Lennox MLDVT-40PM, MLDVT-35NM, MLDVT-30NM, MLDVT-45NE, MLDVT-30PM User Manual

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P/N 506015-02 Rev. E 06/2011

This manual is one of a set of two supporting this product. Refer to P/N 506017-01 for Care and Operation Instructions.

Ce manuel est disponible en francais, simplement en faire la demande. Numéro de la pièce 506223-03.

INSTALLATION INSTRUCTIONS

MLDVT Direct-Vent

 

 

Gas Fireplaces

 

 

 

 

 

MODELS

 

 

 

 

MILLIVOLT:

ELECTRONIC:

 

 

 

MLDVT-30NM

MLDVT-40NM

MLDVT-30NE

 

MLDVT-30PM

MLDVT-40PM

MLDVT-35NE

 

MLDVT-35NM

MLDVT-45NM

MLDVT-40NE

 

MLDVT-35PM

MLDVT-45PM

MLDVT-45NE

 

 

 

 

 

INSTALLER: Leave this manual with the appliance. CONSUMER: Retain this manual for future reference.

INstallateur : Laissez cette notice avec l'appareil. Consommateur : Conservez cette notice pour consultation ultérieure.

Report No. 100326540PRT-001

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.

WARNING/AVERTISSEMENT/AVISO

• HOT GLASS WILL CAUSE

• UNE SURFACE VITRÉE CHAUDE

• EL VIDRIO CALIENTE

BURNS.

PEUT CAUSER DES BRÛLURES.

CAUSARÁ QUEMADURAS.

• DO NOT TOUCH GLASS

• LAISSER REFROIDIR LA SURFACE

• USTED DEBE NUNCA

UNTIL COOLED.

VITRÉE AVANT D'Y TOUCHER.

TOCAR EL VIDRIO CALIENTE.

• NEVER ALLOW CHILDREN

• NE PERMETTEZ JAMAIS À UN ENFANT

• LOS NIÑOS DEBEN NUNCA

TO TOUCH GLASS.

DE TOUCHER LA SURFACE VITRÉE.

TOCAR EL VIDRIO.

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.

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.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

TABLE OF CONTENTS

 

 

Packaging..........................................

Page

2

Introduction.......................................

Page

2

General Information...........................

Page

2

Requirements for the

 

 

Commonwealth of Massachusetts..Page

4

New York City Approval.....................

Page

4

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

Page

5

Manufactured Home Requirements...

Page

5

Location

.............................................

Page

5

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

Page

6

Appliance ..........and Vent Clearances

Page

8

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

Page

9

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

Page

9

Detailed .................Installation Steps

Page

9

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

Page

9

Fireplace/Framing .......Specifications

Page

10

Step 2. Routing ...................Gas Line

Page

11

Step 3. Install .....the Venting System

Page 12

Vertical Termination ............Systems

Page 13

Vent Section .................Length Chart

Page 13

Vertical Vent ........Tables and Figures

Page

16

Horizontal ..........Termination System

Page

17

Horizontal ....Vent Tables and Figures

Page

20

Venting Using .......Flexible Vent Pipe

Page 23

Step 4. .........................

Field Wiring

Page

24

Step 5. ..Optional Blower Kit Wiring

Page 25

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

Page

26

Step 7.

Verifying Appliance Operation.Page

27

Step 8. ....................

Installing Logs

Page

28

Step 9. ..........Installing Glass Door

Page 31

Step 10. .............Burner Adjustments

Page 31

Step 11. .................Hood Installation

Page 33

Finishing .....................Requirements

Page

33

Step 12. Attaching Safety-in-

 

 

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

Page 34

Installation .....................Accessories

Page

35

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

Page 37

Please read and understand these instructions before beginning your installation.

PACKAGING

The assembled vented gas fireplace heater is packaged with:

One log set located in firebox area.

One envelope containing the literature package which consists of the care and operations manual, installation instructions, safety in operation warning labels and warranty; envelope is located in the control compartment.

One vent restrictor to be applied as shown on Page 12 ; restrictor is taped to the envelope.

One hood located behind the door assembly.

One bag of decorative volcanic stone located in the control compartment.

One bag of glowing embers located in the control compartment.

Introduction

The Millivolt appliances have a millivolt gas control valve with piezo ignition system. If any optional accessories that will require electrical power are to be installed, the electrical power must be provided at the time of appliance installation.

The Electronic appliances have an electronic intermittent pilot ignition system. External electrical power is required to operate these units. The battery back-up can be used in case of a power outage.

These vented gas fireplace heaters are sealed combustion, air-circulating gas fireplaces designed for residential applications.

Use Only These Approved Vent Components

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

Secure Vent™ Direct-Vent System Components manufactured by Security Chimneys International,

Secure Flex™ Flexible Vent Components manufactured by Security Chimneys International and

Z-FLEX™ Model GA Venting Systems listed to UL1777 and ULCS635 manufactured by

Flexmaster Canada Limited.

These approved vent system components are labeled for identification. DO NOT use any other manufacturer’s vent components with these appliances.

