Lennox Hearth LSM40ST-N, LSM40ST-P User Manual

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INSTALLATION INSTRUCTIONS

WARNING /AVERTISSEMENT/AVISO

Montebello See-Through Direct-Vent Gas Fireplaces

P/N 506023-12 Rev. B 05/2011

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 506223-11.

506025-05

for Care and Operation Instructions.

MODELS

LSM40ST-N LSM40ST-P

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

Intertek Report No.

100326523PRT-001

Look for the EnerGuide

Gas Fireplace Energy

Efficiency Rating in this manual.

Based on CSA P.4.1-02

consultation ultérieure.

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.

• HOT GLASS WILL CAUSE BURNS.

• DO NOT TOUCH GLASS UNTIL COOLED.

• NEVER ALLOW CHILDREN TO TOUCH GLASS.

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

- 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.

• 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.

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.

- 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.

• EL VIDRIO CALIENTE CAUSARÁ QUEMADURAS.

• USTED DEBE NUNCA TOCAR EL VIDRIO CALIENTE.

• LOS NIÑOS DEBEN NUNCA TOCAR EL VIDRIO.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

TABLE OF CONTENTS

Packaging ................................................... 2

Introduction ................................................ 2

Approved Vent Components .................... 2

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

Misc. Codes/Standards ........................... 3

Inputs and Efﬁciencies ............................ 3

Gas Supply Pressure Requirements ........ 3

Gas Valve Diagram ................................. 4

Oriﬁce Sizes ............................................ 4

Massachusetts / NYC Requirements ....... 4

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

Manufactured Home Requirements ............ 5

Location ...................................................... 5

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

Hearth Extensions (Optional) ...................... 8

Minimum Clearances to Combustibles ........ 9

Pre-Installation Steps .................................. 10

Typical Installation Sequence ..................... 10

Detailed Installation Steps:

Step 1. Framing .......................................... 10

Framing Speciﬁcations ............................. 11

Fireplace Dimensions ............................... 12

Step 2. Route Gas Line .............................. 13

Step 3. Install Vent System ........................ 14

General Information ................................. 14

Vent Restrictor Assembly/Installation ...... 14

Vent Termination (Vertical/Horizontal) ..... 14

Vertical (Roof) Termination ...................... 15

Vertical Termination with Straight

Vertical Venting ............................... 15

Straight Vent Section Lengths Table ... 15 Vertical Termination with Offset

Vertical Venting ............................... 16

Vertical Termination System Figures

and Tables ........................................ 18

Horizontal (Wall) Termination .................. 19

Horizontal Termination System

Figures and Tables ........................... 21

Step 4. Field Wiring .................................... 23

Step 5. Remove Glass Door ....................... 23

Step 6. Connecting Gas Line ...................... 24

Step 7. Install Firebox Liner Panels ............ 25

Step 8. Verify Appliance Operation ............. 25

Step 9. Install Volcanic Stone, Glowing

Embers, and Logs .................................... 26

Step 10. Install Glass Doors, Mesh Pull

Screens, and Modesty Panel ................... 29

Step 11. Burner Adjustments ..................... 30

Finishing Requirements .............................. 31

Step 12. Attaching Safety-in-Operation

Warnings ..................................... 33

Installation Accessories .............................. 34

Gas Conversion Kits .......................... 35

The assembled vented gas replace is packaged with the following items:

• Fireplace Components:

(1) Literature Kit (in envelope in rebox;

contains Care and Operation Instructions, Installation Instructions, safety-

in-operation warning labels, warranty)

(1) Remote Control Kit (in plastic bag in re-

box; contains remote control, receiver) (1) Log Set (1) Vent Restrictor Assembly (1) bag Glowing Embers (4) bags Volcanic Stone (1) Door Modesty Shield

• Panel Kit (sold separately; REQUIRED for all

replace models) - one of the following kits:

– Architectural Stone Ceramic – Venetian Tile Ceramic – Buff Herringbone Ceramic – Buff Rustic Ceramic – Black Rustic Ceramic – Black Porcelain

• Outdoor Installation Kit (sold separately;

REQUIRED for indoor/outdoor installations)

INTRODUCTION

The Montebello™ See-Through is a direct-vent, sealed combustion gas replace designed

for either indoor/indoor or indoor/outdoor residential applications (including screened

porches and lanais). See “Minimum Clearances to Combustibles” on Page 9.

NOTE: INDOOR/OUTDOOR INSTALLATIONS REQUIRE AN OUTDOOR INSTALLATION KIT

(SOLD SEPARATELY).

These appliances are designed to operate on natural or propane gas. The system is switch-

able between standing and intermittent pilot

modes.

External electrical power is required to operate these units. If the system operates on line

voltage, four “AA” batteries (in receiver) can be used as a backup in case of a power outage.

Approved Vent Components

These ﬁreplaces are designed, tested, and listed for operation and installation with the following vent components (8" inner and 11" outer) only:

™

• SecureVent

ponents 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.

SV8 direct-vent system com-

GENERAL INFORMATIONPACKAGING

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 infor-més 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.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • 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 Intertek (Report No. 100326523PRT-001) to ANSI Z21.88 (in Canada, CSA-2.33), and CAN/CGA-

2.17-M91 (CSA P4.1) in both USA and Canada,

as vented gas ﬁreplace.

These appliances are listed by Intertek for installation in bedrooms, aftermarket mobile homes, and manufactured homes.

Misc. Codes/Standards

Installation must conform to local codes or, in

the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 - latest edition (in Canada, the current CAN/CSA-B149.1

installation code). The appliance, when installed, must be electri-

cally grounded and wired in accordance with

local codes or, in the absence of local codes,

with the National Electrical Code, ANSI/NFPA 70 - latest edition, or the Canadian Electrical Code, CSA C22.1 - latest edition.

Provide adequate clearances around air openings and adequate accessibility clearance for service and proper operation. Never obstruct the front or back 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.

The system is switchable between standing

and intermittent pilot modes. External electrical power is required to operate these units.

If the system operates on line voltage, four “AA” batteries (in receiver) can be used as a backup

in case of a power outage.

These models come standard with a remotely modulated gas valve. The included transmitter remotely controls ﬂame appearance and heat

output (manual gas valve adjustment is not possible).

Inputs and Efﬁciencies

Appliance BTU inputs are listed in Table 1A. Appliance efﬁciencies are listed in Table 1B.

INPUTS

Gas Type (Fireplace Model) Inputs (BTU/hr)

Natural Gas (LSM40ST-N) 40,000 to 60,000 Liquid Propane (LSM40ST-P) 43,500 to 56,000

Table 1A

EFFICIENCIES

Gas Type (Fireplace Model)

Natural Gas (LSM40ST-N) 68% 67% Liquid Propane (LSM40ST-P) 70% 67%

Table 1B

AFUE EnerGuide

Gas Fireplace Energy Efciency Rating

Based on CSA P.4.1-02

Gas Supply Pressure Requirements

Inlet and manifold gas supply pressure requirements for these appliances are listed in Tables 2 and 3.

Inlet Gas Supply Pressure (all models)

Fuel # Minimum Maximum

Natural Gas

Propane

Table 2

Manifold Gas Supply Pressure (all models)

Fuel # Low High

Natural

Gas

Propane

Table 3

(Continued on next page)

5.0" WC

(1.24 kPa)

11.0" WC

(2.74 kPa)

(Lo) 1.6" WC

(0.4 kPa)

(Lo) 6.3" WC

(1.57 kPa)

10.5" WC

(2.61 kPa)

13.0" WC

(3.23 kPa)

(Hi) 3.5" WC

(0.87 kPa)

(Hi) 10.0" WC

(2.49 kPa)

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Gas Supply Pressure Requirements

(continued)

Test gauge connections are provided on the front of the electronic gas control valve (identiﬁed IN for the inlet and OUT for the manifold

side). The control valves have a 3/8" (10 mm) NPT

thread inlet and outlet side of the valve. 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 not be connected to a

chimney or ﬂue serving a separate solid fuel

burning appliance.

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).

Oriﬁce Sizes

Sea Level To High Altitude (All Models)

These appliances are tested and approved

for installation at elevations of 0– 4500 feet (0– 1372 meters) above sea level using the standard burner orice sizes (marked with an asterisk [*] in Table 4 ). For elevations above 4500 feet, contact your gas supplier or qualied

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; or

• 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 or , in Canada, the CAN/CSA-B149.1- latest edition.

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

Burner Oriﬁce Sizes

Elevation 0– 4500 feet (0–1372 meters)

Natural Gas

Drill size (inches)

#32 (0.116")*

H8002•

Standard size installed at factory.

Table 4

•Part/CatalogNumber.

Propane

Drill size (inches)

#52 (0.0635")*

H8003•

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, horizontal 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.

Line (In) Test Port

Orange Wire

(from DFC Wire

Harness)

Inlet 3/8" NPT

Figure 1: SIT Proﬂame Valve

(From DFC Wire

Manifold (Out)

Test Port

Green Wire

Harness)

Gas Valve Diagram

See valve diagram in Figure 1.

Connect GTMS Wire Harness

Pressure Regulator Tower

Outlet 3/8" NPT

Yellow Ground Wire (From DFC Wire Harness)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

New York City, New York (MEA)

Installation of these ﬁreplaces is approved for

installation in New York City, NY.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

COLD CLIMATE INSULATION

For cold climate installations, seal all cracks

around the appliance with noncombustible

material and wherever cold air could enter the

room. If the oor is above ground level, it is

especially important to insulate outside chase

cavity between studs and under the oor on

which the appliance rests. Gas line holes and

other openings 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 under-

neath 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.

Drywall

Outdoors

Indoors

(Top View)

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, or the Standard for Installation

in Mobile Homes, CAN/CSA Z240 MH Series,

in Canada.

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 ou à la norme Can/CSA-Z240 Série MM, Maisons mobiles au Canada.

This appliance is only for use with the type of gas indicated on the rating plate. This ap-

pliance 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 con-

verti à d'autres gaz, sauf si une trousse de

conversion est utilisée.

Top of Fireplace Opening

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

Figure 2: Typical Installation/Locations

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.

CAUTION: Due to high temperatures, the appliance should be located out of trafﬁc and away from furniture and draperies (Figure 2).

AVERTISSEMENT : 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 also should be free of electrical, plumbing, or other heating/air conditioning

ducting.

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 or vinyl tile), a metal or wood barrier covering the entire bottom surface must be used.

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 or the Canadian Electrical Code CSA C22.1 - latest edition.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

*H = MINIMUM HEIGHT FROM ROOF TO LOWEST DISCHARGE OPENING OF VENT

TERMINATION HEIGHTS FOR VENTS ABOVE

FLAT OR SLOPED ROOFS

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • 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 or the current standards of CAN/CSA-B149.1 in Canada.

Vertical Vent Termination Clearances

Terminate multiple vent terminations accord-

ing to the installation codes listed above. Also

see Figure 3A.

Terminate single vent caps relative to building

components as shown in Figure 3B.

12 in (305 mm) minimum

Horizontal Overhang

2 FT

2 FT MIN.

Vent

Termination

Storm Collar

Flashing

Concentric

Vent Pipe

*H = minimum height from roof to lowest discharge opening of vent.

MIN.

Lowest

Discharge

Opening

1 inch (25.4 mm) Minimum Clearance to Combustibles

Vertical Wall

Roof Pitch is X/12

Figure 3B: Vertical Vent Termination Clearances

Vent/air intake termination clearances

above the high side of an angled roof are listed in the table below.

Termination Heights for Vents

Above Flat or Sloped Roofs

(Ref. NFPA 54 / ANSI Z223.1)

Roof Pitch *Feet *Meters

Flat to 6/12 1.0 0.3

6/12 to 7/12 1.25 0.38 7/12 to 8/12 1.5 0.46

8/12 to 9/12 2.0 0.61

9/12 to 10/12 2.5 0.76

10/12 to 11/12 3.25 0.99 11/12 to 12/12 4.0 1.22

12/12 to 14/12 5.0 1.52 14/12 to 16/12 6.0 1.83

16/12 to 18/12 7.0 2.13

18/12 to 20/12 7.5 2.29 20/12 to 21/12 8.0 2.44

Figure 3A : Multiple Terminations

Horizontal Vent Termination Clearances

The horizontal vent termination must have a minimum of 3 in (76 mm) clearance to any overhead combustible projection of 2-1/2 in (64 mm) or less (see Figure 4). For projections exceeding 2-1/2 in (64 mm), see Figure 4. For additional vent location restrictions refer to Figure 5 on Page 7.

Combustible

Projection

extending more

than 2.5 inches

Combustible Projection extending up to 2.5 inches

24 in

(610 mm)

Horizontal Termination Kit

Horizontal Vent Termination Clearances

For recess allowances of square horizontal termination into exterior walls, see Figure 30 on Page 20.

Figure 4

3 in

(76 mm)

Side Elevation View

Ventilated or Unventilated Sofﬁt



= Vent terminal

= Air supply inlet

= Area terminal NOT permitted

= 9" U.S. (12" Canada)

= Vent terminal

= Air supply inlet

= Area terminal NOT permitted

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS

NOTE:

•Local codes or regulations may require

different clearances.

•Location of vent termination must NOT

interfere with access to electrical service.

= Vent terminal

= Area terminal NOT permitted

= Air supply inlet

= 9" U.S. (12" Canada)



Center Line of

Horizontal

Termination

36"

(91.4 cm)

Exterior Wall

36"

(91.4 cm)

Inside Corner

[DETAIL]

See Item “D” in table below.

Ventilated

Sofﬁt

[DETAIL]

Inside Corner

Fixed Closed

Window

Operable

Window



V V

B B

MINIMUM CLEARANCES

Clearance Description US Installation  Canadian Installation 

A = Clearance above grade, veranda, porch,

deck, or balcony.

B = Clearance to window or door that may be

opened.

C = Clearance to permanently closed window. 9 in (229 mm) recommended to prevent window

D = Vertical clearance to ventilated sofﬁt

located above the terminal within a horizontal distance of 36 in (91.4 cm)

from center line of terminal.

E = Clearance to unventilated sofﬁt. 24 in (61 cm) 24 in (61 cm) F = Clearance to outside corner. 5 in (12.7 cm) 5 in (12.7 cm) G = Clearance to inside corner. 24 in (61 cm) 36 in (91.4 cm)

H = Clearance to each inside of center line

extended above meter/regulator assembly.

= Clearance to service regulator vent outlet. 3 ft (91.4 cm)  3 ft (91.4 cm) 

J = Clearance to non-mechanical air supply

inlet to building or combustion air inlet to

any other appliance.

K = Clearance to mechanical air supply inlet. 3 ft (91.4 cm) above, if within 10 ft (3 m) horizontally. 6 ft (1.83 m)  L = Clearance above paved sidewalk or paved

driveway located on public property.

M = Clearance under veranda, porch, deck, or

balcony.

 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Codes (latest editions).  In accordance with the current CAN/CSA-B149.1 Installation Code (latest editions).  A vent shall not terminate directly above a sidewalk or paved driveway that 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 of two sides beneath the oor.

Figure 5

18 in (46 cm)  18 in (46 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 in (30 cm) for appliances > 50,000 BTU/hr (15kW).

condensation.

24 in (61 cm) 24 in (61 cm)

3 ft (91.4 cm) within a height of 15 ft above the

meter/regulator assembly.

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 in (30 cm) for appliances > 50,000 BTU/hr (15kW).

7 ft (2.13 m)  7 ft (2.13 m) 

18 in (46.0 cm)   18 in (46.0 cm) 

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

6 in (15.2 cm) for appliances < 10,000 BTU/hr (3kW); 12 in (30 cm) for appliances > 10,000 BTU/hr (3kW)

and < 100,000 BTU/hr (30kW);

36 in (91.4 cm) for appliances > 100,000 BTU/hr (30kW). 12 in (305 mm) recommended to prevent window

condensation.

3 ft (91.4 cm) within a height of 15 ft above the

meter/regulator assembly.

6 in (15.2 cm) for appliances < 10,000 BTU/hr (3kW); 12 in (30 cm) for appliances > 10,000 BTU/hr (3kW)

and < 100,000 BTU/hr (30kW);

36 in (91.4 cm) for appliances > 100,000 BTU/hr (30kW).

D E

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

HEARTH EXTENSIONS (OPTIONAL)

Note: Hearth extensions are not required with this appliance.

Optional Indoor Hearth Extension

Combustible indoor hearth material may only be installed at or below the base of the replace (see Figures 6 and 7).

Non-combustible indoor hearth material may be installed above the base of the replace and may butt against the front face of the replace (see

Figures 6 and 7).

Also note the following:

• Combustible material may project beyond the sides of the replace

opening, as long as it is within the shaded area shown in Figure 10 on Page 9.

• Vertical installation clearances to combustible mantels vary according

to the depth of the mantel (see Figure 9 on Page 9).

• Non-combustible mantels may be installed at any height above the

appliance opening.

Optional Outdoor Hearth Extension

All outdoor hearth material (combustible and non-combustible) must be installed a minimum of 6" (152 mm) below the base of the replace

(see Figure 7).

Also note the following:

• For vertical installation clearances to combustible outdoor mantels and

overhangs, see Page 32 and the instructions provided in the Outdoor

Installation Kit (required for all outdoor installations; see Page 34).

• Non-combustible outdoor mantels and overhangs may be installed at any height above the appliance opening.

Indoor

Side

Fireplace

(side view)

Outdoor

Side

Finish combustible material must be installed at or below base of ﬁreplace.

Finish non-combustible material may butt against front face of ﬁreplace.

Also see Figure 7.

Figure 6: Optional Indoor Hearth Extension

Floor Panel

Indoor hearth extension:

Front Face of Fireplace

Finish combustible material must be installed at or below base of ﬁreplace.

Finish non-combustible material may be installed above base of ﬁreplace and may butt against front face of ﬁreplace.

Figure 7: Optional Indoor and Outdoor Hearth Extensions

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

6" (152 mm)

minimum

Outdoor hearth extension:

All ﬁnish hearth material (combustible and non-combustible) must be at least 6" (152 mm) below base of ﬁreplace.

7 (178)

(51)

(102)

(152)

(203)

(254)

(305)

9 (229)

13 (330)

17 (432)

15 (381)

11 (279)

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

MINIMUM CLEARANCES TO COMBUSTIBLES

Appliance and Vent Clearances

The appliance is approved with zero clearance to combustible materials on both sides (as detailed in Table 5), with the following exceptions:

• 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).

MINIMUM CLEARANCES TO COMBUSTIBLES

Back / Sides Top Spacers 0 in (0 mm) Floor 0 in (0 mm) Unit Bottom to Ceiling 72.0 in (1829 mm) Vertical Vent Pipe 1.0 in (25.4 mm) Horizontal Vent Pipe

0 in (0 mm) Spacers

Top: 4.0 in (102 mm) Sides: 1.0 in (25.4 mm) Bottom: 1.0 in (25.4 mm)

SERVICE CLEARANCES

Front 3 ft (0.9 m)

Table 5







Do NOT insulate space between appliance and area above it.

Combustible

Enclosure/Shelf

Min. 4"

(102 mm)

91.5" (2324 mm)

Indoor/Outdoor

90" (2287 mm)

minimum

Indoor/Outdoor

Min. 2 ft vertical vent section and one 90-degree elbow required

minimum

Top of Fireplace

2 x 4

Figure 8: Min. Height of Combustible Enclosure

Mantel Depth

IMPORTANT!

Min. clearance to

combustibles above any

horizontal vent component

4" (102 mm).

 4" (102 mm) above any horizontal/inclined vent component.

 See Step 1 ("FRAMING") on Page 10 for clearance requirements to

nailing ﬂanges on each side of unit and any adjacent screw heads.

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.

Min. Height of Combustible Enclosure

To provide for the lowest possible combustible enclosure (or shelf) surface, the venting should be routed in a way to minimize obstructions to the space above the appliance. Do not insulate the space between the appliance and the area above it (see Figure 8).

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 faces (black sheet metal). Never allow combustible materials to be positioned in front of or overlapping the appliance face. See Pages 31 and 32.

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 9 ). Mantels constructed of non- combustible materials may be installed at any height above the appliance

opening.

Note: Use high-temperature paint (rated 175°F or higher) on the underside of the mantel.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

to bottom of mantel

Distance from top of appliance

Inches

(millimeters)

Top of Appliance

Figure 9: Mantel Clearances

Minimum Distance to Unprotected Side Wall

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" maximum.

Gray area is “safe zone”

14" (356 mm)

8.25" (209 mm)

(13 mm)

Figure 10: Side Wall Clearances

0.5"

45°

Protected wall shown in white

Top View of Fireplace

Combustible materials are allowed in gray “safe

5 in (127 mm)

zone” illustrated here. Combustible walls are

shown in black.

12 in

Protected wall is shown

(305 mm)

in white. Combustible material

17 in

may project beyond

(432 mm)

the side of the ﬁreplace opening if it is within the gray "safe zone" illustrated here.

Side View

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

PRE-INSTALLATION STEPS

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

1. Remove the shipping carton, exposing the

front glass door on the control side.

2. Using a Phillips screwdriver, unfasten two

(2) screws located at the top of the glass

frame (see Figure 50 on Page 29). 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.

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.

TYPICAL INSTALLATION SEQUENCE

The typical sequence of installation is outlined

below.

Note: Each installation is unique and may result in variations to the steps described herein.

See the page numbers referenced in the following steps for detailed procedures.

Step 1. FRAMING (Page 10): Construct

appliance framing. Position

appliance within framing; and secure with nailing brackets.

Step 2. ROUTE GAS LINE (Page 13):

Route gas supply line to right side (when viewed from control side of

appliance).

Step 3. INSTALL VENT SYSTEM (Page 14):

install vent system and exterior termination.

Step 4. FIELD WIRING (Page 23): Connect

120 Vac electrical power to the appliance receptacle.

Step 5. REMOVE GLASS DOOR ASSEMBLY

(Page 23).

Step 6. CONNECT GAS LINE (Page 24):

Make connection to gas supply.

Step 7. INSTALL FIREBOX LINER PANEL

KIT (Page 25).

Step 8. VERIFY APPLIANCE OPERATION

(Page 25).

Step 9. INSTALL VOLCANIC STONE,

GLOWING EMBERS, AND LOGS

(Page 26).

Step 10. INSTALL GLASS DOORS, MESH

PULL SCREENS, AND MODESTY PANEL (Page 29).

Step 11. BURNER ADJUSTMENTS (Page

30): Adjust burner air shutter to

ensure proper ﬂame appearance.

FINISHING REQUIREMENTS (Page 31). Step 12. ATTACHING SAFETY-IN-

OPERATION WARNINGS (Page 33).

DETAILED INSTALLATION STEPS

Step 1. FRAMING

Frame these appliances as illustrated in Figure 12 on Page 11. All framing details must allow

for a minimum clearance to combustible framing members as shown in Table 5 and Figures

8–10 on Page 9.

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

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.

Secure the ﬁreplace to the side framing mem-

bers using the unit's nailing anges — one top and bottom on each side of the replace

front (see Figure 11). Use 8d nails or their equivalent.

Securing Unit to Framing by Nailing Flanges

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

(Same requirements for right side)

Note: The nailing anges, combustible

members and screw heads in areas directly adjacent to the nailing anges are EXEMPT from the 1/2-inch clearance to combustible requirements for the rebox outer wrapper. Combustible framing may be in direct

contact with the nailing ﬂanges and may

be located closer than 1/2 inch from screw heads and the rebox wrapper in areas adjacent to the nailing anges. Frame the

opening to the exact dimensions speciﬁed in the framing details in these Installation

Instructions.

Figure 11

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

(330)

(406)

6-1/2 (165)

Inches

(millimeters)

1-1/2

(38)









(330)

(406)

6-1/2 (165)

Inches

(millimeters)





LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

FRAMING SPECIFICATIONS

Framing should be constructions of 2x4 or larger lumber.

LSM40ST A

in 52-1/16 47-5/16 75-1/2 26-5/16 6

(mm) (1322) (1202) (1918) (668) (152)







 Dimension B is from replace base to top framing member.  Dimension C is from replace base to centerline of horizontal vent pipe.

Minimum vent framing: 2 ft vertical vent and one 90° elbow. For other venting conﬁgurations, see Step 3, INSTALL VENTING SYSTEM.

 1/2-inch board for platform (shown in gray).  Dimension E is a 6-inch clearance from replace base to outdoor

surface (e.g., deck, patio, lanai) that is required as a moisture barrier (not a combustible clearance) on outdoor side only.

Figure 12

INDOOR SIDE

Outdoor Surface (e.g., deck, patio, lanai)

OUTDOOR SIDE*

*For indoor/outdoor installations, the control side

of the ﬁreplace must be installed on the indoor side.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

FIREPLACE DIMENSIONS

(shown with Outdoor Kit installed)

FIREPLACE COLLAR AND VENT SIZE

Fireplace Vent Collar and Vent Pipe (Coaxial DV) 8" Inner / 11" Outer

NOTE: All venting/termination systems (vertical and horizontal) require installation of the provided Vent Restrictor. See Page 14 for details.

inches

(millimeters)

27-7/16

(697)

3-15/32

(88)

26-3/16

(665)

inches

(millimeters)

13-3/32

(333)

inches

(millimeters)

12-5/16

(313)

25-9/32

(642)

5-13/32

(137)

Fireplace Vent Collar

8" Inner / 11" Outer

7-5/16

(186)

Top View

34-3/4

(883)

5-3/32

(130)

46-19/32

(1184)

19-17/32

Figure 13

(496)

7 (178)

Control Switch Wires Knock-Out

Left Side View

Gas Inlet

J-Box

29-19/32

(752)

Front View (opposite valve access side)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

41-1/2

(1054)

33-3/4

(857)

50-1/2

(1283)

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Step 2. ROUTE GAS LINE

NOTICE: For indoor/outdoor installations,

the CONTROL SIDE of the ﬁreplace must be installed on the INDOOR side.

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

of the right side framing as shown in Figures 14 and 15. 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 24).

The incoming gas line should be piped into

the valve compartment and connected in one of the two methods as shown in Figure 36 on Page 24.

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) or CAN/CSA-B149.1

- latest edition (Canada).

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

IMPORTANT: It is critical that a licensed installer perform this step strictly per NFPA.

We recommend that a qualified, licensed

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.

Notes:

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

shutoff valve (see Figure 36 on Page 24).

• See Massachusetts Requirements on Page 4 for additional requirements for installa-

tions in the state of Massachusetts in the

USA.

• The gas supply line should not be connected

to the appliance until Step 6 (Page 24).

• 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.

• Sediment Trap: It is recommended to install a sediment trap in the supply line as close as

possible to the appliance (see Figure 36 on Page 24). Appliances using propane should

have a sediment trap at the base of the tank.

• Check with local building ofcial for local code requirements (such as whether below-

grade penetrations of the gas line allowed,

etc.).

7”

(178 mm)

Right Side Front Corner

(Valve Side) Of Fireplace Framing

Figure 14: INDOOR / INDOOR

1-1/2”

(38 mm)

7”

(178 mm)

Right Side Front Corner

(Valve Side) Of Fireplace Framing

19-1/2"

(495 mm)

19-1/2"

(495 mm)

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

Table 6

Propane

Gas

IMPORTANT NOTE REGARDING

PROPANE INSTALLATIONS

Using a propane tank smaller than 100 lbs may create pressure loss and insufﬁcient fuel delivery, which can cause sooting, severe delayed ignition, or other malfunctions (ref. NPFA 58).

Any damage as a result of insufﬁcient tank size or other improper installation is NOT covered under the limited warranty.

Figure 15: INDOOR / OUTDOOR

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Step 3. INSTALL VENT SYSTEM

General Information

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

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

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

These ﬁreplaces must be vented

directly to the outside.

Vent Restrictor Kit

Vent Restrictor Assembly for Horizontal Termination Systems

For systems with horizontal termination, use only the vent restrictor base.

The vent system may not service multiple ap-

pliances 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 en-

closing wall at any of the joints in the vent pipe.

Vent Restrictor Assembly and Installation

All vent systems require installation of a vent restrictor. A vent restrictor kit is provided with

the replace (packaged inside the rebox) and includes one base, two wings, and four screws (see Figure 16A).

1. Assemble the vent restrictor components

according to the type of termination and length of vent run, as shown in Figures 16B and 16C.

2. Install the vent restrictor in the appliance top ﬂue outlet, as shown in Figure 16D. The

vent restrictor is held in place by friction only.

Vent Restrictor Assembly for Vertical Termination Systems

For systems with vertical termination, use the four provided

screws to attach the two wings to the base in the applicable position based on length of vertical run, as shown below.

Assembly for vertical termination with 6–10 ft vertical runs:

Note: When possible, install the vent

restrictor through the top of the appliance vent outlet BEFORE installing the vent system. (It is possible to install the vent restrictor from inside the ﬁrebox after vent system installation; however, doing so requires removing the ﬁrebox bafﬂe.)

Vent Termination (Vertical or Horizontal)

With the appliance secured in framing, determine whether to terminate the venting

vertically (through the roof) or horizontally (through the wall).

• For Vertical (Roof) Termination Systems,

see Pages 15–18.

• For Horizontal (Wall) Termination Systems,

see Pages 19–22.

See Page 34 for a list of

approved venting components.

(1) Vent Restrictor Base

(2) Wings (4) Screws

Figure 16A Figure 16B

Vent Restrictor Installation

Applicable Vent Restrictor Assembly (per Figures 16B and 16C)

Inner Collar

Appliance Vent Outlet

Assembly for vertical termination with 11–40 ft vertical runs:

Assembly for vertical termination with 41–60 ft vertical runs:

Install applicable vent restrictor assembly (per Figures 16B and 16C)

into inner collar of appliance vent outlet.

Note: The vent restrictor is held in place by friction only.

Figure 16D

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 16C

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LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Vertical (Roof) Termination Systems

This section includes conﬁgurations for vertical

(roof) termination systems with either straight

vertical venting (see below and Page 18) and offset vertical venting (see Pages 16–18).

Secure Vent™ rigid vent pipe and termination

components are shown in the ﬁgures. The tables on Page 18 summarize each sys-

tem’s minimum and maximum vertical and horizontal length values.

For vertical (roof) termination, the minimum vent height above the roof and/or adjacent

walls is speciﬁed in ANSI Z223.1, latest edi-

tion (in Canada, the current CAN/CSA-B149.1 installation code) and by major building

codes. Always consult your local codes for speciﬁc requirements. A general guide to follow is the Gas Vent Rule (see Figure 3B

on Page 6).

Vertical Termination System with Straight Vertical Venting

Note: If not already done, install the provided vent restrictor before proceeding (see Page 14).

Determine the number of straight vent sections required. Available straight vent sections (and their effective lengths) are listed in

Table 7, below. See Page 34 for all venting components.

Plan the vent lengths so a joint does not occur at the intersection of ceiling or roof joists. Refer to the “VENT SECTION LENGTHS”

charts at right.

Vertical Termination System with Straight Vertical Venting

Termination

Max. 60 ft

(18 m)

Min. 6 ft

(1.8 m)

Figure 17

Flashing and Storm Collar

Min. 1 in (25 mm) Clearance to Combustibles

Firestop/Spacer

Secure Vent Vent Sections

(SV8L6, SV8L12, SV8L24, SV8L36, SV8L48)

Available Straight Vent Sections

Cat. No. Model No. Description Effective Length

H2250 SV8L6 6 in (152 mm) Vent Section 4.5 in (114 mm) H2251 SV8L12 12 in (305 mm) Vent Section 10.5 in (267 mm) H2252 SV8L24 24 in (610 mm) Vent Section 22.5 in (572 mm)

Metric

Conversion

Inches x 25.4 = mm. Inches x 2.54 = cm. Inches x 0.0254 = m.

H2253 SV8L36 36 in (914 mm) Vent Section 34.5 in (876 mm) H2254 SV8L48 48 in (1219 mm) Vent Section 46.5 in (1181 mm)

Table 7 See Page 34 for a list of all approved venting components.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Min. 13 in

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Vertical Termination System with Offset Vertical Venting

Note: If not already done, install the provided vent restrictor before proceeding (see Page 14).

Analyze the vent routing and determine the

quantities of vent sections and number of elbows required. Refer to Vertical Termination

System Figures and Tables on Page 18 to select 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 on Page 15 for an aid in selecting length

combinations. Elbows are available in 90° and 45° congurations. See Figure 21 on Page 17 for the SV8E45 and SV8E90 elbow dimensional

speciﬁcations. Where required, a telescopic vent section

(SV8LA) 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 ﬁxed

length pieces develops a joint in a undesirable location, or will not build up to the required

length. The SV8LA Telescopic Vent Section has

an effective length of from 1-1/2" (38 mm) to 6-3/4" (171 mm). The SV8LA 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 SV8 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 4" (102 mm) on top, 1" (25 mm) on sides and 1" (25 mm) on the bottom.

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, 13" x 13" (330

mm x 330 mm) inside dimensions, about this center mark (Figure 18).

Roof Framing

Min. 13 in (330 mm)

Ceiling Framing

Plumb Bob

Figure 18

(330 mm)

B. Attach vent components to appliance. Secure Vent™ SV8 direct-vent system compo-

nents are unitized concentric pipe components featuring positive twist lock connections (see Figure 19).

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.

Align four dimples in upper vent section with inlets of four locking incline channels on lower vent section or appliance collar.

Twist upper vent section clockwise

Arrow

Lower Vent Section or Appliance Collar

until arrows and dimples align.

Dimple

Locking Incline Channel

Connected Vent

Sections

Arrow

Figure 19

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 inlet of the four inclined channels on the collar (refer to Figure 19). 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 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 of the vertical vent ﬁgures

and tables.

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 19.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

D. Install ﬁrestop/spacer at ceiling.

When using Secure Vent, use SV8BF 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. When running vertical chimney

sections, remember to maintain 1" (25 mm) clearance to combustibles, framing members, and attic or ceiling insulation. Attic insulation shield (H3908) may be used to obtain the required clearances indicated here. See installation accessories on Page

34. The gap between the vent pipe and a vertical ﬁrestop can be sealed with noncombustible caulking.

E. Support vertical vent run sections.

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 conventional

plumber’s tape (not provided). Secure the plumber’s tape to the framing members with

nails or screws.

Loop the plumber’s tape around the vent,

securing the ends of the tape to the framing. If desired, use #6 x 1/2" sheet metal screws to secure the support straps to the vent pipe. See Figure 20.

Blocking

Support Straps

(Plumber’s Tape)

Max.

8 ft (2.4 m)

0 in (0 mm) minimum clearance to spacers

Figure 20

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Storm Collar

Vertical Termination System with Offset Vertical Venting (continued)

F. Change vent direction to horizontal/ inclined run.

At any transition to or from a horizontal/

inclined run, install the elbows (SV8E45, SV8E90; see Figure 21) 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, to avoid the possibility of unlocking any previously connected vent section (see Figures

19 and 21).

(153 mm)

360° Swivel Joint (SV8E45) 45° Elbow

360° Swivel Joint (SV8E90) 90° Elbow

10"

(254 mm)

H. Frame roof opening.

Identify location for vent at the roof. Cut and/ or frame opening per Roof Framing Chart (see

Figure 22).

Framing Dimensions for Roof

Pitch C D

0/12

6/12

12/12

13 in

(330 mm)

13 in

(330 mm)

13 in

(330 mm)

13 in

(330 mm)

15-1/2 in

(394 mm)

20-1/2 in

(541 mm)

Figure 22: Roof Framing

K. Install vertical termination.

The ﬁnal step involves installation of the vertical termination. Extend the vent sections to the

height as shown in “Vertical Vent Termination Clearances” on Page 6.

The vertical termination (Figure 24) installs in the same manner as other Secure Vent™ sections. Align the termination over the end of

the previously installed section, adjusting the

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

Figure 21

G. Continue installation of horizontal/ inclined sections.

Continue with installation of the straight vent sections in horizontal/inclined run as de-

scribed in Step C. Install support straps every 3 ft (914 mm) along horizontal/inclined vent runs using conventional plumber’s tape (see Page 19, Figure 28).

NOTICE: It is important to install

horizontal runs on a steady, (i.e., no “dips”), slightly positive incline of approximately 1/4 inch rise-per-foot (20 millimeters rise-per-meter) horizontal, in a direction away from the ﬁreplace. (Slightly smaller rise-per-foot run ratios

are acceptable.) Use a carpenter’s level to measure from a constant surface, and

adjust support straps as necessary.

Note: It is important to maintain the required clearances to combustibles: 1" (25 mm) at all sides for all vertical runs; and 4" (102 mm) at the top, 1" (25 mm) at sides, and 1" (25 mm) at the bottom for all horizontal/ inclined runs.

I. Install roof ﬂashing.

Extend the vent sections through the roof structure. Install the roof ﬂashing over the vent section and position such that the vent

column rises vertically (use carpenters level)

(Figure 23 ). Nail along perimeter to secure

ashing or adjust roong to overlap the ashing edges at top and sides only and trim where

necessary. Seal the top and both sides of the

ﬂashing with waterproof caulking.

J. Install storm collar.

Install the storm collar, supplied with the

ashing, over the vent/ashing joint (see

Figure 23). Loosen the storm collar screw. Slide collar down until it meets the top of the

ashing. Tighten the adjusting screw. Apply non-combustible caulking or mastic around the circumference of the joint to provide a

water tight seal.

Storm

Flashing

Collar

Figure 24

If the vent system extends more than 5 ft (1.5

m) above the roof ashing, stabilizers may be

necessary.

Additional screws may be used at section joints for added stability.

Guide wires may be attached to the joint for additional support on multiple joint congurations.

Figure 23

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

VERTICAL TERMINATION SYSTEM FIGURES AND TABLES

Secure Vent™ rigid vent pipe and termination

components are shown in the ﬁgures. Note: Two 45-degree elbows may be used

in place of one 90-degree elbow. If using 45-degree elbows, follow the same rise-torun ratios as shown for 90-degree elbows.

NOTICE:

 Secure Vent Vertical Firestop/Spacer

(SV8BF) must be used anywhere vent pipe passes through a combustible ﬂoor or ceiling. Secure Vent Horizontal Firestop/Spacer (SV8HF4) must be used anywhere vent pipe passes through a combustible wall.

