Lennox Crestline LSBV-3628MN User manual

INSTALLATION INSTRUCTIONS
MODELS
P/N 850042M Rev. C 07/2010
Crestline™Series B-Vent Gas Fireplaces
36"/42" LSBV Models
3/22/2010
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
INSTALLATEUR: Laissez cette notice avec l'appareil.
CONSOMMATEUR: Conservez cette notice pour consul-
tation ultérieure.
WARNING: If the information in these instructions is
causing property damage, personal injury or death.
- Ne pas entreposer ni utilizer d’essence ni d’autres
de cet appareil ou de tout autre appareil.
- QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareil.
• Ne touchez à aucan interrupteur. Ne pas vous servir
des téléphones se trouvant dans le bâtiment où vous
trouvez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions du
fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de gaz,
appelez le service des incindies.
- L’installation et l’entretien doivent être assurés par un
le fournisseur de gaz.
AVERTISSEMENT: Assurez-vous de bien suivre les
instructions données dans cette notice pour réduire
au minimum le risque d’incindie ou d’explosion ou
pour éviter tout dommage matériel, toute blessure
ou la mort.
This appliance may be installed in an aftermarket permanently located, manufactured home (USA only) or mobile
home, where not prohibited by local codes. This appliance is only for use with the type of gas indicated on the rating
WARNING
AVERTISSEMENT
UNE SURFACE VITRÉE CHAUDE PEUT
CAUSER DES BRÛLURES.
LAISSER REFROIDIR LA SURFACE
VITRÉE AVANT D'Y TOUCHER.
NE PERMETTEZ JAMAIS À UN ENFANT
DE TOUCHER LA SURFACE VITRÉE.
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN TO
TOUCH GLASS.
- and liquids in the vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
•
department.
- installer, service agency or the gas supplier.
This manual is one of a set of two supporting this product.
Refer to P/N 875035M for Care and Operation Instructions.
This manual is available in French. Order P/N 506223-07.
Ce manuel est disponible en francais. Simplement en faire
la demande numéro de la pièce 506223-07.
Millivolt Models Electronic Models
LSBV-3628MN LSBV-4228MN LSBV-3628EN
LSBV-3628MP LSBV-4228MP LSBV-3628EN-H
LSBV-3628MN-H LSBV-4228MN-H LSBV-4228EN
LSBV-3628MP-H LSBV-4228MP-H LSBV-4228EN-H
OTL Report No. 116-F-45-5
US
Portland

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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
TABLE OF CONTENTS
Packaging .........................................page 2
Introduction ......................................page 2
Massachusetts and New York
Requirements..................................page 3
General Information ..........................page 3
Location............................................page 4
Appliance Specifications ...................page 4
Clearances ........................................page 5
Gas Vent Rule ...................................page 5
Framing Specifications......................page 5
Assembly Steps ................................page 6
Installation ........................................page 6
Vent System Installation ...................page 7
Field Wiring.......................................page 7
Connecting Gas Line .........................page 8
Outside Air Kit Installation.................page 8
Log and Glowing Embers
Installation ...................................page 9
Appliance Operation..........................page 10
Manual Limit Switch .........................page 10
Millivolt Appliance Checkout .............page 11
Electronic Appliance Checkout..........page 11
Adjustment........................................page 11
Finishing Requirements ....................page 12
Cold Climate Insulation .....................page 12
Attaching "Safety-in-Operation"
Warnings.............................. page 13
Installation Accessories ....................page 14
Gas Conversion Kits .................. page 15
INTRODUCTION
The millivolt appliances are designed to operate
on either natural or propane gas. A millivolt gas
controlvalvewithpiezoignition systemprovides
safe, efficient operation.
The electronic appliances are designed to
operate on either natural or propane gas. An
electronic intermittent pilot system provides
safe, efficient operation. External electrical
power is required to operate these units.
These appliances comply with National Safety
Standards and are tested and listed by Omni-
Test Laboratories (Report No. 116-F-45-5) to
ANSI Z21.50b (in Canada, CSA-2.22b), and
CAN/CGA-2.17-M91 in both USA and Canada,
as vented gas fireplaces.
Installation must conform to local codes. In
the absence of local codes, installation must
complywiththe current National Fuel GasCode,
ANSI Z223.1 (NFPA 54) (in Canada, the current
CAN/CGA B149 installation code). Electrical
wiring must comply with local codes. In the
absence of local codes, installation must be in
accordance with the National Electrical Code,
NFPA 70, latest edition (in Canada, the current
CSA C22.1 Canadian Electric Code).
These Crestline series appliances have been
designed, tested and listed for use with Security
Chimney's 10" B-vent system. Refer to page 14
for a complete listing of the 10" B-vent com-
ponents available for use with these models.
PACKAGING
The assembledventedgasfireplaceispackaged
with the following items:
•One foam packaged log set located in firebox
area.
• One bag of glowing embers (rockwool)
located in the bottom compartment.
•One envelope containing the literature pack-
age, which consists of the homeowner's
manual, installation instructions, and war-
ranty. Envelope is located in the control area.
Please read and understand these
instructions before beginning your
installation.
Children and adults should be alerted to the
hazards of high surface temperature and
should stay away to avoid burns or clothing
ignition.
Les enfants et les adultes devraient être infor-
mésdesdangersqueposentles températures
de surface élevées et se tenir à distance an
d’éviter des brûlures ou que leurs vêtements
ne s’enamment.
DO NOT ATTEMPT TO ALTER OR MODIFY
THE CONSTRUCTION OF THE APPLIANCE OR
ITS COMPONENTS. ANY MODIFICATION OR
ALTERATION MAY VOID THE WARRANTY,
CERTIFICATION AND LISTINGS OF THIS UNIT.
WARNING
Young children should be care-
fully supervised when they are
in the same room as the appli-
ance. Toddlers, young children
and others may be susceptible
to accidental contact burns. A
physicalbarrierisrecommended
if there are at risk individuals in
the house. To restrict access to
a replace or stove, install an
adjustable safety gate to keep
toddlers, young children and
other at risk individuals out of
the room and away from hot
surfaces.
AVERTISSEMENT
Lesjeunesenfantsdevraientêtre
surveillésétroitementlorsqu’ils
se trouvent dans la même pièce
que l’appareil. Les tout petits,
lesjeunes enfants ou lesadultes
peuvent subir des brûlures s’ils
viennent en contact avec la sur-
face chaude. Il est recommandé
d’installerunebarrièrephysique
si des personnes à risques habi-
tent la maison. Pour empêcher
l’accès à un foyer ou à un poêle,
installez une barrière de sécu-
rité;cettemesureempêcherales
tout petits, les jeunes enfants et
toute autre personne à risque
d’avoir accès à la pièce et aux
surfaces chaudes.
WARNING
B-Vent appliances are not
designedtooperateinnegatively
pressured environments (pres-
sure within the home is less than
pressures outside). Signicant
negatively pressured environ-
ments caused by weather, home
design, or other devices may
impact the operation of these
appliances. Negative pres-
sures may result in poor ame
appearance, sooting,damageto
property and/or severe personal
injury. Do not operate these
appliances in negatively pres-
sured environments.