General Information

WARNING

Young children should be carefully supervised when they are in the same room as the appliance. Toddlers, young children and others may be susceptible to accidental contact burns. A physicalbarrierisrecommended 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

Lesjeunesenfantsdevraientêtre 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;cettemesureempêcherales 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.

2

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • 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 installationinstructionswillresult in an improperly installed and operating appliance, voiding its warranty. Anychangetothisappliance 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 compartimentsabritantlescommandes,lesbrûleurset 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 ETL/

Intertek (Report No. 100326540PRT-001) to ANSI Z21.88 (in Canada, CSA-2.33), and CAN/ CGA-2.17-M91 in both USA and Canada, as vented gas fireplace heaters.

Both millivolt and electronic versions of these appliances are listed by ETL/Intertek for installation in bedrooms and Manufactured Homes.

Misc. Codes/Standards

The 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 (InCanada,thecurrentCAN/CSA-B149.1 installation code).

The appliance, when installed, must be electrically 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.

These fireplaces are designed as supplemental heaters. Therefore, it is advisable to have an alternate primary heat source when installed in a dwelling.

These appliances must not be connected to a chimney or flue serving a separate solid fuel burning appliance.

Millivolt Models - The millivolt appliances are manually controlled and feature a spark igniter

(piezo) that allows the appliance's pilot gas to be lit without the use of matches or batteries. This system provides continued service in the event of a power outage.

Millivoltmodelscomestandardwithamanuallymodulated gas valve; flame appearance and heat outputcanbecontrolledatthegasvalve. The BTU Input for these appliances is shown in Table 1.

Electronic Models - These electronic appliances are manually controlled and feature an electronic intermittent pilot ignition system. External electrical power is required to operate these units.

These electronic models come standard with a manually-modulated gas valve; flame appearance and heat output can be controlled at the gas valve. The BTU Input for these appliances is shown in Table 1.

Input (BTU/HR) Manually Modulated

Gas Valves (all models)

Models

Input Rate (BTU / HR)

 

 

 

 

Nat. Gas

Prop. Gas

 

 

MLDVT-30

13,500 high

12,500 high

10,500 low

9,000 low

 

 

MLDVT-35

16,000 high

15,000 high

12,500 low

11,500 low

 

 

 

 

 

MLDVT-40

20,000 high

20,000 high

15,500 low

15,800 low

 

 

 

 

 

MLDVT-45

23,000 high

22,000 high

17,500 low

17,000 low

 

Table 1

 

 

3

 

 

 

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

Gas Pressure - All Models

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

Inlet Gas Supply Pressure

(all models)

Fuel #

 

 

Minimum

Maximum

 

 

 

 

 

Natural Gas

 

4.5" WC

10.5" WC

 

(1.12 kPa)

(2.61 kPa)

 

 

 

Propane

 

 

11.0" WC

13.0" WC

 

 

(2.74 kPa)

(3.23 kPa)

 

 

 

Table 2

 

 

 

 

 

 

 

 

 

 

 

Manifold Gas Supply Pressure

 

 

 

(all models)

 

 

 

 

 

 

 

Fuel #

 

 

Low

 

High

 

 

 

 

 

 

Natural

 

(Lo) 2.2" WC

 

(Hi) 3.5" WC

Gas

 

 

(0.55 kPa)

 

(0.87 kPa)

 

 

 

 

 

Propane

(Lo) 6.3" WC

 

(Hi) 10.0" WC

 

(1.57 kPa)

 

(2.49 kPa)

 

 

 

Table 3

Test gauge connections are provided on the front of the millivolt and electronic gas control valve (identified IN for the inlet and OUT for the manifold side). The control valves have a 3/8" (10mm) NPT thread inlet and outlet side of the valve (refer to Figures 1 and 2).

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

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

4

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

These appliances are tested and approved for installationatelevationsof0-4500feet(0-1372 meters) above sea level using the standard burnerorificesizes(markedwithan"*"inTable 4). Forelevationsabove4500feet,contactyour gas supplier or qualified service technician.

Deration - At higher elevations, the amount of BTU fuel value delivered must be reduced by either:

Using gas that has been derated by the gas company.

Changingtheburnerorificetoasmallersize 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)

Model

Nat.Gas

 

Propane

Series

drill size (inches)

 

drill size (inches)

 

 

 

 

MLDVT-30

#50 (0.070")*

 

#59 (0.041")*

H4873•

 

H7838•

 

 

 

 

 

 

MLDVT-35

(0.0748")*

 

(0.045")*

H1355•

 

75L10•

 

 

 

 

 

 

MLDVT-40

#44 (0.086")*

 

#55 (0.052")*

60J80•

 

19L52•

 

 

 

 

 

 

MLDVT-45

(0.090")*

 

#54 (0.055")*

37L70•

 

99K79•

 

 

 

 

 

Table 4

*Standard size installed at factory.

Part /Cat. Number.

 

Gas Valve Diagrams

See Figure 1 for Millivolt models and Figure 2 For Electronic Models.

