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

...

INSTALLATION INSTRUCTIONS

AVERTISSEMENT : Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au minimum le risque d’incindie ou d’explosion ou pour éviter tout dommage matériel, toute blessure ou la mort.

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

WARNING /AVERTISSEMENT/AVISO

• HOT GLASS WILL CAUSE BURNS.

• DO NOT TOUCH GLASS UNTIL COOLED.

• NEVER ALLOW CHILDREN TO TOUCH GLASS.

• UNE SURFACE VITRÉE CHAUDE PEUT CAUSER DES BRÛLURES.

• LAISSER REFROIDIR LA SURFACE VITRÉE AVANT D'Y TOUCHER.

• NE PERMETTEZ JAMAIS À UN ENFANT DE TOUCHER LA SURFACE VITRÉE.

• EL VIDRIO CALIENTE CAUSARÁ QUEMADURAS.

• USTED DEBE NUNCA TOCAR EL VIDRIO CALIENTE.

• LOS NIÑOS DEBEN NUNCA TOCAR EL VIDRIO.

- Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other appliance.

- WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any

phone in your building.

• Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s instructions.

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

department.

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

- Ne pas entreposer ni utilizer d’essence ni d’autres vapeurs ou liquides inﬂammables dans le voisinage de cet appareil ou de tout autre appareil.

- QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :

• Ne pas tenter d’allumer d’appareil.

• Ne touchez à aucan interrupteur. Ne pas vous servir des

téléphones se trouvant dans le bâtiment où vous trouvez.

• Appelez immédiatement votre fournisseur de gaz depuis

un voisin. Suivez les instructions du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de gaz,

appelez le service des incindies.

- L’installation et l’entretien doivent être assurés par un installateur ou un service d’entretien qualiﬁé ou par le fournisseur de gaz.

MLDVT Direct-Vent Gas Fireplaces

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.

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.

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.

MODELS

MILLIVOLT:

MLDVT-30NM MLDVT-30PM MLDVT-35NM MLDVT-35PM

Report No. 100326540PRT-001

MLDVT-40NM MLDVT-40PM MLDVT-45NM MLDVT-45PM

™

ELECTRONIC:

MLDVT-30NE MLDVT-35NE MLDVT-40NE MLDVT-45NE

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 pack-

age 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 Compo-

nents 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 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 • 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 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 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 (In Canada, the current CAN/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.

Millivolt 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.

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

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

Input Rate (BTU / HR)

Nat. Gas Prop. Gas

13,500 high

10,500 low

16,000 high

12,500 low

20,000 high

15,500 low

23,000 high

17,500 low

12,500 high

9,000 low

15,000 high

11,500 low

20,000 high

15,800 low

22,000 high

17,000 low

Table 1

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

Propane

4.5" WC

(1.12 kPa)

11.0" WC

(2.74 kPa)

10.5" WC

(2.61 kPa)

13.0" WC

(3.23 kPa)

Table 2

Manifold Gas Supply Pressure

(all models)

Fuel # Low High

Natural

Gas

Propane

(Lo) 2.2" WC

(0.55 kPa)

(Lo) 6.3" WC

(1.57 kPa)

(Hi) 3.5" WC

(0.87 kPa)

(Hi) 10.0" WC

(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

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 "*" in Table

4). For elevations above 4500 feet, contact your

gas supplier or qualiﬁed service technician.

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

• Using gas that has been derated by the gas

company.

• Changing the burner orice to a smaller size

as regulated by the local authorities having

jurisdiction and by the (USA) National Fuel Gas Code NFPA 54/ANSI Z223.1 - latest edition or, in Canada, the CAN/CSA-B149.1

codes - latest edition.

Install the appliance according to the regulations of the local authorities having jurisdiction and, in the USA, the National Fuel Gas Code NFPA

54 / ANSI Z223.1 - latest edition 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

Series

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

Nat.Gas

drill size (inches)

#50 (0.070")*

•

H4873

(0.0748")*

•

H1355

#44 (0.086")*

•

60J80

(0.090")*

•

37L70

Propane

drill size (inches)

#59 (0.041")*

•

H7838

(0.045")*

•

75L10

#55 (0.052")*

•

19L52

#54 (0.055")*

•

99K79

*Standard size installed at factory. Table 4

Gas Valve Diagrams

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

Main Gas Control Knob

•

Part /Cat. Number.

OFF/PILOT/ON

t i

Pilot Adjustment

Screw

H T P T H T P T

Supply Gas Inlet

Pressure-Tap (Manifold)

PILOT

Pilot Gas Outlet

Regulator Mounting Screw

Pressure-Tap (Inlet)

Burner Stage

Terminal

VENT

OUT

Ground (TP)

Pilot Stage 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 Com-

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

ANSI/UL 2034 listed and be ISA certied.

• A metal or plastic identication plate must

be permanently mounted to the exterior of

the building at a minimum height of eight (8)

feet above grade and be directly in line with the horizontal termination. The sign must

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

KEEP CLEAR OF ALL OBSTRUCTIONS.

NEW YORK CITY, NEW YORK (MEA)

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

OUT

Manifold Pressure Tap

Inlet Pressure Tap

HI/LO Variable Flame Height Adjustment

Figure 1 - SIT Millivolt Gas Valve

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 manu-

facturer'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 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.

TNEVPOT

NOITACILPPA

TNEVPOT

NOITACILPPA

TNEVPOT

APPLICATION

TOP VENT

RECESSED

INSTALLATION

HORIZONTAL VENT

(Top Vent Application)

NOITACILPPA

TNEVPOT

TOP VENT

APPLICATION

VERTICAL VENT

(Top Vent Application)

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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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.

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.

Roof Pitch is X/12

2 FT MIN.

Lowest

Discharge

Opening

*H = MINIMUM HEIGHT FROM ROOF TO

LOWEST DISCHARGE OPENING OF VENT

TERMINATION HEIGHTS FOR VENTS ABOVE

FLAT OR SLOPED ROOFS

Horizontal Overhang

Vertical Wall

Vent

Termination

Storm Collar

Concentric

Vent Pipe

Flashing

1 inch (25.4 mm) Minimum Clearance to Combustibles

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

Vertical Vent Termination Clearances

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

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

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 5

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.

Figure 4 - Multiple Terminations

Horizontal Vent Termination Clearances

Combustible Projection

inches or less in length

2-1/2

Combustible Projection greater

than 2-1/2 inches in length

Ventilated

Soffit

Unventilated

Soffit

18"

(457 mm)

12"

(305 mm)

(152 mm)

Side Elevation View

Termination Kit

Figure 6

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 non-combustible exterior sidewalls only, if the SV4.5HT-2 termination is used.

Termination Kit

Note - See Figure 30 on Page 19 for the exterior wall recess allowances of the square horizontal termination.

NOTE: Local Codes Or Regulations

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

EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS

* See Item D in the Text Below.

Exterior Wall

*18”

Horizontal Termination

Inside Corner

6”

Detail D

Ventilated Soffit

Fixed

Closed

Window

= Air Supply Inlet

Inside

Corner Detail

Operable

Window

= Vent Termination

= Area where Termination is not Permitted

May Require Different Clearances.

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

= 9” in U.S.



= 12” in Canada

3 ft.



3 ft.

Figure 7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.



5 (127)

8-1/4

(209)

(356)

12 (305)

(483)

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.

Model No.

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)

(

Figure 8 -

Shelf Height Minimum Clearances With Top Venting

Top Vent - with One 90 Degree Elbow

Secure Vent Secure Flex (ﬂex elbow)

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

Mantel Depth

Combustible Shelf Height - Inches (millimeters)

18 (457)

inches (millimeters)

16 (406)

**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 non- combustible 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

14 (356)

12 (305)

Header

Top of

10 (254)

8 (203)

Appliance

Note - Hood shown

(305)

(254)

(203)

(152)

(102)

(51)

as positioned.

Figure 9 - Minimum Mantel Clearances

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

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

Protected wall shown in white

Top View of

Fireplace

Combustible Materials Allowed In Shaded Area “Safe Zone”

Combustible Walls shown in dark gray

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

Inches (millimeters)

Figure 10 - Minimum Distance to Unprotected Side Wall

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 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.

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.

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 spac-

ing 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 5/8inch 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.

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

maintaining the 3" clearance to the replace top,

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

2. Open the two latches (located under the rebox oor) 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.

Step 4. (Page 24) Field Wiring a. Millivolt Appliances – Install the

operating control switch (not fac-

tory 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. Step 12. (Page 34) Attach Safety-in-Operation

Warnings.

Side

Framing

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.

Nailing Flanges Are Provided At All Four Corners At 5/8”, 1/2” And Flush Settings

Figure 12 - Nailing Flanges

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 AND FRAMING SPECIFICATIONS

Framing

Framing Dimensions

Model No. A B C D

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

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 MLDVT-45 63 60 64 62

Coaxial DV

Vent Size

Diagrams, illustrations and photographs are not to scale – consult install ation instructions. Product design s, mat erials, dim ension s, speciﬁcations, colors and prices are subject to change or discontinuance without notice.

in. 30-1/4 35-1/4 39-1/4 16

mm 768 895 997 406

in. 35-1/4 35-1/4 39-1/4 16

mm 895 895 997 406

in. 40-1/4 40-1/4 44-1/4 16

mm 1022 1022 1124 406

in. 45-1/4 40-1/4 44-1/4 16

mm 1149 1022 1124 406

Efﬁciencies (%)

Model

Natural Gas Propane

AFUE EnerGuide (P4) AFUE EnerGuide (P4)

Vent Size

4-1/2" Inner

7-1/2" Outer

Notes

Input (BTU/HR) - MV & Electronic

Natural & Propane Gas

Models Input Rate (BTU / HR)

MLDVT-30N 13,500 MLDVT-30P 12,500 MLDVT-35N 16,000 MLDVT-35P 15,000 MLDVT-40N 20,000 MLDVT-40P 20,000 MLDVT-45N 23,000 MLDVT-45P 22,000

1/2 (13)

*CONCENTRIC FLUE

FLUE - 4-1/2 (114) COMBUSTION AIR

- 7-1/2 (190)

9-1/4 (235)

Top View

Framing should be

Vent Framing - Top Vent With One 90° Elbow

10-1/2

(

5-1/8 (130)

constructed of 2x4 or larger lumber.

)

267

(178)

12-1/8

(308)

1/2

Inches (millimeters)

Dimension D is the required framing depth when the ﬁnish material (drywall) thickness is 1/2 in. (13mm)

Vertical Venting Through the Ceiling: Frame ceiling opening - Use a plumb line from the ceiling above the appliance to

locate center of the vertical run. Cut and/or frame an opening, 10-1/2" x 10-1/2" (267 mm x 267 mm) inside dimensions, about this center mark (see Figure 18).

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

ELECTRICAL INLET KNOCKOUT - 2-3/4 X 2

(70 X 51) COVER PLATE (With KNOCKOUT Right Side Only)

GAS INLET

KNOCKOUT

(Other Side)

INLET KNOCKOUT,

REQUIRING A FIELD

JUNCTION BOX

OPTIONAL

ELECTRICAL

PROVIDED

(Either Side)

Front View

3 (76)

NOTE - Eyebrow hood shown.

