Lennox Hearth LSM45EN-PV, LSM40EN-PV User Manual

INSTALLATION INSTRUCTIONS

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.

WARNING: If the information in these instructions
is not followed exactly, a fire or explosion may
result, causing property damage, personal injury,
or death.

WARNING /AVERTISSEMENT/AVISO

• HOT GLASS WILL CAUSE
BURNS.

• DO NOT TOUCH GLASS
UNTIL COOLED.

• NEVER ALLOW CHILDREN
TO TOUCH GLASS.

• 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.

• EL VIDRIO CALIENTE
CAUSARÁ QUEMADURAS.

• USTED DEBE NUNCA
TOCAR EL VIDRIO CALIENTE.

• LOS NIÑOS DEBEN NUNCA
TOCAR EL VIDRIO.

- Do not store or use gasoline or other flammable

vapors 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.

• If you cannot reach your gas supplier, call the fire

department.

- Installation and service must be performed by a
qualified installer, service agency or the gas supplier.

- Ne pas entreposer ni utilizer d’essence ni d’autres vapeurs
ou liquides inflammables dans le voisinage 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
installateur ou un service d’entretien qualifié ou par le
fournisseur de gaz.

Montebello® Power Vent
Direct-Vent Gas Fireplaces

P/N 506023-09 Rev. C 06/2011

This manual is one of a set of two supporting this product.
Refer to P/N

Ce manuel est disponible en francais, simplement
en faire la demande. Numéro de la pièce 506223-29.

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
plate. This appliance is not convertible for use with other gases unless a certified kit is used.

506025-02

for Care and Operation Instructions.

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
consultation ultérieure.

MODELS

LSM40EN-PV LSM45EN-PV

Portland

US

OTL Report No. 116-F-22-5

ELECTRONIC:

TM

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

TABLE OF CONTENTS

Packaging .........................................Page 2

Introduction ......................................Page 2

General Information ..........................Page 2

Massachusetts and New York

Requirements ................................ Page 4

Cold Climate Insulation .....................Page 5

Manufactured Home Requirements ..Page 5

Location ............................................Page 5

Vent Termination Clearances ............Page 6

Minimum Clearances to Combustibles Page 8

Detailed Installation Steps .................Page 9

Typical Installation Sequence ...........Page 9

Step 1. Framing ...............................Page 9

Fireplace and Framing Specifications Page 10

Step 2. Routing Gas Line ................Page 11

Proper Sizing of Gas Line .................. Page 11

Step 3. Install the Vent System .......Page 12

General Vent Information ..................Page 12

Power Vent Components...................Page 12

Vent Section Length Chart ................Page 13

Vertical (Offset) Installation...............Page 13

Vent Instructions A through G...........Page 14

Vent Figures ......................................Page 15

Horizontal Termination System .........Page 16

Installing Power Vent Termination ....Page 16

Step 4. Field Wiring .........................Page 18

Step 5. Removing Glass Door

Frame Assembly ...........................Page 20

Step 6. Connecting Gas Line ...........Page 21

Step 7 Install Firebox Liner ............Page 21

Step 8. Verifying Appliance

Operation ......................................Page 21

Step 9. Installing Logs ...................Page 22

Step 10. Installing Glass Door ..........Page 24

Step 11. Burner Adjustments ............Page 24

Finishing Requirements ....................Page 26

Step 12. Attaching Safety-in-

Operation Warnings .................

Installation Accessories ....................Page 28

Gas Conversion Kits .................. Page 29

Please read and understand these
instructions before beginning your

installation.

Page 27

PACKAGING

The assembled vented gas replace is pack­aged with:

BOX 1 - Fireplace:

• Envelope (in rebox) containing Care and

Operation Instructions, Installation Instruc-
tions, safety-in-operation warning labels,

and warranty.

• Bag of glowing embers and volcanic stone

• Pull screen

• Door modesty shield

• Adaptor with probe assembly

BOX 2 - Power Vent Components:

• (1) power vent termination

• (1) termination adaptor

• (1) horizontal restop assembly

• (1) vacuum hose

• (1) 11/32" hose clamp

• (1) strain relief

• (1) bushing

• (4) insulated 1/4" male terminals

• (2) #10 ring terminals

REQUIRED (order separately):

• One of the following brick liner kits:
a. Brick Liner Kit, Rustic
b. Brick Liner Kit, Herringbone
c. Brick Liner Kit, Old Cottage
d. Brick Liner Kit, Black.
e. Brick Liner Kit, Red Rustic
f. Brick Liner Kit, Red Herringbone

• One of the following log sets:

a. Birch Log set
b. Oak Log set

INTRODUCTION

These Electronic appliances are designed to
operate on natural gas or propane and have
an electronic intermittent pilot ignition system.

External 120 Volt AC electrical power is is

required to operate these units.

These vented gas fireplaces are sealed com-

bustion gas replaces designed for residential

applications.

Use Only These Approved Vent Components

- These fireplaces are designed, tested and
listed for operation and installation with, the
following (4-1/2" inner and 7-1/2" outer) vent
components only:

• Secure Vent™ Direct-Vent System Compo-

nents manufactured by Security Chimneys

International.

These approved vent system components are

labeled for identication. Do NOT use any other

manufacturer’s vent components with these
appliances.

GENERAL INFORMATION

WARNING

Young children should be care­fully supervised when they are
in the same room as the appli­ance. Toddlers, young children
and others may be susceptible
to accidental contact burns. A
physical barrier is recommended
if there are at risk individuals in
the house. To restrict access to
a fireplace 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

Les jeunes enfants devraient être
surveillés étroitement lorsqu’ils
se trouvent dans la même pièce
que l’appareil. Les tout petits,
les jeunes enfants ou les adultes
peuvent subir des brûlures s’ils
viennent en contact avec la sur­face chaude. Il est recommandé
d’installer une barrière physique
si des personnes à risques habi­tent la maison. Pour empêcher
l’accès à un foyer ou à un poêle,
installez une barrière de sécu­rité; cette mesure empêchera les
tout petits, les jeunes enfants et
toute autre personne à risque
d’avoir accès à la pièce et aux
surfaces chaudes.

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 infor­més des dangers que posent les températures
de surface élevées et se tenir à distance afin
d’éviter des brûlures ou que leurs vêtements
ne s’enflamment.

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.

2

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

WARNING

Improper installation, adjust­ment, 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.

WARNING

Failure to comply with these
installation instructions will result
in an improperly installed and
operating appliance, voiding its
warranty. Any change to this appli­ance and/or its operating controls
is dangerous.

WARNING

Clothing or other flammable
material should not be placed
on or near the appliance.

AVERTISSEMENT

On ne devrait pas placer de
vêtements ni d’autres matières
inflammables sur l’appareil ni à
proximité.

WARNING

Any safety screen or guard
removed for servicing the appli­ance must be replaced prior to
operating the appliance.

AVERTISSEMENT

Tout écran ou protecteur retiré
pour permettre l’entretien de
l’appareil doit être remis en
place avant de mettre l’appareil
en marche.

WARNING

Improper installation or use of
this appliance can cause serious
injury or death from fire, burns,
explosion or carbon monoxide
poisoning.

Note: Installation and repair should be done
by a qualified service person. The appliance
should be inspected before use and at least
annually by a professional service person.
More frequent cleaning may be required due
to excessive lint from carpeting, bedding
material, etcetera. It is imperative that control
compartments, burners and circulating air
passageways of the appliance be kept clean.

Remarque : L’installation et la réparation
devrait être confiées à un technicien qualifié.
L’appareil devrait faire l’objet d’une inspec­tion par un technicien professionnel avant
d’être utilisé et au moins une fois l’an par la
suite. Des nettoyages plus fréquents peuvent
être nécessaires si les tapis, la literie, et
cetera produisent une quantité importante de
pous-sière. Il est essentiel que les comparti­ments abritant les commandes, les brûleurs et
les conduits de circulation d’air de l’appareil
soient tenus propres.

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 utiliser cet appareil s’il a été plongé,
même partiellement, dans l’eau. Ap­peler un technicien qualifié pour inspecter
l’appareil et remplacer toute partie du
système de commande et toute commande
qui a été plongée dans l’eau.

Only trim kit(s) supplied by the manufacturer
shall be used in the installation of this ap­pliance.

Seules les trousses de garniture fournies
par le fabricant doivent être utilisées pour
l’installation de cet appareil.