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LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning are similar
to the flu with headaches, dizziness and/
or nausea. If you have these signs, obtain
fresh air immediately. Turn off the gas sup-
ply to the appliance and have it serviced by
a qualified professional, as it may not be
operating correctly.
These appliances are equipped with an inte-
gral combustion air door and actuator arm.
Combustion air kits are optional and must be
installed before removing the securing screw
allowing the movement of the combustion air
actuator arm (see Step 7 on page 8).
GENERAL INFORMATION
Note: Installation and repair should be per-
formed by a qualified service person. The
appliance should be inspected annually by a
qualified professional service technician. More
frequent inspections and cleanings may be
required due to excessive lint from carpeting,
bedding material, etc. It is imperative that the
control compartment, burners and circulating
air passage ways of the appliance be kept clean.
S'assurer que le brùleur et le compartiment
des commandes sont propres. Voir les
instructions d'installation et d'utilisation
qui accompagnent l'apareil.
Provide adequate clearances around air open-
ings and adequate accessibility clearance for
service and proper operation. Never obstruct
the front openings of the appliance.
DO NOT ATTEMPT TO ALTER OR MODIFY
THE CONSTRUCTION OF THE APPLIANCE OR
ITS COMPONENTS. ANY MODIFICATION OR
ALTERATION MAY VOID THE WARRANTY,
CERTIFICATION AND LISTINGS OF THIS UNIT.
Theseappliancesaredesignedtooperateonnatu-
ral or propane gas only. The use of other fuels or
combinationoffuelswilldegradetheperformance
of this system and may be dangerous.
Input of appliance are 45,000 BTU/HR for
Propane models and 50,00 BTU/HR for Natural
Gas models.
WARNING: THESE FIREPLACES ARE
VENTED DECORATIVE GAS APPLIANC-
ES. DO NOT BURN WOOD OR OTHER
MATERIAL IN THESE APPLIANCES.
These appliances must not be connected to a
chimney or flue serving a separate solid fuel
burning appliance.
Do not use these appliances if any part has
been under water. Immediately call a qualified,
professional service technician to inspect the
appliance and to replace any parts of the control
system and any gas control which have been
under water.
Ne pas se servir de cet appareil s'il a été
plongédansl'eau, complètementouenpartie.
Appeler un technicien qualifié pour inspecter
l'appareiletremplacertoutepartiedusystème
de contrôle et toute commande qui ont été
plongés dans l'lau.
This appliance may be installed in an after-
market permanently located, manufactured
home (USA only) or mobile home, where not
prohibited by local codes. This appliance is
only for use with the type of gas indicated
on the rating plate. This appliance is not
convertible for use with other gases, unless
a certified kit is used.
Cet appareil peut être installé dans un
maison préfabriquée (É.-U. seulement)
ou mobile déjà installée à demeure si
les réglements locaux le permettent. Cet
appareil doit être utilisé uniquement avec
les types de gaz indiqués sur la plaque sig-
nalétique. Ne pas l'utiliser avec d'autres
gaz sauf si un kit de conversion certifié
est installé.
Massachusetts and New York
Requirements
REQUIREMENTS FOR THE COMMON-
WEALTH OF MASSACHUSETTS
These fireplaces are approved for installation in
the US state of Massachusetts if the following
additional requirements are met:
• Installation and repair must be done by a
plumber or gas fitter licensed in the Com-
monwealth of Massachusetts.
• The exible gas line connector used shall not
exceed 36 inches (92 centimeters) in length.
• The individual manual shut-off must be a
T-handle type valve.
NEW YORK CITY, NEW YORK (MEA)
These fireplaces are approved for installation
in New York City in the US state of New York,
if the following additional requirement is met:
• An outside air kit (FOAK-4 or FOAK-4LD)
must be installed. See Installation Acces-
sories on page 14.
Gas Orifice Size
Type Elevation
0 - 4500’
(0 - 1370 m)
0 - 4500’
(0 - 1370 m)
Natural Propane
#26 #45
#45
LSBV-3628
LSBV-4228
#26
WARNING: CHILDREN AND ADULTS
SHOULD BE ALERTED TO THE HAZARDS
OFHIGHSURFACETEMPERATURES.USE
CAUTION AROUND THE APPLIANCE TO
AVOID BURNS OR CLOTHING IGNITION.
YOUNG CHILDREN SHOULD BE CARE-
FULLY SUPERVISED WHEN THEY ARE IN
THE SAME ROOM AS THE APPLIANCE.
WARNING: DO NOT PLACE CLOTHING
OR OTHER FLAMMABLE MATERIALS ON
OR NEAR THIS APPLIANCE.
AVERTISSEMENT: SURVEILLER LES
ENFANTS. GARDER LES VÊTEMENTS,
LES MEUBLES, L'ESSENCE OU AUTRES
LIQUIDES À VAPEUR INFLAMMABLES
LIN DE L'APPAREIL.
WARNING: THIS APPLIANCE MAY ONLY
BEFITTEDWITHDOORSCERTIFIEDFOR
USE WITH THE APPLIANCE.
WARNING: FAILURE TO COMPLY WITH
THE INSTALLATION AND OPERATING IN-
STRUCTIONS PROVIDED IN THIS DOCU-
MENT WILL RESULT IN AN IMPROPERLY
INSTALLEDANDOPERATINGAPPLIANCE,
VOIDING ITS WARRANTY. ANY CHANGE
TO THIS APPLIANCE AND/OR ITS OP-
ERATING CONTROLS IS DANGEROUS.
IMPROPER INSTALLATION OR USE OF
THIS APPLIANCE CAN CAUSE SERIOUS
INJURY OR DEATH FORM FIRE, BURNS,
EXPLOSION OR CARBON MONOXIDE
POISONING.
WARNING
Improper installation, adjust-
ment, alteration, service or
maintenance can cause injury
or property damage. Refer to
this manual. For assistance or
additional information consult
a qualified installer, service
agency or the gas supplier.