Main Gas Control Knob

Pilot Adjustment

 

OFF/PILOT/ON

 

Screw

 

 

 

 

O

 

 

 

IL T

 

 

 

P

 

T

ON

 

 

 

it

 

 

H

O

WO

 

T

L

 

 

 

I

 

L

 

 

P

 

 

 

 

 

FFO

HI

 

TP

 

 

 

 

 

 

 

 

 

 

 

TPTH

IN

OUT

 

 

 

Manifold Pressure Tap

 

Inlet Pressure Tap

 

 

HI/LO Variable

 

 

 

 

Flame Height

 

 

 

 

Adjustment

Figure 1 - SIT Millivolt

Gas Valve

Supply

Pressure-Tap

Regulator

 

Burner Stage

Gas

(Manifold)

Mounting Screw

Terminal

Inlet

 

 

 

 

 

 

 

 

 

 

VENT

 

 

IN

 

 

OUT

 

 

TH

 

 

 

 

 

 

 

PILOT

 

 

HI

LO

TP

 

 

 

 

 

 

TH TP

 

 

 

IN

 

 

 

 

Pilot Gas

Pressure-Tap

Ground

Pilot Stage

 

Outlet

(Inlet)

 

(TP)

 

Terminal

Figure 2 - Dexen Electronic Gas Valve

REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS

These fireplaces are approved for installation in the US state of Massachusetts if the following additional requirements are met:

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

Installation and repair must be done by a plumber or gas fitter licensed in the Commonwealth of Massachusetts.

Theflexiblegaslineconnectorusedshallnot exceed36inches(92centimeters)inlength.

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 fireplace is installed. The carbon monoxide detector must comply with NFPA 720, be

ANSI/UL 2034 listed and be ISA certified.

A metal or plastic identification plate must be permanently mounted to the exterior of thebuildingataminimumheightofeight(8) feet above grade and be directly in line with the horizontal termination. The sign must read,inprintsizenolessthanone-half(1/2) inch in size, GAS VENT DIRECTLY BELOW.

KEEP CLEAR OF ALL OBSTRUCTIONS.

NEW YORK CITY, NEW YORK (MEA)

Installation of these fireplaces are approved for installation in New York City in the US state of New York.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

Cold Climate Insulation

For cold climate installations, seal all cracks around your appliance with noncombustible material and wherever cold air could enter the room. It is especially important to insulate outside chase cavity between studs and under floor on which appliance rests, if floor is above ground level. Gas line holes and other openings should be caulked or stuffed with unfaced fiberglass insulation.

If the fireplace is being installed on a cement slab in cold climates, a sheet of plywood or other raised platform can be placed underneath to prevent cold transfer to the fireplace and into the room. It also helps to sheetrock inside surfaces and tape for maximum air tightness and caulk firestops.

MANUFACTURED HOME

REQUIREMENTS

This appliance may be installed in an aftermarket permanently located, manufactured home and must be installed in accordance with the manufacturer's instructions and the Manufactured

Home Construction and Safety Standard, Title

24 CFR, Part 3280, in the United States, or the StandardforInstallationinMobileHomes,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 appliance is not convertible for use with other gases, unless a certified kit is used.

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

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

CAUTION: This appliance must be grounded to the chassis of the manufactured home in accordance with local codes or in the absence of local codes, with the National Electrical Code ANSI / NFPA 70 - latest edition or the Canadian Electrical Code CSA C22.1 - latest edition.

 

 

 

 

T

 

 

 

 

 

N

N

 

 

 

 

 

E

 

 

IO

 

 

 

 

V

 

T

 

 

 

P

 

A

 

 

O

 

IC

 

 

 

APPLICATION

T

 

 

L

 

 

 

 

 

 

P

 

 

 

TOP VENT

 

P

 

 

 

TOP VENT APPLICATION

A

 

 

 

 

 

 

 

 

 

 

APPLICATION

 

APPLICATION

TOP VENT

TOP VENT

 

 

 

 

 

RECESSED

 

 

 

INSTALLATION

 

 

 

 

 

 

TOP VENT

 

 

 

 

 

 

 

 

APPLICATION

 

 

HORIZONTAL VENT

(Top Vent Application)

VERTICAL VENT

(Top Vent Application)

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

Figure 3 - Typical 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.

Due to high temperatures, the appliance should be located out of traffic and away from furniture and draperies (Figure 3).

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 3).

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

These direct-vent appliances are uniquely suited for installations requiring a utility shelf positioned directly above the fireplace. Utility shelves like these are commonly used for locat-ing television sets and decorative plants.

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 (see Figure 8 on Page 8).

The minimum height from the base of the appliance to the underside of combustible materials used to construct a utility shelf in this fashion is shown in Figure 8 on Page 8.

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.

5

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • 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 according to the installation codes listed above. Also see

Figure 4.

Terminate single vent caps relative to building components according to Figure 5.

12” (305mm) Minimum

Figure 4 - Multiple Terminations

Vertical Vent Termination Clearances

TERMINATION HEIGHTS FOR VENTS ABOVE FLAT OR SLOPED ROOFS

Horizontal Overhang

 

2 FT

Vertical

2 FT MIN.

MIN.

