Lochinvar 51 operation manual Vertical direct venting, Vent/air termination vertical

5Vertical direct venting

Vent/air termination – vertical

Installation & Operation Manual

￿WARNING

￿WARNING

NOTICE

Follow instructions below when determining vent location to avoid possibility of severe personal injury, death or substantial property damage.

Do not connect any other appliance to the vent pipe or multiple boilers to a common vent pipe. Failure to comply could result in severe personal injury, death, or substantial property damage.

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.

￿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

ALTERNATE INTAKE LOCATIONS:

INTAKE PIPES MAY BE LOCATED

ANYWHERE WITHIN 24” OF VENT

PIPE

BIRD SCREEN (TYPICAL)

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 19 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

COUPLING (FIELD SUPPLIED)

VENT OUTLET

12” MINIMUM ABOVE AIR INLET

VENT

6” MINIMUM

ABOVE ROOF /

SNOW LINE

COMBUSTION

AIR

10 horizontal feet.

3. The air piping must terminate in a down-turned 180°

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

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

ALTERNATE INTAKE LOCATIONS: INTAKE PIPES MAY BE LOCATED ANYWHERE WITHIN 24” (610 MM)

OF VENT PIPE

VENT

BIRD SCREEN

(TYPICAL)

in any desired position on the roof, but must always be

no further than 2 feet (.6 m) apart and with the vent

termination at least 1 foot above the air intake.

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.

27