Lochinvar SNA500-125 4Vertical direct venting, Vent/air termination – vertical, Notice

TM

Installation & Service Manual

4Vertical direct venting

Vent/air termination – vertical

￿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 water heaters 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.

Figure 4-1Vertical Termination of Air and Vent

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 17 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. 4-1. The top of the coupling must be at least 1 foot above the air intake. 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.

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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