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

C

Back wall of chase/enclosure

(including any finishing materials)

D

A

B

Right Side
Front Corner
Of Fireplace
Framing

6-1/4”

(159 mm)

19-5/8”

(498 mm)

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

Model No. A B C D

LSM40-PV

LSM45-PV

in. 50-5/8 83-5/8 59-1/8 41-7/8

mm 1286 2124 1502 1064

in. 56-3/4 89-7/8 63-1/2 44-7/8

mm 1441 2283 1613 1140

Figure 9 - Corner Framing with Power Vent Termination

Step 2. ROUTING GAS LINE

Route a 1/2" (13 mm) gas line along the inside

of the right side framing as shown in Figure

10. Gas lines must be routed, constructed and

made of materials that are in strict accordance
with local codes and regulations.

All appliances are factory-equipped with a

exible gas line connector and 1/2 inch shutoff

valve. (See Step 6 on Page 21).

The incoming gas line should be piped into the

valve compartment and connected in one of the
two methods as shown in Figure 29 on Page 21.

Figure 10

Proper Sizing of Gas Line

Properly size and route the gas supply line
from the supply regulator to the area where the

appliance is to be installed per requirements

outlined in the National Fuel Gas Code, NFPA

54 - latest edition (USA).

Never use galvanized or plastic pipe. Refer
to Table 6 for proper sizing of the gas sup-

ply line, if black iron pipe is being used. Gas
lines must be routed, constructed and made

of materials that are in strict accordance with
local codes and regulations. We recommend

that a qualied individual such as a plumber or
gas tter be hired to correctly size and route

the gas supply line to the appliance. Installing
a gas supply line from the fuel supply to the
appliance involves numerous considerations of
materials, protection, sizing, locations, controls,
pressure, sediment, and more. Certainly no one
unfamiliar and unqualified should attempt sizing
or installing gas piping.

Schedule 40

Black Iron Pipe

Inside Diameter (Inches)

Schedule 40 Pipe

Length (feet)

0-10 1/2 3/8

10-40 1/2 1/2

40-100 1/2 1/2

100-150 3/4 1/2
150-200 3/4 1/2

Natural

Gas

Propane

Gas

Table 6

Notes:

• All appliances are factory-equipped with
a exible gas line connector and 1/2 inch

shutoff valve (see Figure 29 on Page 21).

• See Massachusetts Requirements on Page
4 for additional requirements for installations

in the state of Massachusetts in the USA.

• The gas supply line should Not be connected

to the appliance until Step 6 (Page 21).

• A pipe joint compound rated for gas should be
used on the threaded joints. Ensure propane

resistant compounds are used in propane
applications. Be very careful that the pipe

compound does not get inside the pipe.

• It is recommended to install a sediment
trap in the supply line as close as possible

to the appliance (see Figure 29 on Page 2).
Appliances using Propane should have a

sediment trap at the base of the tank.

• Check with local building ofcial for local
code requirements (i.e. are below grade
penetrations of the gas line allowed?, etc).

IMPORTANT: If propane is used, be aware that
if tank size is too small (i.e. under 100-lbs, if
this is the only gas appliance in the dwelling.
Ref. NPFA 58), there may be loss of pressure,
resulting in insufficient fuel delivery (which
can result in sooting, severe delayed ignition
or other malfunctions). Any damage resulting
from an improper installation, such as this,
is not covered under the limited warranty.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

11

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

Step 3. INSTALL THE VENT SYSTEM

General Information

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.

These fireplaces are designed, tested and
listed for operation and installation with,
and only with, Secure Vent™ (SV4.5) Direct­Vent System Components, manufactured by
Security Chimneys International. These ap­proved vent system components are labeled
for identification. DO NOT use any other
manufacturer's vent components with these
appliances.

Ensure clearances are in accordance with
local installation codes and the requirements
of the gas supplier.

Dégagement conforme aux codes d'installation
locaux et aux exigences du foumisseunde gaz.

Use only approved venting components. See
Approved Vent Components on Page 2.

Power Vent Components

Locate the replace as per the instructions in this manual. Make the following modications to
add the components used with the Power Vent Kits. This kit can only be used in conjunction with
“Direct-Vent” series electronic versions of Lennox™ Fireplaces. This installation must conform with
local codes or, in the absence of local codes, with the Natural Fuel Gas Code, ANSI Z223.1/NFPA 54.

CAUTION: This Power Vent Kit cannot be used with Millivolt appliances. Use kit only with
the Electronically controlled fireplaces listed for its use as shown in this document.

POWER VENT COMPONENTS

Item No. Part

Number
1 604187-01
2 601970-01 Vacuum Hose 1

3 601451-01 Termination Assembly 1
4 74L61 SV Termination Adaptor (SV4.5RCH) 1
5 102010-01 Strain Relief - 3/8” 1
6 H2246 Firestop Assembly (Horizontal) 1
7 102022-01
8 P-8-7102 Snap Bushing 1

Adaptor Assembly With Probe 1

Hose Clamp - 11/32” 2

Description Qty.

These fireplaces must be vented directly
to the outside.

The vent system may not service multiple

appliances, and must never be connected to a
ue serving a solid fuel burning appliance. The
vent pipe is tested to be run inside an enclosed
wall (such as a chase). There is no requirement

for inspection openings in the enclosing wall at

any of the joints in the vent pipe.

Venting System

With the appliance secured in framing, de-

termine vent routing and identify the exterior

termination location. The following sections
describe horizontal (exterior wall) vent applica­tions. A list of approved venting components

is shown on Page 28.

9 Ring Terminal - #10 2

10 Insulated 1/4” Male Terminal 4

1

2

5

7

4

6

8

8

9

3

12

Figure 11 - Power Kit Components

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

VENT SECTION LENGTHS

Determine the number of straight vent sections
required. 4-1/2" (114 mm), 10-1/2" (267 mm),
22-1/2" (572 mm), 34-1/2" (876 mm) and 46­1/2" (1181 mm) net section lengths are available.

Refer to the Vent Section Length Chart.

Vertical (Offset) Installation

Analyze the vent routing and determine the

quantities of vent sections and number of
elbows required. Refer to Figures 16 and 17

on Page 15 showing vent run requirements to
aid in selecting the type of vertical installation

desired. Vent sections are available in net lengths
of 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2"
(572 mm), 34-1/2" (876 mm) and 46-1/2" (1181
mm). Refer to the Vent Section Length Chart
for an aid in selecting length combinations.
Elbows are available in 90° and 45° congura-

tions. Refer to Figure 15 on Page 14 for the

SV4.5 E45 and SV4.5 E90 elbow dimensional

specifications.

Where required, a telescopic vent section

(SV4.5LA) may be used to provide the installer

with an option in installing in tight and confined

spaces or where the vent run made up of xed
length pieces develops a joint in a undesirable
location, or will not build up to the required
length. The SV4.5LA Telescopic Vent Section
has an effective length of from 1-1/2" (38 mm)
to 6-3/4" (171 mm). The SV4.5LA is tted with

a dimpled end (identical to a normal vent section

component) and a plain end with 3 pilot holes.

Slip the dimpled end over the locking channel

end of a standard SV4.5 vent component the

required distance and secure with three screws.

Maintain a minimum 1" (25 mm) clearance
to combustible materials for all vertical ele­ments. Clearances for all horizontal elements
are 3" (76 mm) on top, 1" (25 mm) on sides
and 1" (25 mm) on the bottom.

