Lennox Merit MLDVTCD-35NM, Merit MLDVTCD-35NM-FB, Merit MLDVTCD35NE-2, Merit MLDVTCD-35NE-FB Installation Instructions Manual

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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.

MLDVTCD Direct-Vent Gas Fireplaces

P/N 506015-09 Rev. A 04/2013

This manual is one of a set of two supporting this product. Refer to P/N 506017-08 for Care and Operation Instructions.

Ce manuel est disponible en francais, simplement en faire la demande. Numéro de la pièce 506223-60.

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

MLDVTCD-35NM MLDVTCD-35NM-FB

Report No. 100353019PRT-002

Please read and understand these instructions before starting installation.

ELECTRONIC:MILLIVOLT:

MLDVTCD35NE-2

MLDVTCD-35NE-FB

™

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LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

TABLE OF CONTENTS

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

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

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

Requirements for the Commonwealth

of Massachusetts ...................... 4

Cold Climate Insulation.................. 4

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

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

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

Minimum Clearance to Combustibles ....... 8

Pre-Installation Steps ................... 9

Typical Installation Sequence ............. 9

Detailed Installation Steps................ 9

Optional Blower Kit Wiring ............... 9

Framing.............................. 9

Fireplace and Framing Speciﬁcations ...... 10

Routing Gas Line ..................... 11

Installing the Venting System . . . . . . . . . . . . 12

Vertical Termination Systems ............ 12

Vent Section Length Chart .............. 13

Vertical Vent Tables and Figures .......... 16

Horizontal Termination System........... 18

Horizontal Vent Tables and Figures ........ 20

Venting Using Flexible Vent Pipe.......... 22

Field Wiring.......................... 23

Optional Blower Kit Wiring .............. 24

Connecting Gas Line................... 24

Verifying Appliance Operation............ 25

Installing Logs ....................... 26

Removing/Installing Glass Door .......... 28

Adjusting Burner...................... 28

Installing Hood ....................... 30

Finishing Requirements ................ 30

Attaching Safety-in-Operation Warnings.... 31

Installation Accessories ................ 32

Gas Conversion Kits ................... 34

Please read and understand these instructions before beginning your installation.

PACKAGING

The assembled vented gas ﬁreplace heater is packaged with:

• Literature Kit (Envelope in bottom compartment containing Care and Operation Instructions, Installation Instructions, Safety-In-Operation Warning Labels, Warranty)

• (1) U-Shaped Vent Restrictor (Attached to Literature Kit envelope)

• (1) Hood (Inside ﬁrebox)

• One of the following contemporary ﬂoor media kits (sold separately):

• Tumbled River Stone

• Crushed Glass, Obsidian Black

• Crushed Glass, Diamond White

• Crushed Glass, Deep Sea Blue

• White Beach Sand

• Optional Contemporary facade kits

(sold separately)

INTRODUCTION

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.

Electronic appliances are designed to operate on natural or propane gas. An electronic intermittent pilot ignition system provides safe, efﬁcient operation. External electrical power is required to operate these units. In the event of a power outage, four (4) “AA” batteries (in battery holder) provide backup power for appliance operation (excluding [optional] blower).

These vented gas ﬁreplace heaters are sealed combustion, aircirculating gas ﬁreplaces designed for residential applications.

Approved Vent Components

These ﬁreplaces are designed, tested and listed for operation and installation with the following vent components only:

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

• Secure Flex® Flexible Vent Components manufactured by Security Chimneys International, and

• Z-FLEX® Model GA Venting Systems listed to UL1777 and ULCS635 manufactured by Flexmaster Canada Limited.

Use only the correct size venting (4 1/2 in. inner and 7 1/2 in. outer).

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

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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.

NOTE: Children and adults should be alerted

to the hazards of high surface temperature and should stay away to avoid burns or clothing ignition.

Remarqué : 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.

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LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • 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.

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.

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.

Remarqué : 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.

NOTE: 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.

Remarqué : 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.

NOTE: Only trim kit(s) supplied by the manufacturer shall be used in the installation of this appliance.

Remarqué : Seules les trousses de garniture fournies par le fabricant doivent être utilisées pour l’installation de cet appareil.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Codes and Standards

These appliances comply with National Safety Standards and are tested and listed by ETL/Intertek. (Report No. 100353019PRT-002) to ANSI Z21.50 (in Canada, CSA 2.22), and CAN/ CGA-2.17-M91 in both USA and Canada, as vented gas ﬁreplaces.

Both millivolt and electronic versions of these appliances may be used in bedrooms only when the room is an “unconﬁned space” as deﬁned by the National Fuel Gas Code. Use in bedrooms may not be allowed by your local building codes. You should obtain prior approval from the Authority Having Jurisdiction prior to installation.

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 appliances are designed as decorative ﬁreplaces. 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.

Electronic models come standard with a remotely-modulated gas valve. Flame appearance and heat output cannot be controlled at the gas valve. The BTU Input for these appliances is shown in Table 1.

Table 1: Input Rate, Gas Valves

Models

MLDVTCD-35

Input Rate (BTU/HR)

Natural Gas Propane Gas

14,500 high

11,500 low

13,500 high

10,500 low

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LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Gas Pressure

Table 2 and Table 3 show the appliance inlet and manifold gas pressure requirements.

Table 2: Inlet Gas Supply Pressure

Fuel Minimum Maximum

Natural Gas

Propane

4.5 in. WC (1.12 kPa)

11.0 in. WC (2.74 kPa)

Table 3: Manifold Gas Supply Pressure

Fuel Low High

Natural Gas

Propane

2.2 in. WC (0.55 kPa)

6.3 in. WC (1.57 kPa)

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

Figure 1: SIT Millivolt Gas Valve

Main Gas Control Knob

OFF/PILOT/ON

OUT

Manifold Pressure Tap

Inlet Pressure Tap

Figure 2: SIT Electronic Gas Valve

Green Wire

Inlet (IN) Test Port Manifold (OUT)

Test Port

Orange Wire

(from DFC

Wire

Harness)

Main

Gas Inlet

3/8 in. NPT

(from DFC Wire

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.

10.5 in. WC (2.61 kPa)

13.0 in. WC (3.23 kPa)

3.5 in. WC (0.87 kPa)

10.0 in. WC (2.49 kPa)

Pilot Adjustment

Screw

HI/LO Variable

Flame Height

Adjustment

Hi/Lo Flame

Harness)

Yellow Ground Wire (from DFC Wire Harness)

Control Knob

The appliance and its appliance main gas valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psi (3.5 kPa).

The appliance must be isolated from the gas supply piping system by closing its equipment shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa).

Oriﬁce Sizes—Sea Level to High Altitude

These appliances are tested and approved for installation at elevations of 0–4500 ft (0–1372 m) above sea level using the standard burner oriﬁce sizes (marked with an “*” in Table 4).

For elevations above 4500 ft, 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 oriﬁce to a smaller size as regulated by the local authorities having jurisdiction and by the (USA) National Fuel Gas Code NFPA

HTPTHTPT

54/ANSI Z223.1—latest edition or, in Canada, the CAN/CSA-B149.1 codes— latest edition.

NOTE: Flame breadth, height and width will diminish 4% for every 1,000 feet of altitude.

Table 4: Burner Oriﬁce Sizes, Elevation 0–4500 ft ( 0–1372 m)

Model

MLDVTCD-35

* Standard size installed at factory

• Catalog number

Natural Gas

drill size

(inches)

#49 (0.073 in.)*

21L82•

(0.045 in.)*

In Canada—CAN/CGA-2.17-M91 (high altitude):

THE CONVERSION SHALL BE CARRIED OUT BY A MANUFACTURER’S AUTHORIZED REPRESENTATIVE, IN ACCORDANCE WITH THE REQUIREMENTS OF THE MANUFACTURER, PROVINCIAL OR TERRITORIAL AUTHORITIES HAVING JURISDICTION AND IN ACCORDANCE WITH THE REQUIREMENTS OF THE CAN/CGA-B149.1 OR CAN/CGA-B149.2 INSTALLATION CODES.

REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS

These ﬁreplaces are approved for installation in the U.S. state of

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Propane drill size (inches)

75L10•

Massachusetts if the following additional requirements are met:

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

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

• The ﬂexible gas line connector used shall not exceed 36 in. (92 cm) 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 certiﬁed.

• A metal or plastic identiﬁcation 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.

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 conduction of cold transferring to the ﬁreplace and into the room. It also helps to sheetrock inside surfaces and tape for maximum air tightness and caulk ﬁrestops.

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LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

MANUFACTURED HOME REQUIREMENTS

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

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.

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.

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).

Figure 3: Typical Locations

TNEVPOT

NOITACILPPA

TNEVPOT

NOITACILPPA

TNEVPOT

APPLICATION

TOP VENT

RECESSED

INSTALLATION

NOITACILPPA

TNEVPOT

TOP VENT

APPLICATION

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 Table 8.

The appliance must 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 or other combustible material other than wood ﬂooring, the appliance shall be installed on a metal or wood panel extending the full width and depth of the appliance.

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.

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.

HORIZONTAL VENT

(Top Vent Application)

VERTICAL VENT

(Top Vent Application)

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 locating television sets and decorative plants.

Be aware that this is a heat producing appliance. Objects placed above the unit are exposed to elevated temperatures.

Do not insulate the space between the appliance and the area above it (Table 8).

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LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • 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, Figure 4, Figure 5, and Table 5.

Figure 4: Multiple Terminations

12 in.

(305 mm)

Minimum

Figure 5: Vertical Vent Termination

Clearances

TERMINATION HEIGHTS FOR VENTS ABOVE

Horizontal Overhang

2 FT MIN.

Termination

Storm Collar

Flashing

Concentric

Vent Pipe

FLAT OR SLOPED ROOFS

Vent

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

2 FT MIN.

Lowest

Discharge

Opening

1 inch (25.4 mm) Minimum Clearance to Combustibles

Vertical Wall

Roof Pitch is X/12

Table 5: Termination Heights for Vents above Flat or Sloped Roofs

Roof Pitch Feet * Meters *

Flat to 6 1/2 1 0.3

6 1/2 to 7 1/2 1 1/4 0.38

7 1/2 to 8 1/2 1 1/2 0.46

8 1/2 to 9 1/2 2 0.61

9 1/2 to 10 1/2 2 1/2 0.76 10 1/2 to 11 1/2 3 1/4 0.99 11 1/2 to 12 1/2 4 1.22 12 1/2 to 14 1/2 5 1.52 14 1/2 to 16 1/2 6 1.83 16 1/2 to 18 1/2 7 2.13

18 1/2 to 201/2 7 1/2 2.29

20 1/2 to 21 1/2 8 2.44

Horizontal Vent Termination Clearances

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

Figure 6: Horizontal Vent Termination

Clearances, Side Elevation

Combustible Projection

2-1/2

inches or less in length

Combustible Projection greater

than 2-1/2 inches in length

Ventilated

Soffit

Unventilated

Soffit

18"

(457 mm)

12"

(305 mm)

Figure 7: Horizontal Vent Termination

Clearances

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.

