AIR Inlet Pipe Materials

Make sure the air inlet pipe(s) are sealed. The acceptable air inlet pipe materials are:

•PVC/CPVC

•AL 29-4C

An adapter is provided for transition between the air inlet connection on the boiler and the plastic air inlet pipe.

Seal all joints and seams of the air inlet pipe using either Aluminum Foil Duct Tape meeting UL Standard 723 or 181A-P or a high quality UL Listed silicone sealant. Do not install seams of vent pipe on the bottom of horizontal runs.

Secure all joints with a minimum of 3 sheet metal screws or pop rivets. Apply Aluminum Foil Duct Tape or silicone sealant to all screws or rivets installed in the vent pipe.

Make sure that the air inlet pipes are properly supported.

The PVC/ CPVC air inlet pipe must be cleaned and sealed with the pipe manufacturer’s recommended solvents and standard commercial pipe cement for the material used. The PVC, CPVC, air inlet pipe should use a silicone sealant to ensure a proper seal at the boiler connection and the air intake adapter connection. Proper sealing of the air inlet pipe ensures that combustion air will be free of contaminants and supplied in proper volume.

VENT AND AIR PIPE INSTALLATION

1.Measure from the boiler level to vent. Refer to the Table 14 on Page 36 for the allowable lengths.

2.Prepare pipes to the required lengths and deburr the inside and outside of the pipe ends. Chamfer outside the pipe end to ensure even cement distribution when joining.

3.Clean all pipe ends and fittings using a clean dry rag. (Moisture will retard curing and dirt or grease will prevent adhesion.)

4.Dry fit vent or air piping to ensure proper fit before assembling any joint. The pipe should go a third to two-thirds into the fitting to ensure proper sealing after cement is applied.

5.Priming and Cementing:

•Handle pipes and fittings carefully to prevent contamination of surfaces.

•Apply an even coat of primer to the fitting socket.

•Apply an even coat of primer to the pipe end to approximately 1/2" beyond the socket depth.

•Apply a second primer coat to the fitting socket.

•While primer is still wet, apply an even coat of approved cement to the pipe equal to the depth of the fitting socket.

•While primer is still wet, apply an even coat of approved cement to the fitting socket.

•Apply a second coat of cement to the pipe.

•While the cement is still wet, insert the pipe into the fitting, if possible twist the pipe a 1/4 turn as you insert it.

Note: If voids are present, sufficient cement was not applied and joint could be defective.

•Clear excess cement from the joint removing ring or beads as it will needlessly soften the pipe.

When a sidewall or vertical rooftop combustion air supply system is disconnected for any reason, the air inlet pipe must be resealed to ensure that combustion air will be free of contaminants and supplied in proper volume.

Failure to properly seal all joints and seams may result in flue gas recirculation, spillage of flue products and carbon monoxide emissions causing severe personal injury or death.

Figure 22. PVC/CPVC VENTING WITH ADAPTER

REQUIREMENTS FOR INSTALLATION IN CANADA

1.Installations must be made with a vent pipe system certified to ULC-S636. IPEX is an approved vent manufacturer in Canada supplying vent material listed to ULC-S636.

2.The initial 3 feet of plastic vent pipe from the appliance flue outlet must be readily accessible for visual inspection.

3.The components of the certified vent system must not be interchanged with other vent systems or unlisted pipe/ fittings.

Figure 23. PVC/CPVC VENTING - HORIZONTAL

3400, 1700, 2000, 2600 specifications

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A.O. Smith 1700, 3400, 2600, 2000 AIR Inlet Pipe Materials, Vent and AIR Pipe Installation

Models: 3400 1700 2000 2600