16 (406)

5-7/8 (149)

Right Side View

9-1/2 (241)

1-5/8

(42)

3 (76)

Figure 13

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

.oNledoM E F G H

32-1/4

28-1/8

.ni

819

32-1/4

.ni

819

37-1/4

.ni

946

37-1/4

.ni

946

23-1/4

715

587

686

28-1/8

23-1/4

58732813

715

28-1/4

33-1/8

71437940

841

33-1/8

28-1/4

841

714421067

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

30-1/4

76820508

35-1/4

89225635

40-1/4

101930762

45-1/4

114935889

L M

354

12-1/2

31733838

38138965

17-1/2

445

711

1092

Viewable Glass Size

30" Model

35" Model

40" Model

45" Model

24-1/4" Wide 20-1/4" High

29-1/4" Wide 20-1/4" High

34-1/4" Wide 25-1/4" High

39-1/4" Wide 25-1/4" High

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

FIREPLACE FRAMING SPECIFICATIONS

37 29/32

963

40 5/8

1032

43 11/32

1101

46 1/16

1170

26 13/16

28 3/4

30 11/16

32 5/8

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

.oNledoM A B D E

30 1/4

in.

35 1/4

40 1/4

768

895

1022

45 1/4

1149

53 3/16

1350

57 1/2

1461

61 13/16

1554

66 1/8

1680

Figure 14 - Corner Framing with Horizontal Termination

Step 2. ROUTING GAS LINE

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

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).

ply line, if black iron pipe is being used. Gas lines must be routed, constructed and made of materials that are in strict accordance with

local codes and regulations. We recommend

that a 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,

(76 mm)

Left Side Front

Corner of Fireplace

Framing

Pipe Coupling

(Recommended)

6-1/2"

(152 mm)

pressure, sediment, and more. Certainly no one unfamiliar and unqualiﬁed should attempt sizing or installing gas piping.

Schedule 40 Pipe

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).

Table 6

12 1/4

681

311

13 3/4

730

349

15 1/8

779

384

16 1/2

829

419

Back wall of chase/enclosure

(including any finishing materials)

Schedule 40

Black Iron Pipe

Inside Diameter (Inches)

Natural

Length (feet)

Gas

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

Propane

Gas

7 (178)

Inches

(millimeters)

Notes:

• All appliances are factory-equipped with a

ﬂexible gas line connector and 1/2 inch shutoff valve (see Figure 40 on Page 26).

• See Massachusetts Requirements on Page 4

for additional requirements for installations in

the state of Massachusetts in the USA.

• The gas supply line should Not be connected

to the appliance until Step 6 (Page 26).

• A pipe joint compound rated for gas should be

used on the threaded joints. Ensure propane resistant compounds are used in propane applications. Be very careful that the pipe

compound does not get inside the pipe.

• It is recommended to install a sediment trap

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

• Check with local building ofcial for local code

requirements (i.e. are below grade penetrations

of the gas line allowed?, etc).

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

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

Dé gagement conforme a ux 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 (such as a chase). There is no requirement

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 ap- pliance 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

Restrictor

Inner Fireplace Collar

inner ﬁreplace collar.

Appliance Top

Vent Outlet

Figure 16

Select Venting System - Horizontal or Vertical

With the appliance secured in framing, 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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5.112 526.71 1 0 0 6 0 7

5.712 521.81 0 1 0 6 0 7

5.922 521.91 0 0 1 6 0 7

5.23

2 573.91 0 0 0 0 5 5

5.142 521.02 0 0 0 7 0 7

642 5.02 1 0 0 7 0 8

252 12 0 1 0 7 0 8

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5.982 521.42 0 1 0 0 6 7

5.103 521.52 0 0 1 0 6 7

5.013 578.52 0 0 0 9 0 9

5.523 521.72 0 0 0 0 7 7

033 5.72 1 0 0 0 7 8

543 57.82 0 0 0 01 0 01

5.943 521.92 1 0 0 01 0 11

273 13 0 0 0 0 8 8

5.973 526.13 0 0 0 11 0 11

5.814 578.43 0 0 0 0 9 9

564 57.83 0 0 0 0 01 01

5.574 526.93 0 1 0 0 01 11

084 04 1 1 0 0 01 11

294 14 1 0 1 0 01 21

5.994 526.14 0 0 0 1 01 11

405 24 1 0 0 1 01 21

5.115 526.24 0 0 0 0 11 11

5.025 573.34 0 2 0 1 11 41

135 52.44 0 2 2 0 11 51

5.835 578.44 1 0 0 2 11 41

945 57.54 1 0 2 1 11 51

855 5.64 0 0 0 0 21 21

5.265 578.64 1 0 0 0 21 31

5.865 573.74 0 1 0 0 21 31

375 57.74 1 1 0 0 21 41

5.085 573.84 0 0 1 0 21 31

5.985 521.94 0 1 2 2 01 51

5.595 526.94 1 1 1 0 21 51

5.406 573.05 0 0 0 0 31 31

516 52.15 0 1 0 0 31 41

5.526 521.25 0 2 0 0 31 51

5.136 526.25 1 0 1 0 31 51

5.736 521.35 0 1 1 0 31 51

156 52.45 0 0 0 0 41 41

5.556 526.45 1 0 0 0 41 51

276 65 0 2 0 0 41 61

876 5.65 1 0 1 0 41 61

5.886 573.75 1 1 1 0 41 71

5.796 521.85 0 0 0 0 51 51

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5.217 573.95 1 1 0 0 51 71

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972 52.32 0 0 0 0 6 6

5.082 573.32 1 0 0 8 0 9

5.982 521.42 0 1 0 0 6 7

5.103 521.52 0 0 1 0 6 7

5.013 578.52 0 0 0 9 0 9

5.523 521.72 0 0 0 0 7 7

033 5.72 1 0 0 0 7 8

543 57.82 0 0 0 01 0 01

5.943 521.92 1 0 0 01 0 11

273 13 0 0 0 0 8 8

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5.814 578.43 0 0 0 0 9 9

564 57.83 0 0 0 0 01 01

5.574 526.93 0 1 0 0 01 11

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294 14 1 0 1 0 01 21

5.994 526.14 0 0 0 1 01 11

405 24 1 0 0 1 01 21

5.115 526.24 0 0 0 0 11 11

5.025 573.34 0 2 0 1 11 41

135 52.44 0 2 2 0 11 51

5.835 578.44 1 0 0 2 11 41

945 57.54 1 0 2 1 11 51

855 5.64 0 0 0 0 21 21

5.265 578.64 1 0 0 0 21 31

5.865 573.74 0 1 0 0 21 31

375 57.74 1 1 0 0 21 41

5.085 573.84 0 0 1 0 21 31

5.985 521.94 0 1 2 2 01 51

5.595 526.94 1 1 1 0 21 51

5.406 573.05 0 0 0 0 31 31

516 52.15 0 1 0 0 31 41

5.526 521.25 0 2 0 0 31 51

5.136 526.25 1 0 1 0 31 51

5.736 521.35 0 1 1 0 31 51

156 52.45 0 0 0 0 41 41

5.556 526.45 1 0 0 0 41 51

276 65 0 2 0 0 41 61

876 5.65 1 0 1 0 41 61

5.886 573.75 1 1 1 0 41 71

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5.217 573.95 1 1 0 0 51 71

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SV4.5CGV-1

Termination

SV4.5FA OR SV4.5FB Flashing AND SV4.5SC STORM COLLAR



SV4.5VF

Firestop/Spacer

SV4.5L6/12/24/36/48 Vent Sections

60' Max

(18.3 M)

1" (25.4 mm) Minimum Clearance to Combustibles



When using Secure Flex use Firestop/Spacer

SF4.5VF

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

VERTICAL TERMINATION SYSTEMS (ROOF)

See Figure 17 on Page 13 and Figures 25 through 27 on Pages 16 and 17 and their associated

Vertical Vent Tables which illustrate the various vertical venting conﬁgurations that are possible for use with these appliances. Secure Vent™ pipe applications are shown in these Figures; Secure Flex™ pipe may also be used. A Vertical Vent Table summarizes each system’s minimum and maximum vertical and horizontal length values that can be used to design and install the vent components in a variety of applications.

Both these vertical vent systems terminate through the roof. The minimum vent height above the roof and/or adjacent walls is speci-

ed in ANSI Z223.1-(latest edition) (In Canada, the current CAN/CSA-B149.1 installation code)

by major building codes. Always consult your local codes for speciﬁc requirements. A general guide to follow is the Gas Vent Rule (refer to

Figure 5 on Page 6).

A vent restrictor may need to be installed when vertical termination is used. See Installation of Vent Restrictor on Page 14 for guidelines.

Vertical (Straight) Installation (Figure 17)

Determine the number of straight vent sections

required. 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 461/2" (1181 mm) net section lengths are available

(see Tables on this page and Page 35 - Vent Sections). It is recommended that you plan the

vent lengths so that a joint does not occur at the intersection of ceiling or roof joists. Refer to the Vent Section Length Chart.

Figure 17

Effective Vent Length

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

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Model Effective Length

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

Table 7

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

Vertical (Offset) Installation

Analyze the vent routing and determine the quantities of vent sections and number of elbows required. Refer to Vertical Vent Figures and Tables on Pages 16 and 17 to select the type of vertical installation desired. Vent sections

are available in net lengths of 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 46-1/2" (1181 mm). Refer to the

Vent Section Length Charts on Page 13 for an aid in selecting length combinations. Elbows are

available in 90° and 45° congurations. Refer to Figure 21 on Page 15 for the SV4.5E45 and SV4.5E90 elbow dimensional specications.

Where required, a telescopic vent section

(SV4.5LA) may be used to provide the installer with an option in installing in tight and conﬁned spaces or where the vent run made up of ﬁxed length pieces develops a joint in a undesirable location, or will not build up to the required

length. The SV4.5LA Telescopic Vent Section has an effective length of from 1-1/2" (38 mm) to 7-1/2" (191 mm). The SV4.5LA is tted with

a locking inclined channel end (identical to a

normal vent section component) and a plain end with 3 pilot holes. Slip the plain end over the locking channel end of a standard SV4.5 vent

component the required distance and secure with three screws.

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

A. Frame ceiling opening - Use a plumb line

from the ceiling above the appliance to locate center of the vertical run. Cut and/or frame an

opening, 10-1/2" x 10-1/2" (267mm x 267mm)

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

10-1/2” Min. (267mm)

Roof Framing

Ceiling Framing

10-1/2” Min. (267mm)

Plumb Bob

Figure 18

B. Attach vent components to appliance Secure Vent SV4.5 direct-vent system compo-

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

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

Align the dimple (4 places) of the upper vent section with the opening of the locking incline channel on the lower vent section or appliance collar. Twist vent component clockwise to engage and seal until

Arrow

Appliance Collar or Vent Section

arrow and dimple align.

Dimple

Locking Incline Channel

Connected Vent Sections

Arrow

Figure 19

To attach a vent component to the appliance collar, align the dimpled end over the collar, adjusting the radial alignment until the four locking dimples are aligned with the inlet of the four inclined channels on the collar (refer to Figure 19). Push the vent component against the collar until it fully engages, then twist the component clockwise, running the dimples down and along the incline channels until they seat at the end of the channels. The unitized design of the Secure Vent™ components will engage and seal both the inner and outer pipe without the need for sealant or

screws. If desired, a #6 x 1/2" screw may be

used at the joint, but is not required as the pipe will securely lock when twisted.

Note: An elbow may also be attached to the appliance collar. Attach in the same manner as you would a vent section.

C. Attach vent components to each other - Other vent sections may be added to the previously installed section in accordance with the requirements of the vertical vent Figures and Tables. To add another vent component to a length of vent run, align the dimpled end over the inclined channel end of the previously installed section, adjusting the radial alignment until the four locking dimples are aligned with the inlets of the four incline channels of the previous section.

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

is indicated by the alignment of the arrow and dimple as shown in Figure 19.

D. Install ﬁrestop/spacer at ceiling - When

using Secure Vent™, use SV4.5VF restop/

spacer at ceiling joists; when using Secure

Flex™, use SF4.5VF restop/spacer. If there is

living space above the ceiling level, the ﬁrestop/ spacer must be installed on the bottom side of the ceiling. If attic space is above the ceiling, the ﬁrestop/spacer must be installed on the top side of the joist.