Table 7

Effective Vent Length

Model Effective Length

SV4.5L6 4-1/2"
SV4.5L12 10-1/2"
SV4.5L24 22-1/2"
SV4.5L36 34-1/2"
SV4.5L48 46-1/2"

Note: Convert inches into metric equivalent
measurement, as follows:

Millimeters (mm) = Inches x 25.4
Centimeters (cm) = Inches x 2.54
Meters (M) = Inches x .0254

13

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

7-5/8”

(194 mm)

4-13/16

(122 mm)

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

A. Frame ceiling opening - Use a plumb line
from the ceiling above the appliance to locate

center of the vertical run. Cut and/or frame an

opening, 10-1/2" x 10-1/2" (267 mm x 267
mm) inside dimensions, about this center mark

(Figure 12).

10-1/2" Min.

(267 mm)

Plumb Bob

Ceiling Framing

Figure 12

B. Attach adaptor (with probe) to appliance
collar. Secure Vent™ SV4.5 direct-vent

system components are unitized concentric
pipe components featuring positive twist lock
connections (see Figure 13).

All of the appliances covered in this document
are fitted with collars having locking inclined
channels. The dimpled end of the adaptor fits
over the appliance collar to create the positive
twist lock connection.

Align the dimple (four places) of the
upper vent section with the opening
of the locking incline channel on
the lower vent section or appliance
collar. Twist vent component clock­wise to engage and seal until arrow

Arrow

Adaptor on Appliance Collar
or Vent Section

and dimple align.

Dimple

Locking Incline
Channel

Connected Vent
Sections

Figure 13

To attach a vent component to the adaptor on
appliance collar, align the dimpled end over the

adaptor collar, adjusting the radial alignment

until the four locking dimples are aligned with the
inlet of the four inclined channels on the collar
(refer to Figure 13). Push the vent component
against the collar until it fully engages, then twist
the component clockwise, running the dimples
down and along the incline channels until they
seat at the end of the channels.

14

10-1/2" Min.

(267 mm)

Arrow

The unitized design of the Secure Vent com-

ponents will engage and seal both the inner

and outer pipe without the need for sealant or

screws. If desired a #6 x 1/2" screw may be
used at the joint, but it is not required as the

pipe will securely lock when twisted.
C. Attach vent components to each other - Other

vent sections may be added to the previously

installed section in accordance with the require­ments shown in Figures 16 and 17 on Page 15.

To add another vent component to a length of
vent run, align the dimpled end over the inclined
channel end of the previously installed section,

adjusting the radial alignment until the four

locking dimples are aligned with the inlets of
the four incline channels of the previous section.

Push the vent component against the previ­ous section until it fully engages, then twist
the component clockwise running the dimples
down and along the incline channels until they
seat at the end of the channels. This seating

position is indicated by the alignment of the
arrow and dimple as shown in Figure 13.

D. Install firestop/spacer at ceiling - When

using Secure Vent, use SV4.5VF restop/spacer
at ceiling joists. If there is living space above
the ceiling level, the restop/spacer must be
installed on the bottom side of the ceiling. If
attic space is above the ceiling, the restop/
spacer must be installed on the top side of the
joist. Route the vent sections through the framed

opening and secure the firestop/spacer with
8d nails or other appropriate fasteners at each
corner. Remember to maintain 1" (25 mm)

clearance to combustibles, framing members,
and attic or ceiling insulation when running
vertical chimney sections. Attic insulation
shield (H3907) may be used to obtain the
required clearances indicated here. See
installation accessories on Page 28. The gap
between the vent pipe and a vertical firestop
can be sealed with non-combustible caulking.

E. Support the vertical vent run sections -

Blocking

Support Straps
(Plumber's
tape)

8 feet (2.4 m)

Maximum

1/2 inch (13
mm) minimum
clearance to
combustibles

Figure 14

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Note - Proper venting support is very important.
The weight of the vent must not be supported
by the fireplace in any degree.

Support the vertical portion of the venting

system every 8 feet (2.4 m) above the replace
vent outlet. One method of support is by utiliz-

ing field provided support straps (conventional

plumber's tape). Secure the plumber's tape to
the framing members with nails or screws. Strap

the tape around the vent, securing the ends of
the tape to the framing. If desired, sheet metal

screws #6 x 1/2" length may be used to secure

the support straps to the vent pipe.

F. Change vent direction to horizontal/inclined
run - At transition from or to a horizontal/in-

clined run, install the SV4.5 E45 and SV4.5 E90
elbows in the same manner as the straight vent
sections. The elbows feature a twist section to
allow them to be routed about the center axis

of their initial collar section to align with the

required direction of the next vent run element.

Twist elbow sections in a clockwise direction
only so as to avoid the possibility of unlocking
any of the previously connected vent sections
(see Figures 13 and 15).

8-1/8"

(206 mm)

Swivel Joint

(360° swivel)

SV4.5E45

45° Elbow)

Swivel Joint

(360° swivel)

SV4.5E90

90° Elbow)

Figure 15

G. Continue installation of horizontal/inclined
sections - Continue with the installation of the

straight vent sections in horizontal/inclined run

as described in Step C. Install support straps
every 3' (914 mm) along horizontal/inclined vent
runs using conventional plumber’s tape (see

Page 15, Figure 16). It is very important that
the horizontal/inclined run be maintained in a
straight (no dips), slightly elevated plane. The
recommended incline is approximately 1/4"
per foot (20 mm per meter) horizontal, in a
direction away from the fireplace. The rise per

foot run ratios that are smaller are acceptable all

the way down to at or near level. Use a carpen­ter’s level to measure from a constant surface

and adjust the support straps as necessary.

It is important to maintain the required clear­ances to combustibles: 1" (25 mm) at all sides
for all vertical runs; and 3" (76 mm) at the top,
1" (25 mm) at sides, and 1" (25 mm) at the
bottom for all horizontal/inclined runs.

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

VENT FIGURES

Notes:

• SecureVent™ components (rigid vent pipe and terminal) are shown in the Figures.

• Two 45 degree elbows may be used in place of one 90 degree elbow.

• SV4.5VF (Secure Vent) firestop/spacer must be used anytime vent pipe passes through a combustible floor or ceiling. SV4.5HF (Secure Vent)

firestop/spacer must be used anytime vent pipe passes through a combustible wall.

• It is very important that the horizontal/inclined run be maintained in a straight (no dips), slightly elevated plane. The recommended incline
is approximately 1/4" per foot (20 mm per meter) horizontal, in a direction away from the fireplace. The rise per foot run ratios that are smaller

are acceptable all the way down to at or near level.

Power Vent
Termination

Exterior
Wall

SV4.5L 6 / 12 / 24 / 36 / 48

Vent Sections

Horizontal / Inclined Run

Figure 16 - Typical Power Vent Routing

Firestop / Spacer

Maximum Horizontal

Venting 110 Feet.

Up to 6 Elbows

Floor

Support
Brackets

Ceiling

Probe Adaptor
(required)

Building
Support
Framing

SV4.5E90
Elbow

Vertical Rise

66 Feet Max.

4 Feet Min.

Fireplace

Minimum
Vent Run

Horizontal

10 Feet

Probe Adaptor

(required)

Exterior
Wall

Power Vent
Termination

POWER VENT VENTING CHART

Maximum Number Of Elbows - 6

Maximum Feet Of Run

Minimum Horizontal Run B 10 feet

Minimum Vertical Run A

Maximum Vertical Rise A

A + B 110 feet

Adaptor Plus 4 Feet Vertical

Vent (Min.) and 90° Elbow

MINIMUM CLEARANCES TO COMBUSTIBLES

Vertical Vent Pipe 1.0 in. (25.4 mm)

Horizontal Vent Pipe

Top - 3.0 in. (76.2 mm)

Sides - 1.0 in. (25.4 mm)

Bottom - 1.0 in. (25.4 mm)

Figure 17

A

66 feet

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

(See Chart)

B

Probe Adaptor

(Required)

15

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

HORIZONTAL (OUTSIDE WALL)
TERMINATION SYSTEM

See Figures 16 and 17 on Page 15 illustrating
the various horizontal venting configurations

that are possible for use with these appliances.
The table in Figure 17 on Page 15 shows each
system’s minimum and maximum vertical and
horizontal length values that can be used to

design and install the vent components in a
variety of applications.

The horizontal vent system terminates through

an outside wall. Building Codes limit or prohibit

terminating in specific areas. Refer to Figure 4
on Page 7 for location guidelines.

Secure Vent™ SV4.5 direct-vent system com-
ponents are unitized concentric pipe compo­nents featuring positive twist lock connection,
(refer to Figure 13 on Page 14). All of the
appliances covered in this document are fitted
with collars having locking inclined channels.
The dimpled end of the vent components fit
over the appliance collar to create the positive
twist lock connection.

A. Plan the vent run -
Analyze the vent routing and determine the

types and quantities of sections required

4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2"
(572 mm), 34-1/2" (876 mm) and 46-1/2"
(1181 mm) net section lengths are available.
Make allowances for elbows as indicated in

Figure 15 on Page 14.

Maintain a minimum 1" (25 mm) clearance

to combustibles on the vertical sections.
Clearances for the horizontal runs are; 3"
(76 mm) on top, 1" (25 mm) on sides, and
1" (25 mm) at the bottom.

B. Frame exterior wall opening -

Locate the center of the vent outlet on the

exterior wall according to the dimensions

shown in Figure 8 on Page 10.

Cut and/or frame an opening, 10-1/2" x 12-

1/8" (267 mm x 308 mm) inside dimensions,
about this center.

C. Frame ceiling opening - If the vertical route is

to penetrate a ceiling, use plumb line to locate
the center above the appliance. Cut and/or
frame an opening, 10-1/2" x 10-1/2"(267
mm x 267 mm) inside dimensions, about

this center (refer to Figure 12 on Page 14).

D. Attach vent components to appliance - To

attach a vent component to the appliance
collar, align the dimpled end over the collar,

adjusting the radial alignment until the four

locking dimples are aligned with the inlets of
the four incline channels on the collar (refer
to Figure 13 on Page 14).

Push the vent component against the collar

until it fully engages, then twist the compo­nent clockwise, running the dimples down
and along the incline channels until they
seat at the end of the channels. The unitized
design of the Secure Vent components will

engage and seal both the inner and outer pipe

elements with the same procedure. Sealant
and securing screws are not required.

E. Attach vent components to each other -

Other vent sections may be added to the

previously installed section in accordance

with the requirements of the vent tables.

To add another vent component to a length
of vent run, align the dimpled end of the
component over the inclined channel end of

the previously installed section, adjusting the

radial alignment until the four locking dimples
are aligned with the inlets of the four incline
channels of the previous section. Push
the vent component against the previous
section until it fully engages, then twist the
component clockwise running the dimples
down and along the incline channels until they
seat at the end of the channels. This seating

position is indicated by the alignment of
the arrow and dimple as shown in Figure
13 on Page 14.

F. Install firestop/spacer at ceiling -

When using Secure Vent, use SV4.5VF re-

stop/spacer at ceiling joists. If there is living
space above the ceiling level, the restop/
spacer must be installed on the bottom side
of the ceiling. If attic space is above the ceil­ing, the restop/ spacer must be installed
on the top side of the joist. Route the vent

sections through the framed opening and
secure the firestop/spacer with 8d nails or
other appropriate fasteners at each corner.

Remember to maintain 1" (25 mm) clear-

ance to combustibles, framing members,
and attic or ceiling insulation when running
vertical chimney sections.

G. Support the vertical run sections -

On the vertical run, support the venting

system every 8 feet (2.4m) above the re­place vent outlet with field provided support
straps (Plumber's tape). Attach the straps
to the vent pipe and secure to the framing

members with nails or screws.

H.Change vent direction - At transition from

or to a horizontal/inclined run, install the

SV4.5E45 and SV4.5E90 elbows in the same

manner as the straight vent sections. The

elbows feature a twist section to allow them
to be routed about the center axis of their

initial collar section to align with the required

direction of the next vent run element. Twist
elbow sections in a clockwise direction only
so as to avoid the possibility of unlocking
any of the previously connected vent sec­tions (see Figure 13 on Page 14).

I. Continue installation of horizontal/inclined

sections - Continue with the installation

of the straight vent sections in horizontal/

inclined run as described in Step E. Install
support straps every 3 feet (1914 mm)

along horizontal/inclined vent runs using

conventional plumber’s tape.

See Figure 16 on Page 15. It is very im-

portant that the horizontal/inclined run be
maintained in a straight (no dips), slightly
elevated plane. The recommended incline
is approximately 1/4" per foot (20 mm per
meter) horizontal, in a direction away from
the fireplace. The rise per foot run ratios that

are smaller are acceptable all the way down

to at or near level. Use a carpenter’s level to

measure from a constant surface and adjust

the support straps as necessary.

Installing Power Vent Termination

J. Assemble vent run to exterior wall - If not

previously measured, locate the center of

the vent on the exterior wall. Prepare an
opening as described in this manual. As­semble the vent system to a point where

the terminus of the last section is within 8
inches of the outside wall surface where

the power vent is to be mounted (refer to

Figure 19 on Page 17).

If the terminus of the last section is not

within this distance, use the telescopic
vent section SV4.5LA, as the last vent
section. For wall thicknesses greater than
that shown in Figure 19 (Page 17), refer to
Table 8 (Page 17) for the additional vent­ing components needed (in addition to the

termination and adaptor) for a particular

range of wall thicknesses.

K. Attach termination adaptor - Attach the

adaptor (adaptor - SV4.5RCH - provided
with the power vent kit) to the vent section
telescoping vent section, or elbow, as shown

in Figures 18 and 19 (Page 17) in the same

manner as any SV4.5 vent component.

16

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

L. Install Firestop/Spacer at exterior wall -

Install SV4.5HF Firestop/Spacer, provided

with the power vent kit, over the opening at
the exterior side of the framing, long side
up, with the 3 inch spacer clearance at the
top as shown in Figure 18, and nail into
place.

(The Firestop/Spacer may also be installed

over the opening at the interior side of the

framing).

M. Install the Power Vent termination - For

the last step, from outside the exterior wall,

slide the collars of the termination onto the
adaptor (the outer inside the outer and the

inner outside the inner) until the termina­tion seats against the exterior wall surface
to which it will be attached. Orient the

housing of the termination with the arrow
pointed upwards. Secure the termination

to the exterior wall. The termination must
not be recessed into the exterior wall or
siding by more that the 1-1/4” (32 mm) as

shown in Figure 19.

The Power Vent termination has been
designed to perform in a wide range of
weather conditions. Our terminations meet
or exceed industry standards.

When selecting the location of your ter­mination, do not place the termination
where water from eaves and adjoining
roof lines may create a heavy flow of
cascading water onto the terminations. If
the termination must be placed where the
possibility of cascading water exists, it is
the responsibility of the builder to direct
the water away from the termination cap
by using gutters or other means.

Take care to carefully follow the Installation
Instructions for the termination, including
the use of silicone caulking where required.

Firestop/Spacer (SV4.5HF) shown

on the exterior side of the wall. It

may also be installed on the

interior side.

7"

5-1/8"

(130 mm)

(178)

12-1/8"

(308 mm)

Adapter

SV4.5RCH

6 to 48 inch Vent Section,

Telescopic vent section,

10-1/2"

(267 mm)

Note: Centerline of Vent Piping is

NOT the Same as the Centerline of

the Frame Opening.

See Figure 8 on Page 10 for Minimum
Distance to Base of Appliance

Base of Appliance

Figure 18 - Installing Power Vent Horizontal Termination

*Use silicone caulking to
seal the top and sides of
the termination, up to the
underlayment, stucco, or
masonry wall surface.

*Caulk

*Caulk

Stucco

Siding

**For thicknesses greater
than 9-1/4”, see Table 8

Interior Surface of

Finished Wall

Maximum Extent of Vent Run
Sections Relative to Exterior
Surface of Framing

Last Vent Section.

Use Telescopic Vent

Section (SV4.5LA),

If Necessary

Power Vent

Termination

Adapter

SV4.5RCH

Power Vent

Termination

3"

(76 mm)

1"

(25.4 mm)

Maximum wall thickness

9-1/4 in.(235 mm)**

Exterior Surface of Siding

Exterior Surface of

Framing

6 in. to 9-1/4 in.

(152 to 235 mm)**

Power Vent

Termination

1-1/4" Maximum Re cess of
the Sq uare Termination into
Exterior Fi ni sh in g M ateria l

See Table 8 as an aid in venting component
selection for a particular range of exterior
wall thicknesses.

IMPORTANT: The vent termination is hot
while in operation and for a period of
time following the use of the fireplace.
Young children should be carefully
supervised when they are in the same
area as a hot termination.

Venting Connection and Exterior Wall Recessing

of the Power Vent Horizontal Termination

Figure 19

Venting Components Required for Various Exterior

Wall Thicknesses, When Using The Power Vent Termination

Vent Components Required Exterior Wall Thickness - inches (mm)

Termination Kit Only 6 to 9-1/4 (152 to 235)
Termination Kit and 6 In. Vent Section

(SV4.5L6)
Termination Kit and 12 in. Vent Section

(SV4.5L12)
Termination Kit and Telescopic Section

(SV4.5L12)

10-3/4 to 14 (273 to 356)

16-3/4 to 20 (426 to 508)

11-3/4 to 20 (299 to 508)

Table 8

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

17

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

Step 4. FIELD WIRING

CAUTION: Label all wires prior to disconnection when servic­ing controls. Wiring errors can cause improper and dangerous
operation.

ATTENTION: Au moment de l'entretien des commandes, étiquetez
tous les fils avant de les débrancher. Des erreurs de cáblage
peu-vent entraîner un fonctionnement inadéquat et dangereux.

Verify proper operation after servicing.

S'assurer que l'appareil fonctionne adé-quatement une fois
l'entretien terminé.

CAUTION: Ground supply lead must be connected to the wire
attached to the green ground screw located on the outlet box.
See Figures 26 and 27 on Page 20. Failure to do so will result
in a potential safety hazard. The appliance 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.

Route Wiring

NOTE: Electrical wiring must be performed by a qualified electrician.

• Install the strain relief in the hole provided on the right side of replace

for the electrical wiring (refer to Figure 20).
Standard Instruction (For use when access to the termination is dif-

cult because of height or other reasons).

• Locate a locally procured electrical junction box within reach of the

termination wiring pigtail (refer to Figure 22 on Page 19) and route

the pigtail to the junction box as the termination is installed.

• Route 14 gauge AWG grounded Romex wiring (not provided) from
the replace to the just installed junction box close to the termina­tion. Ensure the wiring is safety plated to prevent damage by framing

nails and finish drywall screws. Route the wire into the lower control

compartment and cut to length before installing the terminals. Install
provided wiring hardware on the ends of the Romex wire.

• Refer to Figure 24 on Page 19 and install the electrical hardware
on the ends of the Romex wiring. Male terminals on the Black and

White wires, and ring terminals on the ground wire.

• Using standard electrical practices and the terminals provided, con­nect the three wires of the Romex cable to the termination pigtail
within the Electrical junction box. Ensure ground.

• The replace end of the Romex will be addressed in Connecting The

Power Vent To The Fireplace Control System.

Probe (1 *)

Hose Clamp (7 *)

Vacuum Hose (2 *)

Adaptor Assembly

* See Figure 11 on Page 12

Figure 21A - Vacuum Hose Connection To Probe

Vacuum Hose

Pressure Switch

18

Strain
Relief

14 Gage
Grounded
Romex

Vacuum
Hose

Snap
Bushing

Wall Switch
Harness

Figure 20

Pressure switch is located
behind the panel on the right
side of firebox

Right Side

of Fireplace

Firebox

Vacuum Hose

Junction Box

Pressure Switch

Figure 21B - Vacuum Hose Connection To Pressure Switch

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Wiring - Fireplace (See Figures 26 and 27 on Page 20)

Note: These electronic appliances must be connected to the main power

supply. The gas valve is set in place and pre-wired at the factory.

1. Route a 3-wire 120Vac 60Hz 1ph power supply to the appliance junc-

tion box.

2. Remove the electrical inlet cover plate from the side of the unit by remov-

ing the plate's securing screws (see Figure 8 on Page 10).

3. Remove the cover plate's knockout and then feed the power supply wire

through the knockout opening and into the unit junction box.

4. Connect the black power supply wire to the power outlet's red pigtail lead
and the white power supply wire to the common terminal of the outlet as
shown in Figures 26 and 27 on Page 20.

5. Connect the ground supply wire to the pigtail lead attached to outlet's
green ground screw.

6. Appliance-mounted ON/OFF burner control switch (rocker switch) is

factory installed. Optional wall-mounted switch, or one of the optional

remote control kits may also be used.

7. If wall-mounted ON/OFF control is to be used, mount it in a convenient

location on a wall near the fireplace.

8. If an optional control is to be used, wire it in the low voltage circuit (see

Figure 26 on Page 20).

Note: The supplied 15 feet of 2 conductor wire has one end of each

conductor connected in parallel with the appliance mounted ON/OFF
burner control switch and the other end of each conductor placed on
top of the unit.

CAUTION: Do Not connect the optional wall switch to a 120V power
supply.

• Refer to Figure 26 and install the electrical hardware on the fireplace
end of the Romex wiring. Male terminals (#10) on the Black and White
wires, and ring terminals (#9) on the ground wire. The termination
end of the Romex will be connected to the termination with wire nuts
(not provided).

• Refer to Figure 25 to connect the three wires of the Romex cable to
the termination. Ensure the ground ring terminal is grounded beneath
a structural screw as shown. Attach the junction box cover to the

termination with the screw previously removed.

• The replace end of the Romex will be addressed in Connecting The
Power Vent To The Fireplace Control System.

Black and White

Romex

Ground Wire

10

9

Figure 23 - Romex

9. If an optional control switch is installed, turn the appliance-mounted

ON/OFF burner control switch to the OFF position.

10.After the wiring is complete, replace the cover plate.

Wiring - Power Vent Termination

Alternate Instructions (For use when access to the termination is easy

and a secondary electrical junction box installation is not desired).

• Remove the junction box cover from the termination by removing the

attaching screw (refer to Figure 22).

• Loosen the strain relief on the termination shown in Figure 22. Pull
the pigtail in and shorten it to t within the junction box cover.

• Route 14 gauge AWG grounded Romex wiring (not provided) from
replace to the J-Box at the termination. Ensure the wiring is safety
plated to prevent damage by framing nails and nish drywall screws.

Route the wire into the lower control compartment and cut to length

before installing the terminals. Install provided wiring hardware on the
replace end of the Romex wire.

Strain Relief

Romex Wire

Figure 24 - Back Of Termination

Pigtail Wires Cut

Off And Shortened

Ground Romex To
The Termination

Pigtail

Junction Box Cover

Figure 22 - Bottom Of Termination

Attaching Screw

Figure 25 - Junction Box Cover Removed

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Strain Relief Holding Romex

Wire Nuts

19

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

J-BOX/RECEPTIACLE

WIRING

120V, 60HZ, 1PH

Factory Wired

Field Wired

Junction Box

Tab Intact

Tab
Intact

n e e r G - d n u o r G

e t i h W - l a r

t
u e N

120 VAC - Black

Green
Ground
Screw

White

Green

Neutral
Side of
Receptacle

Hot
Side of
Receptacle

Black

Pilot Burner
Igniter-Sensor
Assembly

Connector

Blue (20)

Ground

Green (12)

Purple (9)

Electronic Ignition

Control Board

White (6)

EV2 EV1

White (20)

Orange (20)

Black (20)

Green LED

Gas Valve

Item 45
Wire #2

Junction Box

Black

White

White (6)

Appliance Mounted

On/Off Switch

Wall-Mounted On/Off Switch (optional)

120 VAC

Transformer

120 V.

24 V.

Item 32 Wire #3

Black

White
Ground

Black (16)

Pressure

Red

Switch

Red

Black

Black

Field Installed

Exhaust
Blower
Control
Module

N/A

Item 63

Exhaust

Blower

Blower

(Field Installed)

To Igniter
Module

20

Figure 26 - Electronic Wiring Diagram

Figure 27- J-BOX WIRING

Step 5. REMOVING GLASS DOOR
ASSEMBLY

WARNING

• Handle this glass with extreme
care! Glass is susceptible to
damage – Do not scratch or
handle roughly while reinstall­ing the glass door frame.

• Do not attempt to substitute the
materials used on this door,
or replace cracked or broken
glass with any materials other
than those provided by the
appliance manufacturer.

• The glass door of this appli­ance must only be replaced
as a complete unit as provided
by the manufacturer. Do not
attempt to replace broken,
cracked or chipped glass
separately.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Refer to Figure 39 on Page 24 and remove the
front glass door assembly as follows:

To remove the firescreens, lift up the center of

the rod to disengage it from the center bracket,
bend down at center, hold left side with hand
until it disengages from left side, being careful

not to scratch paint. Slowly remove the rod
from the right side.

Using a Phillips screwdriver, unfasten two (2)

screws located at the top of the glass frame.

Tilt the glass frame at the top away from the

unit. Lift it carefully off the bottom door track

and set the door aside, protecting it from inad­vertent damage.

Gas
Valve

3/8" NPT x

Flare Fitting

3/8" Flex Tubing

3/8" Nipple

3/8" Union

3/8" Close
Nipple

3/8" Shut-off Valve

1/2" x 3/8"

Reducer

Gas

Stub

1/2" x 3/8" Flare

Shut-off Valve

Gas Solid Line Connector

Gas Flex Line Connector

*Sediment
Trap

3"

Min

ELECTRONIC

Flame

Sensor

Hood

Igniter Rod

Pilot
Nozzels

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

Step 6. CONNECTING GAS LINE

All codes require a shut-off valve mounted in
the supply line. The orientation of the shut-off
valve should face the front. Figure 29 il­lustrates two methods for connecting the gas
supply. A Sediment Trap is recommended to

prevent moisture and debris in gas line from

damaging the valve.

The ex-line method is acceptable in the U.S.A

where local codes permit. Installation must be
in compliance with local codes. These appli-

ances are equipped with a gas ex-line for use

in connecting the unit to the gas line.

See Figure 29 for ex-line description. The ex-

line is rated for both natural and propane gas.

A manual shut off valve is also provided with

the ex-line. The gas control valve is located

on the right side of the unit.

When using solid gas line connector, access

the valve by removing the front door assembly

on the valve access side and the access plate
(refer to Figure 28).

The electronic control valve has a 3/8" (10 mm)

NPT thread gas supply inlet.

Secure all joints tightly using appropriate
tools and sealing compounds (ensure propane
resistant compounds are used in propane
applications).

Turn on gas supply and test for gas leaks using a

gas leak test solution (also referred to as bubble
leak solution).

Note: Using a soapy water solution is an

effective leak test solution but it is not recom­mended, because the soap residue that is left
on the pipes/fittings can result in corrosion
over time.

A. Light the appliance (refer to the lighting

instructions label in control compartment

or in the Care and Operation instructions

manual).

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 (off/pilot/on) to the

“OFF” position. Either tighten or refasten the

leaking connection, then retest as described
above.

C. When the gas lines are tested and leak free

be sure to rinse off the leak testing solution.

D. Re-install the access plate, making certain

the gasket has not been damaged.

Step 7. INSTALL FIREBOX LINER KIT

Install the rebox liner kit per the instructions
provided in kit (ref form # 750182M).

Note: The gas supply line
must be installed in accor­dance with building codes
by a qualified installer
approved and/or licensed
as required by the locality.
In the Commonwealth of
Massachusetts, installation
must be performed by a
licensed plumber or gas
fitter.

Bring the shutoff valve on the end of the ex-line

over to the hard pipe and tighten with wrenches

from above through the rebox opening.

Right Side

Modesty Panel

Access Plate

Extension Knob

ON/OFF Switch

Hi-Lo

Gas Valve

Figure 28

TEST ALL CONNECTIONS FOR GAS LEAKS
(FACTORY AND FIELD):

WARNING

Never use an open flame to
check for leaks.

Figure 29 - GAS CONNECTION

Step 8. VERIFYING APPLIANCE OPERA­TION

Turn on burner then observe the individual
tongues of ame on the burner. Make sure

all ports are open and producing flame evenly

across the burner. If any ports are blocked, or
partially blocked, clean out the ports.

With gas line installed run initial system check-

out before closing up the front of the unit.

Follow the pilot lighting instructions provided.

Note: Lighting Instructions are also found on
the literature tag tied to the bracket above the
gas valve. To access the tag, reach into the
right side opening.

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. Subsequent lighting

of the appliance will not require such purging.
Inspect the pilot flame (remove logs, if neces-

sary, handling carefully).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Electronic Appliance Checkout

To light the burner, turn ‘ON’ the optional remote

wall switch or turn the appliance mounted ON/
OFF switch to the “ON” position. Ensure the
igniter lights the pilot. The pilot flame should
engulf the flame sensor as shown in Figure 30.

Figure 30

21

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

Step 9. INSTALL VOLCANIC STONE, GLOWING EMBERS AND
LOGS

WARNING

• DO NOT attempt to install the logs until the

appliance installation has been completed, the
gas line connected and tested for leaks and the
initial burner operation has been checked out.
The size and position of the log set was engi-

•

neered to give the appliance a safe, reliable
and attractive flame pattern. Any attempt to use
a different log set in the fireplace will void the
warranty and will result in incomplete combus­tion, sooting, and poor flame quality.
Logs get very hot and will remain hot up to one

•

hour after gas supply is turned off. Handle only
when logs are cool. Turn off all electricity to
the appliance before you install grate, volcanic
stone, embers and logs.
This appliance is not designed to burn wood.

•

Any attempt to do so could cause irreparable
damage to the appliance and prove hazardous
to your safety.
If logs are not installed according to the log

•

installation instructions, flame impingement and
improper combustion could occur and result in soot
and/or excessive production of carbon monoxide
(CO), a colorless, odorless, toxic gas.

REFERENCE - Firebox Accessories / Parts

Cat. No. Model Description

88L53 FGE Bag of Glowing Embers
80L42 FDVS Bag of Volcanic Stone

Figure 31

For Propane Gas Only, Do Not Place Embers On Main Ports

Step 1. Install the ceramic panels per the instructions provided in kit

(reference form #750182M).

Step 2. Place the volcanic stone around the burner as shown in Figure

33.

Step 3. Separate the glowing embers (rockwool) into pieces about the

size of a quarter (see Figure 31). Keep the pieces uffed, not
matted. Distribute these pieces over the burner as shown in

Figure 32. Do not use more than necessary. When properly

positioned, the Glowing Embers will cover approximately 75%
of the burner on natural gas. For propane gas, do not place
embers on main ports.

Note: Excessive use of embers may result in sooting or poor flame.
This appliance is provided with enough Glowing Embers for several
applications, do not feel compelled to use all that is in a new bag. For
best glowing effect, replace the ember material annually. Replacement
Glowing Embers are available (Catalog Number 88L53).

Step 4. Position the individual logs as shown in Figures 34 through 38.

Logs should be placed in the order shown. Place logs 2 and 3
against the pins on the grate, NOT over them.

Proper log and twig placement is critical to encourage outstand-

ing flame appearance and prevent sooting. When positioned

properly as shown, twigs will be positioned between ame

peaks and will not impinge any flames. Positioning is the same
for all colors of log sets.

Glowing Embers (Rockwool)

Figure 32

Volcanic Stone

Figure 33 - (LSM45-PV Shown)

22

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

LSM40-PV and LSM45-PV Log Placement

2

6

Figure 34

3

7

5

1

Log Number Description

1 Log, Center

2 Log, Rear

3 Log, Center/Left
4 Log, Center/Right

5 Log, Rear/Top

6 Log, Front/Left

7 Log, Front/Center

2

4

Figure 36

Align Groove At The Bottom Of Log (2) Over
The Grate And Push It Towards The Rear.

3

4

Figure 35

1

Align Two Holes At Bottom Of Log (1)
Over The Pins On The Gas Burner.

Engage Logs (3 & 4) With The Grate Pins And Align Groves At
The Bottom Of The Logs Over The Grate.

Figure 37

6 5

Engage Log (6) With The Grate Pin
And Align Groove At The Bottom Of
The Log Over The Grate.

Align Hole At Bottom Of Log (5)
Over The Pin On Log (2).

Engage Log (7)
With The Pin On
Log (4).

Figure 38

7

2

4

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

23

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

Glass Door Latch (2)

Glass Door Assembly

Firebox Floor

Top Flange Glass Door
Frame Assembly

Screws

Step 10. INSTALLATION AND REMOVAL
OF GLASS DOOR

• When reinstalling the glass

door, the door latch screws
must be securely tightened
to prevent the glass door
from falling out, which could
potentially cause damage and
possible injury.

• Do not attempt to substitute the

materials used on this door,
or replace cracked or broken
glass.

• Handle this glass with extreme

care! Glass is susceptible to
damage – Do not scratch or
handle roughly while reinstall­ing the glass door frame.

• The glass door of this appli-

ance must only be replaced
as a complete unit as provided
by the manufacturer. Do not
attempt to replace broken,
cracked or chipped glass sepa­rately.

• Do not attempt to touch the

front enclosure glass with your
hands while the fireplace is in
use.

Do not operate appliance with
the glass front removed, cracked
or broken.

AVERTISSEMENT

Ne pas utiliser l'appareil si le
panneau frontal en verre n'est
pas en place, est craqué ou
brisé.

WARNING

WARNING

Only doors certified with the appliance
shall be used.

Seules des portes certifiées pour cet
appareil doivent être utilisées.

CAUTION: DO NOT abuse glass door by
striking or slamming shut.

Retrieve the glass door. Visually inspect the

gasket on the backside of the frame. Gasket
surface must be clean, free of irregularities

and seated firmly.

Position the door in front of the rebox opening

with the top of the door held away from the
fireplace (Figure 39). Lower the bottom of the

door assembly on the bottom door track and

set on padded surface. Pivot the door up after

engaging and centering in the base channel.

Using a Phillips screwdriver, fasten the door

frame to the door latch with the two (2) screws.

The latch should pull forward to engage the
door frame.

Install the door modesty shield on top flange

glass door as follows: grab the door modesty
shield with both hands, with the open hem

going down and engage it with the upper lip

of the glass door frame by pushing it all the
way down. Make sure the installed shield is

firmly in place.

With the firescreen hanging on the screen rod,

insert the right side of the rod into the existing
hole on the right modesty panel. Bend down

the rod at the center and drop the left end into

the slot on the left modesty panel, being careful

not to scratch the paint.

Figure 39 ­INSTALLING THE GLASS DOOR

Step 11. BURNER ADJUSTMENTS

Flame Appearance and sooting

Proper flame appearance is a flame which is

blue at the base and becomes yellowish-orange
in the body of the ame.

When the appliance is first lit, the entire flame

may be blue and will gradually turn yellowish-

orange during the first 15 minutes of operation.
After 15 minutes of operation, if the flame is

blue, or if the ame is orange with evidence of
sooting (black tip), the air shutter opening may
need to be adjusted.

If the air shutter opening is closed too far,
sooting may develop. Sooting is indicated

by black puffs developing at the tips of very
long orange ames. Sooting results in black

deposits forming on the logs, appliance inside

surfaces and on exterior surfaces adjacent to

the vent termination.

Sooting is caused by incomplete combustion
in the ames and lack of combustion air enter-

ing the air shutter opening. To achieve a warm

yellowish-orange ame with an orange body
that does not soot, the shutter opening must be
adjusted between these two extremes.

Air Shutter Adjustment Guidelines

• If there is smoke or soot present, rst check

the log set positioning to ensure that the
flames are not impinging on any of the logs.
If the log set is properly positioned and a

sooting condition still exists, then the air
shutter opening should be increased.

• The more offsets in the vent system, the larger
the air shutter opening will need to be.

• An appliance operated with the air shutter

opened too far, may have flames that appear

blue and transparent. These weak, blue and

transparent flames are termed anemic.

• Units converted for use with Propane gas
may exhibit ames which candle or appear
stringy. If this is present and persists, adjust

the air shutter to a more closed position, then
operate the appliance for a few more minutes
to ensure that the flame normalizes and the
flames do not appear sooty.

The following chart is provided to aid you in

achieving the correct air shutter adjustment

for your installation.

Air Shutter Adjustment Guidelines:

Amount of

Primary Air

If air shutter is
closed too far

If air shutter is
open too far

Flame

Color

Flame will
be orange

Flame will
be blue

Air Shutter

Adjustment

Air shutter
gap should be
increased

Air shutter
gap should be
decreased

24

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Burner Air Shutter Adjustment Procedure

WARNING

• Air shutter adjustment should
only be performed by a quali­fied professional service
technician.

• Ensure that the front glass

door assembly is in place and
sealed After adjustment.

CAUTIONS

Main Burner Factory Air Shutter

Opening Setting - Inches (millimeter)

Model Natural

LSM40-PV

LSM45-PV

1/8 (3.18) 1/4 (6.35)
1/8 (3.18) 1/4 (6.35)

Gas

Propane

Gas

Burner

Air Shutter
Opening

Venturi

Orifice

Gas Valve

• Soot will be produced if the

air shutter is closed too much.
Any damage due to carboning
resulting from improperly
setting the air shutter is not
covered under the warranty.

To adjust the ame, rotate the air shutter toward
the back or toward the front of the replace.

Position the air shutter to the factory setting as

shown in the table in Figure 40. Allow the burner
to operate for at least 15 minutes. Observe the

flame continuously. If it appears weak or sooty

as previously described, adjust the air shutter

until the flame appearance is as desired.

Use the extension knob (refer to Figure 28
on Page 21), to adjust the flame height as

desired, by sliding the knob over the variable
flame adjustment knob located on the front of
the valve. Replace the extension knob back
to the hanger after the adjustment.

Units converted for use with propane gas may

exhibit a ame pattern that may candle or ap­pear stringy. If this is problematic or persists
as the appliance is continually operated, adjust
the air shutter open as described in the previous

paragraphs. Operate the appliance for a period of
time as the effect diminishes, ensuring that the
appliance does not develop sooty flames. When
satisfied that the appliance operates properly,
proceed to finish the installation.

Figure 40

(Birch Logs Shown) LSM40-PV

Figure 41 - Burner Flame Appearance

(Rustic Oak Logs Shown) LSM45-PV

Venturi

Leave the control knob in the ON position and

the remote switch OFF.

Note: See Figures 41 and 42 for proper burner
flame appearance.

Figure 42 - Burner Flame Appearance

25

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Glass Door

Assembly

Fireplace

Finish Combustible
Or Non-Combustible
Material

Bottom Of
Fireplace

1/8 Inch
Minimum

Door Track

Finish Combustible
Or Non-Combustible
Material

Front Face
Of Fireplace

Floor Panel

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

FINISHING REQUIREMENTS
Wall Details

Complete finished interior wall. To install the appliance facing flush with
the finished wall, position framework to accommodate the thickness of
the finished wall (Figure 43).

3" Min.

(76 mm)*

Combustible
Finished Wall
Materials

Header
(2x4’s)

Combustible
materials are
allowed above
this point on
the face of the
appliance.

8-3/8" Min.

(213 mm)

The gray shaded
area must be
non-combustible
or Dura Rock

1"
(25.4mm)
Minimum

Top of

Appliance

Spacers

Adaptor Plus 4

Feet Vertical

Vent (Min.)

& 90° Elbow

Non-combustible materials, such as surrounds and other appliance trim,
may be installed on the appliance front face with the exceptions.

Vertical installation clearances to combustible mantels vary according to
the depth of the mantel (see Figure 5 on Page 8). Mantels constructed
of non-combustible materials may be installed at any height above the

appliance opening.

Combustible materials may project beyond the side of the replace

opening as long as it is kept within the shaded area illustrated in Figure
6 on Page 8.

Top of Door Frame

Fireplace (right side)

* Insulation is NOT ALLOWED in the clearance zones around vent compo-

nents. Keep this area free from combustible materials.

Figure 43

A hearth extension is not required with this appliance. If a hearth extension
is used, there are two methods of installation. One, the nish combustible
or non-combustible material could be ended by butting up against the

front face of the fireplace and the floor panel (refer to Figure 44).

Two, the nish combustible or non-combustible material could be ended
below the replace (refer to Figure 45). Remove the floor panel as shown
in Figure 44 by removing the screws on the right side of the panel and
sliding the left side away from the tab. Discard the screws and oor panel.

It is critical that there is at least a 1/8" gap between the bottom of the
door track and the surface of the finish material.

Figure 44

Figure 45

26

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Step 12. ATTACHING SAFETY-IN-OPERATION WARNINGS
It is the installers 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.

ATTACHING SAFETY-IN-OPERATION
WARNINGS

It is required that the safety instruction labels
furnished with the replace be afxed to the op-

eration and control point of the fireplace. A safety

instruction label must be afxed to the wall switch

plate where the fireplace is turned on and off (See
Figure A) or wall thermostat (See Figure B) and if
used on the remote control handheld transmitter
(Figure C). To properly complete the installation of

this replace, locate the multi-lingual adhesive labels

provided with the Care and Operation Instructions
and proceed as follows:

1. Locate the wall switch or wall thermostat that
controls the fireplace (verify the switch operates

the replace by turning it on and off). Clean the

wall switch plate or wall thermostat thoroughly

to remove any dust and oils. Afx the label to

the surface of the plate of the wall switch that
controls the fireplace (Figure A) or the wall
thermostat (Figure B). Choose the language

primarily spoken in the home. If unknown, afx
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. Afx the label to

the surface of handheld transmitter (Figure C).
Choose the language primarily spoken in the

home. If unknown, afx 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 additional

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.

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) ou sur le thermostat
mural (voir Figure B) et, le cas échéant, sur le boîtier
de la télécommande (Figure C). Pour achever l’instal-
lation 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 ou le thermostat mural qui
contrôle le foyer (vérifiez 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
ou le thermostat mural 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) ou du thermostat
mural (Figure B). 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 télé-

commande (Figure C). Choisissez la langue qui est
principalement 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 distribu­teur 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.

COLOCACIÓN DE ADVERTENCIAS DE SEGURIDAD
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) o en el
termostato de pared (ver la Figura B) y en el transmisor
de control remoto (Figura C) si se usa. Para completar
correctamente la instalación de esta chimenea,
encuentre las etiquetas adhesivas multilingües incluidas
con las instrucciones de cuidado y operación y haga
lo siguiente:

1. Identifique el interruptor o el termostato de pared
que controla la chimenea (verifique que el interruptor

opera la chimenea encendiéndola y apagándola).
Limpie bien la placa del interruptor o el termostato

de pared para quitar el polvo y aceite. Pegue la
etiqueta en la superficie de la placa del interruptor que
controla la chimenea (Figura A) o en el termostato
de pared (Figura B). Seleccione el idioma que

más se habla 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
la superficie del transmisor (Figura C). 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 etiquetas

de instrucciones de seguridad adicionales gratuitas.

Juego de etiquetas de repuesto - Nº de cat. 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.

SAFETY LABEL

DIAGRAMS

DIAGRAMMES DES ÉTIQUETTES

DE SÉCURITÉ

Figure A Figure B Figure C

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

DIAGRAMAS DE ETIQUETAS

DE SEGURIDAD

27

S

e

a

l

a

n

t

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

INSTALLATION ACCESSORIES

Listed Secure Vent™ Components

Cat. No. Model No. Description

77L70 SV4.5L6

77L71 SV4.5L12

77L72 SV4.5L24

77L73 SV4.5L36

77L74 SV4.5L48

77L75 SV4.5LA

77L76 SV4.5E45

77L77 SV4.5E90

H2246 SV4.5HF

H2247 SV4.5VF

The following flashings come packaged with a storm collar:

H5816

SV4.5-TWSK Through Wall Shield

750,247M

6 inch (152mm) Vent
Section

12 inch (305mm) Vent
Section

24 inch (610mm) Vent
Section

36 inch (914mm) Vent
Section

48 inch (1219mm)
Vent Section

Telescopic Section

45 Degree Elbow

90 Degree Elbow

Firestop/Spacer ­Horizontal
(3 - 1 - 1 spacing) 10
pack

Firestop/Spacer ­Vertical
(1 - 1 - 1 spacing) 10
pack

Kit
(used to shield the
direct-vent pipe from
blown insulation)
Ref. instr. # 750,247M

Listed Secure Vent / Secure Flex™ Components

Cat. No. Model No. Description

Attic Insulation Shield

H3907 SV4.5RSA

H7748 FVK36

10K81 SFMP Mill-Pac, Black, High

89L40 SFMP-12 Mill-Pac, Black, High

91L66 SF-GC4-6 Gear Clamp 4.5 in. (114

91L67 SF-GC7-6 Gear Clamp 7.5 in.

(adjustable 12” to
22”)

36" Flex Vent Kit

Note: Flex attaches to ap­pliance collar at one end
and to rigid venting at the
other end.

Temperature Sealant

Temperature Sealant ­Bulk 12 pack

mm) for flex (6 pieces)

(190.5 mm) for flex (6
pieces)

28

96K93 SV4.5SU

96K92 SV4.5SP

Support Strap

Support Plate

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Burner Assembly

Gas Valve
Assembly

Orifice

GAS CONVERSION KITS

WARNING

This conversion kit shall be installed by a qualified service agency in
accordance with the manufacturer’s instructions and all applicable codes
and requirements of the authority having jurisdiction. If the information in
these instruction is not followed exactly, a fire, explosion or production of
carbon monoxide may result causing property damage, personal injury
or loss of life. The qualified service agency is responsible for the proper
installation of this kit. The installation is not proper and complete until the
operation of the converted appliance is checked as specified in the manu­facturer’s instructions supplied with the kit.The qualified service agency
performing this installation assumes responsibility for this conversion.

AVERTISSEMENT

Cette trousse de conversion doit être installée par un technicien agréé,
selon les instructions du fabricant et selon toutes les exigences et tous les
codes pertinents de l’autorité compétente. Assurez-vous de bien suivre
les instructions dans cette notice pour réduire au minimum le risque
d’incendie, d’explosion ou la production de monoxyde de carbone pouvant
causer des dommages matériels, des blessures ou la mort. Le tecnicien
agréé est responsable de l’installation de cette trousse. L’installation n’est
pas adéquate ni complète tant que le bon fonctionnement de l’appareil
converti n’a pas été vérifié selon les instructions du fabricant fournies avec
la trousse. Le fournisseur de service qualifié ayant réalisé l'installation
assume les responsabilités liées à la conversion.

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
following steps detail the conversion proce­dure. Refer to the instructions provided with
the conversion kit when performing any gas
conversion.

Electronic SIT Systems

Natural Gas To Propane Gas

Conversion Kit (Electronic)
Model No. Cat. No.
LSM40-PV H7934
LSM45-PV H7934

INSTALLATION INSTRUCTIONS

Step 1. TURN OFF THE GAS SUPPLY TO THE
APPLIANCE and disconnect power supply at
the circuit breaker. Ensure appliance is cold.

CAUTION THE GAS SUPPLY SHALL BE
SHUT OFF PRIOR TO DISCONNECTING
THE ELECTRICAL POWER, BEFORE
PROCEEDING WITH THE CONVERSION.

ATTENTION. AVANT D’EFFECTUER
LA CONVERSION, COUPEZ D’ABORD
L’ALIMENTATION EN GAZ, ENSUITE,
COUPEZ L’ALIMENTATION ÉLECTRIQUE.

Step 2. Remove the front glass door/frame

and the access plate from the appliance. See
Figure 39.

Step 3. Carefully remove the logs and the grate

assembly. Exercise care so as not to break
the logs.

Step 4. Refer to Figure 46. Remove the burner

assembly with attached venturi tube.

Figure 46

Step 5. Refer to Figure 47 on Page 30 and
the instructions provided with the kit. Using
a Torx T20 (with 1/4” shank and center hole),
remove and discard the three pressure regulator
mounting screws. Remove the pressure regu-

lator, spring, poppet, diaphragm and bushing.

Discard all removed components.

Ensure the rubber gasket installed 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

29

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

Pressure

Regulator

Remove
These
Components

LO

HI

Pressure

Regulator

SIT Electronic Gas Valve

Figure 47

Step 6. Refer to Figure 48 and remove the

pilot hood assembly to access the hexed pilot

orifice. Remove and replace the orifice with
the one provided with the kit.

Pilot
Orifice

SIT Electronic Pilot

Pilot
Orifice

Electronic Pilot Assembly

Figure 48

Step 7. (Refer to Figure 46 on Page 29 and
Figure 49)

VERIFY THE PROPER ORIFICE SIZE BE­FORE INSTALLING IT.

A. Remove the orifice from the manifold and

replace it with the one provided in the kit. See

the following table for orice sizes for natural

and propane models. Figure 49 illustrates

the orice. Use pipe joint compound or
Teon tape on all pipe ttings before install-

ing (ensure propane resistant compounds
are used in propane applications, do not

use pipe joint compounds on are ttings).

B. Retrieve the burner and slide the venturi tube

over the orice. Set the burner assembly

into its position and secure it.

C. Reinstall the grate assembly.

Burner Orifice Size

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

Model Natural Gas Propane Gas

LSM40-PV

LSM45-PV

Table 9

.125" (1/8") *

H7924

.125" (1/8") *

H7924

* Standard size installed at factory

•Part/Cat.Number

•

•

.073" (#49)

H7936 •

.073" (#49)

H7936 •

Figure 49

Step 8. Reassemble the remaining components
by reversing the procedures outlined in the

preceding steps.

Step 9. Attach the conversion label provided

in the conversion kit to the rating plate on the
appliance.

Step 10. Turn on gas supply and test for gas
leaks. See Test All Connections For Gas Leaks
on Page 21.

Step 11. 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.

ALWAYS TEST PRESSURES WITH THE VALVE
REGULATOR CONTROL AT THE HIGHEST
SETTING.

30

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

NOTES

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

31

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

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 replace code information.

Printed in U.S.A. © 2009 Lennox Hearth Products

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

32

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