(152 mm)

Termination Kit

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LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Table 6: Exterior Horizontal Vent Termination Clearances

NOTE: Local Codes Or Regulations

See Item D in the Text Below.

Horizontal Termination

Exterior Wall

*18 in.

Inside Corner

6 in.

Ventilated Soffit

Detail D

= Air Supply Inlet

Fixed

Closed

= Vent Termination

Window

Inside

Corner Detail

Operable

Window

= Area where Termination is not Permitted

U.S. Installation ** Canadian Installation *

Clearance above grade, veranda, porch, desk, or balcony 12 in. (300 mm) ** 12 in. (300 mm) *

Clearance to window or door that may be opened 6 in. (150 mm)

for appliances < 10,000 Btuh (3 kW), 9 in. (230 mm)

for appliances > 10,000 Btuh (3 kW), and < 50,000 Btuh (15 kW), 12 in. (300 mm)

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

Clearance to permanently closed window 9 in. (229 mm)

Vertical clearance to ventilated sofﬁt located above the

termination within a horizontal distance of 18 in. (458 mm) Clearance to unventilated sofﬁt 12 in. (305 mm) 12 in. (305 mm)

Clearance to outside corner 5 in. (127 mm)

Clearance to inside corner 2 in. (50.8 mm)

recommended to prevent window condensation

18 in. (458 mm) 18 in. (458 mm)

minimum

minimum—SV4.5HT-2 •

6 in. (152 mm) minimum—SV4.5HTSS

Clearance to each inside of center line extended above

meter / regulator assembly

Clearance to service regulator vent outlet 36 in. (910 mm)** 36 in. (910 mm)*

Clearance to nonmechanical air supply inlet to building or

the combustion air inlet to any other appliance

36 in. (910 mm) within a height of 15 ft above the meter / regulator assembly **

6 in. (150 mm) for appliances < 10,000 Btuh (3 kW),

9 in. (230 mm) for appliances > 10,000 Btuh (3 kW) and < 50,000 Btuh (15 kW),

12 in. (300 mm) for appliances > 50,000 Btuh (15 kW)**

Clearance to a mechanical air supply inlet 36 in. (910 mm) above if within 10 ft (3 m) horizontally ** 72 in. (1830 mm) *

Clearance above paved sidewalk or paved diveway located

on public property Clearance under veranda, porch, deck or balcony 12 in. (300 mm) *‡ 12 in. (300 mm) *‡

Depth of alcove (maximum) 72 in. (1830 mm) ** 72 in. (1830 mm) *

Clearance to termination (alcove) 6 in. (15.2 mm) ** 6 in. (15.2 mm)*

Width of alcove (minimum) 36 in. (910 mm) ** 36 in. (910 mm) *

Clearance to combustible above (alcove) 18 in. (457 mm) ** 18 in. (457 mm) *

In accordance with the current CSA-B149.1 National Gas And Propane Installation Code

In accordance with the curent ANSI SZ223.1/NFPA 54 National Fuel Gas Codes

‡

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

*‡

Only permitted if veranda, porch, deck, or balcony is fully-open on a minimum two sides beneath the ﬂoor

•

2 in. clearance to non-combustibles for SV4.5HT-2 only

84 in. (2130 mm) ‡ 84 in. (2130 mm) ‡

May Require Different Clearances.

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

= 9 in. in U.S.

= 12 in. in Canada

3 ft

6 in. (150 mm) for appliances < 10,000 Btuh (3 kW),

12 in. (300 mm) for appliances > 10,000 Btuh (3 kW)

12 in. (305 mm) recommended to prevent window condensation

5 in. (127 mm) minimum

2 in. (50.8 mm)

minimum—SV4.5HT-2 •

6 in. (152 mm) minimum—SV4.5HTSS

36 in. (910 mm) within a height of 15 ft above the meter / regulator assembly *

6 in. (150 mm) for appliances < 10,000 Btuh (3 kW),

12 in. (300 mm) for appliances > 10,000 Btuh (3 kW)

Page 8

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

mantel legs may

MINIMUM CLEARANCE TO COMBUSTIBLES

The appliance is approved with zero clearance to combustible materials on all sides (Table 7), 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 (Figure 3).

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, use the alternate rear vent outlet, 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 (Table 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 Table 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.

Table 7: Minimum Clearances *

Back

Sides

Top of

Fireplace

Floor From

Bottom

of Unit To

Ceiling

Vent

Front

Service

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

** Note: See Frame the Fireplace on Page 9 for clearance requirements to the nailing ﬂange located at each side of the unit and any screw heads adjacent to it.

0 in. (0 mm) from Spacers or Dimples

0 in. (0 mm) from Spacers or Dimples **

0 in. (0 mm) with standoff(s) in vertical

1 in. (25.4 mm)—Sides and Bottom

1/2 in. (13 mm)

3 in. (76 mm)

position (Figure 10)

0 in. (0 mm)

minimum of 64 in. (1626 mm)

3 in. (76 mm)—Top *

36 in. (914 mm)

Table 8: Shelf Height Minimum Clearances

Do not insulate the space between the

appliance and the

area above it.

Shelf Height

(see table)

Model

MLDVTCD-35 46 1/2 in. (1181 mm) 48 1/4 in. (1226 mm)

Secure Vent Secure Flex

Wall Finishes, Surrounds, and 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 (Figure 35 on Page 30).

Non-combustible materials, such as surrounds and other appliance trim, may be installed on the appliance face, but they must not cover any portion of the removable glass panel or control compartment.

Vertical installation clearances to combustible mantels vary according to the depth of the mantel (Figure 8). 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.

Minimum clearance requirements include any projections such as shelves, window sills, mantels, etc. above the appliance.

NOTE: We recommend the use of high temperature paint (rated 175 °F, or higher) on the underside of the mantel.

Top Vent—with One 90° Elbow

Figure 8: Minimum Mantel Clearances

Mantel

(305)

Depth

inches (millimeters)

Header

(203)

(254)

(152)

(102)

(51)

Top of

Appliance

Hood

18 (457)

16 (406)

14 (356)

12 (305)

10 (254)

8 (203)

Figure 9: Minimum Distance to

Side Wall

At 6 in. minimum side wall clearance, a combustible wall can project to any length.

6 in.

(152 mm)

3 1/2 in.

(89 mm)

Top View of

Fireplace

Combustible Materials Allowed In Shaded Area “Safe Zone”

Combustible Walls shown in dark gray

Combustible project beyond either side of the fireplace opening as long as they are kept within the shaded area illustrated here.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 9

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

PRE-INSTALLATION STEPS

The appliance is shipped with all gas controls and components installed and prewired. Before installing the appliance, follow these steps:

1. Remove the shipping carton.

2. 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.

1. Wire the [Optional] Blower Kit Before Installation in the Framing

2. Frame the Fireplace

3. Route the Gas Line

4. Install the Vent System

5. Field Wiring

6. Wire the [Optional] Blower Kit After Installation in the Framing

7. Connect the Gas Line

8. Verify Proper Appliance Operation

9. Install the Contemporary Media

10. Install the Glass Door

11. Adjust the Burner

12. Install the Hood

13. Attach the Safety-inOperation Warnings

DETAILED INSTALLATION STEPS

Follow these steps to complete ﬁreplace installation:

Wire the [Optional] Blower Kit Before Installation in the Framing

Remove the left side blower cover panel screw, and blower cover panel (Table 11). Retain the panel and screw for later reinstallation.

Slide the blower through the opening and position it with the bracket oriented to the front of the ﬁrebox and the blower discharge to the rear of the ﬁrebox. Bend the two tabs in the ﬁrebox ﬂoor to secure the blower to the ﬂoor.

Reinstall the blower cover panel and secure with the removed screw.

Access the blower supply wiring through the front of the ﬁrebox and plug it into the junction box in the right, rear of the ﬁrebox (Figure 28).

Install the blower control switch according to its included instructions.

Frame the Fireplace

Frame the appliance as illustrated in Table 9 on Page 10. For corner framing installations, use Table 10 on Page 10. All framing details must allow for a minimum clearance to combustible framing members as shown in Table 7 on Page 8.

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

Bend up the outer pair for 1/2 in. materials and the inner pair for 5/8 in. materials.

Headers may be in direct contact with the appliance top standoff spacers when they are bent up vertically, maintaining the 3 in. clearance to the ﬁreplace 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.

Bend out the appropriate nailing ﬂanges for the drywall/ﬁnish material to be used (Figure 10). Nailing ﬂanges are provided for:

• ﬂush framing,

• 1/2 in., and

• 5/8 in. framing depths.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Secure the ﬁreplace to the side framing members using the unit’s nailing ﬂanges —one top and bottom on each side of the ﬁreplace front (Figure 10). Use 8d nails or their equivalent.

Page 10

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Framing should be constructed

Inches (mm)

Table 9: Fireplace Framing Speciﬁcations

Model

MLDVTCD-35

Based on CSA P.4.1-09

mm 895 895 984 406

Note: Diagrams, illustrations and photographs are not to scale. Consult installation

instructions. Product designs, materials, dimensions, speciﬁcations, colors, and prices are subject to change or discontinuation without notice.

A B C D

in. 35 1/4 35 1/4 38 3/4 16

VENT FRAMINGTOP VENT WITH ONE 90° ELBOW

1/2

of 2x4 or larger lumber

10-1/2

)

267

(

(178)

5-1/8 (130)

12-1/8

(308)

Add Minimum Of 6 in. For Raised Platform If Installing With Contemporary Facade.

Table 10: Fireplace Framing Speciﬁcations—Corner Installation with Horizontal Termination

Model

MLDVTCD-35

A B C D E

in. 35 1/4 57 1/2 40 5/8 28 3/4 13 3/4

mm 895 1461 1032 730 349

Back wall of chase/enclosure

(including any finishing materials)

Raised Platform Or Floor

D is the required framing depth dimension when the

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

7 (178)

Inches

(millimeters)

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 11

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Header Spacing Top Standoffs

(two pairs on front edge of firebox top)

Table 11: Fireplace Speciﬁcations

1/2 (13)

Top View

Model E F G H J K L M

MLDVTCD-35

*CONCENTRIC FLUE

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

7 1/2 (190)

9 1/4 (235)

in. 32 1/4 28 1/8 23 1/4 32 35 1/4 25 12 1/2 33

mm 819 714 590 813 895 635 317 838

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

ELECTRICAL INLET KNOCKOUT - 2-3/4 X 2

Front View

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

GAS INLET

KNOCKOUT

(Either Side)

INLET KNOCKOUT,

REQUIRING A FIELD

JUNCTION BOX

OPTIONAL

ELECTRICAL

PROVIDED

(Either Side)

3 (76)

EYEBROW HOOD

16 (406)

5 7/8 (149)

Right Side View

9 1/2 (241)

1 5/8

3 (76)

(42)

5.125

(130.2)

0.5 (12.7)

BLOWER ACCESS PANEL

0.525 (13.3)

Left Side View

Table 12: Thermal Efﬁciency (%)

Model

MLDVTCD-35 — 48 — 51

Natural Gas Propane

AFUE P4 AFUE P4

Figure 10: Unit Secured to Framing by

Nailing Flange

NOTE: Bend up the appropriate header spacing top standoffs before installing the ﬁreplace.