Wall

 

 

Lowest

 

Vent

Discharge

 

Opening

 

Termination

 

 

Storm Collar

H*

 

 

X

 

 

Flashing

 

12

Roof Pitch is X/12

 

 

1 inch (25.4 mm) Minimum

 

Clearance to Combustibles

Concentric

*H = MINIMUM HEIGHT FROM ROOF TO

Vent Pipe

LOWEST DISCHARGE OPENING OF VENT

The vent / air intake termination clearances above the high side of an angled roof is as shown in the following chart:

Figure 5

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

 

 

 

Horizontal Vent Termination Clearances

The horizontal vent termination must have a minimum of 6" (152 mm) clearance to any overhead combustible projection of 2-1/2" (64 mm) or less (see Figure 6). For projections exceeding 2-1/2" (64 mm), see Figure 6. For additional vent location restrictions refer to Figure 7 on Page 7.

Horizontal Vent Termination Clearances

Combustible Projection 2-1/2 inches or less in length

Combustible Projection greater than 2-1/2 inches in length

Ventilated

Soffit Unventilated

Soffit

 

 

6"

18"

12"

(152 mm)

(457 mm)

(305 mm)

 

Side Elevation View

Termination Kit

All horizontal terminations may be located as close as 6” (152mm) to any (non-combustible and

combustible) exterior sidewall. This distance

may be decreased to 2” (51mm) for noncombustible exterior sidewalls only, if the SV4.5HT-2 termination is used.

Termination Kit

Figure 6

Note - See Figure 30 on Page 19 for the exterior wall recess

allowances of the square horizontal termination.

6

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

Exterior HORIZONTAL Vent TERMINATION Clearance Requirements

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: Local Codes Or Regulations

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* See Item D in the Text Below.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

May Require Different Clearances.

 

 

 

 

 

 

 

 

 

 

P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: Location Of The Vent Termination

N

 

N

 

 

 

Exterior Wall

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Inside

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corner Detail

 

 

 

 

 

Must Not Interfere With Access To The

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electrical Service.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*18”

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Horizontal

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Termination

 

 

6”

 

Ventilated Soffit

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Inside Corner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

= 9” in U.S.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Detail D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

= 12” in Canada

 

 

 

 

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

Fixed

 

 

 

 

 

 

V

 

 

Operable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Closed

 

 

 

 

 

 

 

 

 

Window

 

 

 

 

 

 

 

 

 

 

 

3 ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Window

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

B

 

 

 

 

 

 

 

 

 

 

 

 

J

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

C

 

 

 

 

 

B

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X = Air Supply Inlet

 

= Vent Termination

 

 

= Area where Termination is not Permitted

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Canadian Installation*

 

 

US Installation**

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A = Clearance above grade, veranda, porch, deck, or balcony.

12 inches (30cm)*

 

 

 

 

 

 

 

 

12 inches (30cm)**

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B = Clearance to window or door that may be opened.

 

 

 

 

 

 

6 inches (15cm) for appliances

6 inches (15cm) for appliances

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

< 10,000 Btuh (3kW), 12 inches (30cm)

< 10,000 Btuh (3kW), 9 inches (23cm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for appliances > 10,000 Btuh (3kW)

for appliances > 10,000 Btuh (3kW) and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

< 50,000 Btuh (15kW), 12 inches (30cm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for appliances > 50,000 Btuh (15kW)**

 

 

 

 

 

 

 

 

 

 

 

C = Clearance to permanently closed window

 

 

 

 

 

 

 

 

12 inches (305mm) recommended to

9 inches (229mm) recommended to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

prevent window condensation

prevent window condensation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D = Vertical clearance to ventilated soffit located above the

 

18 inches (458mm)

 

 

 

 

 

 

 

 

18 inches (458mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

termination within a horizontal distance of 18 inches (458mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E = Clearance to unventilated soffit

 

 

 

 

 

 

 

 

 

 

 

 

12 inches (305mm)

 

 

 

 

 

 

 

 

12 inches (305mm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F = Clearance to outside corner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5 inches (12.7cm) minimum

5 inches (12.7cm) minimum

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G = Clearance to inside corner

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 inches (5.08cm) minimum - SV4.5HT-2•

2 inches (5.08cm) minimum - SV4.5HT-2•

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6 inches (15.2cm) minimum - SV4.5HTSS

6 inches (15.2cm) minimum - SV4.5HTSS

H = Clearance to each inside of center line extended above

 

3 feet (91cm) within a height of 15 feet

3 feet (91cm) within a height of 15 feet

meter/regulator assembly

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

above the meter/regulator assembly*

above the meter/regulator assembly**

I = Clearance to service regulator vent outlet

 

 

 

 

 

 

 

 

3 feet (91cm)*

 

 

 

 

 

 

 

 

 

 

3 feet (91cm)**

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J = Clearance to nonmechanical air supply inlet to building or

6 inches (15cm) for appliances

6 inches (15cm) for appliances

 