Route the vent sections through the framed opening and secure the ﬁrestop/spacer with 8d nails or other appropriate fasteners at each corner. Remember to maintain 1" (25

mm) clearance to combustibles, framing members, and attic or ceiling insulation when running vertical chimney sections. Attic insulation shield (H3907) may be used to obtain the required clearances indicated here. See installation accessories Pages 35

and 36. The gap between the vent pipe and a vertical ﬁrestop can be sealed with noncombustible caulking.

E. Support the vertical vent run sections -

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

Support the vertical portion of the venting

system every 8 feet (2.4m) above the replace

vent outlet.

Blocking

Support Straps (Plumber's tape)

8 feet (2.4 m)

Maximum

1/2 inch (12.7 mm) minimum clearance to combustibles

Figure 20

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

One method of support is by utilizing ﬁeld provided support straps (conventional plumber’s

tape). Secure the plumber’s tape to the framing

members with nails or screws. Loop the tape around the vent, securing the ends of the tape to the framing. If desired, sheet metal screws #6 x 1/2" length may be used to secure the support straps to the vent pipe. Refer to Figure 20.

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

clined run, install the SV4.5E45 and SV4.5E90

elbows in the same manner as the straight vent sections. The elbows feature a twist section to allow them to be routed about the center axis of their initial collar section to align with the required direction of the next vent run element.

Twist elbow sections in a clockwise direction only so as to avoid the possibility of unlocking any of the previously connected vent sections

(see Figure 21).

8-1/8"

(206 mm)

Swivel Joint

(360° swivel)

SV4.5E45

(45° Elbow)

4-13/16"

(122 mm)

Swivel Joint

(360° swivel)

SV4.5E90

(90° Elbow)

Figure 21

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

straight vent sections in horizontal/inclined run as described in Step C. Install support straps

every 5 ft. (1.52 m) along horizontal/inclined

vent runs using conventional plumber’s tape.

See Page 18, Figure 28. It is very important that the horizontal/inclined run be maintained in a straight (no dips) and recommended to be in a slightly elevated plane, in a direction away from the ﬁreplace of 1/4 " rise per foot (20 mm per meter) which is ideal, though rise per foot

run ratios that are smaller are acceptable all the way down to at or near level. Use a carpenter’s level to measure from a constant surface and adjust the support straps as necessary.

Framing Dimensions for Roof

Inches (millimeters)

Pitch C D

0/12 10-1/2 in.

(267 mm)

6/12 10-1/2 in.

(267 mm)

12/12 10-1/2 in.

(267 mm)

10-1/2 in. (267 mm)

12 in.

(305 mm) 17 3/4 in.

(451 mm)

Figure 22 - Roof Framing

I. Install the roof ﬂashing - Extend the vent sections through the roof structure. Install the roof ﬂashing over the vent section and position such that the vent column rises vertically (use carpenters level) (Figure 23). Nail along perimeter to secure ﬂashing or adjust rooﬁng to overlap the ﬂashing edges at top and sides only and trim where necessary. Seal the top and both sides of the ﬂashing with waterproof caulking.

J. Install the storm collar - Install the storm collar, supplied with the ﬂashing, over the vent/ ﬂashing joint (see Figure 23). Loosen the storm collar screw. Slide collar down until it meets the top of the ﬂashing. Tighten the adjusting screw. Apply non-combustible caulking or mastic around the circumference of the joint to provide a water tight seal.

Storm

Flashing

Collar

K. Install the vertical termination - The ﬁnal

step involves installation of the SV4.5CGV-1

Vertical Termination. Extend the vent sections

to the height as shown in the "Vertical vent termination section" in Figure 5 on Page 6. The SV4.5CGV-1 Vertical Termination (Figure

24) can be installed in the exact same fashion as any other Secure Vent™ section. Align the termination over the end of the previously installed section, adjusting the radial alignment until the four locking dimples of the termination are aligned with the inlets of the four incline channels of the last vent section. Push the termination down until it fully engages, then twist the termination clockwise running the dimples down and along the incline channels until they are seated at the end of the channels.

Figure 24

If the vent system extends more than 5 feet

(1.5m) above the roof ashing, stabilizers may

be necessary. Additional screws may be used at section joints for added stability. Guide wires may be attached to the joint for additional support on multiple joint conﬁgurations.

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

H. Frame roof opening - Identify location for vent at the roof. Cut and/or frame opening per Roof Framing Chart (Figure 22).

Figure 23

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

VERTICAL VENT FIGURES/TABLES

Notes:

• Secure Vent™ (rigid vent pipe) is shown in the Figures; Secure Flex™ (ﬂexible vent pipe) may also be used.

• It is very important that the horizontal/ inclined run be maintained in a straight (no dips) and recommended to be in a slightly elevated plane, in a direction away from the ﬁreplace of 1/4" rise per foot (20 mm per meter) which is ideal, though rise per

foot run ratios that are smaller are acceptable all the way down to at or near level.

• SV4.5VF (Secure Vent), SF4.5VF (Secure Flex) restop/spacer must be used anytime

vent pipe passes through a combustible

oor or ceiling. SV4.5HF (Secure Vent), SF4.5HF (Secure Flex) restop/spacer must

be used anytime vent pipe passes through a combustible wall.

• Two 45 degree elbows may be used in place

of one 90 degree elbow. The same rise to run ratios, as shown in the venting Figures

for 90 elbows, must be followed if 45 degree

elbows are used.

• AN ELBOW IS ACCEPTABLE AS 1 FOOT OF VERTICAL RISE EXCEPT WHERE AN ELBOW IS THE ONLY VERTICAL COMPONENT IN THE SYSTEM (see Figure 31 on Page 20).

u Ceiling Firestop /

Spacer (SV4.5VF)

vWall Firestop/

Spacer (SV4.5HF)

u When using Secure Flex, use Firestop /

Spacer SF4.5VF.

v When using Secure Flex, use Firestop /

Spacer SF4.5HF.

Figure 26 - Top Vent - TWO 90 DEGREE ELBOWS

Table A

H Maximum

V Minimum

feet (meter) feet (meter)

5 (1.524) Elbow Only

5 (1.524) 1 (0.305) 10 (3.048) 2 (0.610) 15 (4.572) 3 (0.914) 20 (6.096) 4 (1.219)

V + V

+ H = 60 feet (18.3 m) Max.

H = 20 feet (6.096 meters) Max.

Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1(V) to 5(H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H) horizontal run, up to a maximum horizontal run of 20 feet.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system (see Figure 31).

WARNING

Under no circumstances may separate sections of concentric ﬂexible vent pipe be joined together.

60 feet

u Ceiling Firestop /

Spacer (SV4.5VF)

When using

Secure Flex, use Firestop/Spacer SF4.5VF

A Vent Restrictor, as shown in Figure 16 Page 12, must be used in this application

(18.3 meters)

Maximum

Figure 25 - Top Vent - STRAIGHT

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

VERTICAL VENT FIGURES/TABLES (continued)

Table B

H +

Maximum

V Minimum

feet (meter) feet (meter)

5 (1.524) Elbow Only

5 (1.524) 1 (0.305) 10 (3.048) 2 (0.610) 15 (4.572) 3 (0.914) 20 (6.096) 4 (1.219)

H + H1 = 20 feet (6.096 m) Max.

+ H + H1 = 60 ft. (18.3 m) Max.

V + V

u When using Secure Flex™, use Firestop / Spacer SF4.5VF v When using Secure Flex, use Firestop / Spacer SF4.5HF

Figure 27 - Top Vent - THREE ELBOWS

HORIZONTAL (OUTSIDE WALL) TERMINATION SYSTEM

See Figure 28 on Page 18, and Figures 29 through 34 on Pages 19 through 22 and their

associated Horizontal Vent Table which illustrate the various horizontal venting conﬁgurations that are possible for use with these appliances. Secure Vent™ pipe applications are shown in these Figures; Secure Flex™ pipe may also be used. A Horizontal Vent Table summarizes each system’s minimum and maximum vertical and horizontal length values that can be used to design and install the vent components in a variety of applications.

Both of these horizontal vent systems terminate through an outside wall. Building Codes limit or prohibit terminating in speciﬁc areas. Refer to Figure 7 on Page 7 for location guidelines.

Example: If 20 feet total (H+H1) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1(V) to 5(H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H+H1) horizontal run up to a maximum total horizontal run of 20 feet.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system (see Figure 31).

Secure Vent SV4.5 direct-vent system compo- nents are unitized concentric pipe components featuring positive twist lock connection, (refer to Figure 19 on Page 14). All of the appliances covered in this document are ﬁtted with collars having locking inclined channels. The dimpled end of the vent components ﬁt over the appliance collar to create the positive twist lock connection.

A. Plan the vent run - Analyze the vent routing and determine the types and quantities of sections required

4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 46-1/2" (1181 mm) net section lengths are available. It is

recommended that you plan the vent lengths so that a joint does not occur at the intersection

of ceiling or roof joists. Make allowances for

elbows as indicated in Figure 21.

Ceiling

Firestop / Spacer (SV4.5VF)

Wall Firestop/

Spacer (SV4.5HF)

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

B. Frame exterior wall opening -

Locate the center of the vent outlet on the exterior wall according to the dimensions shown in Figure 13 on Page 10. Cut and/

or frame an opening, 10-1/2" x 12-1/8" (267 mm x 308 mm) inside dimensions, about

this center.

C. Frame ceiling opening - If the vertical route is to penetrate a ceiling, use plumb line to locate the center above the appliance. Cut and/or frame

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

to Figure 18 on Page 14).

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Building Support

Framing

SV4.5E90

Elbow

Ceiling

Vertical

Rise

Support

Brackets

Figure 28

D. Attach vent components to appliance - To attach a vent component to the appliance collar, align the dimpled end over the collar, adjusting the radial alignment until the four locking dimples are aligned with the inlets of the four incline channels on the collar (see Figure 19 on Page 14).

Push the vent component against the collar until it fully engages, then twist the component clockwise, running the dimples down and along the incline channels until they seat at the end of the channels. The unitized design of the Secure Vent™ components will engage and seal both the inner and outer pipe elements with the same procedure. Sealant and securing screws are not required.

Note: An elbow may also be attached to the appliance collar. Attach in the same manner as you would a vent section.

E. Attach vent components to each other - Other vent sections may be added to the previously installed section in accordance with the requirements of the vent tables. To add another vent component to a length of vent run, align the dimpled end of the component over the inclined channel end of the previously installed section, adjusting the radial alignment until the four locking dimples are aligned with the inlets of the four incline channels of the previous section.

TYPICAL HORIZONTAL VENT INSTALLATION

Horizontal / Inclined Run

u Firestop / Spacer

SV4.5VF

Support Bracket Spacing

Every 5 ft (1.52 m)

u When Using Secure Flex™,

Use Firestop / Spacer SF4.5VF

See Figure 17 on Page 13 or Figure 20 on Page 14 for vertical vent section support.

Fireplace

is indicated by the alignment of the arrow and dimple as shown in Figure 19 on Page 14.

F. Install ﬁrestop/spacer at ceiling When using Secure Vent, use SV4.5VF restop/

spacer at ceiling joists; when using Secure Flex,

use SF4.5VF restop/spacer. If there is living

space above the ceiling level, the ﬁrestop/spacer must be installed on the bottom side of the ceiling. If attic space is above the ceiling, the ﬁrestop/spacer must be installed on the top side of the joist. Route the vent sections through the framed opening and secure the ﬁrestop/spacer with 8d nails or other appropriate fasteners at each corner.