Lift up outer pair for 1/2 in. finish materials

Side

Framing

Lift up inner pair for 5/8 in. finish materials

Unit Nailing

(No clearance to

combustible framing

is required)

Flange

NOTE: The nailing ﬂanges, combustible members, and screw heads in areas directly adjacent to the nailing ﬂanges are EXEMPT from the 1/2 in. (13 mm) 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 in. (13 mm) 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 in this manual.

Vertical Venting through the Ceiling

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 in. (267 x 267 mm) inside dimensions, about this center mark (Figure 14).

Route the Gas Line

Route a 1/2 in. (13 mm) gas line to the left side of the appliance as shown in Figure 11. Gas lines must be routed, constructed, and made of materials that are in strict accordance with local codes and regulations. All appliances are factoryequipped with a ﬂexible gas line connector and 1/2 in. shutoff valve. (see Connect the

Gas Line on Page 24).

Figure 11: Route the Gas Line

Left Side Front

Corner of Fireplace

Framing

Pipe Coupling

(Recommended)

6-1/2"

(152 mm)

(76 mm)

Also see Table 11.

Properly size and route the gas supply line from the supply regulator to the area where the appliance is to be installed per requirements outlined in the National Fuel Gas Code, NFPA 54—latest edition (USA) or CAN/CSA-B149.1—latest edition (Canada).

Never use galvanized or plastic pipe. Refer to Table 13 for proper sizing of the gas supply line, if black iron pipe is being used. Gas lines must be routed, constructed and made of materials that are in strict accordance with local codes and regulations. We recommend that a qualiﬁed individual such as a plumber or gas ﬁtter be hired to correctly size and route the gas supply line to the appliance. Installing a gas supply line from the fuel supply to the appliance involves numerous considerations of materials, protection, sizing, locations, controls, pressure, sediment, and more. Certainly no one unfamiliar and unqualiﬁed should attempt sizing or installing gas piping.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 12

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

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 MPD35/40/45

and MPDT33 series models.

If needed, install the restrictor orientated as

shown, either from inside or outside the unit,

in the inner fireplace collar.

Table 13: Schedule 40 Black Iron Pipe— Inside Diameter

Schedule 40

Pipe Length

(feet)

0–10 1/2 in. 3/8 in.

10–40 1/2 in. 1/2 in.

40–100 1/2 in. 1/2 in.

100–150 3/4 in. 1/2 in. 150–200 3/4 in. 1/2 in.

Natural

Gas

NOTE:

• All appliances are factory-equipped with a ﬂexible gas line connector and 1/2 in. shutoff valve (Figure 29).

• See Massachusetts Horizontal Vent 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 Connect the Gas Line on Page 24.

• A pipe joint compound rated for gas should be used on the threaded joints. Ensure propane resistant compounds are used in propane applications. Be very careful that the pipe compound does not get inside the pipe.

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

• Check with local building ofﬁcial for local code requirements.

NOTE: 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.

Propane

Gas

Install the Vent System

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

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

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

Use only approved vent components (Page 2).

NOTE: 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 separate 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, install vent restrictor (provided) in the appliance top ﬂue outlet as shown in Figure 12. It is held in place by friction, only.

NOTE: The vent restrictor is included in the ﬁrebox.

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 Page 32.

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

Figure 12: Vent restrictor installation—

Top vent

U-SHAPED VENT RESTRICTOR

INNER

FIREPLACE

COLLAR

APPLIANCE TOP

VENT OUTLET

Vertical Termination Systems

See Figure 13, Figure 20, Table 17, and Table 18 on Page 16 that 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 speciﬁed in ANSI Z223.1 (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 (Figure 6 on Page 6).

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 13

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Vertical (Straight) Installation

Determine the number of straight vent sections required:

• 4 1/2 in. (114 mm),

• 10 1/2 in. (267 mm),

• 22 1/2 in. (572 mm),

• 34 1/2 in. (876 mm), and

• 46 1/2 in. (1181 mm)

net section lengths are available (Table 14 and Installation Accessories on Page 32). Plan the vent lengths so that a joint does not occur at the intersection of ceiling or roof joists (Table 14).

Figure 13: Vertical (Straight) Installation

SV4.5CGV-1

Termination

Max. 40 ft (12.2 m)

Table 14: Vent Section Length

Nominal

Section Length

(in.)

Net Section Length (in.)

Height of Vent

in. ft

4.5 0.375 1 0 0 0 0 1

9 0.75 2 0 0 0 0 2

10.5 0.875 0 1 0 0 0 1

15 1.25 1 1 0 0 0 2

19.5 1.625 2 1 0 0 0 3

21 1.75 0 2 0 0 0 2

22.5 1.875 0 0 1 0 0 1

25.5 2.125 1 2 0 0 0 3

31.5 2.625 0 3 0 0 0 3

6 12 24 36 48

4.5 10.5 22.5 34.5 46.5

SV4.5FA or SV4.5FB Flashing AND SV4.5SC Storm Collar

1 in (25.4 mm) Minimum Clearance to Combustibles

SV4.5VF Firestop/Spacer*

*When using Secure Flex, use Firestop/Spacer

SF4.5VF.

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

Number of Vent Sections

Table 14: Vent Section Length

Nominal

Section Length

(in.)

Net Section Length (in.)

Height of Vent

in. ft

34.5 2.875 0 0 0 1 0 1

37.5 3.125 1 1 1 0 0 3

43.5 3.625 0 2 1 0 0 3

45 3.75 0 0 2 0 0 2

46.5 3.875 0 0 0 0 1 1

49.5 4.125 1 0 2 0 0 3

51 4.25 1 0 0 0 1 2

55.5 4.625 0 1 2 0 0 3

57 4.75 0 0 1 1 0 2

66 5.25 0 2 2 0 0 4

67.5 5.625 0 0 3 0 0 3

69 5.75 0 0 0 2 0 2

72 6 1 0 3 0 0 4

73.5 6.125 1 0 0 2 0 3

79.5 6.625 0 1 0 2 0 3

81 6.75 0 0 0 1 1 2

90 7.5 0 2 1 0 1 4

91.5 7.625 0 0 2 0 1 3

93 7.75 0 0 0 0 2 2

96 8 1 0 1 2 0 4

97.5 8.125 1 0 0 0 2 3

102 8.5 2 0 0 0 2 4

103.5 8.625 0 0 0 3 0 3

108 9 1 0 0 3 0 4

114 9.5 0 2 0 0 2 4

117 9.75 1 0 5 0 0 6

118.5 9.875 1 1 0 3 0 5

126 10.5 0 0 1 3 0 4

130.5 10.875 1 0 1 3 0 5

135 11.25 0 0 6 0 0 6

138 11.5 0 0 0 4 0 4

139.5 11.625 0 0 0 0 3 3

142.5 11.875 1 0 0 4 0 5

144 12 1 0 0 0 3 4

150 12.5 0 1 0 0 3 4

154.5 12.875 1 1 0 0 3 5

160.5 13.375 0 2 0 0 3 5

172.5 14.375 0 0 0 5 0 5

Total Qty

177 14.75 1 0 0 5 0 6

183 15.25 0 1 0 5 0 6

186 15.5 0 0 0 0 4 4

190.5 15.875 1 0 0 0 4 5

196.5 16.375 0 1 0 0 4 5

205.5 17.125 0 1 1 5 0 7

207 17.25 0 0 0 6 0 6

211.5 17.625 1 0 0 6 0 7

217.5 18.125 0 1 0 6 0 7

229.5 19.125 0 0 1 6 0 7

232.5 19.375 0 0 0 0 5 5

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

6 12 24 36 48

4.5 10.5 22.5 34.5 46.5

Number of Vent Sections

Table 14: Vent Section Length

Nominal

Section Length

(in.)

Net Section Length (in.)

Total Qty

Height of Vent

in. ft

237 19.75 1 0 0 0 5 6

241.5 20.125 0 0 0 7 0 7

246 20.5 1 0 0 7 0 8

252 21 0 1 0 7 0 8

264 22 0 0 1 7 0 8

276 23 0 0 0 8 0 8

279 23.25 0 0 0 0 6 6

280.5 23.375 1 0 0 8 0 9

283.5 23.625 1 0 0 0 6 7

289.5 24.125 0 1 0 0 6 7

301.5 25.125 0 0 1 0 6 7

310.5 25.875 0 0 0 9 0 9

315 26.5 1 0 0 9 0 10

325.5 27.125 0 0 0 0 7 7

330 27.5 1 0 0 0 7 8

336 28 0 1 0 0 7 8

345 28.75 0 0 0 10 0 10

349.5 29.125 1 0 0 10 0 11

372 31 0 0 0 0 8 8

376.5 31.375 1 0 0 0 8 9

379.5 31.625 0 0 0 11 0 11

418.5 34.875 0 0 0 0 9 9

423 35.25 1 0 0 0 9 10

465 38.75 0 0 0 0 10 10

6 12 24 36 48

4.5 10.5 22.5 34.5 46.5

Number of Vent Sections

Table 15: Effective Vent Length

Model Effective Length

SV4.5L6 4 1/2 in. SV4.5L12 10 1/2 in. SV4.5L24 22 1/2 in.

SV4.5L36 34 1/2 in. SV4.5L48 46 1/2 in.

Total Qty

Page 14

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Vertical (Offset) Installation

Analyze the vent routing and determine the quantities of vent sections and number of elbows required. Refer to Table 14 to select the type of vertical installation desired. Vent sections are available in net lengths of

• 4 1/2 in. (114 mm),

• 10 1/2 in. (267 mm),

• 22 1/2 in. (572 mm),

• 34 1/2 in. (876 mm), and

• 46 1/2 in. (1181 mm).

Refer to Table 14 for an aid in selecting length combinations. Elbows are available in 90° and 45° conﬁgurations. Refer to Figure 17 for the SV4.5E45 and SV4.5E90 elbow dimensional speciﬁcations.

Where required, a telescopic vent section (SV4.5LA) may be used to provide the installer with an option of 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 in. (38 mm) to 7 1/2 in. (191 mm). The SV4.5LA is ﬁtted 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 (3) screws.

