Lennox Hearth LSO-43 Offset Elbow Assembly, Return Elbow Assembly, Gas Line Connection

Note: See Framing and Dimension Chart for the sizes of the ceiling and roof openings. The size of the roof opening varies with the degree of pitch of the roof.

Offset Elbow Assembly

Offset elbows install the same as chimney sections. First, snap the inner section INTO the preceding inner section of flue. Check connec- tion by pulling up slightly to ensure a tight fit. Next, the outer sections snap lock OVER the preceding outer section of chimney. Again, check outer section by pulling up slightly to ensure proper connection is made.

Return Elbow Assembly

Return elbows install the same way as round terminations and stabilizers:

Step 1. Hold return elbow over top of last chimney section.

Step 2. Center inner slip section into inner flue pipe-slip down.

Step 3. Center outer-locking section over outer chimney pipe. Push down until locking joint has firmly engaged.

OPTIONAL EQUIPMENT

CONSIDERATIONS

Gas Line Connection

Always plumb gas line installation per local codes. Check all connections with soap suds; leaks will bubble. Never test any gas line con- nection with a match or open flame.

This provision is intended for connection to a decorative gas appliance incorporating an au- tomatic shut-off device and complying with the Standard for Decorative Gas Appliances for installation in vented fireplaces, ANSI Z21.60 (1991) or American Gas Association draft re- quirements for Gas-Fired Log Lighters for Wood Burning Fireplaces, Draft No. 4 dated August, 1993. Install in accordance with the National Fuel Gas Code, ANSI Z223.1. This complies with the revised U.L. 127 standard.

WARNING:THISFIREPLACEHASNOTBEEN TESTED WITH AN UNVENTED GAS LOG SET. TO REDUCE THE RISK OF FIRE OR INJURY, DO NOT INSTALL AN UNVENTED GAS LOG SET INTO THIS FIREPLACE.

If you’re installing a gas line, connect it before the fireplace is framed and enclosed in the

CAUTION: CERTAIN GLASS DOORS OVER- LAP THE BLACK METAL FACING OF THE FIRE- PLACE. IF THE FIREPLACE HAS BEEN FACED WITH NONCOMBUSTIBLE MATERIALS, THERE MIGHT NOT BE SUFFICIENT CLEAR- ANCE TO INSTALL THE GLASS DOORS OF YOUR CHOICE. ENSURE ADEQUATE CLEAR- ANCE IS MAINTAINED AT ALL TIMES SO AS NOT TO INTERFERE WITH THE INSTALLA- TION AND OPERATION OF GLASS DOORS.

FIREPLACE FINISHES

Mantels and Trim

In Canada, the minimum height for a combus- tible mantel is 18" (457 mm) above the fireplace opening. Figure 39 shows typical Canadian installations. For installations other than Canada, combustible mantels and trim may either project in front or be flush with the finished wall as per NFPA 211 section 7-2.3.3. and Figure 40. If a mantel is of a noncombustible material, it is exempt from these requirements as long as it does not interfere with the installation or opera- tion of glass doors.

Note: Do not place any combustible materials on the fireplace face.

Step 4. Pull up slightly on return elbow to ensure locking joint has firmly engaged.

Step 5. Secure support straps to framing members by nailing under tension in sheer (Figure 38 ).

finished wall. The gas knockout is determined by the indentation located at the bottom and slightly off center in the side refractories. THE

KNOCKOUT IS ALWAYS REMOVED FROM IN- SIDE THE FIREPLACE. DO NOT REMOVE THE KNOCKOUT UNLESS YOU ARE INSTALLING A GAS LINE. If removal is attempted from the outer wrapper, side refractory damage may occur. With a medium-sized hammer, lightly tap the surface of the indentation. The refrac- tory material is very thin in this area and is easily removed. Once a small hole has been made,

8" Max.

(203mm)

Combustible

Mantel

18" Min.

(457mm)

Finished

Wall

Header

Spacer

Noncombustible Wall Covering

Return

Elbow

Figure 38

Note: The return elbow assembly performs the same function as a stabilizer. Consider this when determining the need for a stabilizer.

Note: Do not apply excessive pressure to any subsequent chimney section following return elbow assembly when installing. Ensure that each subsequent chimney section is securely attached by testing as noted above.

continue tapping until you have reached suffi- cient diameter for the gas line to fit through. The entire knockout does not have to be removed. Remove insulation in the gas line channel.

IMPORTANT: REPACK INSULATION MATERIAL IN SQUARE HOLE AROUND GAS LINE, INTE- RIOR AND EXTERIOR OF FIREPLACE, TO SEAL.

Glass Doors

If glass doors are to be installed on these fireplaces, refer to specific installation instruc- tions packed with the glass doors. Use only the doors that are listed for use with these fire- places. Use of other non-listed glass door on these fireplaces may constitute a potential fire hazard and is not recommended.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Fireplace Opening

Canadian Installation

Figure 39

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