet above the highest place in which the vent penetrates the roof and at least 2 feet above any part of a building within 10 horizontal feet.

3.The air piping must terminate in a down-turned 180° return pipe no further than 2 feet from the center of the vent pipe. This placement avoids recirculation of flue products into the combustion air stream.

4.The vent piping must terminate in an up-turned coupling as shown in FIG. 5-1A. The top of the coupling must be at least 1 foot above the air intake. When the vent termination uses a rain cap as illustrated in FIG. 5-1B maintain at least 36" (914 mm) above the air inlet. The air inlet pipe and vent pipe can be located in any desired position on the roof, but must always be no further than 2 feet apart and with the vent termination at least 1 foot above the air intake.

Installation & Operation Manual

￿WARNING Rooftop vent and air inlet terminations must terminate in the same pressure zone, unless vertical vent sidewall air is set up as shown in the General Venting - Vertical Vent, Sidewall Air Section.

Figure 5-1APVC/CPVC Vertical Termination of Air and Vent

Figure 5-1BStainless Steel Vertical Termination of Air and Vent

ALTERNATE INTAKE LOCATIONS:

INTAKE PIPES MAY BE LOCATED

ANYWHERE WITHIN 24” (610 MM)

OF VENT PIPE

VENT	BIRD SCREEN
	(TYPICAL)

6" (152 MM) MINIMUM

ABOVE ROOF /

SNOW LINE

COM,BUSTION

AIR

VENT OUTLET

36” (914 MM) MINIMUM

ABOVE AIR INLET

5.Locate terminations so they are not likely to be damaged by foreign objects, such as stones or balls, or subject to buildup of leaves or sediment.

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