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

1. 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 in. (267 x 267 mm) inside dimensions, about this center mark (Figure 14).

Figure 14: Framing Ceiling Opening

Min. 10 1/2 in. (267 mm)

2. Attach vent components to appliance—Secure Vent® SV4.5

direct vent system components are unitized concentric pipe components

featuring positive twist lock connections

(Figure 15).

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.

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 (Figure 15).

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 in. screw may be used at the joint, but it 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 a vent section.

3. 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 (Figure 15).

4. Install ﬁrestop/spacer at ceiling— When using Secure Vent, use SV4.5VF ﬁrestop/spacer at ceiling joists; when using Secure Flex®, use SF4.5VF ﬁrestop/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.

Maintain 1 in. (25 mm) clearance to combustibles, framing members,

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

and attic or ceiling insulation when running vertical chimney sections. Attic insulation shield (H3907) may be used to obtain the required clearances indicated here (Installation Accessories on Page 32). The gap between the vent pipe and a vertical ﬁrestop can be sealed with non-combustible caulking.

5. Support the vertical vent run sections—Support the vertical portion of

the venting system every 8 ft (2.4 m) above the ﬁreplace vent outlet. 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 in. length may be used to secure the support straps to the vent pipe(Figure 16).

NOTE: Proper venting support is very important. The weight of the vent must not be supported by the ﬁreplace.

Figure 15: Twist Lock Vent Pipes

Align the dimple (four places) of the upper vent section with

the opening of the locking

incline channel on the lower vent

section or appliance collar. Twist

vent component clockwise to

engage and seal until arrow and

Arrow

Dimple

Appliance Collar or

Vent Section

dimple align.

Locking

Incline

Channel

Connected Vent

Sections

Arrow

Figure 16: Supporting the Vertical

Vent Run

Blocking

Support Straps (Plumber's tape)

8 feet (2.4 m)

Maximum

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

Page 15

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Storm Collar

SV4.5E90

(90

Elbow)

8 1/8 in.

(206 mm)

Swivel Joint

(360

swivel)

4 13/16 in.

(122 mm)

SV4.5E45

(45

Elbow)

Swivel Joint

(360

swivel)

6. Change vent direction to horizontal/ inclined run—At transition from or

to a horizontal/inclined run, install the SV4.5E45 and SV4.5E90 elbows in the same manner as the straight vent sections. The elbows feature a twist section to allow them to be routed about the center axis of their initial collar section to align with the required direction of the next vent run element. Twist elbow sections in a clockwise direction only so as to avoid the possiblity of unlocking any of the previously connected vent sections (Figure 15).

Figure 17: Vent Elbows

7. Continue installation of horizontal/ inclined sections—Continue with the

installation of the straight vent sections in horizontal/inclined run as described on Page 14. Install support straps every 5 ft (1.52 m) along horizontal/ inclined vent runs using conventional plumber’s tape.

It is very important that the horizontal/ inclined run be maintained in a straight (no dips), slightly elevated plane. The recommended incline is approximately 1/4 in. per foot (20 mm per meter) horizontal, in a direction away from the ﬁreplace. Rise per foot run ratios that are smaller are acceptable all the way down to at or near level. Use a carpenter’s level to measure from a constant surface and adjust the support straps as necessary.

It is important to maintain the required clearances to combustibles:

• 1 in. (25 mm) at all sides for all

vertical runs; and

• 3 in. (76 mm) at the top,

• 1 in. (25 mm) at sides, and

• 1 in. (25 mm) at the bottom for all

horizontal/inclined runs.

8. Frame roof opening—Identify location for vent at the roof. Cut and/or frame opening (Table 16).

Table 16: Framing Dimensions for Roof

Pitch C D

0/12

6/12

12/12

10 1/2 in.

(267 mm)

10 1/2 in.

(267 mm)

10 1/2 in.

(267 mm)

10 1/2 in.

(267 mm)

12 in.

(305 mm)

17 3/4 in.

(451 mm)

9. 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 18 ). 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.

Figure 18: Installing the Roof Flashing

and Storm Collar

10. Install the storm collar—Install the

storm collar, supplied with the ﬂashing, over the vent/ﬂashing joint (Figure 18). 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.

11. 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 Vertical Vent Termination Clearances on Page 6. The SV4.5CGV-1 vertical termination (Figure 19) installs 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

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 19: SV4.5CGV-1 Vertical

Termination

NOTE: If the vent system extends more than 5 ft (1.5 m) above the roof ﬂashing, 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.

Page 16

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Vertical Vent Tables and Figures

NOTE: Secure Vent® rigid vent pipe is shown in the ﬁgures. Secure Flex® ﬂexible vent pipe may also be used.

NOTE: It is very important that the horizontal/inclined run be maintained in a straight (no dips), slightly elevated plane. The recommended incline is approximately 1/4 in. per foot (20 mm per meter) horizontal, in a direction away from the ﬁreplace. The rise per foot run ratios that are smaller are acceptable all the way down to at or near level.

NOTE: SV4.5VF (Secure Vent), SF4.5VF (Secure Flex) ﬁrestop/spacer must be used anytime vent pipe passes through a combustible ﬂoor or ceiling. SV4.5HF (Secure Vent), SF4.5HF (Secure Flex) ﬁrestop/spacer must be used anytime vent pipe passes through a combustible wall.

NOTE: Two 45° elbows may be used in place of one 90° elbow. The same rise to run ratios, as shown in the venting ﬁgures for 90°, must be followed if 45° elbows are used.

NOTE: An elbow is acceptable as 1 foot of vertical rise, except where an elbow is the only vertical component in the system (Table 20).

Figure 20: Top Vent—Straight

Table 17: Top Vent—Two 90° Elbows

Ceiling Firestop/Spacer SV4.5VF*

Wall Firestop/Spacer

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

H Maximum V Maximum

feet meters feet meters

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 + V1 + H = 40 ft (12.2 m) maximum H = 20 ft (6.096 m) maximum Install the U-shaped vent restrictor in any vent run

with more than 8 ft of vertical rise (Figure 12).

SV4.5HF**

u Ceiling Firestop /

Spacer (SV4.5VF)

When using

Secure Flex, use

Firestop / Spacer

SF4.5VF

A Vent Restrictor (Figure 12) must

be used in this

application

A Vent Restrictor (Figure 12) must be used in this application.

40 ft (12.2 m)

Maximum

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

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

An elbow is acceptable as 1 ft of vertical rise except where an elbow is the only vertical component in the system (Table 20).

WARNING

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

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 17

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Table 18: Top Vent—Three Elbows

H + H1 Maximum V Minimum

feet meters feet meters

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 ft (6.1 m) maximum V + V1 + H + H1 = 40 ft (12.2 m) maximum

Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (Figure 12).

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

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

An elbow is acceptable as 1 ft of vertical rise except where an elbow is the only vertical component in the system (Table 20).

Ceiling

Firestop/Spacer SV4.5VF*

Wall Firestop/Spacer SV4.5HF**

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 18

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Horizontal Termination System

Figure 21, and Table 20 to Table 23 on Page 20 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 3 on Page 5 for location guidelines.

Secure Vent SV4.5 direct vent system components are unitized concentric pipe components featuring positive twist lock connection (Figure 15). 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.

1. Plan the vent run—Analyze the vent routing and determine the types and quantities of sections required:

• 4 1/2 in. (114 mm),

• 10 1/2 in. (267 mm),

• 22 1/2 in. (572 mm),

• 34 1/2 in. (876 mm), and

• 46 1/2 in. (1181 mm)

net section lengths are available. It is recommended that you plan the venting so that a joint does not occur in the ceiling or roof joists. Allow for elbows as indicated in (Figure 17).

Maintain a minimum 1 in. (25 mm) clearance to combustibles on the vertical sections. Clearances for the horizontal runs are:

• 3 in. (76 mm) on top,

• 1 in. (25 mm) on sides, and

• 1 in. (25 mm) at the bottom.

2. Frame exterior wall opening—

Locate the center of the vent outlet on the exterior wall according to the dimensions shown in Table 9 on Page 10. Cut and/or frame an opening, 10 1/2 x 12 1/8 in. (267 x 308 mm) inside dimensions, about this center.

3. 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 in. (267 x 267 mm) inside dimensions, about this center (Figure 14).

4. 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 (Figure 15).

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 are seated 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.

5. Attach vent components to each other—Other vent sections may be

added to the previously installed section in accordance with the requirements of the vent tables. To add another vent component to a length of vent run, align the dimpled end of the component over the inclined channel end of the previously installed section, adjusting the radial alignment until the four locking dimples are aligned with the inlets of the four incline channels of the previous section. Push the vent component against the previous section until it fully engages, then twist the component clockwise running the dimples down and along the incline channels until they seat at the end of the channels.This seating position is indicated by the alignment of the arrow and dimple as shown in (Figure 15).

6. Install ﬁrestop/spacer at ceiling—

When using Secure Vent, use SV4.5VF ﬁrestop/spacer at ceiling joists; when using Secure Flex, use SF4.5VF ﬁrestop/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.

NOTE: Maintain 1 in. (25 mm) clearance to combustibles, framing members, and attic or ceiling insulation when running vertical chimney sections.

7. Support the vertical run sections—On the vertical run, support the venting system every 8 ft (2.4 m) above the ﬁreplace vent outlet with ﬁeld provided support straps (Plumber’s tape). Attach the straps to the vent pipe and secure to the framing members with nails or screws (Figure 16).

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

8. Change vent direction—At transition

from or to a horizontal/inclined run, install the SV4.5E45 and SV4.5E90 elbows in the same manner as the straight vent sections. The elbows feature a twist section to allow them to be routed about the center axis of their initial collar section to align with the required direction of the next vent run element. Twist elbow sections in a clockwise direction only so as to avoid the possiblity of unlocking any of the previously connected vent sections (Figure 17).

9. Continue installation of horizontal/ inclined sections—Continue with the

installation of the straight vent sections in horizontal/inclined run as described in Step 5. Install support straps every 5 ft. (1.52 m) along horizontal/ inclined vent runs using conventional plumber’s tape (Figure 21). It is very important that the horizontal/inclined run be maintained in a straight (no dips), slightly elevated plane. The recommended incline is approximately 1/4 in. per foot (20 mm per meter) horizontal, in a direction away from the ﬁreplace. Rise per foot run ratios are acceptable to at or near level. Use a carpenter’s level to measure from a constant surface and adjust the support straps as necessary.

It is important to maintain the required clearances to combustibles:

• 1 in. (25 mm) on all sides for all

vertical runs; and

• 3 in. (76 mm) at the top,

• 1 in. (25 mm) on sides, and

• 1 in. (25 mm) at the bottom for all

horizontal/inclined runs.

