Lennox Hearth LBC-3824 User Manual

INSTALLATION
INSTRUCTIONS

ELITE SERIES

38" & 43" Wood-Burning Fireplaces

P/N 850003M Rev. H 10/2011

MODELS

LBR-3824 LBC-3824
LBR-3824-H LBC-3824-H
LBR-4324 LBC-4324
LBR-4324-H LBC-4324-H

This installation manual will enable you to obtain a safe, efficient and
dependable installation of your fireplace system. Please read and
understand these instructions before beginning your installation.

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

Do not alter or modify the fireplace or its components under any
circumstances. Any modification or alteration of the fireplace system,
including but not limited to the fireplace, chimney components and
accessories, may void the warranty, listings and approvals of this system
and could result in an unsafe and potentially dangerous installation.

IMPORTANT! TO ASSURE PROPER ALIGNMENT OF GLASS DOORS:
INSTALL THIS FIREPLACE IN A SQUARE AND PLUMB CONDITION,
USING SHIMS AS NECESSARY AT SIDES AND/OR BOTTOM.

WH Report No. 629-915173A

TABLE OF CONTENTS

Safety Rules .................................... page 2

Tools and Building Supplies ............ page 2

Precautions ..................................... page 3

Introduction..................................... page 3

Clearances/Height Requirements..... page 3

Chimney System ............................. page 3

Assembly Outline............................. page 4

Location of Fireplace ....................... page 4

Assembly Steps............................... page 5

Preinstallation Notes........................ page 5

Clearances ....................................... page 5

Installing the Fireplace..................... page 5

Fireplace Specifications .................. page 6

Framing Specifications.................... page 7

Installing the Chimney System ........ page 8

30° Offset through Floor/Ceiling ...... page 9

Ten Foot Rule Summary .................. page 11

Multiple Terminations...................... page 11

Chimney Component Calculations ... page 11

Special Offset Instructions............... page 12

Offset Calculations........................... page 12

Vertical Elevation Chart................... page 13

Offset Elevation Chart ..................... page 14

Installing Offsets.............................. page 14

Combustion Air Kits ........................ page 15

Optional Equipment Considerations. page 15

Gas Line Connection........................ page 15

Vent Free Appliances ....................... page 16

Glass Doors..................................... page 16

Cold Climate Insulation.................... page 16

Fireplace Finishes ............................ page 16

Mantels and Trim............................. page 16

Hearth Extensions/Wall Shields ....... page 16

Finish Requirements........................ page 18

Installation Components.................. page 19

IMPORTANT: PLEASE READ AND
UNDERSTAND THESE RULES TO
FOLLOW FOR SAFETY.

1. Before starting your fireplace installation,

read these installation instructions carefully to
be sure you understand them completely and in
entirety. Failure to follow them could cause a
fireplace malfunction resulting in serious injury
and/or property damage.

2. Always check your local building codes. The
installation must comply with all local, regional,
state and national codes and regulations.

3. These fireplaces must be installed with
Security Chimneys FTF10 [10" (254mm) in­side diameter] Chimney System only. These
systems are intended for use in any applica­tion where a traditional masonry type fireplace
would apply. The chimney system must al­ways vent to the outside of the building.

4. To ensure a safe fireplace system and to
prevent the build-up of soot and creosote,
inspect and clean the fireplace and chimney
prior to use and periodically during the heating
season.

5. Use solid fuel only. DO NOT use artificial
wax based logs, chemical chimney cleaners or
flame colorants in your fireplace.

6. DO NOT use charcoal or coal under any
circumstances.

7. NEVER use gasoline, gasoline-type lantern
fuel, kerosene, charcoal lighter fluid, or similar
liquids to start or “freshen up” a fire in this
fireplace. Keep any flammable liquids at safe
distance from the fireplace.

8. NEVER leave children unattended when
there is a fire burning in the fireplace.

9. Always keep flue damper open when heat is
present in the fireplace.

10. Before servicing, allow the fireplace to
cool. Always shut off any electricity or gas to
the fireplace while working on it. This will
prevent any possible electrical shock or burns.

11. This fireplace is not intended to heat an
entire home or be used as a primary heat
source. It is designed to ensure homeowner
comfort by providing supplemental heat to the
room.

