Lochinvar 400, 801 operation manual Air inlet pipe materials, Stainless steel vent

3 General venting (continued)

Air inlet pipe materials:

The air inlet pipe(s) must be sealed. Choose acceptable combustion air inlet pipe materials from the following list:

PVC, CPVC or ABS

Dryer Vent or Sealed Flexible Duct (not recommended for rooftop air inlet)

Galvanized steel vent pipe with joints and seams sealed as specified in this section.

Type “B” double-wall vent with joints and seams sealed as specified in this section.

AL29-4C, stainless steel material to be sealed to specification of its manufacturer.

*Plastic pipe may require an adapter (not provided) to transition between the air inlet connection on the appliance

Installation & Operation Manual

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.

￿ DANGER	Failure to properly seal all joints and seams
	as required in the air inlet piping may
	result in flue gas recirculation, spillage
	of flue products and carbon monoxide
	emissions causing severe personal injury
	or death.

Stainless steel vent

This product has been approved for use with stainless steel using the manufacturers listed in Table 3A.

and the plastic air inlet pipe.

￿WARNING

Use only the materials, vent systems, and terminations listed in Table 3B.

￿WARNING

Using vent or air intake materials other than those specified, failure to properly seal all seams and joints or failure to follow vent pipe manufacturer’s instructions can result in personal injury, death or property damage. Mixing of venting materials will void the warranty and certification of the appliance.

DO NOT mix vent systems of different types or manufacturers, unless listed in this manual. Failure to comply could result in severe personal injury, death, or substantial property damage.

NOTICE	Installations must comply with applicable
	national, state, and local codes. Stainless
	steel vent systems must be listed as a

NOTICE	The use of double-wall vent or insulated
	material for the combustion air inlet pipe is
	recommended in cold climates to prevent
	the condensation of airborne moisture in
	the incoming combustion air.

Sealing of Type “B” double-wall vent material or galvanized vent pipe material used for air inlet piping on a sidewall or vertical rooftop Combustion Air Supply System:

a.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 such as those manufactured by Dow Corning or General Electric.

b.Do not install seams of vent pipe on the bottom of horizontal runs.

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

d.Ensure that the air inlet pipes are properly supported.

The PVC, CPVC, or ABS air inlet pipe should be cleaned and sealed with the pipe manufacturer’s recommended solvents and standard commercial pipe cement for the material used. The PVC, CPVC, ABS, Dryer Vent or Flex Duct air inlet pipe should use a silicone sealant to ensure a proper seal at the appliance connection and the air inlet cap connection. Dryer vent or flex duct should use a screw type clamp to seal the vent to the appliance air inlet and the air inlet cap. Proper sealing of the air inlet pipe ensures that combustion air will be free of contaminants and supplied in proper volume.

	UL-1738 approved system for the United
	States and a ULC-S636 approved system
	for Canada.
	Installation of a stainless steel vent system
NOTICE
	should adhere to the stainless steel vent
	manufacturer’s installation instructions
	supplied with the vent system.
	The installer must use a specific vent starter
NOTICE
	adapter at the flue collar connection,
	supplied by the vent manufacturer to
	adapt to its vent system. See Table 3B for
	approved vent adapters. Discard CPVC
	starter piece.

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