10. 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 2. Assemble the vent system to point where the terminus of the last section is within 7 in. (178 mm) to 11 1/4 in. (286 mm) inboard of the exterior surface to which the SV4.5HT termination is to be attached (Figure 23). 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 23, refer to Table 19 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.

Page 19

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

TYPICAL HORIZONTAL VENT INSTALLATION

SV4.5HT-2

Termination

10-1/2 in.

(267mm)

7 in.

(178)

5 1/8 in.

(130 mm)

12 1/8 in. (308 mm)

Note: Centerline of Vent Piping is

NOT the Same as the Centerline of

the Framed Opening.

6 to 48 in. Vent Section,

Telescopic vent section,

Elbow or Appliance Collar

Min. Distance to Base

of Appliance.

Base of Appliance

3 in.

(76 mm)

1 in.

(25.4 mm)

Adapter

SV4.5RCH

To help minimize water

infiltration it is recommended that

the Firestop/Spacer (SV4.5HF)

be installed on the exterior

side of the wall.

Siding

Stucco

1 1/4 in. Maximum recess of the Square Termination into Exterior Finishing Material

Exterior Surface of

Framing

6 in. to 9 1/4 in.

(152 to 235 mm)**

Exterior Surface of Siding

Interior Surface of

Finished Wall

Maximum wall thickness

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

SV4.5HT-2

Square Termination

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

Last Vent Section. Use Telescopic Vent Section (SV4.5LA), If Necessary

Adapter

SV4.5RCH

SV4.5HT-2

Square Termination

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

** For thicknesses greater than 9 1/4 in., see Venting

Components Required for Various Exterior Wall Thicknesses, when using Typical Termination Kits

*Caulk

11. 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 23 in the same manner as any SV4.5 vent component (Step 5).

12. Install Firestop/Spacer at exterior wall—When using the square

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 in. spacer clearance at the top (Figure 22), and nail into place. The ﬁrestop/spacer may also be installed over the opening at the interior side of the framing.

13. Install the desired termination a. SV4.5HT-2 or SV4.5HTSS Square

termination—For the last step,

from outside the exterior wall, slide the collars of the termination onto the adaptor (the outer over the outer and the inner inside the inner) until the termination seats against the exterior wall surface to which it will be attached. Orient the housing of the termination with the arrow pointed upwards. Secure the termination to the exterior wall. The horizontal termination must not be recessed into the exterior wall or siding by more than the 1 1/4 in. (32 mm) as shown in Figure 23.

b. SVHRK Snorkel Cap—The snorkel

cap is designed to be ﬁtted into a basement window box. The SVHRK cap is for use with ﬂex vent. The vertical distance between the inlet and outlet of the cap is 28 in. (711 mm).

Figure 21: Typical Horizontal Vent Installation

Building

Support

Framing

SV4.5E90

ertical

Rise

Support

Brackets

Elbow

Ceiling

Firestop/Spacer

Horizontal / Inclined Run

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

Vent Sections

Support bracket spacing every 5 ft (1.52 m)

Vertical Vent

Fireplace

Figure 22: Installing the Square Horizontal Termination

SV4.5HT-2 Termination

Exterior Wall

SV4.5HT-2 Termination

Exterior Wall

NOTE: The vent termination is hot while in operation and for a period of time following the use of the ﬁreplace. To prevent contact with hot surfaces, use a termination guard (Page 32). This can be purchased at your local dealer.

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.

Figure 23: Venting Connection and Exterior Wall Recessing of the Horizontal

Square Termination (SV4.5HT-2)

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 20

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Horizontal Vent Tables and Figures

NOTE: 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.

NOTE: Two 45° elbows may be used in place of one 90° elbow. The same rise to run ratios, as shown in the venting ﬁgures for 90° elbows, must be followed if 45° elbows are used.

NOTE: It is very important that the horizontal/inclined run be maintained in a straight (no dips), slightly elevated plane. The recommended incline is approximately 1/4 in. per foot (20 mm per meter) horizontal, in a direction away from the ﬁreplace. Rise per foot run ratios are acceptable to at or near level.

Table 20: Top Vent—One 90° Elbow, Elbow Connection at Appliance

**When using Secure Flex, use Wall Firestop/ Spacer SF4.5HF.

H Maximum V Minimum

feet meters feet meters

3 0.914 Elbow Only

Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (Figure 12).

Square termination (SV4.5HT-2) shown. See Table 19 as an aid in venting component selection for a particular range of exterior wall thicknesses.

Wall Firestop/ Spacer SV4.5HF**

WARNING

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

Table 19: Venting Components Required for Various Exterior Wall Thicknesses, when using Typical Termination Kits

Vent Components

Required

Termination Kit Only

Termination Kit and 6 in.

Vent Section (SV4.5L6)

Termination Kit and 12 in.

Vent Section (SV4.5L12)

Termination Kit and

Telescopic Section

(SV4.5L12)

Exterior Wall Thickness

6–9 1/4 in.

(152–235 mm)

10 3/4–14 in.

(2733–356 mm)

16 3/4–20 in.

(426–508 mm)

11 3/4–20 in.

(299–508 mm)

Table 21: Top Vent—One 90° Elbow, Elbow Connection NOT at Appliance

Ceiling

Wall Firestop/ Spacer SV4.5HF**

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

H Maximum V Minimum

feet meters feet meters

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 = 40 ft (12.2 m) maximum H = 20 ft (6.096 m) maximum

Firestop/

Spacer

SV4.5VF*

Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (Figure 12).

Square termination (SV4.5HT-2) shown. If 20 ft of (H) horizontal vent run is needed, then 4 ft minimum of (V) vertical vent will be required. This table shows a 1 (V) to 5 (H) ratio. For every 1 ft of (V) vertical, you are allowed 5 ft of (H) horizontal run, up to a

maximum horizontal run of 20 ft.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 21

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Table 22: Top Vent—Two 90° Elbows

H + H1 Maximum V Minimum

feet meters feet meters

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 = 40 ft (12.2 m) maximum H + H1 = 20 ft (6.096 m) maximum

Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (Figure 12).

Square termination (SV4.5HT-2) shown. See Table 19 as an aid in venting component selection for a particular range of

exterior wall thicknesses.

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

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

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system (Table 20).

Wall Firestop/Spacer

SV4.5HF**

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Wall Firestop/Spacer

SV4.5HF**

Ceiling Firestop/Spacer

SV4.5VF*

Table 23: Top Vent—Three 90° Elbows

H Maximum V Minimum

feet meters feet meters

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 ft (6.096 m) maximum V + V1 +H + H1 = 40 ft (12.2 m) maximum

Install the U-shaped vent restrictor in any vent run with more than 8 ft of vertical rise (Figure 12).

Square termination (SV4.5HT-2) shown. See Table 19 as an aid in venting component selection for a particular range of

exterior wall thicknesses.

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

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

An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system (Table 20).

Wall Firestop/Spacer SV4.5HF**

*When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF.

**When using Secure Flex, use Wall Firestop/Spacer SF4.5HF.

Ceiling Firestop/Spacer SV4.5VF*

Wall Firestop/Spacer SV4.5HF**

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 22

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

5 in. (127 mm)

Radius Minimum

Flexible Vent Section

GEAR CLAMPS

Adaptor

(SV4.5RF)

Apply ONLY MIL-PAC BLACK HIGH TEMPERATURE SEALANT (Catalog 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.

NOTE: OUTER PIPE IS PULLED AWAY TO SHOW THE DETAIL OF THE INNER PIPE

FLEX VENT

1-3/4 in. (44 mm) Flexible Pipe and

Adaptor Outer Collar Overlap

1-3/4 in. (44 mm)

Flexible Pipe and

Adaptor Inner Collar Overlap

SECURING SCREW

(3 PLACES EQUALLY SPACED

JUST BELOW GEAR CLAMP)

Attach Adaptor to Appliance

Collar, or Secure Vent Sections

SECURING SCREW

(3 PLACES EQUALLY SPACED

JUST BELOW GEAR CLAMP)

Venting Using Flexible Vent Pipe

Secure Flex® venting kits and components may be used in any venting application where rigid Secure Vent® (SV4.5) direct vent components can be used. 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. 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 included adaptor that can be ﬁtted to the appliance collar or 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 (Figure 24):

1. Install the Inner Flex Pipe a. Install the small gear clamp loosely

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

b. Apply a bead of Mill-Pac Black

(700 °F) high temperature sealant (P/N 10K81) to the inner adaptor collar, approximately 1/2 in. from the end.

c. Pull and extend the inner ﬂexible

vent pipe.

d. Slide the inner ﬂex pipe over the

adaptor collar. Ensure the ﬂexible vent pipe completely engages the adaptor collar to a distance of 1 3/4 in. from the end, and that it is free from damage or tears.

e. Slide the gear clamp down and

tighten it fully to secure the ﬂexible vent to the adaptor inner collar approximately 3/4 in. from the end of the ﬂex.

f. Install three screws 120° apart

through the ﬂexible vent pipe and into the adaptor collar just below the gear clamp to provide additional security to the connection.

Figure 24: Attaching the Flexible Vent

2. Install the Outer Flex Pipe a. Install the large gear clamp loosely

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

b. Apply a bead of Mill-Pac Black

(700 °F) high temperature sealant (P/N 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 in. from the end.

c. Pull and extend the outer ﬂexible

vent pipe.

d. Slide the outer ﬂex pipe over the

adaptor collar. Ensure the ﬂexible vent pipe completely engages the adaptor collar to a distance of 1 3/4 in. from the end, and that it is free from damage or tears.

e. Slide the gear clamp down and

tighten it fully to secure the ﬂexible vent to the adaptor outer collar approximately 3/4 in. from the end of the ﬂex.

f. Install three (3) screws 120° apart

through the ﬂexible vent pipe and into the adaptor collar just below the gear clamp to provide additional security to the connection.

3. Route Flex Vent a. Ensure the ﬂex vent is properly

routed to provide the required clearance. Do not allow the ﬂexible vent to bend in a radius tighter than 5 in. (127 mm) (Figure 25). Place the internal ﬂex vent spacers evenly and avoid kinking the inner pipe. Support horizontal sections of ﬂex vent with metal straps at 24 in. (610 mm) intervals.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

4. Install Firestop/Spacers at ceilings and walls a. When Secure Flex penetrates a

wall or ceiling, a ﬁrestop/spacer is required. Use the SF4.5 VF ﬁrestop/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.

5. Attach Flex Vent to Termination a. 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 (Figure 24) 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 circumference 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.

Figure 25: Bending the Flexible Vent

Page 23

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

JUNCTION BOX

Field Wiring

CAUTION

The ground supply lead must be connected to the wire attached to the green ground screw located on the outlet box (see wiring diagrams). 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.

The gas valve is set in place and prewired at the factory for both millivolt and electronic models.