12. Always ensure that an adequate supply of
replacement combustion air from the outside
of the house is accessible to the fire to support
normal combustion. Fireplaces consume large
volumes of air during the normal combustion
process. In the event the home is tightly sealed
with modern energy efficient features, the op­tional combustion air kit may not provide all the
air required to support combustion.

The manufacturer is not responsible for any
smoking or related problems that may result
from the lack of adequate combustion air. It is
the responsibility of the builder/contractor to
ensure that adequate combustion air has been
provided for the fireplace.

13. DO NOT use a fireplace insert or any other
products not specified herein by the manufac­turer for use with this fireplace. All gas log sets
must be operated with the damper clamped
open, including unlisted “vent free” log sets.
Listed “vent-free” log sets may be operated
with the damper closed.

14. "Smoke free” operation is not warranteed
nor are we responsible for inadequate system
draft caused by mechanical systems, general
construction conditions, inadequate chimney
heights, adverse wind conditions and/or un­usual environmental factors or conditions be­yond our control.

15. Never, under any circumstances, install a
fireplace, chimney component or any acces­sories, that has visible or suspected physical
damage as a result of handling or transporta­tion. These items should be inspected by your
distributor or qualified factory representative
to ensure safe condition. When in doubt, con­sult your distributor.

16. For additional safety considerations and
complete operating instructions, refer to the
Care and Operation Manual provided with the
fireplace.

TOOLS AND BUILDING SUPPLIES
NORMALLY REQUIRED

Tools should Include:

Phillips screwdriver
Hammer
Saw and/or sabersaw
Level
Measuring tape
Plumb line
Electric drill and bits
Pliers
Square

Building supplies:

Framing materials
Wall finishing materials
Caulking materials (noncombustible)
Fireplace surround and hearth
extension materials (noncombustible)

2

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

PRECAUTIONS

Note: These fireplace systems are not difficult

to install. However, in the interest of safety, it is
recommended that the installer be a qualified or
certified “tradesman” familiar with commonly
accepted fireplace installation and safety tech­niques as well as prevailing local codes.

The most important areas of concern dealing
with the installation of factory-built fireplaces
are clearances to combustible materials, proper
assembly of component parts, height of the
chimney system, the proper use of accessories
supplied by the manufacturer and the tech­niques employed in using finishing materials
applied to the wall surrounding the fireplace,
hearth extensions and wall shields. Each of
these topics will be covered in thorough detail
throughout this manual. Please give each your
special attention as you progress with your
installation.

INTRODUCTION
General Information

The LBR Series fireplace is a traditional wood
burning radiant heat system. The LBC Series
fireplace is a traditional wood burning heat
circulating system. These fireplaces come with
standard bar grates, optional outside combus­tion air kits and optional decorative glass doors.

TYPICAL INSTALLATION

Note: Illustrations shown reflect “typical” instal-

lations with nominal dimensions and are for
design and framing reference only. Actual instal­lations may vary due to individual design prefer­ences. However, always maintain minimum clear­ances to combustible materials and do not vio­late any specific installation requirements.

These fireplaces have been tested and listed by
Warnock Hersey (Report No. 629-915173A)
to U.L. standard 127 for US and ULC S610 for
Canada. These units are intended for installa­tion in residential homes and other buildings
of conventional construction including com­mercial, not in mobile homes.

These fireplace systems are designed for in­stallation in accordance with the National Fire
Protection Standard for chimneys, fireplaces
and solid fuel burning appliances; NFPA 211
and in accordance with codes such as the
BOCA Basic/National Codes, the Standard Me­chanical Code and the Uniform Building Codes.

WARNING: FAILURE TO USE MANUFAC­TURE PROVIDED PARTS, VARIATIONS IN
TECHNIQUES AND CONSTRUCTION MA­TERIALS OR PRACTICES OTHER THAN
THOSE DESCRIBED IN THIS MANUAL
MAY CREATE A FIRE HAZARD AND VOID
THE LIMITED WARRANTY.

IMPORTANT: WHEN INSTALLING THESE
FIREPLACES IN CANADA, THE CHIMNEY
COLLAR ENCLOSURE KIT, MODEL CCEK,
MUST BE INSTALLED.

When complete these fireplace systems con­sists of four basic “sub-systems”:

1. The Fireplace

2. The Chimney and Termination

3. Optional Louver Kits and Glass Doors

4. Optional Combustion Air Kit

5. Optional Cold Climate Kit (Mandatory in

Canada).

CLEARANCES AND HEIGHT
REQUIREMENTS

The fireplace may be placed on or near normal
construction materials*. The combustion air
kit, firestop spacer and roof flashing (not chase
flashings) may be placed directly on or against
normal construction materials.* The chimney
requires a minimum 2" air space to combus­tibles and the fireplace outer wrapper requires
a minimum 1/2" air space to combustibles. A
combustible mantle may be installed 12" above
the opening of the fireplace as per NFPA 211,
Section 7-2.3.3. In Canada, the minimum is
18" (441mm) above the fireplace opening.

The minimum installed height of the completed
fireplace system is 14' 0". The maximum height
is 80' 0".

Figure 1

38/43 LBR Series Shown

Chimney and
Termination

Chimney Air Kit
(Canada Only)

The fireplace and chimney system must be
enclosed when installed in or passing through
a living area where combustibles or people may
come in contact with it. This is important to
prevent possible personal injury or fire hazard.

For questions, please call your distributor or
the manufacturer. Special restrictions apply to
the front and facing of the fireplace and nearby
walls (See pages 16 and 17 ).

CHIMNEY SYSTEM

These fireplaces are designed and code listed
for use with Security Chimneys FTF10 chim­ney System only. Always use Security Chim­neys FTF10 chimney components with these
fireplaces. Do not modify or alter these com­ponents as this may cause a potential seri­ous hazard and void the Warranty.

*Construction Materials:

• framing materials • paneling

• particle board • flooring

• dry wall • etc.

• plywood

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

3

Insulate Joists
Same As Ceiling

Draft Stops

F10FS-2
Firestop

FTF10-CT2
Termination

Note: Non­Combustible
Chase
Flashing
must be
Used to
Cover
Chase
Opening

Insulation
(Thermal Barrier)

19"

(483mm)

8'

(2.4m)

Level

19"

(483mm)

Optional
Insulation
in Outside
Walls of
Chase

Solid
Continuous
Surface

Outside
Base

Figure 2

WARNING: IF INSULATION IS USED, THE
FIREPLACE MUST NOT BE PLACED DI­RECTLY AGAINST IT. INSULATION OR
VAPOR BARRIERS, IF USED, MUST FIRST
BE COVERED WITH GYPSUM BOARD,
PLYWOOD, PARTICLE BOARD OR OTHER
MATERIAL TO ASSURE INSULATION AND
VAPOR BARRIERS REMAIN IN PLACE.

Chimney Height

The total height of your completed fireplace
system from the surface the fireplace rests on
to the chimney top must not exceed 80 ft
(24.4 m) and must also meet minimum height
requirements. Refer to the minimum system
height chart, below.

MINIMUM SYSTEM HEIGHT

Security FTF10 Pipe

Vertical Installation 14 ft (4.3 m)

One Offset

Two Offsets

16 ft (4.9 m)

24 ft (7.3 m)

Chase Enclosure

A chase is a vertical box-like structure con­structed to surround the fireplace and chimney.
Refer to

for a typical chase configura-

Figure 2

tion. As with all chimney installations, avoid
overhead obstructions such as trees, power
lines, etc. A chase should be constructed and
insulated just like any outside wall. In a cold
climate, we recommend the base of the chase
should also be insulated between the solid
continuous floor beneath the fireplace and the
chase bottom. Chase insulation in a cold cli­mate installation is not required for safety.

ASSEMBLY OUTLINE
Before You Start

Check the inventory list to be sure you have all
necessary parts in good usable condition. Also
check for any concealed damage.

Check the operation of the damper. The dam­per is controlled through the use of a damper
rod inside the top center of the firebox open­ing, behind the lintel (Figure 3).

• To CLOSE the damper, PUSH the damper rod
UP and BACK (toward the rear of the fire-

place), until locked in position.

• To OPEN the damper, PULL the damper rod
FORWARD (toward the front of the fireplace)
and DOWN, until locked in position.

LOCATION OF FIREPLACE

Carefully select the proper location for heat
circulation, aesthetics, chimney obstructions
and clearance to side wall(s). With proper pre­planning, a slight adjustment of a few inches
can save considerable time and expense later
during construction and assembly.

Hearth

Hearth

Optional
Outside Chase

Figure 4

Carefully consider the position of the fireplace
opening with respect to the location of adja­cent or nearby stairwells, bath or kitchen ex­haust fans and/or return air registers for forced
air furnaces/air conditioners that could cause
a smoking fireplace condition if the house is
tightly insulated.

When locating the fireplace, consideration must
be given to combustibles and final finishing.
See

Figure 5

combustible finish materials to the “Safe Zone.”

and confine the final location of

WARNING: DO NOT PACK OR FILL RE­QUIRED AIR SPACES WITH INSULATION
OR OTHER MATERIAL. NO MATERIAL IS
ALLOWED IN THESE AREAS.

Note: Do not insulate the chase cavity with

blown or fill type insulation materials.

Note: Local codes may not require firestopping
at the ceiling levels for outside chase installa­tions. However, it is recommended for safety
and the reduction of heat loss.

4

Damper Rod

Damper
CLOSED

To CLOSE damper, PUSH damper rod UP
and BACK (toward rear of fireplace).

To OPEN damper, PULL damper rod DOWN
and FORWARD (toward front of fireplace).

Figure 3

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Lintel

~

Damper
OPEN

Combustion Air Actuator

Metal Safety Strip

Floor

1/2" (13mm)

Maintain
1/2" (13mm)
Air Space
at Sides
and Back

Combustible
Wall

Platform

Hearth
Extension

18”

45°

Black Portion Of Frame

Not To Be Covered With

Combustible Materials

1”

Door

Opening

Safe

18”

Zone

Wall
Covering

Be sure fireplace rests on a solid continuous
floor or platform with appropriate framing for
support and so that no cold air can enter the
room from under the fireplace.

The fireplace may be positioned and then the
framing built around it, or the framing may be
constructed and the fireplace positioned into
the opening.

Usually, no special floor support is needed for
the fireplace, however, to be certain:

INSTALLING THE FIREPLACE

Step 1. Slide the fireplace into prepared fram-

ing or position fireplace in its final position and
frame later.

The fireplace may not be recessed into a com­bustible floor. Maintain the floor to hearth
clearance established by the fireplace lower
front face.

Figure 5

DO NOT permanently place furniture or other
items such as decorative pillows within 60" of
the fireplace front face.

ASSEMBLY STEPS

Note: The following steps represent the normal

sequence of installation. Each installation is
unique, however, and might require a different
sequence.

1. Position firebox prior to framing or into
prepared framing.

2. Install the chimney system.

3. Install optional outside combustion air kit.

4. Plumb gas line if a decorative gas appliance

will be used. (Gas connections should only be
performed by an experienced, licensed/certi­fied tradesman.)

5. Complete the installation, finish wall mate­rial, surround and hearth extension to your
individual taste.

6. Assemble and attach optional glass door
assembly.

Study the three dimensional illustration (

ure 1

) to get a general idea of each element of

Fig-

your fireplace system.

PRE-INSTALLATION NOTES

The fireplace may be installed directly on a
combustible floor or raised on a platform of an
appropriate height. Do not place fireplace on
carpeting, vinyl or other soft floor coverings. It
may, however, be placed on flat wood, ply­wood, particle board or other hard surfaces.

1. Estimate the total weight of the fireplace

system including chimney and surround ma­terials such as brick, stone, etc., to be in­stalled. Shipping weights for the fireplace may
be found on page 18.

2. Measure the square footage of the floor

space to be occupied by the system, surrounds
and hearth extensions.

3. Note the floor construction, i.e. 2 x 6’s, 2 x 8’s

or 2 x 10’s, single or double joists, type and
thickness of floor boards.

4. Use this information and consult your local

building code to determine if you need addi­tional support.

CAUTION: DO NOT BLOCK THE HEAT-CIRCU­LATING AIR INLET AND OUTLET PORTS ON
CIRCULATING MODELS. DOING SO MAY RE­SULT IN A POTENTIAL FIRE HAZARD.

If you plan to raise the fireplace and hearth
extension, build the platform assembly then
position fireplace and hearth extension on top.
Secure the platform to the floor to prevent
possible shifting.

CLEARANCES

Minimum clearance to combustibles for the
fireplace is as follows; sides and back – 1/2"
(13mm), combustible floor – 0" (0mm), adja­cent wall 18" (457mm), adjacent shielded wall
(

K factor of .84 or less 40" W x 40" H

(305mm), ceiling – 37-1/2" (953mm).

to page 17 for more detail

.

Note: Clearance at the nailing flange for both
fireplace models is 0" (0mm).

Note: Adjacent wall considerations are for an
adjacent wall on only a single side. Walls
should not be placed at minimum distance at
both sides of the fireplace.

) 12"

Refer

Combustible
Wall

Maintain
1/2" (13mm)
Air Space
at Sides
and Back

Hearth

1/2" (13mm)

Metal Safety Strip

Extension

Floor

Figure 6

Figure 7

Step 2. Insert the provided metal safety strips,

beneath the fireplace as illustrated (

7 and 8

). The safety strips should overlap 1/2"

Figures 6,

min. for continual coverage of the floor.

Note: Safety strips are not required when fire­place rests on a noncombustible surface.

Note: Install the hearth extension only as illus­trated (see Figures 43 and 44).

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

5

The safety strips should extend from front of
the fireplace at least 1-1/2" and should extend to
be at least flush with the sides. In the event a
wooden support is used to elevate the fireplace
above the floor, a “Z” type safety strip should be
fabricated and used to protect the front surface
of the wood support as well as the floor beneath
the hearth extension (

Figures 8 and 9

). The
safety strips should be tacked down to prevent
possible movement.

FIREPLACE SPECIFICATIONS

11-1/2"

(292mm)

15"

(381mm)

6-1/2"

(165mm)

Note: The “Z” type safety strip is not supplied.

1-1/2"

(38mm)

Metal Safety Strips
with 1/2" (13mm) Min.
Overlap

Figure 8

Blocking

Special “Z” Metal Safety

2"

(51mm)

Strips with 1/2" (13mm) Min.
Overlap

Figure 9

Combustion

Air Inlet

9-1/4"

(235mm)

8"

(203mm)

11"

(279mm)

12-1/2"

(318mm)

24-5/8"

(625mm)

38 = 48" (1219mm)

43 = 52-3/4" (1340mm)

Front (LBC Shown)

49-3/4"

(1263mm)

15"

(381mm)

38 = 38" (965mm)
43 = 42-3/4" (1085mm)

(127mm)

5/8"

(16mm)

49-3/4"

(1263mm)

5"

15-1/4"

(387mm)

12-1/2"

(318mm)

1-3/4"

(44mm)

(248mm)

44-1/8"

(1121mm)

9-3/4"

Gas Line

Access

9-1/4"

(235mm)

Step 3. Refer to fireplace drawings and specifi-

cations on pages 6 and 7 for framing dimensions
and details. Frame appliance enclosure as illus­trated in

Figures 11 through 14

on page 7.

IMPORTANT: UNDER NO CIRCUMSTANCES
CAN THE FIREPLACE TOP SPACERS (

10

) BE REMOVED OR MODIFIED, NOR MAY
YOU NOTCH THE HEADER TO FIT AROUND OR
BE INSTALLED LOWER THAN THE SPACERS.
THE HEADER MAY BE IN DIRECT CONTACT
WITH THE TOP SPACERS BUT MAY NOT BE
SUPPORTED BY THEM.

6

FIGURE

25-5/8"

(651mm)

Left Side

9-3/4"

(248mm)

Figure 10

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

38 = 26-5/16" (668mm)
43 = 31-1/16" (788mm)

15" (391mm)

10"

(254mm)

38 = 48" (1219mm)
43 = 52-3/4" (1340mm)

Top View

25-5/8"

(651mm)

Right Side

25-5/8"

(651mm)

5/8" (16mm)