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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
APPLIANCE SPECIFICATIONS
Figure 2
Front View
12-15/32
28-15/32 41-5/16
47-9/32
52-11/32
LSBV-36: 41-3/4
LSBV-42: 47-3/4
7-3/32
5-3/4 LSBV-36: 37
LSBV-42: 43
Left Side View
1-7/16
8-7/8
Right Side View
7-7/16
15-27/32
1-25/32
4-13/32
16-1/16 2-9/32
Top View
LSBV-36: 23-1/2
LSBV-42: 29-1/2
20-1/32
8-15/32
19/32
Gas Line
Or Switch
Wire Outlet
Gas Line
Or Switch
Wire Outlet
Combustion
Air Inlet
Junction
Box
Location
In selecting the location, the aesthetic and func-
tional use of the appliance are primary concerns.
However, vent system routing to the exterior and
access to the fuel supply are also important. Due
to high temperatures the appliance should be
locatedout of trafficandawayfromfurnitureand
draperies.Considerationshouldbegiventotraffic
ways, furniture, draperies, etc., due to elevated
surface temperatures. The location should also
be free of electrical, plumbing or other heating/
air conditioning ducting.
LOCATION
Typical Locations
Figure 1
Test gage connections are provided on the front
of the millivolt gas control valves (identified OUT
forthemanifoldsideandINforinletpressureside.
Nominal operating pressures for the manifold
side of the gas control system are; 3.5 inches
water column (0.87 kPa) for natural gas models
and 10 inches water column (2.49 kPa) for
propane gas models.
Minimum inlet gas pressure to the appliance is
5.0 inches water column (1.24 kPa) for natural
gas and 11 inches water column (2.74 kPa) for
propane for the purpose of input adjustment.
Maximum inlet gas supply pressure to the ap-
pliance is 10.5 inches water column (2.61kPa)
for natural gas and 13.0 inches water column
(3.23 kPa) for propane. The appliance must
be isolated from the gas supply piping system
(by closing its individual manual shut-off valve)
during any pressure testing of the gas supply
piping system at test pressures equal to or less
than 1/2 psig (3.5) kPa).
The appliance and its individual shut-off valve
must be disconnected from the gas supply
piping system during any pressure testing of
that system at pressures in excess of 1/2 psig
(3.5 kPa).

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LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
FRAMING SPECIFICATIONS
Figure 4
Figure 5
Figure 6
Framing Dimensions
Note: All framing dimensions calcu-
lated for 1/2" dry wall at the appliance
face. Ifsheathingthechase or finishing
withotherthicknessmaterials,calcula-
tions will need to be made.
Figure 7
Venting
GasVentRule–Gasventcapsarenotpermitted
within 8 feet (2.4 m) of a vertical wall or similar
obstruction. Gas vent caps that are located 8' or
more from a portion of a building which extends
at an angle greater than 45° upward from the
horizontal may terminate in accordance with
Table 1 (Figure 3), provided that in no case
shall any discharge opening on the cap be less
than 2' (610 mm) horizontally from the roof
surface (National Fuel Gas Code ANSI Z223.1
(NFPA 54) 7.6.2) (CAN/CGA B149).
CLEARANCES
Minimum clearance to combustibles for the
appliance is as follows: sides and back - 3/8"
(9.52 mm), oor - 0" (0 mm), adjacent wall - 0"
(0 mm), ceiling - 37-1/2" (953 mm).
Table 1
Note: Venting terminals shall not be recessed
into a wall or siding.
Flat to 6/12 1' 0" 0.3
Over 7/12 to 9/12 2' 0" 0.6
Over 10/12 to 12/12 4' 0" 1.2
Over 13/12 to 16/12 6' 0" 1.8
Over 17/12 to 21/12 8' 0" 2.4
Roof Slope
Minimum Height
from Roof to Lowest
Discharge Opening
Feet Meters
Roof Pitch is X/12
12
X
Minimum Height from Roof
to Lowest Discharge Opening
Fireplace Opening Width
42-1/4"
(1073 mm)
A
B
C
D
E
48-1/4"
(1226 mm)
52-1/2"
(1344 mm)
52-1/2"
(1344 mm)
23-9/16"
(599 mm)
29-9/16"
(751 mm)
11-1/4"
(286 mm)
14-1/4"
(362 mm)
63-1/2"
(1613 mm)
69-1/2"
(1765 mm)
LSBV-3628 LSBV-4228
31-3/4"
(807 mm)
F
G
H
J
K
34-3/4"
(883 mm)
20-1/2"
(521 mm)
20-1/2"
(521 mm)
4"
(102 mm)
4"
(102 mm)
7-1/2"
(190 mm)
7-1/2"
(190 mm)
44-3/16"
(1122 mm)
49-1/8"
(1248 mm)
The appliance should be mounted on a fully
supported base extending the full width and
depth of the unit. The appliance may be located
on or near conventional construction materials.
However, if installed on combustible materials,
such as carpeting, vinyl tile, etc., a metal or
woodbarriercoveringtheentirebottomsurface
must be used.
These appliances may be used for bedroom
installations in the United States and are listed
accordingly. These units may not be installed
in bedrooms in Canada.
Figure 3
Corner Installation
KD
C
A
E
G
F
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
Rough
Framing Face
(Unfinished Shown)
FOAK-4
Combustion
Air Kit
AHH
C
G
Inside Chase
Back Wall of Chase/Enclosure
Including Finising Materials
if any
Rough
Framing Face
(Unfinished Shown)
FOAK
Combustion
Air Kit
FOAK
Combustion
Air Kit
A
Outside Chase
G
C
J
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
Rough Framing Face
(Unfinished Shown)
Optional Locations
FATO Adapter
(Optional)
Header
B
A
Fireplace Framing

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LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Step 3. Position the Appliance - Slide the
fireplace into prepared framing or position
fireplace in its final position and frame later.
Refer to fireplace drawings and specifications
on pages 4 and 5 for framing dimensions and
details. Framing header may be positioned
directly on the fireplace top spacers.
IMPORTANT: UNDER NO CIRCUMSTANCES
CAN THE FIREPLACE TOP SPACERS (refer
to FIGURE 2 ) BE REMOVED OR MODIFIED,
NOR MAY YOU NOTCH THE HEADER TO FIT
AROUNDORBEINSTALLEDLOWERTHANTHE
SPACERS. THE HEADER MAY BE IN DIRECT
CONTACT WITH THE TOP SPACERS BUT MAY
NOT BE SUPPORTED BY THEM.
All appliances are equipped with a gas flex line
and shutoff valve attached directly to the gas
control valve. To quickly and easily complete
the gas line routing, use the gas flex line kit.
4. Use this information and consult your local
building code to determine if you need ad-
ditional support.
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.
INSTALLING THE FIREPLACE
Step 1. Construct the Appliance Framing -
Frame appliance enclosure as illustrated in
Figures 4 through 7 on page 5.
Note: The framed depth, 20-1/2" (521 mm)
from a framed wall, must always be measured
from a finished surface. If a wall covering such
as drywall is to be attached to the rear wall,
then the 20-1/2" (521 mm) must be measured
from the drywall surface. It is important that
this dimension be exact.
If the appliance is to be elevated above floor
level, a solid continuous platform must be
constructed.
The header may rest on the top metal spacers,
but must not be notched to fit around them.
Consult all local codes.
Step 2. Route Gas Supply Line - Route gas
line (Figure 8 ) using techniques and materials
prescribed by local and/or national codes. It is
recommended that a gas line of 1/2" or greater
diameter be used to allow full gas volume to
the fireplace. Undue pressure loss will occur
if the pipe is too small. The appliance, as set
up at the factory, is best suited for use with
a gas line routed from the left side. The gas
line may however be alternately routed from
the right side.
This unit is provided with a gas line/switch wire
outlet at both sides (see Figure 2 ). The gas line
may be routed through this opening at either
the right or left side. Route the Millivolt switch
wire through the opening opposite form the
gas line. To avoid cutting the Millivolt switch
wire, do not route the switch wire through the
opening with the gas line.
When rigid pipe is used, an ANSI approved
manual shut-off valve and union must be
installed upstream of the fireplace.
Ensure that a sediment trap is installed in
the existing gas line, if not, install a sedi-
ment trap upstream to prevent moisture and
contaminants from passing through trap to
the appliance controls and burners. Failure
to do so could prevent the appliance from
operating reliably.
IMPORTANT: HOLD GAS VALVE SECURELY TO
PREVENTMOVEMENTWHENCONNECTINGTO
INLET GAS LINE
An external regulator must be used on all pro-
pane (L.P.G.) heaters to reduce the supply tank
pressure to 13" w.c. (maximum). Any copper
tubing used to supply propane (L.P.G.) from
the tank must be internally tinned.
Figure 8
10-1/2"
(269 mm)
3-1/2"
(79 mm)
RIGHT
SIDE
LEFT
SIDE
7-1/4"
(184 mm)
3-1/2"
(79 mm)
WARNING: CONNECTING DIRECTLY TO
AN UNREGULATED PROPANE (L.P.G.)
TANK MAY CAUSE AN EXPLOSION.
ASSEMBLY STEPS
The typical sequence of installation follows,
however, each installation is unique resulting
in variations to those described.
1. Construct the appliance framing.
2. Route gas supply line to appliance location.
3. Position the appliance.
4. Install the vent system and exterior termi-
nation.
5.Fieldwireandinstalloperatingcontrolswitch.
6. Make connection to gas supply.
7. Install (optional) outside Air Kit.
8. Install the logs and glowing embers
(rockwool).
9. Check appliance operation.
10. Adjust burner to ensure proper flame
appearance.
11. Attach "Safety in Operation" Warnings.
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. 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:
1. Estimate the total weight of the fireplace
system and surround materials such as brick,
stone, etc., to be installed.
2. Measure the square footage of the oor space
to be occupied by the system, surrounds and
hearth extensions.
3. Note the oor 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.

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LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 10
Step 4. Install the Vent System and
Exterior Termination
Slip a 10" (254 mm) B-Vent system over the
appliance collar (Figure 10 ) and secure with
four sheetmetal screws (# 8 or larger). Minimum
overall height of the vent system and appliance
must be 12' (3.66 m) vertical (no offset) or 17'
(5.18 m) when an offset up to 45 degrees from
the vertical is used. The lower part of the offset
must not begin less than 3' (0.914 m) above the
top of the fireplace (see Figure 11 ).
Maximum overall height of the vent system and
appliance should not exceed 40 feet (12.19m).
Install the B-vent system in accordance with
the vent manufacturer's instructions.
CAUTION: THIS APPLIANCE CANNOT BE
VENTED HORIZONTALLY.
Note: Refer to the vent manufacturers instal-
lation instructions for variations of venting
techniques. If common venting of several units
is contemplated, it should be discussed with an
architect and the local Building Department.
Step 5. Field Wiring – Refer to Section A for
millivolt appliances and Section B for electronic
appliances.
A. Millivolt Wiring – Units are fitted at the fac-
tory with an SIT millivolt gas control valve. The
valve has been tested with and approved for use
with these appliances and is listed accordingly.
Refer to Figure 12 for the wiring diagram.
The gas valve has been set in place and has
been pre-wired at the factory. Locate the wall
switch (not provided) or optional remote control
in the desired location and connect the millivolt
wire (see Figure 12 ).
CAUTION: DO NOT CONNECT THE WALL
SWITCH TO A 120V POWER SUPPLY.
Note: The ends of the 18' coiled wire must be
connected to the wall switch (not supplied) for
the appliance to operate.
Note: The nailing flanges and the area directly
behind the nailing tabs are exempt from the
clearances described on the fireplace clear-
ance label.
Figure 9
12 ft.
Minimum
17 ft.
Minimum
45 degrees
max.
3 ft.
Minimum
to Offset
6d Nail or
Equivalent
B.Electronic Wiring – The electronic appliance
must be connected to the main power supply.
To install, route a 3-wire 120V 60Hz power sup-
ply to the appliance junction box and ground.
Locate and install a low voltage (24V) wall switch
(not supplied) in the desired location. Connect
the low voltage wire to this switch (see Figure
13 on Page 8 ).
IMPORTANT: Ground lead must be
connected to the green screw located
on the outlet box. See Figure 16 on
page 9. Failure to do so will result in
a potential safety hazard. The appli-
ance must be electrically grounded in
accordance with local codes or, in the
absence of local codes, the National
Electrical Code, ANSI/NFPA 70-(latest
edition). (In Canada, the current CSA
C22-1 Canadian Electrical Code.)
BLACK BLACK
DAMPER SWITCH LIMIT SWITCH
MILIVOLT WIRING DIAGRAM
TH
TP TP TH
THERMOPILE
WALL MOUNTED
ON/OFF SWITCH
GAS VALVE
BLACK
WHITE
10
Type B-Vent
Flue Outlet
Collar
Securing
Screws
Figure 11
Figure 12
Fireplace should be secured to side framing
members using the full length 1/2 inch nailing
flanges that are integral to the appliance at each
side. Use 6d nails or equivalent (Figure 9 ).