Millivolt Wiring

Millivolt units are not provided with factoryinstalled controls; therefore, one of the optional control switches is required to operate the unit (Figure 26):

• ON/OFF Wall Switch,

• Unit-Mountable ON/OFF Switch *,

• Thermostat, or

• Remote Control.

See the ﬁreplace Care and Operation Instructions for details.

* If using a unit-mountable ON/OFF rocker switch with an optional Style View Door, mount the rocker switch on the door instead of the unit.

1. If installing an ON/OFF wall switch or

thermostat, mount it in a convenient location on a wall near the ﬁreplace.

2. Wire the control switch within the

millivolt control circuit using the 15 ft of 2-conductor wire supplied with the unit.

NOTE: The supplied 15 ft 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.

Figure 26: Wiring Diagram—

Millivolt Gas Valves

APPLIANCE- MOUNTED ON/OFF SWITCH (OPTIONAL)

BK/W(1)

THERMOPILE

TP-TH

GAS VALVE

Electronic Wiring

One of the following optional controls may be used:

• ON/OFF Wall Switch,

• Remote Control.

See the ﬁreplace Care and Operation Instructions for details.

NOTE: Electronic models must be connected to the main power supply.

1. Route a 3-wire, 120 Vac, 60 Hz, 1 ph 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 (Table 11

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

on Page 11).

3. Remove the cover plate knockout. Then,

WALL MOUNTED CONFIGURATION FOR FAN SWITCH (OPTIONAL)

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 (Figure 27 and Figure 28). Connect the

FAN

(OPTIONAL)

JUNCTION BOX

BLACK

120 V

white power supply wire to the outlet’s common terminal.

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

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

CAUTION

right against the corner posts.

6. If a wall-mounted ON/OFF control is

In millivolt systems, do NOT connect a wall switch to a 120 V

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

power supply.

Figure 27: Wiring Diagram—Electronic Gas Valves

BATTERY HOLDER

AC/DC POWER ADAPTOR

PROFLAME VALVE

120V AC

OPTIONAL

REMOTE RECEIVER

ON/OFF SWITCH

WALL SWITCH

WIRING COLOR CODE

B = BLACK BR = BROWN GY = GRAY PU = PURPLE R = RED

P/N 580491-01

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

HOT

NEUTRAL

GROUND

LIMIT SWITCH

B-VENT MODELS

ONLY

BL = BLUE G = GREEN O = ORANGE W = WHITE Y = YELLOW

SCHEMATIC REPRESENTATION ONLY

PILOT TUBE

SPARK WIRE CABLE

PILOT GROUND WIRE

ELECTRONIC PILOT ASSEMBLY

HOOD

B B

IGNITER ROD

FLAME SENSOR

G O

PROFLAME DFC BOARD

DFC WIRE HARNESS

OPTIONAL CPI SWITCH OFF (O) = INTERMITTENT PILOT MODE ON (-) = STANDING PILOT MODE

B PILOT SENSOR CABLE

Page 24

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

BLOWER CONTROL CIRCUIT WIRING

7. If an optional control is to be used, wire

it in the low voltage circuit as shown in Figure 27.

NOTE: The supplied 15 ft 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.

8. After the wiring is complete, replace the

cover plate.

WARNING

Electronic models of these appliances are equipped with a three-prong (grounding) plug utilized in connecting the electronic components to the junction box in the lower compartment. This grounding plug provides protection against shock hazard and should be plugged directly into a properly grounded three-prong receptacle. DO NOT cut or remove the grounding prong from the plug.

Wire the [Optional] Blower Kit After Installation in the Framing

FBK-100 and FBK-200 Kits

An electrical outlet box is provided for the installation of the FBK-100 and FBK-200 forced air blower kits. Electrical power must be provided to the box to operate the blower. Install the blower kit according to the installation instructions provided with the kit.

NOTE: The tab connecting the receptacles of the outlet box must be broken (Figure 28).

NOTE: For ﬁreplace models including a factory-installed blower (models with FB designation), an FBK2/FBK3 kit should be installed for proper control. Refer to the included instructions for more information.

Figure 28: Junction Box Wiring

120V, 60HZ, 1PH

neerG - dnuorG

etihW - lar

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

t ueN

120 VAC - Black

Junction Box

Tab Broken

Hot Side of

Red

Black

White

Green

Plug blower into this receptacle

Ground

Blower

Tab Intact

Field Wired

Factory Wired

Receptacle

Neutral Side of Receptacle

Green Ground Screw

Connect the Gas Line

All codes require a shut-off valve mounted in the supply line. Figure 29 illustrates two methods for connecting the gas supply. The ﬂex-line method is acceptable in the U.S., 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 (where permitted) in connecting the unit to the gas line. A gas ﬂex line is provided to aid in attaching the direct vent appliance to the gas supply. The gas ﬂex line can only be used where local codes permit. 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 (Figure 30).

Remove Control Compartment Door

Open the panel by grasping the control compartment door on both sides and gently pulling the top away from the ﬁreplace to disengage the magnetic fasteners. The door is hinged at the bottom. If greater access to the control compartment is required, slide the door, ﬁrst to one side and then the other, so the tabs clear both of the locating holes.

Millivolt and electronic control valves have a 3/8 in. (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). Optionally, seal around the gas line to prevent cold air leakage. Gas line holes and other openings can be caulked or stuffed with unfaced ﬁberglass insulation.

All codes require a shut-off valve mounted in the supply line. The orientation of the shut-off valve should face the front. Figure 29 illustrates two methods for connecting the gas supply. A sediment trap is recommended to prevent moisture and debris in the gas line from damaging the valve.

WARNING

Never use an open ﬂame to check for leaks.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 25

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Thermocouple

HoodIgniter Rod

Thermopile

Pilot Nozzels

3/8 in.

(9 mm)

Min

Gas Stub

1/2 x 3/8 in. Flare

Shut-Off Valve

3/8 in. Flex Tubing

3/8 NPT x 3/8 in.

Flare Fitting

3/8 in. Nipple

3/8 in. Union

3/8 in. Close Nipple

3/8 in. Shut-Off Valve

1/2 x 3/8 in.

Reducer

Gas Valve

Optional Gas Flex Line Connector

Figure 29: Gas Line Connection

Figure 30: Millivolt Gas Valve—Lower Control Compartment

as indicated in the instruction manual. Subsequent lighting of the appliance will not require such purging. Inspect the pilot ﬂame (remove logs, if necessary, handling carefully).

Millivolt Appliance Inspection

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 in. (10 mm) at the pilot generator (thermopile) and the top 1/8 in. (3.175 mm) minimum (tip) of the quick drop out thermocouple should be engulfed in the pilot ﬂame.

The ﬂame should project 1 in. (25 mm) beyond the hood at all three ports (Figure 31). 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 31: Millivolt Pilot

Test Factory and Field Connections for Gas Leaks

Turn on gas supply and test for gas leaks, using a gas leak test solution—also known 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.

1. Light the appliance (refer to the lighting

2. Brush all joints and connections with

3. When the gas lines are tested and leak

Main Gas Shut-Off Valve

Gas Valve

instructions label, in the control compartment or in the Care and Operation Instructions manual).

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 (millivolt units), or turn the receiver or remote control to the OFF position (electronic units). Either tighten or refasten the leaking connection, and then retest as described above.

free, rinse off the leak testing solution.

(Optional) Burner ON/OFF Switch

Piezo

Door Latch

Verify Proper Appliance Operation

WARNING

For all electronic ignition models, remove all ﬁrebox contents, set the gas shutoff valve in the closed position, remove batteries from the battery holder, and ensure the remote / wall receiver is in the OFF position until ready to test/light the ﬁreplace.

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. For piezo igniter location on millivolt appliances, see Figure 30.

NOTE: Lighting instructions may be found on the tags attached to a cable in the control compartment. To access the instructions, open the lower control compartment door (Figure 30) by pulling simultaneously on the left and right top corners of the door. The door is hinged at the bottom (Remove Control Compartment Door on Page 24).

When lighting the appliance for the ﬁrst time, 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

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Electronic Appliance Inspection

To light the burner, turn ON the wall or remote control switch. Ensure the igniter lights the pilot. The pilot ﬂame should engulf the ﬂame rod (Figure 32).

Figure 32: Electronic Pilot

Ignitor

Igniter

Flame Rod

Sensor

Pilot Hood

Page 26

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Install the Contemporary Media

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.

•Contemporary media gets very hot and will remain hot up to one hour after gas supply is turned OFF. Handle only when contemporary media is cool.

•If contemporary media is not installed according to the installation instructions, ﬂame impingement and improper combustion could occur and result in soot and/or excessive productionof carbon monoxide (CO), a colorless, odorless, toxic gas.

•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.

•Only use materials listed here. Only contemporary media authorized have been tested for use within the ﬁrebox and its environment. Do not attempt to use any different materials in the ﬁreplace. Doing so may be dangerous and will void the warranty and will result in incomplete sooting, and poor ﬂame quality.

Table 24: Contemporary Media

Catalog Number

H7536 MTRS Tumbled River Stone

H7537 MCCG-OB

H7538 MBSK

H7578 MCCG-DW

H7579 MCCG-SB

H7581 MBLPK-35ZG

Remove the front glass enclosure panel (Page 28).

This ﬁreplace is designed to accept a number of alternate contemporary media options, allowing the homeowner to customize this product to ﬁt any decor.

Model

Number

Description

Contemporary Glass Obsidian Black

Contemporary Beach Sand

Contemporary Glass Diamond White

Contemporary Glass Deep Sea Blue

Merit Liner Kit, Zen Garden

Zen Garden Firebox Liner (MBLPK-35ZG)

1. Porcelain panels come installed in the

appliance. Remove them by bending the tab, sliding the left and right side panels out ﬁrst, then removing the rear panel.

2. Remove the lintel by removing the two

screws securing it.

3. Insert the Zen Garden rear panel into

ﬁrebox and position against the rear wall of the ﬁrebox (Table 25).

4. Carefully insert the Zen Garden left side

panel into ﬁrebox, at a slight angle away from the sidewall. Position the side panel as far back along the wall as it will go (until it is against the rear panel) and lower it into place, while standing it upright and pressing it down over the knife edge at the rear of the sub-ﬂoor. The sub-ﬂoor knife edge will cut into the refractory panel. Repeat the same procedure for the Zen Garden right side panel (Table 25).

5. Re-install the lintel and screws.

Tumbled River Stone (MTRS)

NOTE: Refractory panels should be installed before the contemporary media is installed.

1. Place stones on the ﬁrebox sub-ﬂoor,

in any atheistically pleasing manner to suite individual taste (Table 25).

NOTE: Ensure stones do not impinge on the burner outlet.

Crushed Glass and Sand (MCCG and MBSK)

NOTE: Refractory panels should be installed before any of the contemporary media are installed.

1. Pour out glass or sand on ﬁrebox sub-

ﬂoor, completely covering the sub-ﬂoor. (Table 25).

NOTE: Avoid letting glass or sand fall into the burner outlet. Make sure no glass or sand falls into the burner ports.

Contemporary Facade

1. Refer to the Facade Installation

Instructions (P/N 506019-40) to install the Contemporary Facade.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 27

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Table 25: MLDVTCD-35 Firebox Liner and Contemporary Media Placement

Rear Zen Garden Panel

Black Obsidian Contemporary Glass

Zen Garden Firebox Liner, Rear Panel

Left Zen Garden Panel

Right Zen Garden Panel

Diamond White Contemporary Glass

Zen Garden Firebox Liner, Side Panels

Burner Outlet

Tumbled River Stone

Burner Outlet

NOTE: River Stone And Beach Sand May Be Used Together

Tumbled River Stone

Contemporary Beach Sand

Burner Outlet

NOTE: Beach Sand And River Stone May Be Used Together

Crushed Glass and Sand

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 28

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Install the 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 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.

NOTE: Visually inspect the gasket on the

backside of the glass door. The gasket surface must be clean, free of irregularities, and seated ﬁrmly. Ensure it is properly located. Make sure the bead is not rolled into the channel at the top of the door, but remains ﬂat against the top of the glass.

Open the lower control compartment door (Page 24).

Position the glass door in front of the ﬁrebox opening with the bottom of the door held away from the ﬁreplace at approximately a 45° angle. Hook the top ﬂange of the glass door over the top of the ﬁrebox frame.

Let the bottom of the glass door swing gently in towards the ﬁreplace ensuring that the gasket seats evenly as the glass door draws shut. Fasten the two latches located beneath the ﬁrebox ﬂoor to the door vee-ﬂange.

Install the hood. Use a screwdriver to open the hood clips slightly if needed. Engage the back edge of the hood into the clips.

NOTE: The three hood clips are located inside the top air channel above the door. The clips are equally-spaced on the top surface of the air channel opening.

Reinstall the lower control compartment door.

Figure 33: Glass Door

Hood

Glass Door

Control

Compartment

Panel

Spring Latch

Remove the Glass Door

Open the lower control compartment door (Remove Control Compartment Door on Page 24). Locate the two (2) latches at the top of the control compartment and disengage them from the door frame bottom vee-ﬂange.

Pull the bottom of the glass door out a few inches and grasp it on the right and left. Gently lift to release the door from the channel above the door. Pull the door forward.

Adjust the Burner

Flame Appearance and Sooting

The ﬂame should be blue at the base, and yellow-orange in the body of the ﬂame.

When the appliance is ﬁrst lit, the entire ﬂame may be blue and will gradually turn yellow-orange during the ﬁrst 15 minutes of operation. If the ﬂame remains 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 yellow-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, ﬁrst 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 ﬂames 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.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 29

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

WARNING

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

•Ensure front glass panel

is in place and sealed

during adjustment.

CAUTION

•Soot will be produced if the air shutter is closed too much. Any damage due to sooting, 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.

1. Move the adjustment rod down to

decrease air ﬂow and up to increase it. (rod located in the lower control area). Position the air shutter to the factory setting as shown in Table 27.

2. Light the appliance (follow the lighting

procedure on the lighting label in the control compartment or in the Care and Operation Instructions).

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 (Figure 34). If the following conditions are present, adjust accordingly.

• If ﬂame appears weak or sooty, adjust the air shutter, incrementally, to a more open position until the proper ﬂame appearance is achieved.

• If ﬂame remains blue, adjust the air shutter, incrementally, to a more closed position until the proper ﬂame appearance is achieved.

Figure 34: Burner Flame Appearance, MLDVTCD-35

Table 27: Factory Air Shutter Settings

Models Gas Type

Natural Gas Closed

MLDVTCD-35

Propane

Factory Air

Shutter Setting

Expose half of

the hole

Burner

Tube

Air Shutter

Adjustment Rod Down (Fully-Closed Position)

Adjustment Set-Screw

Adjustment

Rod Up

(Fully-Open

Position)

Table 26: 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

4. When satisﬁed that the burner ﬂame

appearance is normal, reinstall the lower control compartment door, then proceed to ﬁnish the installation.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 30

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Install the Hood

All models must have a hood installed prior to operation.

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

Figure 35: Combustible Wall Framing

This Area Must Remain Clear of

Combustible

Finished Wall

Materials

Stand Off Must

Be Bent To

Vertical Position

Combustible

Material

May

Touch The

Appliance

Top

Hood

Combustible Materials

1 in. Min.

(25 mm)

Top Of Appliance

3 in. Clearance Min.

3 in.

(76 mm)

Finishing Requirements

This contemporary unit is uniquely suited for mid-wall installations with an available self-ﬁnishing decorative contemporary façade. The decorative contemporary façade is listed in the accessories sections of the Care And Operations manual and consists of three elements that can be mixed and matched for ﬁnishes to taste. This appliance, without the decorative contemporary façade, may be installed on the ﬂoor as a traditional ﬁreplace (Table 9), but if the decorative contemporary façade is to be installed, the unit must be raised on a platform at least 6 in. high (Figure 36).

Figure 36: Contemporary Façade

Dimensions

(889) 44 3/4 (1137)

35 1/2

32 (813)

(737)

16 (406)

33 (838)

24 (610)

NOTE: When raising the MLDVTCD appliance on a platform for mid-wall installations, add the platform height to any of the framing dimensions shown in Table 9 and adjust the gas line dimensions shown in Figure 11 upwards accordingly.

The decorative contemporary façade may be installed over drywall that is butted directly against the sides of the ﬁreplace, or noncombustible wall ﬁnish materials, no more than 3/4 in. thick, that are placed in front of the ﬁreplace black painted face. DO NOT place the façade over combustible materials that are placed in front of the ﬁreplace’s black ﬁnished face. Refer to the installation instructions that accompany the decorative contemporary façade for installation details.

NOTE:

See Cold Climate Insulation on Page 4 and Vent Termination Clearances on Page 6.

Floor

Fireplace

6 in. minimum required

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 31

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Attach the Safety-in-Operation Warnings

NOTE: 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-inOperation Warnings

It is required that the safety instruction labels furnished with the ﬁreplace be afﬁxed to the operation and control point of the ﬁreplace. A safety instruction label must be afﬁxed to the wall switch plate where the ﬁreplace is turned on and off (Figure A) and if used on the remote control handheld transmitter (Figure B). To properly complete the installation of this ﬁreplace, locate the multi-lingual adhesive labels provided with the Care and Operation Instructions and proceed as follows:

1. Locate the wall switch or wall thermostat

that controls the ﬁreplace (verify the switch operates the ﬁreplace 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). Choose the language primarily spoken in the home. If unknown, afﬁx the English language label.

2. If a remote control is used to control the

ﬁreplace, locate the transmitter and clean it thoroughly to remove any dust and oils. Afﬁx the label to the surface of handheld transmitter (Figure B). Choose the language primarily spoken in the home. If unknown, afﬁx the English language label.

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

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

Cat. No. H8024 Replacement Label Kit Étiquettes de remplacement, n° cat. H8024 Juego de etiquetas de repuesto - Nº de cat. H8024

LENNOX HEARTH PRODUCTS 1-800-655-2008

NOTE: English is red text on clear label. French

and Spanish are white text on black label.

SAFETY LABEL DIAGRAMS DIAGRAMMES DES ÉTIQUETTES DE SÉCURITÉ DIAGRAMAS DE ETIQUETAS DE SEGURIDAD

Apposition des mises en garde relatives à la sécurité d’utilisation

Il est impératif que les étiquettes de sécurité fournies avec le foyer soient collées à côté des dispositifs de contrôle du foyer. Une étiquette de sécurité doit être collée sur la plaque de l’interrupteur contrôlant l’allumage du foyer (Figure A) et, le cas échéant, sur le boîtier de la télécommande (Figure B). Pour achever l’installation correcte de ce foyer, procédez comme suit avec les étiquettes adhésives en langues étrangères fournies avec les instructions d’utilisation et d’entretien :

1. Repérez 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). Choisissez la langue qui est principalement parlée dans la résidence du propriétaire. En cas de doute, collez l’étiquette en anglais.

2. Si une télécommande est utilisée pour

contrôler le foyer, nettoyez la soigneusement pour éliminer la poussière et les traces de graisse ou d’huile. Collez l’étiquette sur le boîtier de la télécommande (Figure B). Choisissez la langue qui est principalement parlée dans la résidence du propriétaire. En cas de doute, collez l’étiquette en anglais.

3. Si vous ne trouvez pas les étiquettes, veuillez

appeler Lennox Hearth Products ou votre distributeur Lennox Hearth Products local pour recevoir gratuitement des étiquettes supplémentaires.

LENNOX HEARTH PRODUCTS 1-800-655-2008

Remarqué : Le texte anglais est rouge sur un

support transparent. Le texte français et espagnol est blanc sur un support noir.

Colocación de advertencias de seguridad en operación

Se requiere que las etiquetas de instrucciones de seguridad incluidas con la chimenea se coloquen en el punto de operación y control de la misma. Se debe colocar una etiqueta de instrucciones de seguridad en la placa del interruptor de pared desde el cual se enciende y se apaga la chimenea (Figure A) y en el transmisor de control remoto (Figure B) si se usa. Para completar correctamente la instalación de esta chimenea, encuentre las etiquetas adhesivas multilingües incluidas con las instrucciones de cuidado y operación y haga lo siguiente:

1. 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 (Figure A). Seleccione el idioma que más se habla en la casa. Si no sabe cuál es, use la etiqueta en inglés.

2. Si se usa un control remoto para controlar

la chimenea, encuentre el transmisor y límpielo bien para quitar el polvo y aceite. Pegue la etiqueta en la superﬁcie del transmisor (Figure B). Seleccione el idioma que más se habla en la casa. Si no sabe cuál es, use la etiqueta en inglés.

3. Si no puede encontrar las etiquetas, sírvase

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

LENNOX HEARTH PRODUCTS 1-800-655-2008

Nota: La etiqueta en inglés es transparente con

texto rojo. Las etiquetas en francés y español son negras con texto blanco.

Figure A

Figure B

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 32

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

INSTALLATION ACCESSORIES

Listed Secure Vent® Components

Catalog Number

H1968 SV4.5HT-2

94L10 SV4.5HTSS

H5817 SV4.5-20SSWSK

H2152 SV4.5CGV-1

77L70 SV4.5L6

77L71 SV4.5L12

77L72 SV4.5L24

77L73 SV4.5L36

77L74 SV4.5L48

77L75 SV4.5LA

77L76 SV4.5E45 45° Elbow

Model Description

Horizontal Square

Termination with

Firestop/Spacer

(H2246), and

Adaptor (74L61)

Rigid, Horizontal,

Small Square

Termination

with Firestop/

Spacer (H2246), Adaptor (74L61)

(Ref. Instruction

P/N 750204M)

Rigid, Small, Square

Termination, 20 in.

with Shield and

Firestop

(Ref. Instruction

P/N 750247M

and 750204M)

Vertical Termination

Cap, High Wind

6 in. (152 mm)

Vent Section

12 in. (305 mm)

Vent Section

24 in. (610 mm)

Vent Section

36 in. (914 mm)

Vent Section

48 in. (1219 mm)

Vent Section

Telescopic Section

(2–7.5 in. Rigid)

Listed Secure Vent® Components

Catalog Number

The following ﬂashing comes packaged with a storm collar

77L78 SV4.5F Flat Roof Flashing

77L79 SV4.5FA

77L80 SV4.5FB

77L81 SV4.5SC6

H2246 SV4.5HF

H2247 SV4.5VF

96K93 SV4.5SU Support Strap

H3907 SV4.5ARSA

H5816 SV4.5TWSK

96K92 SV4.5SP Support Plate

87L02 SV4.5HGS

H5820 4.5HTSK

99L03 SV4.5HRK36

99L02 SV4.5HRK14

Model Description

1/12 to 7/12

Adjustable Flashing

7/12 to 12/12

Adjustable Flashing

Storm Collar

(6 per box)

Firestop/Spacer

10-pack Horizontal

(3-1-1 spacing) Firestop/Spacer

10-pack Vertical

(1-1-1 spacing)

Adjustable Attic

Insulation Shield

(12–22 in.)

Through Wall Shield

Kit (not shown)

(10-pack)

Termination Guard

Square (not shown)

Horizontal

Termination

Shroud Kit

Horizontal Riser

Kit, 36 in.

Horizontal Riser

Kit, 14 in.

77L77 SV4.5E90 90° Elbow

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

H8914 SV4.5TK90HT2

H8915 SV4.5TK90SS

Horizontal

Termination Kit HT-2

with 90° elbow

Horizontal

Termination Kit Small

Square with 90°

elbow

Page 33

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Listed Secure Flex® Components

Catalog

Number

Model Description

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

60L10 SF-18

98K03 SF-12

H1969 SF4.5HT-2

18 ft (5.49 m)* compressed ﬂex

(ref. Instruction P/N 750053M)

12 ft (3.66 m)*compressed ﬂex

(ref. Instruction P/N 750052M) Horizontal Square Termination

for ﬂex (without ﬂex) Square Term. for ﬂex

77L87 SFKIT12S

with 12 in. (305 mm)*

compressed ﬂex

Square Term. for ﬂex

77L88 SFKIT18S

with 18 in. (457 mm)*

compressed ﬂex

Square Term. for ﬂex

77L89 SFKIT24S

with 24 in. (610 mm)*

compressed ﬂex

Square Term. for ﬂex

77L90 SFKIT36S

with 36 in. (914 mm)*

compressed ﬂex

Square Term. for ﬂex

77L91 SFKIT48S

with 48 in. (1219 mm)*

compressed ﬂex

Small Square Termination for

94L04 SFKIT12SS

ﬂex, with 12 in. (305 mm)

of *compressed ﬂex vent

(ref. Instruction P/N 750204M)

Small Square Termination for

94L05 SFKIT18SS

ﬂex, with 18 in. (457 mm)

of *compressed ﬂex vent

(ref. Instruction P/N 750204M)

Small Square Termination for

94L06 SFKIT24SS

ﬂex, with 24 in. (610 mm)

of *compressed ﬂex vent

(ref. Instruction P/N 750204M)

Small Square Termination for

94L07 SFKIT36SS

ﬂex, with 36 in. (914 mm)

of *compressed ﬂex vent

(ref. Instruction P/N 750204M)

Small Square Termination for

94L08 SFKIT48SS

ﬂex, with 48 in. (1219 mm)

of *compressed ﬂex vent

(ref. Instruction P/N 750204M)

Horizontal Small Square

94L09 SF-HTSS

Termination for ﬂex, without

ﬂex vent (ref. Instruction

P/N 750204M)

Vertical Termination for ﬂex

(ﬂat to 6/12) with ﬂex adaptor,

56L74 SFVT30

section of rigid vent, roof

support collar assembly, roof

ﬂashing and storm collar.

(ref. Instruction P/N 750052M)

Vertical Termination for ﬂex

(6/12 to 12/12) with ﬂex

56L75 SFVT45

adaptor, section of rigid vent,

roof support collar assembly,

roof ﬂashing and storm collar.

(ref. Instruction P/N 750052M)

Listed Secure Flex® Components

Catalog Number

Model Description

H1986 CTSA-33

H1985 CTSO-33

H1987 CTSO-44

H1986 CTSO-46

60L10 SF-18 18 ft (5.49 m) * compressed ﬂex

98K03 SF-12 12 ft (3.66 m) * compressed ﬂex

10K81 SFMP Mil Pac high temperature sealant

89L40 SFMP-12

91L66 SFGC4-6

91L67 SFGC7-6

H2248 SF4.5HF-10

H2249 SF4.5VF-10

Mil Pac high temperature

Gear Clamp 4.5 in. (114 mm)

Gear Clamp 7.5 in. (190.5 mm)

Firestop/Spacer, Horizontal, ﬂex

(3-1-1 spacing), 10-Pack

Firestop/Spacer, Vertical, ﬂex

(1-1-1 spacing),10-Pack

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

Chase Top Shroud Kit,

Arch Top, 3 x 3

Chase Top Shroud Kit,

Open Top, 3 x 3

Chase Top Shroud Kit,

Open Top, 4 x 4

Chase Top Shroud Kit,

Open Top, 4 x 6

sealant, 12-pack

for ﬂex (6-pack)

for ﬂex (6 pack)

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 34

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • 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.

In Canada: THE CONVERSION SHALL BE CARRIED

OUT BY A MANUFACTURER’S AUTHORIZED REPRESENTATIVE, IN ACCORDANCE WITH THE REQUIREMENTS OF THE MANUFACTURER, PROVINCIAL OR TERRITORIAL AUTHORITIES HAVING JURISDICTION AND IN ACCORDANCE WITH THE REQUIREMENTS OF THE CAN/CGA-B149.1 OR CAN/CGA-B149.2 INSTALLATION CODES.

La conversion devra être effectuée conformément aux recommandations des autorités provinciales ayant juridiction et conformément aux exigences du code d’installation CAN/ CSA-B149.1.

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.

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.

Table 28: Millivolt SIT Systems, Natural Gas To Propane Gas Conversion Kits

Model Catalog Number

MLDVTCD-35 H7292

Table 29: Millivolt SIT Systems, Propane Gas to Natural Gas Conversion Kits

Model Catalog Number

MLDVTCD-35 H7293

Table 30: Electronic SIT Systems, Natural Gas To Propane Gas Conversion Kits

Model Catalog Number

MLDVTCD35NE-2 H8921

Table 31: Electronic SIT Systems, Propane Gas To Natural Gas Conversion Kits

Model Catalog Number

MLDVTCD35NE-2 H8926

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.

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 35

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • INSTALLATION INSTRUCTIONS

Pressure Regulator

Remove These Components

Pilot

Orifice

Installing Gas Conversion Kits

WARNING

The gas supply shall be shut off prior to disconnecting the electrical power, before proceeding with the conversion.

AVERTISSEMENT

Avant d’effecteur la conversion, coupez d’abord l’alimentation en gaz, ensuite, coupez l’alimentation electrique.

1. TURN OFF THE GAS SUPPLY TO THE

APPLIANCE and disconnect power supply at the circuit breaker. Ensure appliance is cold.

2. Open the lower control compartment door (Figure 30 on Page 25) by pushing on the right top corner of the door. The door is hinged at the bottom.

[Optional] Remove the control compartment door by sliding the hinge pin, located at the door’s left side, to the right until it disengages from the left corner post hole. Pull the control compartment door diagonally to the left, away from the ﬁreplace.

3. Remove the front glass door/frame from the appliance (Page 28).

4. Carefully remove the contemporary media (Page 26).

5. Remove the burner assembly with the attached venturi tube.

Millivolt and Electronic Ignition System Appliances

6. SIT Systems—Refer to Figure 37, Figure 38, and the instructions

provided with the SIT Regulator Conversion Kit. Using a Torx T20 driver (with 1/4 in. shank) or slotted screwdriver, remove and discard the pressure regulator mounting screws (two screws for electronic models, three screws for millivolt models), pressure regulator tower, the diaphragm assembly (if applicable) and the spring. Discard all removed components.

Figure 37: Millivolt Valve

Regulator Conversion

Figure 38: Electronic Valve

Regulator Conversion

7. Ensure the rubber gasket installed on

the back of the replacement pressure regulator is properly positioned, and install the new pressure regulator assembly using the supplied screws. Tighten the screws to 25 lb-in.

8. Install the enclosed identiﬁcation label

to the valve body where it can be easily seen.

9. Remove the pilot hood assembly

to access the hexed pilot oriﬁce (Figure 39). 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.

Figure 39: Millivolt Pilot

DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Figure 40: Electronic Pilot

Ignitor

Igniter

Flame Rod

Sensor

Pilot Hood

10. Remove the oriﬁce from the manifold

and replace it with the one provided in the kit (Figure 41). See Table 4 on Page 4 for oriﬁce sizes.

Figure 41: Oriﬁce

11. Use pipe joint compound or Teﬂon®

tape on all pipe ﬁttings before installing. NOTE: Ensure propane resistant

compounds are used in propane applications, do not use pipe joint compounds on ﬂare ﬁttings.

12. Retrieve the burner and hold the venturi

tube above the oriﬁce. Place the shutter adjusting rod in the slot of the shutter arm (see Table 27 on Page 29). Set the burner assem bly into its position and secure the trapezoidal plate with the two screws previously removed.

13. Reinstall the bafﬂe with the two bafﬂe

securing screws.

14. Reassemble the remaining components.

15. Turn on gas supply and test for gas leaks (Page 25).

16. Relight the main burner. The

lighting instructions can be found on the lighting label in the control compartment or in the Care and Operation Manual provided with the appliance. Verify proper burner ignition and operation (Page 25).

17. Inspect the pilot system for proper ﬂame. The pilot ﬂame should engulf the ﬂame sensor (Page 25).

18. Using a manometer, test the inlet and manifold gas pressures (Table 2 and Table 3).

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

Page 36

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MLDVTCD-35 • 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.

LENNOX®, the LENNOX design, DAVE LENNOX, the image of DAVE LENNOX and other related LENNOX marks are registered or common law trademarks of Lennox Industries Inc. and are used with permission.

P/N 506015-09 Rev. A 04/2013

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

Lennox Merit MLDVTCD-35NM, Merit MLDVTCD-35NM-FB, Merit MLDVTCD35NE-2, Merit MLDVTCD-35NE-FB Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual