VENTING

Vent sizing, installation and termination should be in accordance with this installation manual. This boiler must be vented using PVC/CPVC or Stainless Steel materials.

All electrical power and gas must be turned off prior to any installation of the venting system.

VENT INSTALLATION CONSIDERATIONS

This boiler is a category IV appliance that can be vented using room air for intake combustion air, or direct vented so that all intake air for combustion comes from the outside through a sealed pipe. When installing this appliance as direct vent, special vent kits are required.

In cold climates any water vapor remaining in the flue gases will condense into a cloud of vapor at the point where the vent system exits the building. Special consideration is recommended, before locating the vent termination near walkways, windows and building entrances.

Direct venting into dead 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. Due to large volumes of flue gases, multiple boiler applications also require additional distance between the intake and the exhaust terminals.

This boiler can be vented with PVC/CPVC or an UL approved AL 29-4C Stainless Steel venting material which are explained in the following pages.

PVC/CPVC INSTALLATION:

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.

Refer to Table 13 on Page 36 for PVC/CPVC piping materials.

All PVC vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of a 1/4 inch per foot back to the boiler (to allow drainage of condensate).

This appliance requires a special venting system. Use only the vent materials, primer, and cement specified in this manual to make the vent connections. Failure to follow this warning could result in fire, personal injury, or death.

Note: Make sure that for PVC venting installation, the first 10 feet of vent must be CPVC or stainless steel and the set point temperature of the boiler must not exceed 200 °F.

STAINLESS STEEL INSTALLATION:

Installations must comply with applicable national, state, and local codes. Stainless steel vent systems must be listed as a UL- 1738 approved system for the United States and a ULC-S636 approved system for Canada.

Installation of the approved AL 29-4C stainless steel venting material should adhere to the stainless steel vent manufacturer’s installation instructions supplied with the vent system.

Refer to Table 14 and Table 15 on Page 36 for air intake and vent pipe sizes.

AIR INTAKE/VENT CONNECTIONS

1.Air Intake Adapter: Provides an inlet for combustion air directly to the unit from outdoors.

2.Vent Outlet: Provides an outlet for combustion gases to outdoors.

VENTING SYSTEM

This boiler may be installed in six separate orientations depending on the require­ments of the building and the appliance. The installer must decide which method is most appro­priate for each installation. These orientations are:

1.Vertical Termination - vertical vent termi­nation­ through un-enclosed or en­closed areas with roof penetration, see Figure 25 on Page 28.

2.Through-the-Wall Termination (TWT) - horizontal­ vent termination directly through an outside wall, see Figure 26 on Page 28.

3.Horizontal Direct Vent - using TWT to exhaust flue products­ and PVC piping to bring combus­tion air to the boiler from the outside. See Figure 27 on Page 29 and Figure 30 on Page 30.

4.Vertical Direct Vent - using a vertical vent termination to exhaust flue products and PVC piping to bring combustion air to the boiler from outside, see Figure 28 on Page 29 and Figure 29 on Page 30.

GENERAL VENT INSTALLATION PROCEDURE

Prior to beginning the installation of the vent system, determine­ and obtain all parts required­ for the installa­tion. Proper operation of the boiler and venting­ system is depen­ dent upon use of all speci­fied parts and installation­ techniques;­ both safety and proper performance­ of the system may suffer if instructions­ are not followed.

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A.O. Smith 2600, 3400, 1700, 2000 instruction manual Venting
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3400, 1700, 2000, 2600 specifications

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