Lennox Hearth T300P operation manual Installation, Venting Requirements

INSTALLATION

VENTING REQUIREMENTS

It is recommended that only an authorized dealer install your pellet stove. The specified installation requirements must be followed to ensure conformity with both the safety listing of the appliance and local building codes. All clearances, installation instructions and precautions specified by the vent manufacturer must be followed.

Selecting a Location - Review the appliance clearance requirements before installing the venting system (see Clearances, page 6). Position the appliance far enough away from walls to allow adequate room for servicing. Choose the appliance location with the least amount of interference with the house framing, plumbing, wiring, etc.

Preferred Vent Configuration – For the best perform- ance, we recommend a vent run design which runs verti- cally and terminates above the roofline. This design will allow natural draft to improve the flow of flue gases and will aid in combustion and stove performance.

Type of Pipe – This stove requires type “PL” (pellet vent pipe, sometimes referred to as “L-Vent pellet vent”), which conforms to UL standard 641. Connect the pellet vent pipe or the “tee” to the flue collar using a minimum of three screws and seal as specified in “Pipe Joint Re- quirements” on this page. Do not use class B gas chimney or single wall chimney as a substitute.

Size of Pipe -These pellet appliances are approved for use with the following vent sizes: 3” (75mm) standard, or 4” (100mm). See page 12 for determining correct size vent to use. Use a 3” (75mm) to 4” (100mm) adapter (Cat. No. 14M81) or a 3” (75mm) to 4” (100mm) “tee” in order to run 4” (100mm) pipe.

Offsets - In every installation, a single or double clean- out “tee” is recommended for every ninety-degree offset (this tee will help collect ash residue and will allow for routine cleaning without the need to disconnect sections of pipe).

Note: Offsets and horizontal runs accumulate fly ash and soot which reduces the exhaust flow and performance of the stove.

Total Offsets in venting system should not exceed 270° total in direction change.

Horizontal Runs - The maximum total horizontal run must not exceed 10 feet (3.1 meters).

Horizontal run of pipe requires 1/4” / 7 mm rise per foot.

Pipe Clearances / Requirements – See pipe manufac- turers instructions for installation of venting components and clearances. Follow pipe manufacturers installation precautions for passing pipe through a combustible wall or ceiling (i.e. use an approved thimble).

Notes:

All pellet vent pipe requires 3” (75mm) clearance from outside of pipe unless otherwise specified by vent manu- facturer.

A support bracket should be installed every 4’ (1.2m) of pellet vent pipe on the exterior wall of the house unless otherwise specified by vent manufacturer.

Pipe / Liner Joint Requirements - All pipe joints must be secured with a minimum of 3 screws. ALL horizontal joints must be sealed gas tight. Use RTV silicone with a rating of at least 570° F (969° C), or Interam to provide a complete seal at the flue collar and on all joints.

Connection to Masonry Chimney through a Wall - Be sure to verify the construction of a masonry chimney, as it may have combustible framing.

The use of single wall flex or rigid 24 gage stainless steel pipe as a liner is approved.

Connection to an Existing Class A Chimney - A chim- ney adapter can be used to make the connection from 3”

/75mm or 4” / 100mm pellet vent pipe to existing UL chimney system. Verify with the pipe manufacturer that your pipe brands will interconnect. The use of single wall flex or rigid pipe (24 gage stainless steel) as a liner is approved.

Direct-Vent Installations (Horizontal): On all direct-vent installations (short, horizontal runs with no vertical pipe); care should be taken when choosing a location for termi- nating the vent. It is not recommended to directly vent the exhaust on the prevailing wind side of the house. It is recommended that when an appliance is vented directly through a wall, a minimum of 8’ (2.5M) of vertical pipe should be installed to create some natural draft. This will reduce the possibility of smoke or odor entering the dwelling during appliance shutdown or loss of power.

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