Lennox Hearth LSM40ST-N, LSM40ST-P User Manual

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.

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