 

 

 

 

 

the combustion air inlet to any other appliance

 

 

 

 

 

 

 

 

< 10,000 Btuh (3kW), 12 inches (30cm)

< 10,000 Btuh (3kW), 9 inches (23cm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for appliances > 10,000 Btuh (3kW)

for appliances > 10,000 Btuh (3kW) and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

< 50,000 Btuh (15kW), 12 inches (30cm)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for appliances > 50,000 Btuh (15kW)**

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K = Clearance to a mechanical air supply inlet

 

 

 

 

 

 

 

 

6 feet (1.83m)*

 

 

 

 

 

 

 

 

 

 

3 feet (91cm) above if within 10 feet (3m)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

horizontally**

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L = Clearance above paved sidewalk or paved diveway located

7 feet (2.13m)‡

 

 

 

 

 

 

 

 

 

 

7 feet (2.13m)‡

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

on public property

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M = Clearance under veranda, porch, deck or balcony

 

 

 

 

 

 

12 inches (30cm)*‡

 

 

 

 

 

 

 

 

12 inches (30cm)‡

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N = Depth of Alcove (Maximum)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6 feet (1.83m)*

 

 

 

 

 

 

 

 

 

 

6 feet (1.83m)**

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O = Clearance to Termination (Alcove)

 

 

 

 

 

 

 

 

6 inches (15.2mm)*

 

 

 

 

 

 

 

 

6 inches (15.2mm)**

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P = Width of Alcove (Minimum)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 feet (91cm)*

 

 

 

 

 

 

 

 

 

 

3 feet (91cm)*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q = Clearance to Combustible Above (Alcove)

 

 

 

 

 

 

 

 

18 inches (457mm)*

 

 

 

 

 

 

 

 

18 inches (457mm)**

 

 

 

 

 

 

 

 

 

 

 

 

 

* In accordance with the current CSA-B149.1 National Gas And Propane Installation Code. ** In accordance with the curent ANSI SZ223.1/NFPA 54 National Fuel Gas Codes.

‡ A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves both dwellings.

*‡ Only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the floor.

•2 inch Clearance to Non-Combustibles for SV4.5HT-2 Only.

Figure 7

7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

MINIMUM CLEARANCES TO COMBUSTIBLES

Appliance And Vent Clearances

The appliance is approved with zero clearance to combustible materials on all sides (as detailed in Table 5), with the following exception: When the unit is installed with one side flush with a wall, the wall on the other side of the unit must not extend beyond the front edge of the unit. In addition, when the unit is recessed, the side walls surrounding the unit must not extend beyond the front edge of the unit (see Figure 3).

MINIMUM CLEARANCES* Inches (millimeters)

Back

0 (0) Spacers Or Dimples

 

 

Sides

0 (0) Spacers Or Dimples **

Top Spacers

0 (0) Spacers Or Dimples

 

 

Floor

0 (0)

 

 

From Bottom of Unit To Ceiling

64 (1626)

 

 

Vent

3 (76) Top* / 1 (25.4) Sides & Bottom

SERVICE CLEARANCES Feet (meters)

 

 

Front

3 feet (0.9 meters)

 

 

Table 5

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

**Note: See Step 1 on Page 9 for clearance requirements to the nailing flanges on each side of the unit and any adjacent screw heads.

Hearth Extension - A hearth extension is not required with this appliance. If a hearth extension is used, do not block the lower control compartment door. Any hearth extension used is for appearance only and does not have to conform to standard hearth extension installation requirements.

Shelf Height - To provide for the lowest possible shelf surface, the venting attached to the top vent 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). The minimum height from the base of the appliance to the underside of combustible materials used to construct a utility shelf in this fashion is shown in 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 face (black sheet metal). Never allow combustible materials to be positioned in front of or overlapping the appliance face (see Figure 53 on Page 33).

Non-combustible materials, such as surrounds and other appliance trim, may be installed on the appliance 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 noncombustible materials may be installed at any height above the appliance opening; however, do not allow anything to hang below the fireplace hood.

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

8

Model No.

Combustible Shelf Height - Inches (millimeters)

 

 

Top Vent - with One 90 Degree Elbow

 

 

 

 

 

Secure Vent

Secure Flex (flex elbow)

 

 

 

MLDVT-30/35

*46-1/2 (1181)

*48-1/4 (1226)

 

 

 

MLDVT-40/45

*51-1/2 (1308)

*53-1/4 (1349)

 

 

 

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

*Shelf Height

(see table)

* Includes 3" clearance to combustibles (required above vent components)

Figure 8 - Shelf Height Minimum Clearances With Top Venting

 

 

Mantel Depth

 

 

18 (457)

 

 

 

 

 

inches (millimeters)

 

 

 

 

 

 

16 (406)

 

 

 

 

 

 

14 (356)

 

 

 

 

 

 

12 (305)

 

 

 

 

 

Header

 

 

 

 

 

 

Top of

10 (254)

 

 

 

 

 

Appliance

8 (203)

 

 

 

 

 

 

 

 

 

 

 

 

Note - Hood shown

12

10

8

6

4

2

as positioned.