These appliances comply with National Safety

Standards and are tested and listed by OMNI­Test Laboratories, Inc. (Report No. 116-F-22-5)
to ANSI Z21.50b in the USA, as vented gas

fireplaces.

These electronic appliances are listed by
OMNI-Test Laboratories for installation in
bedrooms and mobile homes.

Misc. Codes / Standards -

The Installation must conform to local codes.

In the absence of local codes, installation must

comply with the current National Fuel Gas Code,
ANSI Z223.1.

The appliance, when installed, must be elec­trically grounded in accordance with local

codes or, in the absence of local codes, with

the National Electrical Code, ANSI/NFPA 70 ­latest edition.

Provide adequate clearances around air open-

ings and adequate accessibility clearance for
service and proper operation. Never obstruct

the front openings of the appliance.

These appliances are designed to operate on
natural or propane gas only. The use of other
fuels or combination of fuels will degrade
the performance of this system and may be
dangerous.

These electronic appliances are manually
controlled and feature an electronic intermittent

pilot ignition system. External electrical power

is required to operate these units.

These electronic models come standard with a
manually-modulated gas valve; flame appear-

ance and heat output can be controlled at the
gas valve. The BTU Input for these appliances

is shown in Table 1.

Input (BTU/HR) - All Models

Model No. Input (BTU/Hr)

Natural Gas

LSM40EN-PV 32,500 to 42,000
LSM45EN-PV 32,500 to 42,000

Propane Gas (if field converted)

LSM40EN-PV field-

converted to propane

LSM45EN-PV field-

converted to propane

Table 1

30,000 to 40,500

30,000 to 40,500

3

HI

LO

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

Gas Pressure - All Models

Tables 2 and 3 show the appliances' inlet and
manifold gas pressure requirements:

Inlet Gas Supply Pressure

(all models)

Fuel # Minimum Maximum

Natural Gas

Propane

5.5" WC

(1.37 kPa)

11.0" WC

(2.74 kPa)

10.5" WC

(2.61 kPa)

13.0" WC

(3.23 kPa)

Table 2

Manifold Gas Supply Pressure

(all models)

Fuel # Low High

Natural

Gas

Propane

(Lo) 2.2" WC

(.55 kPa)

(Lo) 6.3" WC

(1.57 kPa)

(Hi) 3.5" WC

(.87 kPa)

(Hi) 10.0" WC

(2.49 kPa)

Table 3

Test gauge connections are provided on the
front of the gas control valve (identified IN for

the inlet and OUT for the manifold side). Refer

to Figure 1.

Propane tanks are at pressures that will cause
damage to valve components. Verify that the
tanks have step down regulators to reduce the
pressure to safe levels.

These appliances must be isolated from the
gas supply piping system (by closing their
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).

These appliances and their individual shut-off

valves must be disconnected from the gas

supply piping system during any pressure
testing of that system at pressures greater

than 1/2 psig (3.5 kPa).

These appliances must not be connected to a

chimney or flue serving a separate solid fuel

burning appliance.

PURGE CYCLE
This is a power vented fireplace that
requires household electrical power
to operate. It will not operate during
a power failure. When the fireplace
is turned off, the exhaust blower will
continue to operate for approximately
one to two minutes after shutdown
to expel the exhaust gases from the
venting system.

Orifice Sizes - Sea Level To High Altitude
(All Models)

These appliances are tested and approved for
installation at elevations of 0-2000 feet (0-610

meters) above sea level, using the standard
burner orice sizes (marked with an "*" in Table

4). For elevations above 2000 feet, contact your

gas supplier or qualified service technician.

Deration - At higher elevations, the amount

of BTU fuel value delivered must be reduced
by either:

• Using gas that has been derated by the gas

company.

• Changing the burner orice to a smaller size
as regulated by the local authorities having
jurisdiction and by the (USA) National Fuel
Gas Code NFPA 54/ANSI Z223.1 - latest
edition or, in Canada, the CAN/CSA-B149.1

codes - latest edition.

Install the appliance according to the regulations

of the local authorities having jurisdiction and,

in the USA, the National Fuel Gas Code NFPA

54 / ANSI Z223.1 - latest edition.

NOTE: Flame appearance will diminish 4% per
thousand feet.

Burner Orifice Size

Elevation 0-2000 ft. (0-610m)

Model Natural Gas Propane Gas

•

•

.073" (#49)

H7936 •

.073" (#49)

H7936 •

LSM40-PV

LSM45-PV

Table 4

.125" (1/8") *

H7924

.125" (1/8") *

H7924

* Standard size installed at factory

•Part/Cat.Number

Gas Valve Diagrams

See Figure 1 for gas valve diagram.

Gas Supply Inlet

Inlet Pressure
Gauge Port

Manifold
Pressure
Gauge Port

Gas Outlet to Burner

Hi / Lo
Variable Flame
Height
Adjustment

Pilot
Adjustment
Screw

Figure 1 - SIT Electronic Gas Valve

REQUIREMENTS FOR THE COMMON­WEALTH OF MASSACHUSETTS

These fireplaces are approved for installation in

the US state of Massachusetts if the following

additional requirements are met:

• Install this appliance in accordance with
Massachusetts Rules and Regulations 248
C.M.R.

• Installation and repair must be done by a
plumber or gas tter licensed in the Com­monwealth 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.

Massachusetts Horizontal Vent Requirements
In the Commonwealth of Massachusetts, hori-

zontal terminations installed less than seven
(7) feet above the finished grade must comply
with the following additional requirements:

• A hard wired carbon monoxide detector
with an alarm and battery back-up must be

installed on the floor level where the gas

replace is installed. The carbon monoxide
detector must comply with NFPA 720, be
ANSI/UL 2034 listed and be ISA certied.

• A metal or plastic identication plate must
be permanently mounted to the exterior of
the building at a minimum height of eight (8)
feet above grade and be directly in line with

the horizontal termination. The sign must

read, in print size no less than one-half (1/2)
inch in size, GAS VENT DIRECTLY BELOW.
KEEP CLEAR OF ALL OBSTRUCTIONS.

NEW YORK CITY, NEW YORK (MEA)

4

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Installation of these fireplaces are approved

for installation in New York City in the US state
of New York.

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

COLD CLIMATE INSULATION

For cold climate installations, seal all cracks

around your appliance with noncombustible

material and wherever cold air could enter
the room. It is especially important to insulate

outside chase cavity between studs and under
oor on which appliance rests, if oor is above

ground level. Gas line holes and other open-

ings should be caulked or stuffed with unfaced
berglass insulation.

If the replace is being installed on a cement
slab in cold climates, a sheet of plywood or
other raised platform can be placed underneath

to prevent cold transfer to the fireplace and into
the room. It also helps to sheetrock inside

surfaces and tape for maximum air tightness

and caulk firestops.

MANUFACTURED HOME
REQUIREMENTS

This appliance may be installed in an aftermarket

permanently located, manufactured home and

must be installed in accordance with the manu­facturer's instructions and the Manufactured

Home Construction and Safety Standard, Title

24 CFR, Part 3280, in the United States.

Cet appareil peut être installé cómme du matéri-

el d'origine dans une maison préfabriquée (É.U.
seulement) ou mobile et doit être installé selon
les instructions du fabricant et conformément
à la norme Manufactured Home Constructions
and Safety, Title 24 CFR, Part 3200 aux Unis.

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 doit être utilisé uniquement avec le
type de gaz indiqué sur la plaque signalétique.
Cet appareil ne peut être converti à d'autres gaz,
sauf si une trousse de conversion est utilisée.

CAUTION: Ensure that the cross mem­bers are not cut or weakened during
installation. The structural integrity of
the manufactured home floor, wall, and
ceiling / roof must be maintained.

CAUTION: This appliance must be
grounded to the chassis of the manu­factured home in accordance with local
codes or in the absence of local codes,
with the National Electrical Code ANSI /
NFPA 70 - latest edition.

Cross Corner

Application

Room Divider

Application

Recessed

Application

Island

Application

Fireplace

Flat

Application

Application

Flat on Wall

Horizontal
Termination

Figure 2 - Typical Installation

LOCATION

In selecting the location, the aesthetic and
functional 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 located out of traffic and away from
furniture and draperies (Figure 2).

En raison des températures élevées, l’appareil
devrait être installé dans un endroit où il y a
peu de circulation et loin du mobilier et des
tentures (Figure 2).

The location should also be free of electrical,
plumbing or other heating/air conditioning

ducting.

Note: When the unit is installed with one
side flush with a wall, the wall on the other
side of the unit must not extend beyond the
front edge of the unit.

Drywall

Top of Fireplace

Opening

Non-Combustible

Be aware that this is a heat producing ap­pliance. Objects placed above the unit are
exposed to elevated temperatures.

Do not insulate the space between the appli­ance and the area above it.

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

wood barrier covering the entire bottom surface
must be used.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

5

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

VENT TERMINATION CLEARANCES

These instructions should be used as a guide­line and do not supersede local codes in any
way. Install venting according to local codes,
these instructions, the current National Fuel
Gas Code (ANSI-Z223.1) in the USA.

Horizontal Vent Termination Clearances

The horizontal vent termination must have

a minimum of 3" (76 mm) clearance to any
overhead combustible projection of 2-1/2" (64
mm) or less (see Figure 3). For projections
exceeding 2-1/2" (64 mm), see Figure 4. For

additional vent location restrictions refer to
Figure 4 on Page 7.

Combustible Projection

2-1/2 inches or less in length

Greater than 2-1/2 inches in length

Ventilated or

Unventilated Soffit

See Figure 19 on Page 17 for the re­cess allowances, into exterior walls,
of the power vent terminations.

Combustible Projection

24"

(610mm)

Side Elevation View

Power Vent Termination

Combustible

Figure 3 - Horizontal Vent Termination Clearances

3"

(76mm)

18"

(457mm)

6

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS

NOTE: Local Codes Or Regulations May Require
Different Clearances.

NOTE: Location Of The Vent Termination Must Not
Interfere With Access To The Electrical Service.

H

3 ft.

X

l

A

3 ft.

M

I

V

K

Exterior Wall

Horizontal

Termination

B

V

L

= Air Supply Inlet

X

* See Item D in the Text Below.

24"

*18”

Inside Corner

Center Line

of Termination

36"

18”

DETAIL D

F

V

Ventilated Soffit

V

Fixed

Closed

Window

V

C

A

= Vent Terminal

V

Inside

Corner Detail

G

V

A

= 9" in U.S.

l

A

B

C

C

C

Operable

V

Window

B

B

= Area where Terminal is NOT permitted

B

l

A

J

E

D

V

X

Minimum Clearances US Installation **

A = Clearance above grade, veranda, porch, deck or balcony. 12 inches (30 cm) **
B = Clearance to window or door that may be opened. 6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW),

9 in. (23 cm) for appliances > 10,000 BTU/hr (3kW) and < 50,000 BTU/hr (15kW),
12 inches (30 cm) for appliances > 50,000 BTU/hr (15kW)*

C = Clearance to permanently closed window 9 inches (229 mm) recommended to prevent window condensation

D = Vertical clearance to ventilated soft located above the terminal within a horizontal

distance of 36 in. (91.4cm) from the center line of the terminal

E = Clearance to unventilated soffit 24 inches (61.0 cm)
F = Clearance to outside corner 5 inches (12.7 cm)
G = Clearance to inside corner 24 inches (61.0 cm)

H = Clearance to each inside of center line extended above meter / regulator assembly 3 feet (91 cm) within a height of 15 feet above the meter / regulator assembly **
I = Clearance to service regulator vent outlet 3 feet (91 cm) **

J = Clearance to non-mechanical air supply inlet to building or the combustion air inlet to

any other appliance

K = Clearance to mechanical air supply inlet 3 feet (91 cm) above, if within 10 feet (3 m) horizontally**
L = Clearance above paved sidewalk or paved driveway located on public property 7 feet (2.13 m) ‡
M = Clearance under veranda, porch, deck or balcony 18 in. (46.0 cm) ** ‡
** In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Codes - Latest Edition.
‡ A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves both dwellings.
*‡ Only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the oor.

24 inches (61.0 cm)

6 in. (15.2 cm) for appliances < 10,000 BTU/hr (3kW), 9 in. (23 cm) for appliances
> 10,000 BTU/hr (3kW) and < 50,000 BTU/hr (15kW), 12 inches (30 cm) for ap­pliances > 50,000 BTU/hr (15kW)*

Figure 4

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

7

5 (127)

8-1/4

(209)

14

(356)

12 (305)

19

(483)

2

(51)

4

(102)

6

(152)

8

(203)

10

(254)

12

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

MINIMUM CLEARANCES TO COMBUSTIBLES

Appliance And Vent Clearances

The appliance is approved with zero clearance to combustible materials

on all sides (as detailed in Table 5), with the following exception: When
the unit is installed with one side flush with a wall, the wall on the
other side of the unit must not extend beyond the front edge of the
unit. In addition, when the unit is recessed, the side walls surrounding

the unit must not extend beyond the front edge of the unit (see Figure
2 on Page 5).

APPLIANCE MINIMUM CLEARANCES* Inches (millimeters)

Sides 1/2 (13), 0 (0) Spacers **

Top Spacers 0 (0)

Floor 0 (0)
Back 1/2 (13), 0 (0) Spacers

Bottom of Appliance To Ceiling 69 (1743)

Vent 3 (76)

Top* / 1 (25.4) Sides & Bottom

SERVICE CLEARANCES Feet (meters)

Front 3 feet (0.9 meters)

Table 5

*Note: 3 in. (75 mm) above any horizontal/inclined vent component.

**Note: See Page 9, Step 1 for clearance requirements to the nailing
flange located at each side of the unit and any screw heads adjacent to it.

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 wood
barrier covering the entire bottom surface must be used.

Wall Finishes / Surrounds / Mantels

Note: Combustible wall finish materials and/or surround materials must
not be allowed to encroach the area defined by the appliance front face
(black sheet metal). Never allow combustible materials to be positioned
in front of or overlapping the appliance face. See Figure 6 and Figure
43 on Page 26.

Non-combustible materials, such as surrounds and other appliance trim,
may be installed on the appliance front face with these exceptions: they
must not cover any portion of the removable glass panel.

Vertical installation clearances to combustible mantels vary according
to the depth of the mantel (see Figure 5). Mantels constructed of non-
combustible materials may be installed at any height above the appliance

opening.

Mantel Depth

17 (432)

15 (381)

13 (330)

11 (279)

Distance from top of
appliance to bottom
of mantel

inches (millimeters)

Header

9 (229)

Top of
Appliance

7 (178)

Fireplace

(side view)

Figure 5 - Minimum Mantel Clearances

At 14" minimum side
wall clearance, a
combustible wall
can project to any
length.

At 8-1/4" side wall
clearance, a com­bustible wall can
project 12"

o

45

Protected wall shown in white

Top View of

Fireplace

Combustible Materials
Allowed In Shaded Area
“Safe Zone”

Combustible Walls
shown in dark gray

Combustible materials may
project beyond one side
of the fireplace opening
as long as they are kept
within the shaded areas
illustrated here.

Inches (millimeters)

17 (432)

Figure 6 - Minimum Distance to Unprotected Side Wall

NOTE: We recommend the use of high temperature paint (rated 175° F

or higher) on the underside of the mantel.

8

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

WARNING

Failure to position the parts in
accordance with these diagrams
or failure to use only parts specifi­cally approved with this appliance
may result in property damage or
personal injury.

AVERTISSEMENT

Risque de dommages ou de
blessures si les pièces ne sont
pas installées conformément à
ces schémas et ou si des pièces
autres que celles spécifiquement
approuvées avec cet appareil sont
utilisées.

DETAILED INSTALLATION STEPS

The appliance is shipped with all gas controls and
components installed and pre-wired. Remove

the shipping carton, exposing the front glass

door. Using a Phillips screwdriver, unfasten two

(2) screws located at the top of the glass frame

(see Figure 39 on Page 24). Tilt the top of the
glass frame away from the unit. Lift it carefully

off the bottom door track and set the door aside,

protecting it from inadvertent damage.

Step 3. (Page 12) Install the vent system and

exterior termination.

Step 4. (Page 18) Field Wiring
Connect 120 VAC electrical power to

the appliance receptacle.

Step 5. (Page 20) Remove glass door assem-

bly.

Step 6. (Page 21) Make connection to gas

supply.

Step 7. (Page 21) Install rebox liner kit.
Step 8. (Page 21) Verifying appliance opera-

tion.

Step 9. (Page 22) Install logs, volcanic stone

and glowing embers.

Step 10. (Page 24) Install glass door assembly.
Step 11. (Page 24) Adjust burner to ensure

proper flame appearance.

Step 12. (Page 27) Attach Safety in Operation

Warnings.

Step 1. FRAMING

Frame these appliances as illustrated in Figure
8 on Page 10, unless the appliance is to be

installed in a corner. See Figure 9 on Page 11
for corner framing installations. All framing
details must allow for a minimum clearance

to combustible framing members as shown in

Table 5 on Page 8.

If the appliance is to be elevated above oor
level, a solid continuous platform must be
constructed below the appliance.

Use Top Flange For
1/2” Thick Drywall

Front Of
Fireplace

Use Center Flange
For Flush Mount

Use Bottom Flange For
5/8” Thick Drywall

Left Side Front Corner of Fireplace Shown

(Right Side Requirements the Same)

Unit Being Secured By Its Nailing Flanges

To The Framing

Note: The nailing flanges, combustible members
and screw heads located in areas directly adjacent
to the nailing flanges, are EXEMPT from the 1/2”
clearance to combustible requirements for the
firebox outer wrapper. Combustible framing may be
in direct contact with the nailing flanges and may
be located closer than 1/2” from screw heads and
the firebox wrapper in areas adjacent to the nailing
flanges. Frame the opening to the exact dimensions
specified in the framing details of this manual.

Unit Being Secured by Its Nailing

Flanges to the Framing

Figure 7

TYPICAL INSTALLATION SEQUENCE

The typical sequence of installation is outlined

below. However, each installation is unique and
may result in variations to the steps described.

See the page numbers references in the follow-

ing steps for detailed procedures.

Step 1. (Page 9) Construct the appliance

framing. Position the appliance within
the framing and secure with nailing

brackets.

Step 2. (Page 11) Route gas supply line to

the right side.

Headers may be in direct contact with the
appliance top spacers but must not be sup­ported by them or notched to t around them.
All construction above the appliance must be

self-supporting, DO NOT use the appliance for
structural support.

The replace should be secured to the side
framing members using the unit's nailing
anges - one top and bottom on each side of

the fireplace front (see Figure 7). Use 8d nails
or their equivalent.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

9

E

A

B

D

Top View

Front View

5-3/32 (129)

Right Side View

14-1/8

8-1/2”
(216)

5-1/4”
(133)

(359)

26-15/32

(672)

C

25-29/32

(658)

25-1/2

(648)

7

2-1/2 (64)

(178)

19-5/8

(498)

Gas Inlet

(This

Side

Only)

Electrical

Inlet

8-3/8
(213)

F

G

H

J

8” / 11”

Vent / Intake

LENNOX HEARTH PRODUCTS • MONTEBELLO® POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS

A

B

C

VENT FRAMING

-

TOP VENT WITH 2 FEET
VERTICAL VENT AND
ONE 90° ELBOW

Framing should be constructed

of 2x4 or larger lumber.

Inches (mm)

(641)

25-1/4

1/2 A

10-1/2
(267)

7

(178)

5¹⁄₈

(130)

12-1/8

(308)

FIREPLACE AND FRAMING SPECIFICATIONS

Framing Dimensions

Model No. A B C *

LSM40-PV

LSM45-PV

* C = Adaptor Plus 4 Feet Vertical Vent (Min.) and 90° Elbow

in. 50-3/4 43 139-1/8

mm 1289 1092 3534

in. 56-7/8 48 144-1/8

mm 1445 1219 3661

Adaptor Plus 4
Feet Vertical
Vent (Min.)
and 90° Elbow

10

Figure 8

Model

LSM40-PV

LSM45-PV

No.

in. 50-5/8 37-1/4 42-7/8 25-5/16 34 37-5/8 33-3/32 29-9/32 34-3/4

mm 1286 946 1089 643 864 956 840 744 883

in. 56-11/16 42-1/4 47-7/8 28-3/8 40-1/8 43-5/8 38-3/32 34-1/2 40-59/64

mm 1440 1073 1216 721 1019 1108 968 876 1039

A B C D E F G H J

Fireplace Dimensions

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Vent Size

Co-axial DV

Vent Size

Diagrams, illustrations and photographs
are not to scale – consult installation
instructions. Product designs, materi­als, dimensions, specifications, colors
and prices are subject to change or
discontinuance without notice.

4-1/2" Inner
7-1/2" Outer

Notes