Remember to maintain 1" (25 mm) clearance to combustibles, framing members, and attic or ceiling insulation when running vertical chimney sections. Attic insulation shield (H3907) may be used to obtain the required clearances indicated here. See installation accessories Tables on Pages 35 and 36.

G. Support the vertical run sections See Section E on Page 15.

H. Change vent direction - At transition from or

to a horizontal/inclined run, install the SV4.5E45 and SV4.5E90 elbows in the same manner as

the straight vent sections.

SV4.5L6/12/24/36/48

Vent Sections

The elbows feature a twist section to allow them to be routed about the center axis of their initial collar section to align with the required direction of the next vent run element. Twist

elbow sections in a clockwise direction only so as to avoid the possibility of unlocking any of the previously connected vent sections (see Figure 19 on Page 14).

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

straight vent sections in horizontal/inclined run as described in Step E. Install support straps

every 5 ft. (1.52 m) along horizontal/inclined

vent runs using conventional plumber’s tape. See Figure 28. It is very important that the

horizontal/inclined run be maintained in a straight (no dips) and recommended to be in a slightly elevated plane, in a direction away from the ﬁreplace of 1/4" rise per foot (20 mm per meter) which is ideal, though rise per foot

run ratios that are smaller are acceptable all the way down to at or near level.

Use a carpenters level to measure from a constant surface and adjust the support straps as necessary.

Typical

Termination

Shown

Exterior

Wall

Typical

Termination

Shown

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

J. Assemble vent run to exterior wall - If not previously measured, locate the center of the vent at the exterior wall. Prepare an opening as described in Step B. Assemble the vent system to point where the terminus of the last section is located relative to the exterior surface to which the termination is to be attached as shown in Figure 30 and Table 8.

If the terminus of the last section is not within this distance, use the telescopic vent section SV4.5LA, as the last vent section. For wall thicknesses greater than that shown in Figure 30, refer to Table 8 on Page 20. This Table lists the additional venting components needed (in

addition to the termination and adaptor) for a

particular range of wall thicknesses.

K. Attach termination adaptor - Attach the

adaptor (SV4.5RCH - provided with the termination) to the vent section or telescoping vent section), elbow or appliance collar as shown in Figure 29 in the same manner as any SV4.5

vent component (refer to Step E).

L. Install Firestop/Spacer at exterior wall -

When using the termination, install SV4.5HF

(Secure Vent™), SF4.5HF (Secure Flex™) Firestop/Spacer over the opening at the exterior

side of the framing, long side up, with the 3

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

(The Firestop/Spacer may also be installed over

the opening at the interior side of framing).

M. Install the Termination (SV4.5HT-2 or SV4.5HTSS)

For the last step, from outside the exterior wall, slide the collars of the termination onto the adaptor (the outer inside the outer and the

inner outside the inner) until the termination

seats against the exterior wall surface to which it will be attached. Orient the housing of the termination with the arrow pointed upwards. Secure the termination to the exterior wall. The

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

IMPORTANT: The vent termination is hot while in operation and for a period of time following the use of the ﬁreplace. Young children should be carefully supervised when they are in the same area as a hot termination. To prevent contact with hot surfaces, we recommend the use of a Termination Guard. See Page 36. This can be purchased at your local dealer.

Termination

(25.4 mm)

Typical

Shown

(76 mm)

5-1/8"

(130 mm)

(178)

12-1/8"

(308 mm)

Adapter

SV4.5RCH

6 to 48 inch Vent Section,

Telescopic vent section,

Elbow or Appliance Collar

Firestop/Spacer (SV4.5HF) shown on the exterior side of the wall. It

may also be installed on the

interior side.

10-1/2"

(267 mm)

Note: Centerline of Vent Piping is

NOT the Same as the Centerline of

the Frame Opening.

See Figure 13 on Page 10 for Min. distance to Base of Appliance

Base of Appliance

See Figure 12 on page 9

for Min. Distance to Base

of Appliance.

Figure 29 - Installing Horizontal Termination

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

*Caulk

Stucco

Siding

Interior Surface of

Finished Wall

Ma xim um E xte nt o f Ve nt R un S ect ion s Rela ti ve to Ex terio r Su rfa ce o f Fr ami ng

Last Vent Section. Use T e le s c op i c V en t Section (SV4.5LA), If Necessary

SV4.5HT-2

Square Termination

Shown

**For thicknesses greater

than 9-1/4", see Table 8.

than 10”, see Table 10.

Adapter

SV4.5RCH

Venting Connection and Exterior Wall Recessing

of the Horizontal Termination

Maximum wall thickness

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

Exterior Surface of Siding

Exterior Surface of

Framing

6 in. to 9-1/4 in.

(152 to 235 mm)**

SV4.5HT-2

Square Termination

Shown

1-1 /4" Maxim um Recess of the Square Termination into Ext er ior Fini sh ing Ma te rial

Figure 30

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

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

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.



Wall Firestop/Spacer

(SV4.5HF)



When using Secure Flex, use Firestop/Spacer

SF4.5VF.



Ceiling

Firestop/Spacer

(SV4.5VF)



When using Secure Flex, use Firestop/Spacer

SF4.5HF.

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

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

Venting Components Required for Various Exterior Wall Thick-

nesses, when using Typical Termination Kits

Vent Components Required Exterior Wall Thickness - inches (mm)

Termination Kit Only 6 to 9-1/4 (152 to 235)

Termination Kit and 6 In. Vent

Section (SV4.5L6)

Termination Kit and 12 in.

Vent Section (SV4.5L12)

Termination Kit and Tele-

scopic Section (SV4.5L12)

Table 8

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

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

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

Note: See Figure 30 showing wall thickness range when using SV4.5HT-2 termination kit.

Table C

H Maximum V Minimum

feet (meter) feet (meter)

3 (0.914) Elbow Only (30/35/40 Models)

2.5 (0.762) Elbow Only (45 Model)

Typical termination shown.

HORIZONTAL VENT FIGURES/TABLES Notes:

• Secure Vent™ components (rigid vent pipe and terminal) are shown in the Figures; Secure Flex™ components (ﬂexible vent pipe and

terminal) may also be used.

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

The same rise to run ratios, as shown in the venting Figures for 90

elbows, must be followed if 45 degree elbows are used.

• SV4.5VF (Secure Vent), SF4.5VF (Secure Flex) restop/spacer must be

used anytime vent pipe passes through a combustible ﬂoor or ceiling.

SV4.5HF (Secure Vent), SF4.5HF (Secure Flex) restop/spacer must

be used anytime vent pipe passes through a combustible wall.

• It is very important that the horizontal/inclined run be maintained in a straight line (no dips) and recommended to be in a slightly elevated

plane, in a direction away from the replace of 1/4" rise per foot (20 mm per meter) which is ideal, though rise per foot run ratios that are

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

• The tables show a 1(V) to 5(H) ratio up to a maximum horizontal run

of 20 feet except for installations where an elbow is the only vertical vent section in the system (see Figure 31).

• AN ELBOW IS ACCEPTABLE AS 1 FOOT OF VERTICAL RISE EXCEPT WHERE AN ELBOW IS THE ONLY VERTICAL COMPONENT IN THE SYSTEM (see Figure 31).

When using Secure Flex,

use Firestop/Spacer

SF4.5HF

Wall

Firestop/Spacer

(SV4.5HF)

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

Figure 31 - Top Vent -

ONE 90 DEGREE ELBOW - ELBOW CONNECTION AT APPLIANCE

Table D

H Maximum

V Minimum

feet (meter) feet (meter)

5 (1.524) 1 (0.305) 10 (3.048) 2 (0.610) 15 (4.572) 3 (0.914) 20 (6.096) 4 (1.219)

V + H = 60 feet (18.3 m) Max.

H = 20 ft. (6.096 m) Max.

Example: If 20 feet of (H) horizontal vent run is needed,

then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1(V) to 5(H) ratio. For every 1 foot of vertical, you are allowed 5 feet of (H) horizontal run up to a maximum (H) horizontal run of 20 feet.

Under no circumstances, may separate sections of concentric ﬂexible vent pipe be joined together.

WARNING

Typical termination shown.

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 32 - Top Vent - ONE 90 DEGREE ELBOW -

ELBOW CONNECTION NOT DIRECTLY AT APPLIANCE

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

HORIZONTAL VENT FIGURES / TABLES (continued)

Wall Firestop/Spacer



(SV4.5HF)

Note - When using



Secure Flex

Firestop/Spacer SF4.5VF.

When using Secure Flex,



use Firestop/Spacer

Typical termination shown.

See Table 8 on Page 20 as an aid in venting component selection for a particular range of exterior wall thicknesses.

SF4.5HF.

, use

Wall Firestop/Spacer



(SV4.5HF)

Firestop/Spacer



(SV4.5VF)

Figure 33 - Top Vent - TWO 90-DEGREE ELBOWS

Ceiling

Table E

+ H

Maximum

V Minimum

feet (meter) feet (meter)

3 (0.914) Elbow Only

5 (1.524) 1 (0.305) 10 (3.048) 2 (0.610) 15 (4.572) 3 (0.914) 20 (6.096) 4 (1.219)

V + H + H1 = 60 feet (18.3 m) Max.

H + H

= 20 ft. (6.096 m) Max.

Example: If 20 feet of (H + H1) horizontal vent run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1(V) to 5(H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H+ H to a maximum horizontal run of 20 feet.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system. See Figure 31.

) horizontal run, up

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

HORIZONTAL VENT FIGURES / TABLES (continued)

Typical termination shown.

Wall Firestop/Spacer



(SV4.5HF)

See Table 8 on Page 20 as an aid in venting component selection for a particular range of exterior wall thicknesses.



Flex, use Firestop/Spacer

Wall Firestop/Spacer



(SV4.5HF)

When using Secure Flex use Firestop/Spacer

SF4.5VF.

When using Secure



SF4.5HF.

Ceiling



Firestop/Spacer

(SV4.5VF)

Table F

TM,

+ H

Maximum

V Minimum

feet (meter) feet (meter)

5 (1.524)

Elbow Only

5 (1.524) 1 (0.305) 10 (3.048) 2 (0.610) 15 (4.572) 3 (0.914) 20 (6.096) 4 (1.219)

+ H1 = 20 feet (6.096 m) Max.

V + V

+ H + H1 = 60 ft. (18.3 m) Max.

Example: If 20 feet total (H+H1) horizontal vent

run is needed, then 4 feet minimum of (V) vertical vent will be required.

This table shows a 1(V) to 5(H) ratio. For every 1 foot of (V) vertical, you are allowed 5 feet of (H+ H

) horizontal run, up to a maximum horizontal

run of 20 feet.

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system. See Figure 31.

Figure 34 - Top Vent - THREE 90 DEGREE ELBOWS

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

VERTICAL OR HORIZONTAL VENTING USING SECURE FLEX™ KITS AND COMPONENTS

Secure Flex™ venting kits and components

may be used in any venting application in place of rigid Secure Vent™ (SV4.5) direct-vent components. All restrictions, clearances and allowances that pertain to the rigid piping apply to the ﬂexible venting. Secure Flex kits may

not be modiﬁed; also, under no circumstances may separate sections of ﬂex pipe be joined together.

Using adaptor (SV4.5RF), Secure Flex kits may be added to the end of a vent run made up of rigid Secure Vent (SV4.5) vent sections provided that doing so does not violate any of the venting length, height, routing, horizontal to vertical ratio requirements or clearance considerations detailed in this manual.