8
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 14
1. Route a 3-wire 120V 60Hz power supply
line to the appliance junction box wires and
ground (Figures 13 ).
2.Afterwiring iscomplete,replacetheappliance
junction box cover and secure with the hex head
screws previously removed.
Step 6. Connecting Gas Line – Make gas line
connections. All codes require a shut-off valve
mounted in the supply line. Figure 16 on page
9 illustrates the method for connecting the gas
supply.Theflex-linemethodutilizing thegasflex
line provided with the appliance is acceptable
in the U.S., however, Canadian requirements
vary depending on locality. Installation must
be in compliance with local codes.
The gas control valve is located in the lower
control compartment. To access the valve
remove the refractory access panel and set
aside (Figure 14). The control valve has a
3/8" (10 mm) NPT thread inlet port.
Secure all joints tightly using appropriate
toolsandsealingcompounds(ensurepropane
resistant compounds are used in propane
applications).
Turn on gas supply and test for gas leaks, us-
ing a gas leak test solution (also referred to as
bubble leak solution).
Refractory
Access Panel
SIT Valve
Shown
Note: Using a soapy water solution (50%
dish soap, 50% water) is an effective leak test
solution but it is not recommended, because
the soap residue that is left on the pipes/ttings
can result in corrosion over time. Never use
an open flame to check for leaks.
A. Light the appliance (refer to the lighting
instructions label in the control compartment
or in the Homeowner's Care and Operation
Instructions).
B. Brush all joints and connections with the gas
leak test solution to check for leaks. If bubbles
are formed, or gas odor is detected, turn the
gas control knob to the “OFF” position. Either
tighten or refasten the leaking connection and
retest as described above.
C. When the gas lines are tested and leak free,
be sure to rinse off the leak testing solution.
Step 7. Optional Outside Air Kits – Combus-
tion (outside make-up air) kits, Model FOAK-4
or FAOK-4LD, may used with these appliances.
Refer to the installation instructions packaged
with the air kits for specific installation infor-
mation. The outside air kit must be installed
before the fireplace is framed and enclosed in
the finished wall.
Outside air drawn into the fireplace supplies air
to the fire for combustion. Only one combus-
tion air duct on the right side of the fireplace
is necessary if installed.
If additional length of duct is necessary, pur-
chase locally available U.L. Class 0 or Class 1
metallic ducting. The duct may extend up to
50' (15.24 m) in any direction.
There is one hand operated air gate shut-off, for
utside make-up air, located at the right side of
thefireplaceopeningbehindthescreen.To open,
lift and pull the handle out. The combustion air
damper should be open when the fireplace is
in use and, to prevent outside air from entering
your home, fully closed when the fireplace is
not in operation.
WHITE
DAMPER SWITCH LIMIT SWITCH
CONNECTOR
BLACK BLACK
ELECTRONIC WIRING DIAGRAM
BK
W
24 V.
TRANSF
120 V.
ELECTRONIC IGNITION
CONTROL BOARD APPLIANCE MOUNTED
ON/OFF SWITCH
PILOT BURNER
IGNITER-SENSOR
ASSEMBLY
GAS VALVE
EV2 EV1
GROUND
CONNECTOR
GREEN LED
WHITE
ORANGE
BLACK
PURPLE
GREEN
BLUE
BLACK
WHITE
Junction Box
White
Green
Red
Black
Neutral
Side of
Receptacle
Green
Ground
Screw
Hot
Side of
Receptacle
Tab
Broken
Plug blower
into this
receptacle
Tab Intact
120 VAC - Black
neerG-dnuorG
etihW-lar
t
ueN
CONNECTOR
WALL MOUNTED ON/OFF
SWITCH (OPTIONAL) Figure 13

9
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 15
Note: Supply wires may be alternatively connected to the outlet using the screw terminals, however
the black supply wire must be wired to a terminal that is opposite (across the outlet) the point
where the white supply wire is connected (Figure 15 ).
Figure 16
CAUTION: NEVER LOCATE INLET OF AN OUT-
SIDEAIRHOODWHEREITCANBEBLOCKEDBY
SHRUBS,SNOWDRIFTS,ETC.NEVERLOCATE
INLETINGARAGEORANYAREAWHERETHERE
IS ANOTHER FUEL BURNING APPLIANCE OR
PRODUCTS EMITTING COMBUSTIBLE GASES
SUCH AS PAINT, GASOLINE, ETC. IN COLD
CLIMATES, IT IS RECOMMENDED THE COM-
BUSTION AIR DUCT BE INSULATED.
Outside combustion air ducting may be run
upwards or vertically through framing and ceil-
ing joists, with the hood installed through an
outside wall and 3' (1 m) below the termination.
Ducting may also be run downward through
floor joists and under the home to a ventilated
crawlspace not considered part of the living
area of the home.
After installing the outside air kit, remove the
cover from the shut off lever in the left side of
the firebox opening.
Note: Do not terminate combustion air kit in
attic space under any circumstances.
After completing the installation of the optional
combustion air vent system the actuator arm
must be put in service and tested to ensure
proper operation before completing any enclo-
sure around the firebox. Failure to do so may
result in extensive and costly rework.
Operate the actuator through several cycles
including the closed position. Ensuring proper
operation and freedom of movement. Return
the actuator arm to the closed position.
Step 8. Installing Logs and Glowing Embers
(Rockwool) – The logs are packaged within
the firebox. Remove the rockwool from the
packaging and tear into dime size pieces (see
Homeowners Care and Operation Instructions).
Do not use more than is necessary.
Displace Lava Rock to the center of the burner
pan when removing and reinstalling the burner
tube.
1/2" x 3/8" Flare
Shut-Off Valve
3/8" Flex Tubing
Gas Flex Line (provided)
Gas Stub
3/8" NPT Flare
Fitting (Remove
Before Hard Piping)
Gas Valve
(Millivolt or Electronic)
White
(Supply)
Black
(Supply)
Bipolar
Terminal
Screw
120 Vac
60 Hz
Green Wire Ground
Connection
Red
(Supply)
120 Vac
60 Hz
120 Vac
60 Hz

10
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 18
Refer to the Homeowners Care and Operation
Instructions for detailed log description and
placement instructions. Log set shown in this
document (Figure 17 ) is typical, installation
of all sets are similar.
APPLIANCE OPERATION
Step 9. Checking the System – With gas line
installed run initial system checkout before
closing up the front of the unit. Follow the
pilot lighting instructions provided in the Hom-
eowner's Care and Operation Instructions. For
piezo ignitor location see Figure 18 (millivolt
appliances only).
Note: Instructions are also found on the pull
out lighting instructions label attached to the
gas control valve.
When first lighting the appliance, it will take
a few minutes for the line to purge itself of
air. Once purging is complete, the pilot and
burner will light and operate as indicated in the
instruction manual.
MANUALLY-RESET BLOCKED FLUE SAFETY
SWITCH
Thisappliance isequipped withamanually-reset
blocked flue safety switch. Refer to Figure 19
for its location. If during appliance operation,
the flame goes out (independently of the burner
on/off wall switch), it may be due to the opera-
tion of this safety limit switch. First allow the
appliance to cool. Then reset the safety switch
by pushing the red reset button.
This reset button is located on the back of the
limit switch, between the wire terminals (see
Detail A of Figure 19 ).
The appliance should then relight and remain
lit. If this does not occur, turn off the appli-
ance and call a qualified service technician.
Figure 19
Detail A
Manual Reset
Limit Switch
Lintel
Extension
Right Side
Refractory Panel
Reset
Button
Wire
Terminals
Subsequent lightings of the appliance will
not require such purging. Inspect the pilot
flame (remove logs, if necessary, handling
carefully).
Piezo
Ignitor
SIT Valve
Figure 17

11
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 22
Adjustment
To adjusttheflame,positiontheairshutter to the
nominal setting (Figure 22 ). Allow the burner
to operate for at least 30 minutes. Observe the
flame continuously. If it appears weak or sooty
as previously described, adjust the air shutter
open or closed until desired effect is achieved.
Note: If the flame still appears anemic with the
air shutter closed all the way (usually a result
of lengthy vertical venting runs), turn off the
appliance, turn off the gas supply, wait for the
parts to cool and access the air shutter. The
shutter is prevented from actually closing by a
tab that is bent over into the opening. Remove
this obstruction by bending back. Reassemble
and restart the appliance and after 24 minutes
reobserve the flame. Adjust the air shutter as
described.
Figure 21
Replace logs if removed for pilot inspection.
To light the burner; rotate the gas valve control
knob counterclockwise to the “ON” position
(“ON” will be to the right hand side of the valve).
Turn “ON” the remote wall switch.
Electronic Appliance Checkout
To light the burner, turn ‘ON’ the optional remote
wall switch. Ensure the ignitor lights the pilot.
The pilot flame should engulf the flame rod as
shown in Figure 21.
Step 10. Adjustments – The following para-
graphs address adjustment concerns and
procedures.
Flame Appearance and Sooting
Proper flame appearance is a matter of taste.
Generally most people prefer the warm glow of
a yellow to orange flame. Appliances operated
with air shutter openings that are too large, or
with long vertical vent runs, will exhibit flames
that are blue and transparent. These weak, blue
and transparent flames are termed anemic.
If the air shutter opening is too small sooting
maydevelop.Sootingisindicatedbyblackpuffs
developingatthetipsofverylongorangeflames.
Sooting results in black deposits forming on the
logs, appliance inside surfaces and on exterior
surfaces adjacent to the vent termination. Soot-
ing is caused by incomplete combustion in the
flames and a lack of combustion air entering
the air shutter opening.
To achieve a warm yellow to orange flame with
an orange body that does not soot, the shutter
opening must be adjusted between these two
extremes.
Nosmokeorsootshouldbepresent.Reposition
the log set if the flames impinge on any of them.
If sooting conditions exist, the air shutter
opening on the main burner can be adjusted.
Normally, the more offsets in the vent system,
the greater the need for the air shutter to be
opened further.
Figure 20
When satisfied that the appliance operates
properly, proceed to finish the installation.
Leave the control knob/lever in “ON” position
and turn the remote switch “OFF.” Replace the
refractory access panel.
Millivolt Appliance Checkout
The pilot flame should be steady, not lifting
or floating. Flame should be blue in color with
traces of orange at the outer edge.
The top 3/8" (9 mm) at the pilot generator
(thermopile) should be engulfed in the pilot
ame. The ame should project 1" (25 mm)
beyond the hood at all three ports (Figure 20 ).
3/8" Min
(9 mm)
Hood
Pilot
Nozzels
Ignitor Rod
WARNING:AIRSHUTTERADJUSTMENT
SHOULD ONLY BE PERFORMED BY A
QUALIFIED PROFESSIONAL SERVICE
TECHNICIAN.
Factory Air
Models Shutter Setting
Inches (mm)
LSBV-3628
Gas
Type
Natural 1/8" (3.175 mm)
Propane 1/2" (12.7 mm)
LSBV-4228 Natural 1/8" (3.175 mm)
Propane 1/2" (12.7 mm)
Hood Ignitor Rod
Pilot
Nozzels
Flame
Sensor
Orifice
Air Shutter
Burner Tube
Adjusting
Set Screw

12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 24
COLD CLIMATE INSULATION
Ifyoulivein a coldclimate,sealallcracksaround
your appliance with noncombustible material
and wherever cold air could enter the room. It
isespeciallyimportantto insulate outside chase
cavity between studs and under floor on which
appliance rests, if floor is above ground level.
60"
(1524 mm)
Min. to
Ceiling
12" Min.
(305 mm)
0" Clearance
to Combustible
Side Wall
Max. Projection 12" (305 mm)
Combustible
Mantel
Figure 23
FINISHING REQUIREMENTS
Wall Details and Combustible Mantels
Complete finished interior wall. To install the
appliance facing flush with the finished wall,
position framework to accommodate the thick-
ness of the finished wall (Figure 23 ). Both
Figures 23 and 24 show a combustible mantel
shelf projecting a maximum of 12" (305 mm)
from the wall, and which must be installed a
minimum distance of 12" (305mm) from the
top of the firebox opening. No other mantel
length/height combinations are allowable for
this fireplace.
A hearth extension is not required with this
appliance. Any hearth extension used is for
appearance only and does not have to con-
form to standard hearth extension installation
requirements.
Note: Combustible wall finish materials and/
or surround materials must not be allowed to
encroachthearea defined bythe appliance front
face (black sheet metal). Never allow combus-
tible materials to be positioned in front of or
overlapping the appliance front face.
Fireplace Opening
Typical Installation
10"
Min.
12"
Min.
18"
12"
Max.
Combustible
Mantel and Trim
(See Note)
3 Sheet Metal Screws
#10 x 3/4" Max. Flat Head
5" Top Of Fireplace
Non
Combustible
Material
Sheet Metal
Spacer
Finished Wall
Header
Note: Mantel At Minimum Height Should Be Affixed to Framing Hinge Posts At Right
And Left Of The Fireplace. Do Not Use Molly Bolts In Front Of The Fireplace.
18 5/8"
Non-Combustible Material
1-3/8"
11-3/8"
Min.

13
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
ATTACHINGSAFETYINOPERATIONWARNINGS
It is required that the safety instruction labels
furnished with the fireplace be affixed to the
operation and control point of the fireplace. A
safety instruction label must be affixed to the wall
switch plate where the fireplace is turned on and
off (Figure A) and if used on the remote control
handheld transmitter (see Figure B). To properly
complete the installation of this fireplace, locate
the multi-lingual adhesive labels provided with
the Care and Operation Instructions and proceed
as follows:
1. Locatethe wallswitchthatcontrols thefireplace
(verifytheswitchoperatesthefireplacebyturn-
ing it on and off). Clean the wall switch plate
thoroughly to remove any dust and oils. Affix
the label to the surface of the plate of the wall
switch that controls the fireplace (Figure A).
Choose the language primarily spoken in the
home. If unknown, affix the English language
label.
2. If a remote control is used to control the
fireplace, locate the transmitter and clean it
thoroughly to remove any dust and oils. Affix
the label to the surface of handheld transmit-
ter (Figure B). Choose the language primarily
spoken in the home. If unknown, affix the
English language label.
3. If you are unable to locate the labels, please
call Lennox Hearth Products or your nearest
Lennox Hearth Products dealer to receive ad-
ditional safety instruction labels free of charge.
Cat. No. H8024 Replacement Label Kit
LENNOX HEARTH PRODUCTS
1-800-9-LENNOX
Note: English is red text on clear label. French
and Spanish are white text on black label.
Un foyer chaud peut causer
de graves brûlures
Ne laissez jamais un enfant
toucher à la vitre ou à toutes
autres parties du foyer
AVERTISSEMENT
Hot Fireplace Will Cause Severe Burns Never Allow Children to Touch Glass or other Fire- place Parts
WARNING
La chimenea caliente
causará quemaduras graves
Nunca permita que los niños
toquen el vidrio ni otras
partes de la chimenea
ADVERTENCIA
Figure A
Hot Fireplace Will Cause
Severe Burns
Never Allow Children to
Touch Glass or other Fire-
place Parts
WARNING
Figure B
SAFETY LABEL DIAGRAMS
Un foyer chaud peut causer
de graves brûlures
Ne laissez jamais un enfant
toucher à la vitre ou à toutes
autres parties du foyer
AVERTISSEMENT
APPOSITION DES MISES EN GARDE RELATIVES
À LA SÉCURITÉ D’UTILISATION
Il est impératif que les étiquettes de sécurité fournies
avec le foyer soient collées à côté des dispositifs
de contrôle du foyer. Une étiquette de sécurité doit
être collée sur la plaque de l’interrupteur contrôlant
l’allumage du foyer (voir Figure A) et, le cas échéant,
sur le boîtier de la télécommande (Figure B). Pour
achever l’installation correcte de ce foyer, procédez
comme suit avec les étiquettes adhésives en langues
étrangères fournies avec les instructions d’utilisation
et d’entretien :
1. Repérez l’interrupteur qui contrôle le foyer (vériez
que l’interrupteur contrôle le fonctionnement du
foyer en le faisant basculer de Marche à Arrêt, et
vice-versa). Nettoyez soigneusement la plaque
murale de l’interrupteur pour éliminer la poussière
et les traces de graisse ou d’huile. Collez l’étiquette
sur la surface de la plaque de l’interrupteur mural
qui contrôle le foyer (Figure A). Choisissez la
langue qui est principalement parlée dans la
résidence du propriétaire. En cas de doute, collez
l’étiquette en anglais.
2. Si une télécommande est utilisée pour contrôler
le foyer, nettoyez la soigneusement pour éliminer
la poussière et les traces de graisse ou d’huile.
Collez l’étiquette sur le boîtier de la télécommande
(FigureB).Choisissezla languequi est principale-
ment parlée dans la résidence du propriétaire. En
cas de doute, collez l’étiquette en anglais.
3. Si vous ne trouvez pas les étiquettes, veuillez
appeler Lennox Hearth Products ou votre distribu-
teur Lennox Hearth Products local pour recevoir
gratuitement des étiquettes supplémentaires.
Étiquettes de remplacement, n° cat. H8024
LENNOX HEARTH PRODUCTS
1-800-9-LENNOX
Remarque : Le texte anglais est rouge sur un support
transparent. Le texte français et espagnol est blanc
sur un support noir.
COLOCACIÓNDEADVERTENCIASDESEGURIDAD
EN OPERACIÓN
Se requiere que las etiquetas de instrucciones de
seguridad incluidas con la chimenea se coloquen en
el punto de operación y control de la misma. Se debe
colocar una etiqueta de instrucciones de seguridad
en la placa del interruptor de pared desde el cual se
enciende y se apaga la chimenea (ver la Figura A) y
en el transmisor de control remoto (Figura B) si se
usa. Para completar correctamente la instalación de
esta chimenea, encuentre las etiquetas adhesivas
multilingüesincluidasconlasinstruccionesdecuidado
y operación y haga lo siguiente:
1. Identifique el interruptor de pared que controla
la chimenea (verifique que el interruptor opera la
chimenea encendiéndola y apagándola). Limpie
bien la placa del interruptor de pared para quitar
el polvo y aceite. Pegue la etiqueta en la superficie
delaplacadelinterruptorquecontrolalachimenea
(FiguraA).Seleccioneelidiomaquemássehabla
en la casa. Si no sabe cuál es, use la etiqueta en
inglés.
2. Si se usa un control remoto para controlar la
chimenea, encuentre el transmisor y límpielo bien
para quitar el polvo y aceite. Pegue la etiqueta en
lasuperficiedeltransmisor(FiguraB).Seleccione
el idioma que más se habla en la casa. Si no sabe
cuál es, use la etiqueta en inglés.
3. Si no puede encontrar las etiquetas, sírvase llamar
a Lennox Hearth Products o al distribuidor de
Lennox Hearth Products más cercano para recibir
etiquetasdeinstruccionesdeseguridadadicionales
gratuitas.
Juegodeetiquetasderepuesto-Nºdecat.H8024
LENNOX HEARTH PRODUCTS
1-800-9-LENNOX
Nota: La etiqueta en inglés es transparente con texto
rojo. Las etiquetas en francés y español son negras
con texto blanco.
Step 11. ATTACH "SAFETY IN OPERATION" WARNINGS
It is the installer's responsibility to ensure these warnings are properly affixed during installation. These warning labels are a
critical step in informing consumers of safe operation of this appliance.
DIAGRAMMES DES ÉTIQUETTES DE SÉCURITÉ DIAGRAMAS DE ETIQUETAS DE SEGURIDAD
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS

14
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Wall Switch Kit 85L87 FWSK
Outside Combustion Air Kits
(with duct) 81L87 FOAK-4
(without duct) 81L88 FOAK-4LD
INSTALLATION ACCESSORIES
The following accessory items are available for
use in the installation of this appliance.
OutsideAirKitsModelsFOAK-4andFOAK-4LD
Outside Air kits are available with duct (FOAK-4)
and without duct (FOAK-4LD) for use if outside
combustion air is required or desired. If model
FOAK-4LD is used it must be used in conjunction
with locally purchased, non-combustible Class
1 or Class 0 flexible duct.
Elbow 10" X 45 Degree 10KE45
Firestop BV 10" 10KBF
Storm Collar BV 10" 10KFC
12" Length 10KL1
24" Length 10KL2
36" Length 10KL3
Security 10" B-vent Adjustable Length 10KAL
Adjustable Flashing 1/12 - 7/12 10FA
10" Gas Vent 17/12 - 12/12 10FB
Brace Support BV 10" 10KBS
Rain Cap B-Vent 10KCGV
Roof Brace XBS2
Anchor Plate 10SP
Radiation Shield 10RS
Flat Roof Flashing
With Storm Collar 10KF
The following accessories are not illustrated:
Chase Top Shroud Kits
(Arch Top 3 x 3) H1988 CTSA-33
(Open Top 3 x 3) H1985 CTS0-33
(Open Top 4 x 4) H1987 CTSO-44
(Open Top 4 x 6) H1986 CTS0-46

15
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 25
Pressure
Regulator
Remove
These
Components
Step1. Turn off the gas supply to the appliance.
Remove the front glass door (if used) from the
appliance. Access the control compartment.
Step 2. Carefully remove the logs. Exercise
care as not to break the logs.
Step 3. Locate the screw securing the burner.
Remove the burner and retain the securing
screw.
Millivolt Appliances
Step 4. SIT Systems - Refer to Figure 25 and
the instructions provided with the kit. Using a
Torx T20, remove and discard the three pressure
regulator mounting screws.
Remove the pressure regulator, spring, poppet,
diaphragm and bushing. Discard all removed
components. Ensure the rubber gasket in-
stalled on the back of the replacement pressure
regulator is properly positioned and install the
new pressure regulator using the new screws
supplied with the kit. Tighten screws to 25 In.
lb. torque.
Gas Conversion Kits
In Canada
THE CONVERSION SHALL BE CARRIED OUT
IN ACCORDANCE WITH THE REQUIREMENTS
OF THE PROVINCIAL AUTHORITIES HAVING
JURISDICTION AND IN ACCORDANCE WITH
THE REQUIREMENTS OF THE CAN1-B149.1
AND .2 INSTALLATION CODE.
LA CONVERSION DEVRA ÊTRE EFFECTUÉE
CONFORMÉMENT AUX RECOMMANDATIONS
DESAUTORITÉSPROVINCIALESAYANTJURI-
DICTIONETCONFORMÉMENTAUXEXIGENCES
DUCODED'INSTALLATIONCAN1-B149.1ET.2.
Gas conversion kits are available to adapt your
appliance from the use of one type of gas to
the use of another. These kits contain all the
necessary components needed to complete the
task including labeling that must be affixed to
ensure safe operation.
Kit part numbers are listed here and the steps
that follow detail the conversion procedure.
WARNING: THIS CONVERSION KIT SHALL BE
INSTALLED BY A QUALIFIED SERVICE AGENCY IN
ACCORDANCE WITH THE MANUFACTURER'S IN-
STRUCTIONS AND ALL APPLICABLE CODES AND
REQUIREMENTSOFTHEAUTHORIZEDAGENCYHAV-
ING JURISDICTION. IF THE INFORMATION IN THESE
INSTRUCTIONS ARE NOT FOLLOWED EXACTLY, A
FIRE, EXPLOSION OR PRODUCTION OF CARBON
MONOXIDEMAYRESULTCAUSINGPROPERTYDAM-
AGE, PERSONAL INJURY OR LOSS OF LIFE. THE
INSTALLATIONISNOTPROPERANDCOMPLETEUNTIL
THE OPERATION OF THE CONVERTED APPLIANCE IS
CHECKED AS SPECIFIED IN THE OWNER INSTRUC-
TIONS SUPPLIED WITH THE KIT.
AVERTISSEMENT: CET ÉQUIPEMENT DE CONVERSION
SERA INSTALLÉ PAR UNE AGENCE QUALIFIÉE DE
SERVICE CONFORMÉMENT AUX INSTRUCTIONS DU
FABRICANT ET TOUTES EXIGENCES ET CODES APPLI-
CABLES DE L'AUTORISÉS AVOIR LA JURIDICTION. SI
L'INFORMATION DANS CETTE INSTRUCTION N'EST PAS
SUIVIEEXACTEMENT,UNFEU,EXPLOSIONOUPRODUC-
TION DE PROTOXYDE DE CARBONE PEUT RÉSULTER LE
DOMMAGES CAUSER DE PROPRIÉTÉ, PERTE OU BLES-
SURE PERSONNELLE DE VIE. L'AGENCE QUALIFIÉE
DE SERVICE EST ESPONSABLE DE L'INSTALLATION
PROPRE DE CET ÉQUIPMENT. L'INSTALLATION N'EST
PAS PROPRE ET COMPLÉTE JUSQU'À L'OPÉRATION
DE L'APPAREIL CONVERTI EST CHÉQUE SUIVANT LES
CRITÈRES ÉTABLIS DANS LES INSTRUCTIONS DE PRO-
PRIÉTAIRE PROVISIONNÉES AVEC L'ÉQUIPEMENT.
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16
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Figure 28
Figure 29
Step 9. Reassemble all removed components
by reversing the procedures outlined in the
preceding steps. Use pipe joint compound or
Teflon tape on all pipe fittings before installing
(ensure propane resistant compounds are used
in propane applications, do not use pipe joint
compounds on are ttings).
Step 10. Attach the conversion label provided
in the conversion kit to the rating plate on the
appliance.
Step 11. Turn on gas supply and test for gas
leaks (see Step 6 on page 8.)
Step5. MillivoltSystems– Attach manometer
to the manifold side pressure test fitting and
verify manifold pressure reads 3.5 inches water
column (0.87 kPa) for natural gas, and 10.0
inches water column (2.49 kPa) for propane gas.
Step 6. See Figure 26 and remove the pilot
hood assembly to access the hexed pilot orifice.
Remove and replace the orifice with the one
provided with the kit.
When reinstalling the ignitor assembly, use
extreme care to prevent damage and break-
age. Do not apply any leverage to the ignitor
assembly while restoring the retainer clip to
its original position.
All Models
Step 8. Unscrew the orifice from the manifold
and replace it with the one provided with the
kit.See the following table for orifice sizes
for natural and propane models. Figure 29
illustrates the orifice.
Refer to Figure 27 and replace the pilot orifice
as follows: Remove the pilot hood assemble
to access the hexed polot ofifice.
Remove the pilot orifice and replace it with the
one provided with the conversion kit. Reinstall
the pilot assembly by reversing the steps
detailed here.
Pilot
Orifice
Pilot
Orifice
LSBV
Series Natural Propane
Orifice Size
3628 #26 #45
4228 #26 #45
Electronic Appliances
Step 7. SIT Electronic Valves - See Figure
28 and the instructions provided with the
kit. Remove the slotted cap screw, o-ring,
pressure-regulatingadjustingscrew andspring,
then discard.
Modify the pressure regulator from the kit.
Using a standard tin snip cutting tool, proceed
to trim shoulder off of the regulator.
Install new components and modified pressure
regulator from the kit.
Attachmanometer tothemanifoldsidepressure
testfittingandadjustscrewuntilpressurereads
3.5 inches water column (0.87 kPa) for natural
gas, and 10.0 inches water column (2.49 kPa)
for propane gas.
Modified Kit
Pressure Regulator
- After Trim
Remove
These
Components
SIT VALVE
Kit Pressure
Regulator - Before
Trim
Figure 26
Figure 27
Printed in U.S.A. © 2007 by Lennox Hearth Products
P/N 850042M REV. C 07/2010
Lennox Hearth Products reserves the right to make changes at any time, without notice, in design,
materials, specifications, and prices, and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.
1508 Elm Hill Pike, Suite 108 • Nashville, TN 37210
Gas Conversion Kits (continued)