(305)

(254)

(203)

(152)

(102)

(51)

 

Figure 9 - Minimum Mantel Clearances

At 14" minimum

At 8-1/4" side

 

 

 

 

 

side wall clearance,

wall clearance, a

Top View of

 

 

 

a combustible wall

combustible wall

 

 

 

Fireplace

 

 

 

can project to any

can project 12"

 

 

 

length.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Combustible Materials

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Allowed In Shaded Area

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45o

 

 

 

 

 

5 (127)

“Safe Zone”

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Combustible Walls

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

shown in dark gray

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Combustiblematerialsmay

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12 (305)

project

beyond

one side

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of the

fireplace

opening

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

as long as they are kept

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

within

the

shaded areas

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

illustrated

here.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

19 (483)

Inches (millimeters)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1/4 Protected wall shown in white

 

 

 

14

 

 

 

 

8-

 

 

 

(356)(209)

Figure 10 - Minimum Distance to Unprotected Side Wall

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

WARNING

Failure to position the parts in accordance with these diagrams or failure to use only parts specificallyapprovedwiththisappliance 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 approuvéesaveccetappareilsont utilisées.

PRE-Installation Steps

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

1.Remove the shipping carton. Remove the shipping pad, exposing the front glass door.

2.Open the two latches (located under the firebox floor) securing the glass door. Remove the door by tilting it outward at the bottom and lifting it up. Set the door aside protecting it from inadvertent damage. See Removing Glass Panels on Page 31.

TYPICAL INSTALLATION SEQUENCE

The typical sequence of installation is outlined below; however, each installation is unique and may result in variations to the steps described.

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

Step 1. (Page 9) Construct the appliance framing. Position the appliance within the framing and secure with nailing brackets.

Bend up the appropriate header spacing guides for the drywall/finish material thickness to be used (see Figure 49). Bend up the outer pair for 1/2" materials and the inner pair for 5/8" materials.

Bend out the appropriate nailing flanges for the drywall/finish material to be used. Nailing flanges are provided for flush framing, 1/2-inch, and 5/8- inch framing depths (see Figure 12).

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

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

Step 4. (Page 24) Field Wiring

a.Millivolt Appliances – Install the operating control switch (not factory provided) and bring in electrical service line for forced air-circulating blower (optional equipment).

b.Electronic Appliances – Field wire and install operating control switch.

Step 5. (Page 25) Install blower kit (optional equipment).

Step 6. (Page 26) Make connection to gas supply.

Step 7. (Page 27) Verify appliance operation.

Step 8. (Page 28) Install the logs, decorative volcanic stone and glowing embers.

Step 9. (Page 31) Install glass door assembly.

Step 10. (Page 31) Adjust burner primary air shutter to achieve proper flame appearance.

Step 11. (Page 33) Install the hood.

Step12.(Page 34) Attach Safety-in-Operation

Warnings.

Detailed Installation Steps Step 1. Framing

Frame these appliances as illustrated in Figures 13 and 14 on Pages 10 and 11. (Figure 14 applies to corner framing installations only.)

All framing details must allow for a minimum clearance to combustible framing members as shown in Table 5 on Page 8.

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

Headers may be in direct contact with the appliance top spacers when they are bent up vertically maintainingthe3"clearancetothefireplacetop, but must not be supported by them or notched to fit around them. All construction above the appliance must be self-supporting. DO NOT use the appliance for structural support.

The fireplace should be secured to the side framing members using the unit’s nailing flanges — one top and bottom on each side of the fireplace front (see Figure 12). Use 8d nails or their equivalent.

Unit

Nailing Flange

Side

Framing

Nailing Flanges Are

Provided At All Four

Corners At 5/8”, 1/2”

And Flush Settings

Unit Being Secured by its Nailing

Flanges to the Framing

Left Side Front Corner of Fireplace Shown (Right side requirements are the same.)

NOTE: The nailing flanges, combustible members and screw heads located in areas directly adjacent to the nailing flanges, are EXEMPT from the 1/2” clearance to combustible requirements for the firebox outer wrapper.

Combustible framing may be in direct contact with the nailing flanges and may be located closer than 1/2” from screw heads and the firebox wrapper in areas adjacent to the nailing flanges.

Frame the opening to the exact dimensions specified in the framing details of this manual.

Figure 12 - Nailing Flanges

9

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Lennox MLDVT-40PM, MLDVT-35NM, MLDVT-30NM, MLDVT-45NE, MLDVT-30PM User Manual

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

FIREPLACE AND FRAMING SPECIFICATIONS

 

 

 

 

 

 

Framing

 

 

 

 

 

 

 

 

 

 

 

 

Framing should be

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vent Framing - Top Vent

 

 

 

 

constructed of 2x4 or

 

 

 

 

 

Framing Dimensions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10-1/2

 

larger lumber.

 

Model No.

 

 

 

 

A

 

B

 

C

D

 

With One 90° Elbow

 

 

 

(267)

 

 

 

 

MLDVT-30

 

in.

 

30-1/4

35-1/4

 

39-1/4

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mm

 

768

 

895

 

997

406

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MLDVT-35

 

in.

 

35-1/4

35-1/4

 

39-1/4

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

mm

 

895

 

895

 

997

406

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5-1/8

(178)

 

 

 

 

in.

 

40-1/4

40-1/4

 

44-1/4

16

 

 

 

 

 

 

 

 

 

 

MLDVT-40

 

 

 

 

 

 

 

 

 

(130)

 

12-1/8

 

 

mm

 

1022

 

1022

 

1124

406

 

 

 

 

 

 

 

 

 

 

(308)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MLDVT-45

 

in.

 

45-1/4

40-1/4

 

44-1/4

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mm

 

1149

 

1022

 

1124

406

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Efficiencies (%)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

Model

 

 

 

Natural Gas

 

Propane

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AFUE

EnerGuide (P4)

AFUE

EnerGuide (P4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MLDVT-30

 

 

57

 

 

55.6

 

58

56.1

 

 

 

 

 

 

 

 

 

 

 

 

MLDVT-35

 

 

57.5

 

 

55.6

 

59.0

58.1

 

 

 

 

 

 

 

 

 

 

 

 

MLDVT-40

 

 

62

 

 

61

 

62.3

59.5

 

 

 

 

 

D

 

 

 

 

MLDVT-45

 

 

63

 

 

60

 

64

62

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1/2 A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vent Size

 

 

 

 

 

Input (BTU/HR) - MV & Electronic

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Natural & Propane Gas

 

 

 

 

 

 

 

 

 

Coaxial DV

 

4-1/2" Inner

 

 

 

 

Inches (millimeters)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vent Size

 

7-1/2" Outer

 

 

Models

Input Rate (BTU / HR)

Dimension D is the required framing depth when the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MLDVT-30N

13,500

 

 

 

finish material (drywall) thickness is 1/2 in. (13mm)

 

MLDVT-30P

12,500

 

 

 

 

 

 

 

 

 

 

MLDVT-35N

16,000

Vertical Venting Through the Ceiling:

 

 

MLDVT-35P

15,000

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

 

MLDVT-40N

20,000

locate center of the vertical run. Cut and/or frame an opening, 10-1/2" x 10-1/2" (267

 

MLDVT-40P

20,000

mm x 267 mm) inside dimensions, about this center mark (see Figure 18).

 

MLDVT-45N

23,000

 

 

 

 

 

Notes

MLDVT-45P

22,000

 

 

 

NOTE: It is recommended that the gas be stubbed in from the left

Diagrams, illustrations and photo-

 

 

 

 

side only.

NOTE - Eyebrow

 

 

 

 

ELECTRICAL INLET

graphs are not to scale – consult

 

 

 

 

hood shown.

installation instructions. Product

 

 

 

 

KNOCKOUT - 2-3/4 X 2

 

designs, materials,

dimensions,

 

J

 

 

(70 X 51) COVER PLATE

 

specifications, colors and prices are

 

 

 

(With KNOCKOUT -

16 (406)

subject to change or discontinuance

 

 

 

 

Right Side Only)

 

without notice.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K

 

 

 

 

GAS INLET

 

L

 

 

 

 

 

KNOCKOUT

5-7/8

*CONCENTRIC FLUE

 

 

 

(Other Side)

 

 

 

(149)

 

FLUE - 4-1/2 (114)

E

 

G

 

 

 

 

 

OPTIONAL

9-1/2

 

COMBUSTION AIR

 

 

F

 

 

 

 

 

- 7-1/2 (190)

 

H

 

ELECTRICAL

(241)

 

 

 

 

 

 

 

 

 

 

INLET KNOCKOUT,

 

1/2

 

 

 

 

 

REQUIRING A FIELD

1-5/8 (42)

 

 

 

 

 

PROVIDED

 

(13)

9-1/4 (235)

 

 

 

 

3 (76)

 

 

 

 

JUNCTION BOX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Either Side)

 

Top View

 

M

 

 

 

 

 

Front View

 

 

3 (76)

Right Side View

 

 

Model No.

 

E

F

 

G

H

J

K

L

M

 

 

 

 

 

MLDVT-30

in.

32-1/4

28-1/8

 

23-1/4

27

30-1/4

20

10

28

 

Viewable Glass Size

 

 

 

mm

819

715

 

587

686

768

508

354

711

 

30" Model

24-1/4" Wide

 

 

 

 

 

 

 

 

 

 

in.

32-1/4

28-1/8

 

23-1/4

32

35-1/4

25

12-1/2

33

 

 

20-1/4" High

 

 

 

MLDVT-35

 

 

35" Model

29-1/4" Wide

 

 

 

mm

819

715

 

587

813

892

635

317

838

 

 

 

 

 

 

 

20-1/4" High

 

 

 

 

in.

37-1/4

33-1/8

 

28-1/4

37

40-1/4

30

15

38

 

 

 

 

 

 

MLDVT-40

 

 

40" Model

34-1/4" Wide

 

 

 

mm

946

841

 

714

940

1019

762

381

965

 

25-1/4" High

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45" Model

39-1/4" Wide

 

 

 

 

in.

37-1/4

33-1/8

 

28-1/4

42

45-1/4

35

17-1/2

43

 

 

 

 

MLDVT-45

 

 

25-1/4" High

 

10

Figure 13

mm

946

841

 

714

1067

1149

889

445

1092

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

 

 

 

 

 

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

fireplace FRAMING specifications

Model No.

 

A

B

C

D

E

 

 

MLDVT-30

in.

30 1/4

53 3/16

37 29/32 26 13/16

12 1/4

 

E

mm

768

1350

963

681

311

 

 

 

 

7 (178)

 

in.

35 1/4

57 1/2

40 5/8

28 3/4

13 3/4

 

MLDVT-35

 

 

mm

895

1461

1032

730

349

 

 

 

 

 

MLDVT-40

in.

40 1/4

61 13/16

43 11/32 30 11/16

15 1/8

C

 

mm

1022

1554

1101

779

384

D

 

 

MLDVT-45

in.

45 1/4

66 1/8

46 1/16

32 5/8

16 1/2

 

 

mm

1149

1680

1170

829

419

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

Back wall of chase/enclosure

Inches

 

 

 

 

 

 

 

(including any finishing materials)

(millimeters)

Figure 14 - Corner Framing with Horizontal Termination

 

 

 

Step 2. Routing Gas Line

Route a 1/2" (13 mm) gas line to the left side of the appliance as shown in Figure 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 flexible gas line connector and 1/2 inch shutoff valve (see Step 6 on Page 26).

Left Side Front

Corner of Fireplace

Framing

Pipe Coupling (Recommended)

6-1/2" (152 mm)

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. We recommend that a qualified individual such as a plumber or gas fitter be hired to correctly size and route the gas supply line to the appliance. Installing a gas supply line from the fuel supply to the appliance involves numerous considerations of materials, protection, sizing, locations, controls, pressure, sediment, and more. Certainly no one unfamiliar and unqualified should attempt sizing or installing gas piping.

Schedule 40

Black Iron Pipe

Inside Diameter (Inches)

Schedule 40 Pipe

Natural

Propane

Length (feet)

Gas

Gas

Notes:

All appliances are factory-equipped with a flexible gas line connector and 1/2 inch shutoff valve (see Figure 40 on Page 26).

SeeMassachusetts Requirements on Page 4 for additional requirements for installations in the state of Massachusetts in the USA.

The gas supply line should Not be connected to the appliance until Step 6 (Page 26).

Apipejointcompoundratedforgasshouldbe used on the threaded joints. Ensure propane resistant compounds are used in propane applications. Be very careful that the pipe compound does not get inside the pipe.

It is recommended to install a sediment trap in the supply line as close as possible to the appliance. Appliances using propane should have a sediment trap at the base of the tank.

Checkwithlocalbuildingofficialforlocalcode requirements(i.e.arebelowgradepenetrations of the gas line allowed?, etc).

3" (76 mm)

Also see Figure 13.

Figure 15 - Route Gas Line

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).

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

Table 6

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

11

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS

Step 3. Install the Vent System

General Information

These instructions should be used as a guideline and do not supersede local codes in any way. Install venting according to local codes, these instructions, the current National Fuel Gas Code (ANSI-Z223.1) in the USA or the current standards of CAN/CSA-B149.1 in Canada.

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

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

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

These fireplaces must be vented directly to the outside.

The vent system may not service multiple appliances, and must never be connected to a flue serving a solid fuel burning appliance. The vent pipe is tested to be run inside an enclosed wall(suchasachase).Thereisnorequirement for inspection openings in the enclosing wall at any of the joints in the vent pipe.

Installation of Vent Restrictor

A vent restrictor may be needed with this appliance. The restrictor is installed in the appliance top flue outlet as shown in Figure 16, either before adding vent, from above, or after installation of vent from below, within the firebox. The restrictor is self securing through a positive friction fit.

Determine the venting for the appliance. If the vent run will include at least 8 feet of vertical rise, then install the restrictor in the appliance collar before connecting any vent (Refer to

Figure 16). Place the restrictor inside the appliance vent collar and press in place.

Note: The restrictor is included within the firebox.

Vent Restrictor Installation

(Top Vent)

A vent restrictor may be needed when vertically terminating the vent system above the roof (when using the appliance top vent), install vent restrictor in the top vent of the fireplace outlet on all MLDVT series models. If needed,

install the restrictor orientated as shown, either from inside or outside the unit,in the inner fireplace collar.

Restrictor

Inner

Fireplace

Collar Appliance Top

Vent Outlet

Figure 16

Select Venting System - Horizontal or Vertical

Withtheappliancesecuredinframing,determine vent routing and identify the exterior termination location. The following sections describe vertical (roof) and horizontal (exterior wall) vent applications. Refer to the section relating to your installation. A list of approved venting components are shown on Pages 35 and 36.

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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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