Secure Flex kits come with an adaptor that can be ﬁtted to the inclined channel end of the last Secure Vent (SV4.5) vent section in a rigid system in the exact same fashion as any other Secure Vent section. Align the dimpled end of the adaptor over the previously installed section or appliance collar, adjusting the radial alignment until the four locking dimples of the adaptor are aligned with the inlets of the four incline channels of the last vent section or collar. Push on the adaptor until it fully engages, then twist the adaptor clockwise running the dimples down and along the incline channels until they seat at the end of the channels.

Attach the ﬂexible vent to the adaptor as follows (see also Figure 35): A. Install the Inner Flex Pipe -

1. Install the small gear clamp loosely around

the inner ﬂexible vent pipe, push it back out of the way.

2. Apply a bead of Mill-Pac Black (700° F) high temperature sealant - Catalog No. 10K81

to the inner adaptor collar, approximately 1/2 inch from the end.

3. Pull and extend the inner ﬂexible vent pipe.

4. Slide the inner ﬂex pipe over the adaptor col-

lar. Ensure the ﬂexible vent pipe completely engages the adaptor collar to a distance of

1-3/4 inches from the end, and that it is free

from damage or tears.

5. Slide the gear clamp down and tighten it fully to secure the ﬂexible vent to the adaptor

inner collar approximately 3/4 inch from the

end of the ﬂex.

6. Install three screws, 120 degrees apart, through the ﬂexible vent pipe and into the adaptor collar just below the gear clamp to provide additional security to the connection.

NOTE: Outer pipe is pulled away to show the detail of the inner pipe.

APPLY ONLY MIL-PAC BLACK HIGH TEMPERATURE SEALANT (Cat. No. 10K81) to the outside surface of both collars of the adaptor (be especially careful to ﬁll the grooves of the outer collar to be covered by the ﬂexible pipe) and slide ﬂexible pipe over inner and outer adaptor collars.

1-3/4 inch (44 mm) ﬂexible pipe and adaptor outer collar overlap

Adaptor (SV4.5RF)

Figure 35

Attach adaptor to appliance

Collar, or secure vent sections

B. Install the Outer Flex Pipe -

1. Install the large gear clamp loosely around

the outer ﬂexible vent pipe, push it back out of the way.

2. Apply a bead of Mill-Pac Black (700° F, high temperature sealant - Catalog No. 10K81)

to the outer adaptor collar; to the grooves of the collar which extend approximately 1 inch from the end and to the ﬂat surface,

approximately 1-3/8 inches from the end.

3. Pull and extend outer ﬂexible vent pipe.

4. Slide the outer ﬂex pipe over the adaptor col-

lar. Ensure the ﬂexible vent pipe completely engages the adaptor collar to a distance of

1-3/8 inches from the end, and that it is free

from damage or tears.

5. Slide the gear clamp down and tighten it fully to secure the ﬂexible vent to the adaptor

outer collar approximately 3/4 inch from the

end of the ﬂex.

6. Install three screws, 120 degrees apart, through the ﬂexible vent pipe and into the adaptor collar just below the gear clamp to provide additional security to the connection.

C. Route Flex Vent -

Ensure that the ﬂex vent is properly routed to provide the required clearance. Do not allow the

exible vent to bend in a radius tighter than 5" (127 mm). Refer to Figure 36. Space out the

internal ﬂex vent spacers evenly - approximately every 6 inches - and avoid kinking of inner pipe. Support horizontal sections of ﬂex with metal

straps at 2 foot (0.61 m) intervals.

Flex Vent

Securing Screw - 3 places, equally spaced, just below gear clamp.

Gear Clamps

1-3/4 in. (44 mm) ﬂexible pipe and adaptor inner collar overlap

Securing Screw - 3 places, 120° apart (equally spaced) just below gear clamp

D. Install Firestop / Spacers at ceilings and walls -

When Secure Flex penetrates a wall or ceiling, a restop / spacer is required: use the SF4.5 VF restop / spacer for ceilings and the SF4.5 HF

ﬁrestop / spacer for walls. See the appropriate sections and Figures shown throughout the venting section for their installation requirements.

Flexible Vent Section

5” (127 mm)

Radius

Figure 36

Minimum

E. Attach Flex Vent to Termination - Secure Flex components can be purchased separately and attached to bulk lengths of Secure Flex ﬂexible tubing cut to size at the job

site. Secure the ﬂexible vent to the Secure Flex terminations in the same manner (see Figure

35) as it was attached to the adaptor.

Note: Secure Flex vent must be attached to Secure Flex terminations only. DO NOT substitute Secure Vent terminations or the Secure Vent adaptor for Secure Flex components. The collars of Secure Flex terminations and adaptors have a different diameter than that used with the Secure Vent pipe. Additionally, Secure Flex components have an extended length center tube for use in attaching the ﬂexible vent.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

TP-TH

APPLIANCE- MOUNTED ON/OFF SWITCH (OPTIONAL)

BK/W(1)

WALL-MOUNTED ON/OFF SWITCH (OPTIONAL) THERMOSTAT (OPTIONAL)

JUNCTION BOX

BLACK

120 V

WALL MOUNTED CONFIGURATION FOR FAN SWITCH (OPTIONAL)

WIRING DIAGRAM MILLIVOLT GAS VALVES

THERMOPILE

GAS VALVE

FAN

(OPTIONAL)

Step 4. FIELD WIRING

CAUTION

Ground supply lead must be connected to the wire attached to the green ground screw located on the outlet box. See

Figure 38. Failure to

do so will result in a potential safety hazard. The appliance must be electrically grounded in accordance with local codes or, in the absence of local codes, the National Electrical Code, ANSI/NFPA 70-latest edition.

(In Canada, the current CSA C22-1 Canadian Electrical Code).

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

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

Verify proper operation after servicing.

S’assurer que l'appareil fonctionne adéquatement une fois l'entretien terminé.

Refer to Section A for millivolt appliances and Section B for electronic appliances. The gas valve is set in place and pre-wired at the factory on both models.

A. Millivolt Wiring (see Figure 37)

1. Appliance-mounted ON/OFF burner control

switch (rocker switch) is factory installed

behind the bottom panel. Optional wallmounted switch, thermostat, or one of the optional remote control kits may also be used.

2. If wall-mounted ON/OFF control switch ther-

mostat is selected, mount it in a convenient location on a wall near the ﬁreplace.

3. Wire the control switch within the millivolt

control circuit using the 15 feet of 2 conductor wire supplied with the unit.

Note: The supplied 15 feet of 2 conductor

wire has one end of each conductor connected to the gas valve circuit and the other end of each conductor placed loose inside the bottom compartment.

4. If an optional control switch is installed,

turn the appliance-mounted ON/OFF burner control switch to the OFF position.

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

B. Electronic Wiring (see Figure 38)

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

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

supply to the appliance junction box.

2. Remove the electrical inlet cover plate from

the side of the unit by removing the plate's

securing screws (see Figure 13 on Page

10).

3. Remove the cover plate’s knockout and then

feed the power supply wire through the knockout opening and into the unit junction box.

4. Connect the black power supply wire to the lower outlet's red pigtail lead and the white

power supply wire to the common terminal of the outlet as shown in Figure 38.

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

6. Appliance-mounted ON/OFF burner control

switch (rocker switch) is factory installed

behind the bottom panel.

Optional wall-mounted switch, thermostat, or one of the optional remote control kits may also be used. The appliance mounted ON/OFF switch needs to be relocated onto the optional style view door, if used.

Figure 37

120 VAC

OPTIONAL BLOWER SWITCH

JUNCTION BOX

TRANSFORMER 3V

FAN

(OPTIONAL)

TO WALL SWITCH OR THERMOSTAT

Figure 38

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

INTERMITTENT ELECTRONIC WIRING DIAGRAM

BROWN

IGNITER MODULE

BLACK

BATTERY BACK-UP

RED

ORANGE (THTP)

BLACK (TP)

GREEN (TH)

BLACK (IGNITER)

BLACK (SENSOR)

SPARK TO PILOT IGNITER

See Figure 39 for detailed drawing of junction box / receptacle wiring

OUT

VENT

PILOT

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

BLOWER CONTROL CIRCUIT WIRING

Receptacle

Note: Remote receiver should be located in the wall, or if installed in the control compartment, pulled all the way forward and completely to the left or right against the corner posts. The door must be removed ﬁrst to place the receiver in the lower control compartment.

7. If wall-mounted ON/OFF control or thermo-

stat is to be used, mount it in a convenient location on a wall near the ﬁreplace.

8. If an optional control is to be used, wire it in

the low voltage circuit as shown in Figure

38.

Note: The supplied 15 feet of 2 conductor wire

has one end of each conductor connected to the gas valve circuit and the other end of each conductor placed loose inside the bottom compartment.

9. If the optional unit mounted (FRS) control

switch is installed, turn the appliancemounted ON/OFF burner control switch to the OFF position.

10. After the wiring is complete, replace the

cover plate.

Note: No batteries to be installed in the battery holder until a power outage, or if the appliance is to be operated solely with two (2) "D" batteries.

neerG - dnuorG

etihW - lar

t ueN

Black

White

Green

Plug blower into this receptacle

Blower

Ground

120V, 60HZ, 1PH

* Wall-mounted ON/ OFF Blower Switch or Variable Speed Control Switch.

120 VAC - Black

Junction Box

Tab Broken

Tab Intact

Field Wired

Factory Wired

Red

Hot Side of

Neutral Side of

Green Ground Screw

Step 5. WIRING: OPTIONAL FORCED AIR BLOWER KIT

Blower Access

Blower access is through the ﬁrebox bottom. Remove the sub-ﬂoor, remove the burner and remove ten screws securing the GTA assembly to the ﬁrebox.

An electrical outlet box is provided for the installation of the FBK-100 and FBK-200 forced air blower kit. Electrical power must be provided to this box to operate these blowers.

Install the blower kit according to the installation instructions provided with the kit. Reposition and reinstall the GTA assembly, burner and sub-ﬂoor.

Figure 39 - J-BOX WIRING

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Gas Valve

3/8" NPT x

Flare Fitting

3/8" Flex Tubing

3/8" Nipple

3/8" Union

3/8" Close Nipple

3/8" Shut-off Valve

1/2" x 3/8"

Reducer

Gas

Stub

1/2" x 3/8" Flare

Shut-off Valve

Gas Solid Line Connector

Gas Flex Line Connector

*Sediment Trap

Min

Step 6. CONNECTING GAS LINE

All codes require a shut-off valve mounted in the supply line. The orientation of the shut-off valve should face the front. Figure 40 illustrates two methods for connecting the gas supply. A Sediment Trap is recommended to prevent moisture and debris in gas line from damaging the valve.

The ﬂex-line method is acceptable in the U.S.A. where local codes permit, however, Canadian requirements vary depending on locality. Installation must be in compliance with local codes. These appliances are equipped with a gas ﬂex-line for use in connecting the unit to the gas line. See Figure 40 for ﬂex-line description. The ﬂex-line is rated for both natural and propane gas. A manual shut off valve is also provided with the ﬂex-line.

The gas control valve is located in the lower control compartment.

Access the valve compartment by removing the lower control compartment panel (see Figure

41) by lifting and pulling the panel forward. The panel is mounted on supporting tabs at the extreme right and left hand sides. Engage the tabs into the reliefs in the panel.

Figure 40

GAS CONNECTION

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

The millivolt and electronic control valve has a

3/8" (10 mm) NPT thread inlet port.

Secure all joints tightly using appropriate tools and sealing compounds (ensure propane resistant compounds are used in propane applications). It is recommended to seal around the gas line to prevent cold air leakage.

Gas line connection may be performed largely outside of the conﬁnes of the control compartment and without having to enter the ﬁrebox behind the glass. Proceed as follows:

Acquire the shut-off valve and gas lex line and pull the assembly forward out of the compartment. Separate the shut-off valve from the gas ﬂex-line. Determine the length of pipe needed to route the gas line from the last ﬁtting (shown in Figure 15 on Page 11) to a point within the control compartment that will allow the shutoff valve to be easily attached by hand to the gas ﬂex-line.

Using pipe-dressing materials appropriate for the gas type, securely afﬁx the shut-off valve to this determined pipe length at a convenient location outside of the appliance lower control compartment.

Gas Shut-Off Valve

Gas Flex Line

Valve

Figure 41

Refer to Figure 42 and insert the last length of gas pipe with its attached shut-off valve into the lower control compartment, and pass it through the gas line access hole on the left side of the appliance outer wrapper. Using appropriate materials for the gas type, thread the last length of pipe into the end of the gas vent run and tighten in place using a pipe wrench external to the appliance between the appliance outer wrapper and the framing.

Important: Turn the last piece of gas pipe in the last ﬁtting until the shut-off valve is positioned in a way that allows the shut-off valve handle to be accessed in the lower control compartment, easily operated throughout its full range of motion.

Bring the ﬂex-line to the shutoff valve by hand and align the ﬂare ﬁttings. Tighten the ﬁttings by hand, and then use wrench to tighten com-

pletely, 1/4 turn at a time.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Piezo

Figure 42

Lower Control

Compartment

Length Of Pipe With Attached Shut-Off Valve

Spring Door

Latch

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

MILLIVOLT

Thermocouple

Hood Igniter Rod

3/8" Min (9 mm)

Thermopile

Pilot Nozzels

TEST ALL CONNECTIONS FOR GAS LEAKS (FACTORY AND FIELD)

WARNING

Never use an open ﬂame to check for leaks.

Turn on gas supply and test for gas leaks, using a gas leak test solution (also referred to as

bubble leak solution).

Note: Using a soapy water solution is an effective leak test solution but it is not recommended, because the soap residue that is left on the pipes/ ﬁttings can result in corrosion over time.

A. Light the appliance (refer to the lighting

instructions label in the control compartment or in the Care and Operation Instructions

manual).

B. Brush all joints and connections with the gas

leak test solution to check for leaks. If bubbles are formed, or gas odor is detected, turn the

gas control knob (off/pilot/on) to the “OFF”

position. Either tighten or refasten the leaking connection, then retest as described above.

C. When the gas lines are tested and leak free,

be sure to rinse off the leak testing solution.

Step 7. VERIFYING APPLIANCE OPERATION

Turn on burner then observe the individual

tongues of ame on the burner. Make sure

all ports are open and producing ﬂame evenly across the burner. If any ports are blocked, or partially blocked, clean out the ports.

With gas line installed run initial system

checkout before closing up the front of the unit. Follow the pilot lighting instructions provided in the Care and Operation Instructions manual. For piezo igniter location see Figure 41 on

Page 26 (millivolt appliances only).

Note: Lighting Instructions are also found on

the literature tag tied to the gas piping next to the gas valve. To access the tag, open the lower control compartment door (Figure 41 on Page 26) by pulling the panel forward.

When rst lighting the appliance, it will take

a few minutes for the line to purge itself of air. Once purging is complete, the pilot and burner will light and operate as indicated in the instruction manual. Subsequent lighting of the appliance will not require such purging. Inspect the pilot ﬂame (remove logs, if neces-

sary, handling carefully).

Millivolt Appliance Checkout

The pilot ﬂame should be steady, not lifting or ﬂoating. Flame should be blue in color with traces of orange at the outer edge.

The top 3/8" (10 mm) at the pilot generator (thermopile) and the top 1/8" minimum (tip)

of the quick drop out thermocouple should be engulfed in the pilot ﬂame.

The ame should project 1" (25 mm) beyond

the hood at all three ports (see Figure 43). Replace logs if removed for pilot inspection.

To light the burner; turn “ON” the remote wall

switch and rotate the gas valve control knob

counterclockwise to the “ON” position (“ON” will be at the top side of the valve).

Figure 43

Electronic Appliance Checkout

To light the burner, turn ‘ON’ the unit mounted On/Off switch or the optional remote wall switch. Ensure the igniter lights the pilot. The pilot ﬂame should engulf the ﬂame sensor as shown in Figure 44.

ELECTRONIC

Sensor

Igniter

Pilot Hood

Figure 44

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 8. INSTALL VOLCANIC STONE, GLOWING EMBERS, AND LOGS

NOTE: Turn off all electricity to the appliance before you install volcanic stone, embers and logs.

1. Remove the front glass enclosure panel

(see Removing Glass Enclosure Panels on Page 31).

2. Locate log set, embers and volcanic stone. Handle logs carefully to prevent breakage.

3. Install decorative volcanic stone - Sprinkle

the decorative volcanic stone in a pleasing pattern (see Figure 45). The volcanic stone should be placed directly on top of the ﬁrebox bottom, along the slope and to the back at the right and left sides of the burner. Position any ceramic ﬁber liners before placing the stone. Logs can be positioned after the volcanic stone.

Volcanic Stone

Place Volcanic

Figure 45

4. Placement of Glowing Embers -

Separate the Embers (rockwool) into pieces

about the size of a quarter (see Figure 46). Keep the pieces ﬂuffed up, not matted. Distribute these pieces over the surface of the burner, as shown in Figures 47 and 48. Do not use more than is necessary. Ensure that

the main burner slots remain uncovered by the ember material. Position the embers on

the small holes of the ember bed area.

Note: This appliance is provided with enough Glowing Embers for several applications, do not use all that is in a new bag at one time. For best glowing effect, replace the ember material annually.

Stone As Shown

Glowing Embers

Separate into Quarter

Size (separate) Pieces

Bag of Glowing

Embers (rockwool)

Figure 46

5. Placement of Logs -

The logs have locating notches or slots to help ensure that they are properly positioned. The top logs that rest on lower logs, do so over notches, indents or nubs. Proper log placement is critical to prevent sooting. Logs should be placed in the gaps between the ﬂame peaks and should be positioned so they do not impinge the ﬂames. Follow the log placement instructions, exactly.

MLDVT-30 & MLDVT-35 - Install the ﬁve logs as Follows:

Carefully position the ceramic ﬁber logs over the burner as shown in Figure 47. Logs should be placed in the order shown and per the following instructions.

1. Place the rear log (1) as shown. Position it on the left rear log bracket.

2. Place the left front log (2) as shown. Posi- tion it against the left front of the log rack.

3. Place the right front log (3) as shown. Posi- tion it against the right front of the log rack.

4. Place the left cross log (4) as shown. Posi- tion it over the rear log (1), with the front of

the log resting on the log rack.

5. Place the right cross log (5) as shown. Position it over the right log (3), and rest the

rear of the log over the right rear bracket.

MLDVT-40 & MLDVT-45 - Install the ﬁve logs as Follows:

Carefully position the ceramic ﬁber logs over the burner as shown in Figure 48. Logs should be placed in the order shown and per the following instructions.

1. Place the rear log (1) as shown. Position it on the left rear log bracket.

2. Place the left front log (2) as shown. Posi- tion it against the left front of the log rack.

3. Place the right front log (3) as shown. Posi- tion it against the right front of the log rack.

4. Place the left cross log (4) as shown. Posi- tion it over the rear log (1), with the front of the log resting over log (2).

5. Place the right cross log (5) as shown. Position it over the right log (3), and rest the

rear of the log over the right rear bracket.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

REFERENCE

Firebox Accessories / Parts

Cat. No. Model No. Description

88L53 FGE Bag of Glowing Embers

80L42 FDVS

Bag of Decorative Volcanic Stone

WARNING

• DO NOT attempt to install the

logs until the appliance installation has been completed, the gas line connected and tested for leaks and the initial burner operation has been checked out.

• Thesizeandpositionofthelog

set was engineered to give the appliance a safe, reliable and attractive ﬂame pattern. Any attempt to use a different log set in the ﬁreplace will void the warranty and will result in incomplete combustion, sooting, and poor ﬂame quality.

• Logs get very hot and will

remain hot up to one hour after gas supply is turned off. Handle only when logs are cool. Turn off all electricity to the appliance before you install grate, volcanic stone, vermiculite, embers and logs.

• Thisapplianceisnotdesigned

to burn wood. Any attempt to do so could cause irreparable damage to the appliance and prove hazardous to your safety.

• If logs are not installed

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

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

MLDVT-30 & MLDVT-35 LOG PLACEMENT (model-35 shown; model-30 similar)

Left Rear Log Bracket

Log Number Description

1 Rear Log 2 Left Front Log

3 Right Front Log 4 Left Cross Log

5 Right Cross Log

Catalog Number for the entire log set:

MLDVT-30: H7839 MLDVT-35: H7666

Right Rear Log Bracket

Position against the right

side of the log rack

(Do not place glowing ember over burner slots)

Position on the left

rear log bracket

Figure 47

Glowing Embers

Step 1

Step 2

Right Rear Log Bracket

Log RackVolcanic Stone

Position against the left

side of the log rack

Step 3

Position on the right rear log bracket

Position over rear log (1) and against log rack

Step 4

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

MLDVT-40 & MLDVT-45 LOG PLACEMENT (model-40 shown; model-45 similar)

Position on the left

rear log bracket

Log Number Description

1 Rear Log 2 Left Front Log

3 Right Front Log 4 Left Cross Log

5 Right Cross Log

Catalog Number for the entire log set:

MLDVT-40: H7667 MLDVT-45: H7840

Right Rear Log Bracket

Rest over log (1) and log (2) with

the front resting on the log rack.

Glowing Embers

(Do not place glowing embers over burner slots)

Step 1

Position the left front log (2) and the right front log (3) against the log rack.

Step 2

Figure 48

Log RackVolcanic Stone

Step 3

Position on the right rear log

bracket and over log (3)

Step 4

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 9. INSTALLATION AND REMOVAL OF GLASS DOOR

WARNING

• Do not attempt to substitute the materials used on these doors, or replace cracked or broken glass.

•Handlethisglasswithextreme

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

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

• Do not attempt to touch the front enclosure glass with your hands while the ﬁreplace is in use.

WARNING

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

AVERTISSEMENT

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

Only doors certiﬁed with the appliance shall be used.

Seules des portes certiﬁées pour cet appareil doivent être utilisées.

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

3. Pull the bottom of the door out a few inches

and grasp it on the right and left. Gently lift to release the door from its channel above the door. Pull the door forward.

4. Retrieve the glass door. Visually inspect the

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

5. Inspect the gasket for defects. Ensure it is

properly located. Make sure the bead is not

rolled up into the channel at the top of the door, but remains ﬂat against the top of the glass.

6. Position the door in front of the ﬁrebox open-

ing with the bottom of the door held away from the ﬁreplace. Hook the top ﬂange of the door frame over the top of the ﬁrebox frame.

7. Let the bottom of the door frame swing

gently in towards the ﬁreplace ensuring that the gasket seats evenly as the door frame draws shut. Fasten the two latches located

underneath the rebox oor to the door's

vee-ﬂange. Close both the latches securely.

8. Install the hood. Note the location of the three

clips inside the top air channel above the door. The clips are equally spaced on the top surface of the air channel opening. Use a screwdriver to open the clips slightly if needed. Engage the back edge of the eyebrow into the clips to secure.

Ensure Gasket Is Not Rolled

Up Into Door Frame Channel

Glass Door

Glass Door Spring Latch

Header Spacing Top Standoffs

5/8” Nailing Flange

1/2” Nailing Flange

Flush Nailing Flange

Step 10. BURNER ADJUSTMENTS

Flame Appearance and Sooting

Proper ﬂame appearance is a ﬂame which is blue at the base and becomes yellowish-orange in the body of the ﬂame.

When the appliance is rst lit, the entire ame

may be blue and will gradually turn yellowishorange during the ﬁrst 15 minutes of operation. After 15 minutes of operation, if the ﬂame is blue, or if the ﬂame is orange with evidence of

sooting (black tip), the air shutter opening may

need to be adjusted.

If the air shutter opening is closed too far, sooting may develop. Sooting is indicated by black puffs developing at the tips of very long orange ﬂames. Sooting results in black deposits forming on the logs, appliance inside surfaces and on exterior surfaces adjacent to the vent termination.

Sooting is caused by incomplete combustion in the ﬂames and lack of combustion air entering the air shutter opening. To achieve a warm yellowish-orange ﬂame with an orange body that does not soot, the shutter opening must be adjusted between these two extremes.

Air Shutter Adjustment Guidelines

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

the log set positioning to ensure that the ﬂames are not impinging on any of the logs. If the log set is properly positioned and a sooting condition still exists, then the air shutter opening should be increased.

• The more offsets in the vent system, the larger

the air shutter opening will need to be.

• An appliance operated with the air shutter

opened too far, may have ﬂames that appear blue and transparent. These weak, blue and transparent ﬂames are termed anemic.

• Propane models may exhibit ames which

candle or appear stringy. If this is present and persists, adjust the air shutter to a more closed position, then operate the appliance for a few more minutes to ensure that the ﬂame normalizes and the ﬂames do not appear sooty.

The following chart is provided to aid you in achieving the correct air shutter adjustment for your installation.

Removing Glass Enclosure Panel (see Figure 49)

1. To access the glass door securing latches,

lift and pull the bottom panel forward to open the lower control compartment door.

2. Pull the latches forward and down to release

them from the door channel.

Control Compartment Panel

INSTALLING/REMOVING GLASS DOOR

Note: When installing glass door, make sure spacing on both sides is equal.

Hood

Figure 49

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Air Shutter Adjustment Guidelines:

Amount of

Primary Air

If air shutter is closed too far

If air shutter is open too far

Flame

Color

Flame will be orange

Flame will be blue

Air Shutter

Adjustment

Air shutter gap should be increased

Air shutter gap should be decreased

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

Burner Air Shutter Adjustment Procedure

Adjustment Set-Screw

WARNINGS

• Air shutter adjustment should

only be performed by a qualiﬁed professional service technician.

• Ensure front glass panel are

in place and sealed during adjustment.

CAUTIONS

• Soot will be producedifthe

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

• The air shutter door and nearby

appliance surfaces are hot. Exercise caution to avoid injury while adjusting ﬂame appearance.

Adjustment Rod Up

Burner Tube

Air Shutter

Adjustment Rod Down (fully open air opening position)

(closed min. position)

Ref. Air shutter Patent: U.S. Pat. 5,553,603

Figure 50 - Burner Air Shutter Adjustment

Main Burner Factory Air Shutter

Opening Setting - Inches (millimeter)

Model Nat.Gas Propane Gas

MLDVT-30 1/32 (0.794) 1/8 (3.175) MLDVT-35 1/32 (0.794) 1/8" (3.2) MLDVT-40 1/32 (0.794) 1/4" (6.4) MLDVT-45 1/32 (0.794) 3/16" (4.8)

1. Locate adjustment rod and adjust air shutter

to the standard setting as shown in Figure 50 (adjustment rod is located in the lower

control compartment).

Note: Move the adjustment rod down to

decrease air and up to increase.

2. Light appliance (follow lighting procedure

on lighting label in control compartment or

see the Care and Operation Manual).

3. Allow the burner to operate for at least 15

minutes while observing the ﬂame continuously to ensure that the proper ﬂame appearance has been achieved (see Figures 51 and 52). If the following conditions are present, adjust accordingly.

• If ame appears weak or sooty, adjust

the air shutter, incrementally, to a more open position until the proper ﬂame appearance is achieved.

• If ame stays lowered blue, adjust the

air shutter, incrementally, to a more closed position until the proper ﬂame appearance is achieved.

4. Leave the control knob (off/pilot/on) in the

ON position and the burner OFF/ON switch

OFF (and remote switches, if applicable).

5. When satised that the burner ame appear-

ance is normal, re-install the lower control compartment door then proceed to ﬁnish the installation.

Figure 51 - Burner Flame Appearance Model MLDVT-30 & MLDVT-35

Figure 52 - Burner Flame Appearance Model MLDVT-40 & MLDVT-45

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 11. HOOD INSTALLATION

(Refer to Figure 53) All models must have a hood installed prior to operating.

Install hood by sliding it into the slots on the lower edge of the cabinet top.

FINISHING REQUIREMENTS - Wall Details

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

See Page 5 for Cold Climate Insulation

and Page 8 for Clearances

Combustible

Finished

Wall Materials

Header

Combustible material may

touch appliance top.

Hood

3" Clearance Min.

Figure 53 - Combustible Wall Framing

This area must remain clear of combustible materials.

1 in. Min.

(25 mm)

Top of Appliance

(76 mm)

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

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

ATTACHING SAFETY-IN-OPERATION WARNINGS

Your ﬁreplace has been furnished with safety instruction labels that are to be afﬁxed to the operation and control point of the ﬁreplace. A safety instruction label should be afﬁxed to the wall switch plate where the ﬁreplace is turned on and off (See Figure A) or wall thermostat (See Figure B) and if used on the remote control handheld transmitter (Figure C). The warnings should already have been put in place when the ﬁreplace initial set-up was completed. If they are not afﬁxed at these spots, locate the multi-lingual adhesive labels provided with these instructions and proceed as follows:

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

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

wall switch plate or wall thermostat thoroughly to remove any dust and oils. Afﬁx the label to the surface of the plate of the wall switch that controls the ﬁreplace (Figure A) or the wall thermostat (Figure B). Choose the language primarily spoken in the home.

2. If a remote control is used to control the ﬁreplace, locate the transmitter and clean it thoroughly to remove any dust and oils. Afﬁx the label to the surface of handheld transmitter (Figure C). Choose the language primarily spoken in the home.

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

Lennox Hearth Products or your nearest Lennox Hearth Products dealer to receive additional safety instruction labels free of charge.

Cat. No. H8024 Replacement Label Kit

LENNOX HEARTH PRODUCTS 1-800-9-LENNOX

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

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

Votre foyer a été livré avec des étiquettes de sécurité qui doivent être collées à côté des dispositifs de contrôle du foyer. Une étiquette de sécurité doit être collée sur la plaque de l’interrupteur contrôlant l’allumage du foyer (voir Figure A) ou sur le thermostat mural (voir Figure B) et, le cas échéant, sur le boîtier de la télé- commande (Figure C). Les mises en garde auraient dû être collées au moment de l’installation initiale du foyer. Si ce n’est pas le cas, prenez les étiquettes adhésives multilingues fournies avec ces instructions et procédez comme suit:

1. Repérez l’interrupteur ou le thermostat mural qui contrôle le foyer (vériﬁez que l’interrupteur contrôle le fonctionnement du foyer en le faisant

basculer de Marche à Arrêt, et vice-versa). Nettoyez

soigneusement la plaque murale de l’interrupteur ou le thermostat mural pour éliminer la poussière et les traces de graisse ou d’huile. Collez l’étiquette sur la surface de la plaque de l’interrupteur mural qui contrôle le foyer (Figure A) ou du thermostat mural (Figure B). Choisissez la langue qui est principalement parlée dans la résidence du propriétaire.

2. Si une télécommande est utilisée pour contrôler le foyer, nettoyez la soigneusement pour éliminer la poussière et les traces de graisse ou d’huile. Collez l’étiquette sur le boîtier de la télécommande (Figure C). Choisissez la langue qui est principale- ment parlée dans la résidence du propriétaire.

3. Si vous ne trouvez pas les étiquettes, veuillez appeler Lennox Hearth Products ou votre distributeur Lennox Hearth Products local pour recevoir gratuitement des étiquettes supplémentaires.

Étiquettes de remplacement, n° cat. H8024

LENNOX HEARTH PRODUCTS 1-800-9-LENNOX

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

COLOCACIÓN DE ADVERTENCIAS DE SEGURIDAD EN OPERACIÓN

Su chimenea incluye etiquetas de instrucciones de seguridad que deben colocarse en el punto de operación y control de la chimenea. Se debe colocar una etiqueta de instrucciones de seguridad en la placa del interruptor de pared desde el cual se enciende y se apaga la chimenea

(ver la Figura A) o en el termostato de pared (ver la Figura B) y en el transmisor de control remoto (Figura C) si

se usa. Las advertencias ya deben haberse colocado cuando se completó la instalación inicial de la chimenea. Si no están colocadas en estos lugares, encuentre las etiquetas adhesivas multilingües proporcionadas con estas instrucciones y prosiga de la siguiente manera:

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

opera la chimenea encendiéndola y apagándola).

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

2. Si se usa un control remoto para controlar la chimenea, encuentre el transmisor y límpielo bien para quitar el polvo y aceite. Pegue la etiqueta en la superﬁcie del transmisor (Figura C). Seleccione el idioma que más se habla en la casa.

3. Si no puede encontrar las etiquetas, sírvase llamar a

Lennox Hearth Products o al distribuidor de Lennox Hearth Products más cercano para recibir etiquetas de instrucciones de seguridad adicionales gratuitas.

Juego de etiquetas de repuesto - Nº de cat. H8024

LENNOX HEARTH PRODUCTS 1-800-9-LENNOX

Nota: La etiqueta en inglés es transparente con texto rojo. Las etiquetas en francés y español son negras con texto blanco.

Figure A

SAFETY LABEL

DIAGRAMS

DIAGRAMMES DES ÉTIQUETTES

DE SÉCURITÉ

Figure B

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

DIAGRAMAS DE ETIQUETAS

DE SEGURIDAD

Figure C

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

INSTALLATION ACCESSORIES

Listed Secure Vent™ Components

Cat. No. Model Description

H1968 SV4.5HT-2 Horizontal Square

94L10 SV4.5HTSS Rigid - Horizontal - Small

H5817 SV4.5-

20SSWSK

H2152 SV4.5CGV-1 Vertical Termination Cap,

H4687 SV4.5CTS Chase Top Termination,

H4716 SV4.5CTS-B Chase Top Termination,

H4717 SV4.5CTS-TC Chase Top Termination,

Termination with Firestop/

Spacer (H2246) & Adaptor (74L61)

Square Termination with

Firestop/Spacer (H2246) & Adaptor (74L61)

(ref. Instruction P/N 750204M)

Rigid - Small, Square

Termination, 20" w/Shield

and Firestop

(ref. Instruction P/N 750247M

and 750204M)

High Wind

Square

(ref. Instruction P/N 750207M)

Square, Black

(ref. Instruction P/N 750207M)

Square, Terra Cotta

(ref. Instruction P/N 750207M)

Cat. No. Model Description

Vent Sections

(Rigid)

The following ﬂashings come packaged with a storm collar:

77L70 SV4.5L6 6 Inch (152 mm) 77L71 SV4.5L12 12 Inch (305 mm) 77L72 SV4.5L24 24 Inch (610 mm)

77L73 SV4.5L36 36 Inch (914 mm) 77L74 SV4.5L48 48 Inch (1219 mm)

77L75 SV4.5LA Telescopic Length Slip

77L76 SV4.5E45 45 Degree Elbow

77L77 SV4.5E90 90 Degree Elbow

77L78 SV4.5F Flat Roof Flashing

77L79 SV4.5FA 1/12 to 7/12 Adjustable

77L80 SV4.5FB 7/12 to 12/12 Adjustable

77L81 SV4.5SC6 Storm Collar (6 per box)

H6183 SV4.5HF5 Firestop Spacer, 5", rigid H6184 SF4.5HF5 H2246 SV4.5HF-10 Firestop/Spacer-Horizontal,

H2247 SV4.5VF-10 Firestop/Spacer-Vertical,

96K92 SV4.5SP Support Plate

Section (2" to 7-1/2" rigid)

Flashing

Firestop Spacer, 5", ﬂex

rigid (3-1-1 spacing),

10-pack

rigid (1-1-1 spacing),

10-pack

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

n t

INSTALLATION ACCESSORIES CONTINUED

Listed Secure Vent™ Components

Cat. # Model Description

17M52 SV4.5HGS-1 Termination Guard, Square

(Fits 94L10 & H1968)

17M53 SV4.5HGS-12 Termination Guard, Hori-

87L02 SV4.5HGS Termination Guard for

(Fits 94L10 & H1968)

H5820 SV4.5HTSK Termination Shroud

(Fits H1968)

H5816

SV4.5-

TWSK10

750,247M

H3907 SV4.5ARSA Attic Insulation Shield w/

96K93 SV4.5SU Support Strap

10K81 SFMP Mill-Pac, Black, High

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

99L02 SV4.5HRK14 Horizontal Riser Kit, 14"

99L03 SV4.5HRK36 Horizontal Riser Kit, 36"

H1988 CTSA-33

H1985 CTSO-33

H1987 CTSO-44

H1986 CTSO-46

Listed Secure Flex™ Components

These termination kits include ﬁrestop/spacer, gear clamps and ﬂex adaptor.

60L10 SF-18 18 feet (5.49 m) *

98K03 SF-12 12 feet (3.66 m) *

H2248 SF4.5HF-10 Firestop/Spacer-Horizontal

H2249 SF4.5VF-10 Firestop/Spacer-Vertical,

(1-pack)

(ref. Instruction P/N 750109M)

zontal Square (12-pack)

(ref. Instruction P/N 750109M)

Horizontal Square Termi-

nation (Deluxe) (1-pack)

(ref. Instruction P/N 750055M)

(Guard) for Horizontal

Square Termination

(1-pack)

(ref. Instruction P/N 750246M)

Through Wall Shield Kit

(used to shield the directvent pipe from blown

insulation)

(ref. Instruction P/N 750247M)

adjustable height, 12"-22"

Temperature Sealant

Temperature Sealant Bulk 12-pack

(ref. Instruction P/N 750146M)

Chase Top Shroud Kit, Arch

Top 3 X 3 Ft.

(ref. Instruction P/N 750194M)

Chase Top Shroud Kit,

Open Top 3 x 3 ft.

(ref. Instruction P/N 750193M)

Chase Top Shroud Kit,

Open Top 4 x 4 ft.

(ref. Instruction P/N 750193M)

Chase Top Shroud Kit,

Open Top 4 x 6 ft.

(ref. Instruction P/N 750193M)

compressed ﬂex

(ref. Instruction P/N 750053M)

compressed ﬂex

(ref. Instruction P/N 750052M)

ﬂex

(3-1-1 spacing)

10-Pack

ﬂex (1-1-1 spacing)

10-Pack

Cat. # Model Description

H1969 SF4.5HT-2 Horizontal Square Termina-

77L87 SFKIT12S Square Term. for ﬂex

77L88 SFKIT18S Square Term. for ﬂex

77L89 SFKIT24S Square Term. for ﬂex

77L90 SFKIT36S Square Term. for ﬂex

77L91 SFKIT48S Square Term. for ﬂex

94L04 SFKIT12SS Small Square Termination

94L05 SFKIT18SS Small Square Termination

94L06 SFKIT24SS Small Square Termination

94L07 SFKIT36SS Small Square Termination

94L08 SFKIT48SS Small Square Termination

94L09 SF-HTSS Horizontal Small Square

56L74 SFVT30 Vertical Termination for

56L75 SFVT45 Vertical Termination for

91L66 SFGC4-6 Gear Clamp 4.5 in. (114

91L67 SFGC7-6 Gear Clamp 7.5 in. (190.5

H7748 FVK36 36"

Flex

*All compressed ﬂex vents can be expanded up to two times.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

tion for ﬂex (without ex)

(with 12 inch [305 mm]* compressed ex)

(with 18 inch [457 mm]* compressed ex)

(with 24 inch [610 mm]* compressed ex)

(with 36 inch [914 mm]* compressed ex)

(with 48 inch [1219 mm]* compressed ex)

for ﬂex, with 12 in. (305 mm) of *compressed ex

vent

(ref. Instr. P/N 750204M)

for ﬂex, with 18 in. (457 mm) of *compressed ex

vent (ref. Instr. P/N 750204M)

for ﬂex, with 24 in. (610

mm) of *compressed ex

vent (ref. Instr. P/N 750204M)

for ﬂex, with 36 in. (914

mm) of *compressed ex

vent (ref. Instr. P/N 750204M)

for ﬂex, with 48 in. (1219

mm) of *compressed ex

vent (ref. Instr. P/N 750204M)

Termination for ﬂex, without ﬂex vent (ref. Instr. P/N 750204M)

ﬂex (at to 6/12) with ex

adaptor, section of rigid vent, roof support collar assembly, roof ﬂashing and storm collar.

(ref. Instruction P/N 750052M)

ﬂex (6/12 to 12/12) with

ﬂex adaptor, section of rigid vent, roof support collar assembly, roof ﬂashing and storm collar.

(ref. Instruction P/N 750052M)

mm) for ﬂex (6-pack)

Flex

Connector Kit

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

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

GAS CONVERSION KITS

WARNING

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

AVERTISSEMENT

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

In Canada: THE CONVERSION SHALL BE CARRIED OUT IN ACCORDANCE WITH THE REQUIREMENTS OF THE PROVINCIAL AUTHORITIES HAVING JURISDICTION AND IN ACCORDANCE WITH THE REQUIREMENTS OF THE CAN/CSA-B149.1 INSTALLATION CODE.

LA CONVERSION DEVRA ÊTRE EFFECTUÉE CONFORMÉMENT AUX RECOMMANDATIONS DES AUTORITÉS PROVINCIALES AYANT JURIDICTION ET CONFORMÉMENT AUX EXIGENCES DU CODE D'INSTALLATION CAN/CSAB149.1.

Gas conversion kits are available to adapt your appliance from the use of one type of gas to the use of another. These kits contain all the necessary components needed to complete the task including labeling that must be afﬁxed to ensure safe operation.

Millivolt SIT Systems

Natural Gas To Propane Gas

Conversion Kits

Models Catalog No. MLDVT-30 H7672 MLDVT-35 H7292 MLDVT-40 H7673 MLDVT-45 H7546

Millivolt SIT Systems

Propane Gas to Natural Gas

Conversion Kits

Models Catalog No. MLDVT-30 H6165 MLDVT-35 H7293 MLDVT-40 H7294 MLDVT-45 85L66

Electronic DEXEN Systems

Natural Gas To Propane Gas

Conversion Kits

Models Catalog No. MLDVT-30 H7668 MLDVT-35 H7295 MLDVT-40 H7669 MLDVT-45 H7544

Electronic DEXEN Systems

Propane Gas To Natural Gas

Conversion Kits

Models Catalog No. MLDVT-30 H6170 MLDVT-35 H7296 MLDVT-40 H7297 MLDVT-45 H7545

INSTALLATION INSTRUCTIONS

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

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

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

Step 2. Remove the front glass door assembly.

See Figure 49 on Page 31.

Step 3. Carefully remove the logs. Take care not to break the logs.

Step 4. Refer to Figure 55 on Page 38.

Remove the burner assembly with attached venturi tube.

Kit part numbers are listed here, and the following steps detail the conversion procedure. Refer to the instructions provided with the conversion kit when performing any gas conversion.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

PILOT

OUT

VENT

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

Step 6. See Figure 57 and remove the pilot

Burner Assembly

hood assembly to access the hexed pilot oriﬁce. Remove and replace the oriﬁce with the one provided with the kit.

Supply Gas Inlet

Pressure-Tap (Manifold)

Regulator Mounting Screw

Gas Valve Assembly

Burner Stage Terminal

Gas

Outlet

To Burner

Orifice

Figure 55

Millivolt Appliances

Step 5. SIT Systems - Refer to Figure 55 and

the instructions provided with the kit. Using

a Torx T20 (with 1/4" shank and center hole),

tool or standard ﬂat screwdriver remove and discard the three pressure regulator mounting screws. Remove the pressure regulator, spring, poppet, diaphragm and bushing. Discard all removed components.

Ensure the rubber gasket installed on the back of the replacement pressure regulator is properly positioned and install the new pressure regulator using the new screws supplied with the kit. Tighten screws to 25 In. lb. torque.

Pilot Oriﬁce

Figure 57

Electronic Appliances

Step 7. Dexen Electronic Valves - See Figure

58 and the instructions provided with the kit. Remove and discard the two pressure regulator mounting screws. Remove the pressure regulator and diaphragm. Discard all removed components. Ensure the provided diaphragm is installed properly onto the replacement pressure regulator and install the new pressure regulator using the new screws supplied with the kit. Tighten screws.

Pressure-Tap (Inlet)

Pilot Gas Outlet

Ground (TP)

Pilot Stage Terminal

Figure 58 - Dexen Electronic Gas Valve

ELECTRONIC

Sensor

Igniter

Pilot Hood

Note: If the igniter is damaged, a replacement kit is available, order Catalog Number 87L54.

Figure 59

Pressure

Regulator

Remove These Components

Figure 56

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 8. See Figure 59 and replace the pilot oriﬁce as follows: Remove pilot hood assembly to access the phillipped pilot oriﬁce. Remove and replace the oriﬁce with the one provided with the kit. Exercise extreme care to prevent

damage to or breakage of the igniter assembly.

All Models Step 9. (Refer to Figure 55 on Page 38 and

Figure 60)

VERIFY THE PROPER ORIFICE SIZE BEFORE INSTALLING IT.

A. Remove the oriﬁce from the manifold and

replace it with the one provided in the kit. See Table 9 for oriﬁce sizes for natural and propane models. Figure 60 illustrates the oriﬁce. Use pipe joint compound or Teﬂon tape on all pipe ﬁttings before installing (ensure propane resistant compounds are used in propane applications, do not use pipe joint compounds

on are ttings).

B. Retrieve the burner and slide the venturi tube over the oriﬁce. Set the shutter adjusting opening as shown in Figure 50, Page 32.

Burner Oriﬁce Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Model

Series

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

Nat.Gas

drill size (inches)

#50 (0.070")*

•

H4873

(0.0748")*

•

H1355

#44 (0.086")*

•

60J80

(0.090")*

•

37L70

Propane

drill size (inches)

#59 (0.041")*

H7838

(0.045")*

75L10

#55 (0.052")*

19L52

#54 (0.055")*

99K79

*Standard size installed at factory.

BURNER ORIFICE

•

Part /Cat. Number.

Table 9

Figure 60

Step 10. Reassemble the remaining components by reversing the procedures outlined in the preceding steps.

Step 11. Attach the conversion label provided in the conversion kit to the rating plate on the

•

appliance.

Step 12. Turn on gas supply and test for gas leaks. See Test All Connections For Gas Leaks on Page 27.

Step 12. Attach manometer to the manifold

•

side pressure test ﬁtting and verify manifold

pressure reads 3.5 inches water column (0.87 kPa) for natural gas, and 10.0 inches water column (2.49 kPa) for propane gas.

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Lennox Hearth Products reserves the right to make changes at any time, without notice, in design, materials, speciﬁcations, prices and also to discontinue colors, styles and products. Consult your local distributor for ﬁreplace code information.

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

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

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

Specifications and Main Features

Frequently Asked Questions

User Manual