 It is important to install horizontal runs

on a steady, (i.e., no “dips”), slightly positive incline of approximately 1/4 inch rise-per-foot (20 millimeters rise-per-meter) horizontal, in a direction away from the ﬁreplace. (Slightly

smaller rise-per-foot run ratios are acceptable.) Use a carpenter’s level to measure from a constant surface, and

adjust support straps as necessary.

Vertical Termination System with Straight Vertical Venting

Vertical Termination System with Offset Vertical Venting using Two 90-Degree Elbows

Vertical Firestop/Spacer (SV8BF)

H max. V + V1 min.

feet (meters) feet (meters)

10 (3.1) 2.5 (0.762) 15 (4.65) 3.5 (1.06)

20 (6.2) 4.5 (1.37)

V + V1 + H = 40 ft (12.4 m) max. V + V1 = 11 ft (3.3 m) min.

Example: A 20-ft horizontal vent run (H + H1) would require 4.5 ft min. vertical vent (V + V1).

Figure 26

*Install the provided Vent Restrictor (see Page 14).

Ceiling

Firestop/Spacer

(SV8BF)

*Install the provided Vent Restrictor (see Page 14).

Figure 25

60 ft (18.3 m) max.

6 ft (1.83 m) min.

Vertical Termination System with Offset Vertical Venting using Three 90-Degree Elbows

Vertical

Firestop/Spacer (SV8BF)

Horizontal Firestop/Spacer (SV8HF4)

H + H1 max. V + V1 min.

feet (meters) feet (meters)

10 (3.1) 2.5 (0.762) 15 (4.65) 3.5 (1.06)

20 (6.2) 4.5 (1.37)

H + H1 = 20 ft (6.2 m) max. V + V1 = 11 ft (3.3 m) min. V + V1 + H + H1 = 40 ft (12.4 m) max.

Example: A 20-ft horizontal vent run (H + H

)

would require 4.5 ft min. vertical vent (V + V1).

Figure 27

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

*Install the provided Vent Restrictor (see Page 14).

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Horizontal (Wall) Termination Systems

This section includes conﬁgurations for horizontal venting systems with horizonal termina-

tion (terminates through an outside wall) (see Figures 31–33 on Pages 21–22).

The tables on Pages 21 and 22 summarize each

system’s minimum and maximum vertical and horizontal length values.

Note: Building codes limit or prohibit horizontal termination in speciﬁc areas. For location guidelines, see Figure 5 on Page 7.

Secure Vent™ pipe applications are shown in

the illustrations. Secure Vent SV8 direct-vent system components are unitized concentric pipe components featuring positive twist-lock connection (see Figure 19 on Page 16). 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. See Page 15 for a list of available straight vent sections and their effective lengths (Table 7), as well as “VENT SECTION LENGTHS” charts. See Page 34 for a list of all approved venting components.

Plan the vent lengths so that a joint does not

occur at the intersection of ceiling or roof joists. Make allowances for elbows as indicated in Figure 21 on Page 17.

Maintain a minimum 1" (25 mm) clearance to combustibles on the vertical sections. Clearances for horizontal runs are 4" (102 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 ex ter ior wal l ac cor ding to the di men sions shown in Figure 12 on Page 11.

Cut and/or frame an opening 16" x 13" (406 mm x 330 mm) inside dimensions, with 10" above center and 7" below 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, 13" x

13" (330 mm x 330 mm) inside dimensions, about this center (see Figure 18 on Page 16).

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 (see

Figure 19 on Page 16).

Horizontal Termination System with Horizontal/Inclined Run

Elbow

Support

Brackets

Ceiling

Horizontal / Inclined Run

Vertical Firestop/ Spacer (SV8BF)

Min. 2 ft (610 mm) Vertical

Section and One 90° Elbow

Support the vertical portion of the venting system every 8 ft (2.4 m) above the ﬁreplace vent outlet.

Support Bracket Spacing every 3 ft (914 mm)

Fireplace

SV8L6/12/24/36/48 Vent Sections

Building

Support

Framing

SV8E90

Vertical

Rise

Figure 28

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

19 on Page 16.

F. Install ﬁrestop/spacer at ceiling.

When using Secure Vent, use SV8BF vertical 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

G. Support the vertical run sections. See Step E on Page 16. On the vertical run, support the venting system

every 8 ft (2.4 m) above the replace vent outlet with eld provided support straps (Plumber's tape). Attach the straps to the vent pipe and secure to the framing members with nails or

screws (see Figure 20 on Page 16).

H. Change vent direction.

At transition from or to a horizontal/inclined

run, install the SV8E45 and SV8E90 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 19 on Page 16).

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 28.

NOTICE: It is important to install horizontal runs on a steady, (i.e., no “dips”), slightly positive incline of approximately 1/4 inch rise-per-foot (20 millimeters rise-per-meter) horizontal, in a direction away from the ﬁreplace. (Slightly smaller

rise-per-foot run ratios are acceptable.)

Use a carpenter’s level to measure from a

constant surface, and adjust support straps

as necessary.

Termination (SV8HTS4)

Exterior Wall

Termination (SV8HTS4)

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

It is important to maintain the required clearances to combustibles: 1" (25 mm) at all sides for all vertical runs; and 4" (102 mm) at the top, 1" (25 mm) at sides, and 1" (25 mm) at the bottom for all horizontal/inclined runs.

Use a carpenter’s level to measure from a

constant surface and adjust the support straps

as necessary.

J. Assemble vent run to exterior wall. If not previously measured, locate the center of

the vent at the exterior wall. Prepare an open-

ing as described in Step B (previous page). Assemble the vent system to point where the

terminus of the last section is within 5 in. (127

mm) to 8-1/2 in. (216 mm) inboard of the

exterior surface to which the termination is to

be attached, see Figure 30 (below) and Table 8 (Page 21).

If the terminus of the last section is not within this distance, use the telescopic vent section (SV8LA) as the last vent section. For wall thicknesses greater than that shown in Figure 30, refer to Table 8 on Page 21. This table lists 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 - SV8RCH - provided

with the termination) to the vent section or telescoping vent section), or elbow as shown in

Figure 29 in the same manner as any SV vent component (refer to Step E, previous page).

L. Install Firestop/Spacer at exterior wall. When using the square termination, install

Secure Vent™ Firestop/Spacer (SV8HF4) over the opening at the exterior side of the framing,

long side up, with the 4-inch spacer clearance

at the top as shown in Figure 29, and nail into place.

M. Install the Square Termination (SV8HTS4). For the last step, from outside the exterior

wall, slide the collars of the termination onto the adaptor (the outer over the outer and the

inner inside 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

horizontal termination must not be recessed into the exterior wall or siding by more than the 1-1/4" (32 mm) as shown in Figure 30.

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.

16 in

(406mm)

6-1/2 in

(165mm)

Adaptor

SV8RCH

6- to 48-inch Vent Section or Telescopic Vent Section

Firestop/Spacer (SV8HF4) shown on exterior side of wall

13 in

(330mm)

1 in (25mm)

Note: Centerline of vent piping is NOT the same as centerline of framed opening.

Base of Appliance

Square Termination (SV8HTS4)

4 in (102 mm)

1 in (25.4 mm)

Figure 29: Installing Square Horizontal Termination

Min. 5 in (127 mm) wall thickness

Max. 8-1/2 in (216 mm)

Siding

Interior surface of ﬁnished wall

Maximum extent of vent run

sections relative to exterior

surface of framing

Last vent section

(If necessary, use

telescopic vent

section SV8LA.)

wall thickness

Exterior Surface of Siding

Exterior Surface of Framing

5 to 8-1/2 in (127−216 mm)



Square Termination SV8HTS4

Stucco

_________

Adaptor

SV8RCH

 For wall thicknesses greater than

8-1/2 in (216 mm), see Table 8.

Horizontal Square Termination SV8HTS4

Venting Connection and Exterior Wall Recessing

Figure 30

Horizontal terminations have been designed to perform in a wide range of weather conditions. Our terminations meet or exceed industry standards.

When selecting the locations of your horizontal terminations, do not place the termination where water from eaves and adjoining rooﬂines may create a heavy ﬂow of cascading water onto the termination cap. If the cap 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 these installation instructions for the termination, including the use of silicone caulking where required.

Square Termination SV8HTS4

Max. 1-1/4 in recess of square termination into exterior ﬁnishing material

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

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

Required Venting Components (based on Exterior Wall Thickness)

when using Horizontal Square Termination Kit (SV8HTS4)

Exterior Wall Thickness Required Components

5 to 8-1/2 in (127 to 216 mm) • Termination Kit

(SV8HTS4)

HORIZONTAL TERMINATION SYSTEM FIGURES/TABLES

Note:

• Secure Vent™ rigid vent pipe and termination components are shown

in the ﬁgures.

• Two 45-degree elbows may be used in place of one 90-degree elbow. If using 45-degree elbows, follow the same rise-to-run ratios as shown for 90-degree elbows.

9-3/4 to 14 in (248 to 356 mm) • Termination Kit (SV8HTS4)

• 6-in Vent Section (SV8L6)

6-3/4 to 15-1/4 in (171 to 387 mm) • Termination Kit

(SV8HTS4)

• Telescopic Section (SV8LA)

11-1/4 to 19-3/4 in (286 to 502 mm) • Termination Kit (SV8HTS4)

• Telescopic Section (SV8LA)

• 6-in. Vent Section (SV8L6)

Table 8

NOTICE:

 Secure Vent™ Vertical Firestop/Spacer (SV8BF) must be used

anywhere vent pipe passes through a combustible ﬂoor or ceiling. Secure Vent Horizontal Firestop/Spacer (SV8HF4) must be used anywhere vent pipe passes through a combustible wall.

 It is important to install horizontal runs on a steady, (i.e., no

“dips”), slightly positive incline of approximately 1/4 inch riseper-foot (20 millimeters rise-per-meter) horizontal, in a direction away from the ﬁreplace. (Slightly smaller rise-per-foot run ratios

are acceptable.) Use a carpenter’s level to measure from a constant surface, and adjust support straps as necessary.

HORIZONTAL TERMINATION SYSTEM WITH HORIZONTAL/INCLINED RUN USING ONE 90-DEGREE ELBOW

(elbow connection not directly at appliance)

Note: The provided vent restrictor is required in all venting systems. See Page 14 for settings.

Table C

H Maximum

V Minimum

feet (meters) feet (meters)

3.5 (1.07) 2.5 (0.762)

6.5 (1.98) 3.5 (1.07)

8.5 (2.6) 4.5 (1.37)

10.5 (3.2) 5.5 (1.68)

12.5 (3.8) 6.5 (1.98)

14.5 (4.4) 7.5 (2.3)

16.5 (5.0) 8.5 (2.6)

18.5 (5.6) 9.5 (2.9) 20 (6.0) 10 (3.0)

V + H = 40 ft (12.4 m) max. H = 20 ft (6.2 m) max.

Example: 20 feet of horizontal vent run (H) requires a minimum 10 feet of vertical vent (V).

Square

Termination

(SV8HTS4)

shown

Horizontal Firestop/Spacer (SV8HF4)

Vertical Firestop/Spacer (SV8BF)

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

Figure 31

Horizontal

Firestop/Spacer

(SV8HF4)

Vertical

Firestop/Spacer

(SV8BF)

Horizontal

Firestop/Spacer

(SV8HF4)

Vertical

Firestop/Spacer

(SV8BF)

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

HORIZONTAL VENT FIGURES/TABLES (continued)

HORIZONTAL TERMINATION SYSTEM WITH HORIZONTAL/INCLINED RUN USING TWO 90-DEGREE ELBOWS

(Elbow connection not directly at appliance)

Note: The provided vent restrictor is required in all venting systems. See Page 14 for settings.

Horizontal Firestop/Spacer

(SV8HF4)

Horizontal Firestop/Spacer

(SV8HF4)

Example: If 20 feet of (H+H1) horizontal vent run is needed, then 10 feet minimum of (V) vertical vent will be required.

Vertical

Firestop/Spacer

(SV8BF)

See Table 8 on Page 21 as an aid in selecting venting components for a particular range of exterior wall thicknesses.

+ H

feet (meters) feet (meters)

3.5 (1.07) 2.5 (0.762)

6.5 (1.98) 3.5 (1.07)

8.5 (2.6) 4.5 (1.37)

10.5 (3.2) 5.5 (1.68)

12.5 (3.8) 6.5 (1.98)

14.5 (4.4) 7.5 (2.3)

16.5 (5.0) 8.5 (2.6)

18.5 (5.6) 9.5 (2.9) 20 (6.0) 10 (3.0)

V + H + H1 = 40 ft (12.4 m) max.

H + H

Table D

max.

= 20 ft (6.2 m) max.

V min.

Figure 32: Horizontal Termination with Two 90-Degree Elbows

HORIZONTAL TERMINATION SYSTEM WITH HORIZONTAL/INCLINED RUN USING THREE 90-DEGREE ELBOWS

(Elbow connection not directly at appliance)

Note: The provided vent restrictor is required in all venting systems. See Page 14 for settings.

H V + V

V = 2.5 ft (0.762 m) min.

V + V

Table E

+ H1 = 20 ft (6.2 m) max.

+ H + H1 = 40 ft (12.4 m) max.

= 11 ft (3.35 m) min.

See Table 8 on Page 21 as an aid in selecting venting components for a particular range of exterior wall thicknesses.

Figure 33: Horizontal Termination with Three 90-Degree Elbows

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

BL = Blue

G = Green

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 adéquatement 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 34 and 35. 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.

Electronic Wiring

(See Figures 34 and 35)

Note: The electronic appliance must be connected to the main power supply.

1. Route a 3-wire, 120 Vac, 60 Hz, 1ph power

supply to the appliance junction box.

2. Remove the electrical inlet cover plate from

the side of the unit by removing the plate's

securing screws (see Figure 13, Page 12).

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

Tab Intact

Green Ground Screw

Green

Neutral Side of Receptacle

White

Tab Intact

Hot Side of Receptacle

power supply wire to the common terminal of the outlet as shown in Figures 34 and 35.

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.

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

Step 5. REMOVE GLASS DOOR ASSEMBLY (ON CONTROL SIDE)

If not already done, remove the glass door

assembly on the control side of the replace (see Page 29).

Ground - Green Neutral - White

120 VAC - Black

Junction Box

Black

J-BOX / RECEPTACLE

WIRING

120V, 60HZ, 1PH

Field Wired

Factory Wired

Junction Box

120V AC

Hi-Temp Sleeve

Cable Harness 102661-01

Wiring Color Code

B = Black

BR = Brown

Figure 35: Junction Box Wiring

(See Figure 35 for detailed drawing of junction box / receptacle wiring.)

ELECTRONIC WIRING DIAGRAM FOR GRAVITY VENT FIREPLACES

Proflame Valve

Electronic Modulation

VENT UNITS

Hot

Neutral

Ground

Wall Receiver

GY = Gray O= Orange

AC/DC

Power Adaptor

PU = Purple W = White

R = Red Y = Yellow

THIS CONNECTOR NOT

USED ON GRAVITY

Pilot Tube

DFC Wire Harness 102662-01

Unit Mounted Rocker Switch OFF (o) = Intermittent Pilot Mode ON (-) = Standing Pilot Mode

Electronic Pilot Assembly

Pilot Ground Wire

Igniter Rod

Spark Wire Cable

Pilot Sensor Cable

Hood

Proflame DFC Board

Flame Sensor

Figure 34: Electronic Wiring Diagram for Montebello Gravity Vent Fireplaces

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Min

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Step 6. CONNECT 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 36 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; however, Canadian

requirements vary depending on local codes. See Figure 36 for ﬂex-line description. The

ex-line is rated for both natural and propane

gas. A manual shut off valve is also provided with the ﬂex-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 glass door assembly on

the control side (see Page 29) and the access plate (see Figure 37).

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

NPT thread gas supply inlet.

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.

Secure all joints tightly using appropriate tools and sealing compounds (ensure propaneresistant compounds are used in propane applications). Seal around gas line to prevent cold air leakage. Use sealants approved by local codes for the application.

Test All Connections for Gas Leaks (Factory and Field)

WARNING

Never use an open ﬂame to check for leaks.

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 effec-

tive 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. See the lighting instruc-

tions label in the replace control compartment or Care and Operation Instructions.

B. Brush all joints and connections with the gas

leak test solution to check for leaks. If bubbles

are formed, or gas odor is detected, turn the receiver or remote control 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. Reinstall the access plate, making certain the

gasket has not been damaged.

Right Side

Modesty Panel

Access Panel

Main Gas

Shut-Off Valve

Gas Valve

ON/OFF Switch*

Control Compartment Access

*ON/OFF Switch - Switches from intermittent

ignition to a standing pilot (a standing pilot

stays lit when replace is off).

Figure 37

Figure 36

GAS CONNECTION

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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Step 7. INSTALL FIREBOX LINER PANELS

Install the ceramic or porcelain rebox liner

panels per the instructions provided in the kit

(ref. document P/N 506019-21).

NOTICE: Liner panels must be

installed before operating ﬁreplace.

Step 8. VERIFY APPLIANCE OPERATION

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

Make sure all ports are open and producing ame evenly across the burner.

If any ports are blocked (or partially blocked),

clean out the ports.

With the gas line installed, run initial system

checkout before closing up the front of the

unit. Follow the pilot lighting instructions provided in the Care and Operation Instructions.

Note: Lighting instructions also can be found on the lighting label tied to the bracket above the gas valve. To access the tag, reach into the right side opening (see Figure 37 on Page 24).

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 on Page 30.

Subsequent lighting of the appliance will not

require such purging.

Inspect the pilot ﬂame (remove logs, if neces-

sary, handling carefully).

Appliance Checkout

To light the burner, refer to the lighting instructions in the Care and Operation Instruc-

tions or the lighting label tied to the bracket above the gas valve (behind the right panel).

Make sure the igniter lights the pilot. The

pilot ﬂame should engulf the ﬂame sensor, as shown in Figure 38.

PILOT ASSEMBLY

Proper Pilot Flame Appearance

Igniter Rod

Pilot Hood

Flame Sensor

Pilot Nozzels

Figure 38

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Step 9. INSTALL VOLCANIC STONE, GLOWING EMBERS, AND LOGS

9-1. Remove mesh pull screens, modesty panel, and glass door as-

sembly from one side of replace. See Page 29.

9-2. Locate materials (log set, bag of glowing embers, and bags of

volcanic stone).

Note: LOGS ARE FRAGILE! Handle with care to prevent breakage.

9-3. Install volcanic stone. Place some of the volcanic stone on the

rebox oor around the grate (the entire bag of volcanic stone will NOT be used).

Note: Do NOT place volcanic stone on burner.

9-4. Prepare and install glowing embers.

Note: This appliance is provided with enough glowing ember material for several applications. Do NOT use the entire contents of a new bag at one time.

a) Separate some of the glowing ember material into pieces about

the size and thickness of a dime (see Figure 39). Keep the

pieces ﬂuffed up, not matted.

IMPORTANT! Ember pieces must be

as SMALL and THIN as a dime.

b) Distribute the dime-sized pieces over the surface of the burner,

in the areas shown in Figures 40 and 41.

Note: To prevent ﬂame impingement and soot, do not use

more ember material than necessary.

c) For best glowing effect, replace ember material annually.

Note: Use only catalog number H8312 Glowing Embers with this ﬁreplace.

Bag of Glowing Embers

Separate glowing ember material into THIN, square, dime-sized pieces.

Figure 39: Preparation of Glowing Ember Material

Control Side

Figure 40: Placement of Glowing Ember Pieces

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.

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 volcanic stone, embers and logs.

The size and position of the log set was engineered

•

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.

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 installa-

•

tion 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.

Place embers in circled areas.

Control Side

(top view of burner shown)

• Place glowing ember material in circled areas ONLY.

• Do NOT place glowing ember material over main ﬂame gas ports.

• To prevent ﬂame impingement and soot, do not use more ember

material than necessary.

Figure 41: Placement of Glowing Ember Pieces

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

9-5. Install logs (reference Figure 42 and Table 9 ).

Note: Logs are FRAGILE! Handle with care to prevent breakage.

Left Rear Log

Left Front Log

Center Rear Log

Center Log

Right Rear Log

Right Front Log

Figure 42: Top View of Logs

LOG SET

Item* Description Item* Description

A B C

Log, Center Log, Right Rear Log, Left Front

D E F

Log, Top Right Log, Top Left Log, Top Front

*Item letters correspond to photos.

FIREBOX ACCESSORIES/PARTS

Cat. No. Model Description

H8312 PGE Bag of Glowing Embers 80L42 FDVS Bag of Volcanic Stone

Table 9

9-6. Place rectangular notches on underside of Center Log A (Figure

44) over Boss #1 and Boss #4 (Figure 43).

Landing

Figure 44

9-7. Place notch on underside of Right Rear Log B (Figure 45 ) over

Boss #2 (Figure 43).

Place opposite end of Right Rear Log B (Figure 45) on Landing for

Log B (see Figure 43).

Landing for Log D

(see Step 9-9 and Figure 47 on next page)

Boss #1 Boss #2

Boss #3 Landing for Log C

Landing for Log B

[CONTROL SIDE]

Figure 43: Burner Bosses and Landings

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Boss #4

Figure 45

9-8. See Figures 43 and 46. Place notch on underside of Left Front

Log C over Boss #3.

Place opposite end of Left Front Log C on Landing for Log C (see

Figure 43).

Figure 46

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

9-9. Place groove on underside of Top Right Log D over the grate as

shown in Figure 47.

The middle section of Log D will rest on the landing on Log B

(labeled as “Landing for Log D” in Figure 45).

Groove Location

Figure 47

9-10. See Figure 48. Place hole on underside of Top Left Log E over pin

on Center Log A.

9-11. See Figure 49. Place groove on underside of Top Front Log F over

the grate ﬁnger. Rest the other end of the log on the Landing on Center Log A.

Landing

Groove Location

Figure 49

Figure 48

[DETAIL]

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Step 10. INSTALL GLASS DOORS, MESH PULL SCREENS, AND MODESTY PANEL

WARNING

HOT GLASS WILL CAUSE BURNS.

DO NOT TOUCH GLASS UNTIL COOLED.

Install only when ﬁreplace is OFF and

•

COLD

•Fireplace surfaces get EXTREMELY HOT!

•The glass on the front of the ﬁreplace

reaches EXTREMELY HIGH temperatures and can cause severe burns if touched. Even after the gas is turned off, ﬁreplace surfaces remain extremely hot.

CAUTION

RISK OF PERSONAL INJURY

OR PROPERTY DAMAGE.

• Do NOT abuse glass doors by striking or slamming shut

• Never operate ﬁreplace with glass door assemblies removed.

These direct-vent appliances are designed

to operate only when both glass door assemblies are installed. Generally, the glass door assemblies should not be

removed, except when access to compo-

nents within the rebox is required.

• Securely tighten door latch screws when

reinstalling glass door assemblies to prevent doors from falling out.

• Handle glass door assemblies with extreme care. Replace damaged glass door assemblies with approved replacement assemblies only.

The door assemblies on this replace

contain ceramic glass. Handle with care to prevent damage. If the door frame

or glass on either assembly becomes

damaged, replace the entire glass door

assembly with a manufacturer-approved replacement assembly only. Do not attempt to substitute any materials used on door assemblies or replace cracked or broken glass with any other materials.

Installing Glass Doors, Mesh Pull Screens, and Modesty Panel

(see Figure 50)

Note: These instructions do NOT apply to the Outer Glass Door provided in the Outdoor Kit (for indoor/outdoor installations).

1) Install one of the glass doors, as follows: a) Retrieve the glass door. Visually inspect

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

irregularities, and seated ﬁrmly.

b) Position the door in front of the rebox

opening, with the top of the door held away from the ﬁreplace (see Figure 50).

c) Lower the bottom of the door assembly

onto the bottom door track, engaging and centering it in the base channel, and then

gently swing the door up.

d) Using a #3 Phillips screwdriver, fasten the

door frame to the door latches with the

two (2) latch screws. The latches should

pull forward to engage the door frame.

Note: Securely tighten latch screws when

reinstalling glass door assembly.

2) Install the modesty panel on the top ange

of the glass door, as follows:

a) Grasp the modesty panel with both hands

(with the open hem facing down).

b) Engage it with the top ﬂange of the glass

door frame by pushing it all the way down. Make sure the installed modesty

panel is ﬁrmly in place.

3) Install the mesh pull screens, as follows: a) Retrieve the rod and two mesh pull

screens. If necessary, attach screens to rod.

b) Slowly insert the right end of the rod into

the hole in the right rod bracket.

c) Insert the left end of the rod into the slot

in the left rod bracket.

Removing Glass Doors, Mesh Pull Screens, and Modesty Panel

(see Figure 50)

1) Remove the mesh pull screens, as follows: a) Lift up the left end of the rod to disengage

it from the slot in the left rod bracket.

b) Slowly remove the right end of the rod

from the hole in the right rod bracket.

c) Set aside the rod and mesh pull screens

for later reinstallation.

2) Remove the modesty panel from the top

ange of the glass door by rmly pulling up on it with both hands until it is disengaged.

3) Remove one of the glass doors, as follows: a) See Figure 50. While holding the top of

the glass door frame in place, use a #3 Phillips screwdriver to remove the two

(2) screws securing the door frame to the two (2) door latches.

b) Carefully tilt the top of the glass door

frame away from the unit (as shown in

Figure 50), and then lift the door assembly up and out of the lower track.

c) Carefully place the glass door assembly

on a padded surface in a safe location to prevent damage.

Top Flange on Glass door assembly

Figure 50

Glass Door Latch (2)

Screws

• Only doors certiﬁed with the appliance shall be used.

• Seules des portes certiﬁées pour cet appareil doivent être utilisées.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Step 11. BURNER ADJUSTMENTS

Flame Appearance and Sooting

Proper ame appearance is a ame that is blue at the base and becomes yellowish-orange in the body of the ame. When the appliance is rst lit, the entire ame may be blue and will

gradually turn yellowish-orange during the ﬁrst 30 minutes of operation. After 30 minutes of

operation, if the ame 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.

• Propane models may exhibit ames which

candle or appear stringy. If this is present

and persists, adjust the air shutter to a more

OPEN 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.

Burner Air Shutter Adjustment

1. Light the appliance (follow lighting proce-

Procedure

WARNING

HOT GLASS WILL CAUSE BURNS.

DO NOT TOUCH GLASS UNTIL COOLED.

•Fireplace surfaces get EXTREMELY HOT!

•The glass on the front of the ﬁreplace

reaches EXTREMELY HIGH temperatures and can cause severe burns if touched. Even after the gas is turned off, ﬁreplace surfaces remain extremely hot.

CAUTION

RISK OF PERSONAL INJURY

OR PROPERTY DAMAGE.

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

• 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.

Volcanic Stone

Figure 51: Burner Flame Appearance — Control Side

2. Allow the burner to operate for at least 30

3. Adjust the air shutter using the lever on the

A minimum shutter setting is designed into

Note: See Figures 51 and 52 for proper burner ﬂame appearance.

Adjustment Lever

dure in Care and Operation Instructions or

on lighting label in control compartment).

minutes while continuously observing the

ﬂame to ensure that the proper ﬂame ap-

pearance has been achieved (see Figures 51 and 52).

lower right side of the rebox (Figure 51).

• For more OPEN air shutter, slide lever

to the RIGHT.

• For more CLOSED air shutter, slide lever to the LEFT.

the venturi by four 1/16"-inch tabs.

• If the ame appears weak or sooty (as

described on the previous page), adjust

the air shutter until proper ﬂame appearance is achieved.

• If ame stays lowered blue, incremen-

tally adjust the air shutter to a more

CLOSED position until proper ﬂame appearance is achieved.

Air Shutter

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

Volcanic Stone

Figure 52: Burner Flame Appearance — Opposite Control Side

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Min. 4 in*

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

FINISHING REQUIREMENTS

Wall Details - INDOOR SIDE(S)

Complete the ﬁnished interior wall. To install the appliance facing ﬂush with the ﬁnished wall, position framework to accommodate the thickness of the ﬁnished wall (Figure 53).

INTERIOR WALL FINISHING EXTERIOR WALL FINISHING

(102 mm)

Wall Stud

Combustible

Finished Wall

Materials

Header

Combustible

materials are

allowed on face

of appliance

above this point

Min. 1 in*

(25 mm)

2 ft Vertical

Vent and 90° Elbow

IMPORTANT!

Min. clearance above any

horizontal vent component

4 in (102 mm).

Wall Details - OUTDOOR SIDE

Complete ﬁnished exterior wall per the instructions provided

in the Outdoor Installation Kit and the instructions provided

here. To install the appliance facing ﬂush with the ﬁnished exterior wall, position framework to accommodate the thickness of the exterior ﬁnished wall (Figure 54).

(102 mm)

Wall Stud

Combustible Sheathing

Min. 1 in*

(25 mm)

2 ft Vertical

Vent and

90° Elbow

Header

Non-combustible sheathing required below this point.

Non-combustible

*Insulation is

NOT ALLOWED in clearance zones around vent components. Keep this area free from combustible materials.

Figure 53

Top of Appliance

Spacers

Top of Door Frame

FIREPLACE (side view)

Top of

Appliance

Top of Door Frame

Figure 54

See Page 4 for Cold Climate Insulation

and Page 9 for Clearances.

Spacers

FIREPLACE (side view)

Extend housewrap (building paper) to this point.

Note: Non-combustible sheathing and housewrap (building paper) should extend to U-channels on sides and bottom.

*Insulation is

NOT ALLOWED in clearance zones around vent components. Keep this area free from combustible materials.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Combustible Sheathing

Non-Combustible Board

B B

Non-Combustible Board

Combustible Sheathing

Non-Combustible Board

Sheathing Requirements

A B C*

12” (305 mm) 7” (178 mm) 6” (152 mm)

*Dimension “C” is clearance required from ﬁreplace base to surface (e.g., deck, patio, lanai) as a moisture barrier (not a combustible clearance) on outdoor side only.

Overhang

Siding

Trim

Exterior Minimum Clearances

Material A B C*

Vinyl 12” (305 mm) 35-1/2” (902 mm) 6” (305 mm)

Non-Vinyl 7” (178 mm) 35-1/2” (902 mm) 6” (305 mm)

*Dimension “C” is clearance required from ﬁreplace base to surface (e.g., deck, patio, lanai) as a moisture barrier (not a combustible clearance) on outdoor side only.

Figure 55: Sheathing

Figure 56: Exterior Clearances

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

Step 12. ATTACHING SAFETY-IN-OPERATION WARNINGS It is the installer’s responsibility to ensure these warnings are properly afﬁxed during installation. These warning labels are a

critical step in informing consumers of safe operation of this appliance.

ATTACHING SAFETY-IN-OPERATION WARNINGS

It is required that the set of safety instruction labels that have been furnished with the replace be afxed

to the operation and control points of the ﬁreplace. A

safety instruction label must be afxed to the receiver

wall switch plate where the ﬁreplace is turned on and off (See Figure A) and on the remote control handheld transmitter (See Figure B). To properly complete the installation of this ﬁreplace, locate the

multi-lingual adhesive labels provided with the Care

and Operation Instructions and proceed as follows:

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

by turning it on and off). Clean the wall receiver

plate thoroughly to remove any dust and oils.

Afx the label to the surface of the plate of the

wall receiver that controls the ﬁreplace (Figure A). Choose the language primarily spoken in the

home. If unknown, afﬁx the English language

label.

2. Locate the remote control transmitter and clean it thoroughly to remove any dust and

oils. Afx the label to the surface of handheld

transmitter (Figure B). Choose the language primarily spoken in the home. If unknown, afﬁx

the English language label.

3. If you are unable to locate the labels, please

call Lennox Hearth Products or your nearest Lennox Hearth Products dealer to receive ad-

ditional safety instruction labels free of charge. Cat. No. H8024 Replacement Label Kit

LENNOX HEARTH PRODUCTS 1-800-9-LENNOX

Note: English is red text on clear label. French and Spanish are white text on black label.

APPOSITION DES MISES EN GARDE RELATIVES À LA SÉCURITÉ D’UTILISATION

Il est impératif que le jeu d’étiquettes de sécurité qui ont été fournies avec le foyer soient collées à côté des dispositifs de contrôle du foyer. Une étiquette de sécurité doit être collée sur la plaque du récepteur mural contrôlant l’allumage du

foyer (voir Figure A) et sur le boîtier de la télécommande (Figure B). Pour achever l’installation correcte de ce

foyer, procédez comme suit avec les étiquettes adhésives en langues étrangères fournies avec les instructions d’utilisation et d’entretien :

1. Repérez le récepteur mural qui contrôle le foyer (vérifiez que l’interrupteur contrôle le fonction nement du foyer en le faisant basculer de Marche à Arrêt, et vice-versa). Nettoyez soigneusement

la plaque du récepteur mural pour éliminer la poussière et les traces de graisse ou d’huile. Collez l’étiquette sur

la surface de la plaque du récepteur mural qui contrôle

le foyer (Figure A). Choisissez la langue qui est principalement parlée dans la résidence du propriétaire. En cas de doute, collez l’étiquette en anglais.

2. Repérez la télécommande et nettoyez-la soigneusement pour éliminer la poussière et les traces

de graisse ou d’huile. Collez l’étiquette sur le boîtier

de la télécommande (Figure B). 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 distribu-

teur Lennox Hearth Products local pour recevoir gratuitement des étiquettes supplémentaires.

Étiquettes de remplacement, n° cat. H8024

LENNOX HEARTH PRODUCTS 1-800-9-LENNOX

Remarque : Le texte anglais est rouge sur un support transparent. Le texte français et espagnol est blanc sur un support noir.

COLOCACIÓN DE ADVERTENCIAS DE SEGURIDAD EN OPERACIÓN

Se requiere que el juego de etiquetas de instrucciones de seguridad que se incluyeron con la chimenea se coloque en los puntos de operación y control de la

misma. Se debe colocar una etiqueta de instrucciones

de seguridad en la placa del interruptor de pared del receptor desde el cual se enciende y se apaga la chimenea (ver la Figura A) y en el transmisor de control remoto (ver la Figura B). 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 receptor de pared que controla la chimenea (veriﬁque que el interruptor opera la

chimenea encendiéndola y apagándola). Limpie bien la placa del receptor de pared para quitar el

polvo y aceite. Pegue la etiqueta en la superﬁcie de la placa del receptor de pared que controla la chimenea (Figura A). Seleccione el idioma que

más se habla en la casa. Si no sabe cuál es, use

la etiqueta en inglés.

2. Identiﬁque el transmisor de control remoto y

límpielo bien para quitar el polvo y aceite. Pegue

la etiqueta en la superﬁcie del transmisor (Figura B). 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

Remote

Off

PRG

Figure A Figure B

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

DIAGRAMAS DE ETIQUETAS

DE SEGURIDAD

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

typ.

INSTALLATION ACCESSORIES

Listed Secure Vent™ Components

Cat.

No.

Model

No.

H8323 SV8HTS4 Horizontal Square

Termination with Firestop/Spacer (H8322) and Adaptor (H2267)

H2265 SV8VTR Vertical Termination

H2250 SV8L6 6 inch (152 mm)

Vent Section

H2251 SV8L12 12 inch (305 mm)

Vent Section

H2252 SV8L24 24 inch (610 mm)

Vent Section

H2253 SV8L36 36 inch (914 mm)

Vent Section

H2254 SV8L48 48 inch (1219 mm)

Vent Section H2255 SV8LA Telescopic Section H2256 SV8E45 45 Degree Elbow

Description

H2262 SV8SU Support Strap

H2263 SV8SP Support Plate

H3908 SV8ARSA Attic Insulation Shield

(adjustable 12” to 22”)

Open Top Shroud CTSO-46 for double terminations

Shroud: Open Top, Chase Top -

1 typ.

Open Top Shrouds CTSO-33 and CTSO-44 for single terminations

Inches (millimeters)

Cat. No. Model A B C D *E

H1985 CTSO-33

H1987

CTSO-44

H1986 CTSO-46

37-5/8

(955)

48-5/8 (1235)

37-5/8

(955)

48-5/8 (1235)

73 1/4

(1860)

(Open Top Shroud Termination Kit Instructions P/N 750193M)

7-1/2 (191)

24-1/2

typ.

(622)3 (76)

(622)3(76)

H2257 SV8E90 90 Degree Elbow

The following ﬂashings come packaged with a storm collar

H3236 SV8F Flat Roof Flashing

H2258 SV8FA Adjustable Flashing,

1/12 to 7/12 H2259 SV8FB Adjustable Flashing,

7/12 to 12/12 H3237 SV8SC6 Storm Collar

(pkg of 6)

H8322 SV8HF4 Firestop/Spacer,

Horizontal

(4-1-1 spacing) H2261 SV8BF Firestop/Spacer,

Vertical

(1-1-1 spacing)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Arch Top Shroud CTSA-33

Shroud: Arch Top, Chase Top -

Inches (millimeters)

Cat. No. Model A B C D

H1988 CTSA-33

(864)

(127)

(Arch Top Shroud Kit Instructions P/N 750194M)

(864)

Outdoor Kits

H7940 LSM40STODK Outdoor Kit with

Light-tint Glass

H8061 LSM40ST-ODKT Outdoor Kit with

Dark-tint Glass

(Outdoor Kit Instructions P/N 506019-20)

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS

GAS CONVERSION KITS

Gas conversion kits are available to adapt your

appliance from the use of one type of gas to another. These kits contain all the necessary components needed to complete the task, in-

cluding labeling that must be afxed to ensure

safe operation.

Kit part numbers are listed at right.

Refer to the instructions provided with the conversion kit when performing any gas conversion.

Gas Conversion Kits

Kit Model No. Kit Cat. No. Description

GCK-NP-LSM40ST H7951 Natural Gas to Liquid Propane Conversion Kit GCK-PN-LSM40ST H7952 Liquid Propane to Natural Gas Conversion Kit

Table 10

(Gas Conversion Kit Instructions P/N 506019-53)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • 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.

P/N 506023-12 Rev. B 05/2011

1508ElmHillPike,Suite108•Nashville,TN37210

Lennox Hearth LSM40ST-N, LSM40ST-P User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual