Lennox MLDVT-40NM-FB, MLDVT-35NM-FB, MLDVT-45NM, MLDVT-30PM, MLDVT-35PM Care And Operation Instructions Manual

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Page 1

CARE AND OPERATION INSTRUCTIONS

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See Page 2 For Details

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SAFETY

GUARD

PROTECTS AGAINST BURNS

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.

P/N 506017-09 Rev. A 04/2013

This manual is part of a set of two supporting this product. Refer to P/N 506015-10 for Installation Instructions.

Ce manuel est disponible en francais, simplement en faire la demande. Numéro de la pièce 506223-57.

WHAT'S INSIDE

Table of Contents ........................................... 2

Safety and Your Fireplace.................................... 2

FREE Safety Guard Offer (Protects Against Burns) ................. 2

Important Safety Information ................................. 4

Attaching the Safety-in-Operation Warnings ..................... 5

[EN FRANÇAIS] L’information de sûreté importante ............... 3–4

Apposition des mises en garde relatives à la sécurité d’utilisation .... 5

[EN ESPAÑOL] Información importante de seguridad .............. 3–4

Colocación de advertencias de seguridad en operación ............ 5

Wait...

DON’T THROW IT AWAY!

This manual contains

important operating

and safety

information.

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.

MLDVT Direct-Vent Gas Fireplaces

MODELS

MLDVT-30NM MLDVT-35NM MLDVT-35NM-FB MLDVT-40NM MLDVT-40NM-FB MLDVT-45NM

Report No. 100326540PRT-001

MILLIVOLT:

MLDVT-30PM MLDVT-35PM MLDVT-35PM-FB MLDVT-40PM MLDVT-45PM

™

ELECTRONIC:

MLDVT30NE-2 MLDVT35NE-2 MLDVT-35NE-FB MLDVT40NE-2 MLDVT-40NE-FB MLDVT45NE-2

Page 2

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

Thank you for your purchase. We appreciate your business!

Please carefully read and follow all instructions in this manual.

Pay special attention to all warnings and safety information.

Following these safety, care, and operation instructions will help ensure many years of dependable and enjoyable service from your ﬁreplace.

Safety and

Your Fireplace

To help us keep you up-to-date on product information and offers, please take a few moments to register your product online at:

www.lennoxhearthproducts.com (Owner Resources > Product Registration)

•

FREE

The Lennox® SAFETY GUARD protects against severe burns and injuries

by preventing direct contact with the front glass surface of your ﬁreplace.

To receive your FREE SAFETY GUARD, call 1-800-655-2008

or visit www.lennoxhearthproducts.com (Owner Resources > Safety First).

Note: Safety Guards may not be available for some older models no longer in production.

SAFETY GUARD

OFFER

•

TABLE OF CONTENTS

Safety and Your Fireplace................................. 2

Important Safety Information .............................. 4

Attaching the Safety-in-Operation Warnings .................. 5

Appliance Installation, Service, and Maintenance Notices ..........6

Appliance Operation Notices ................................6

Warranty Information ......................................6

General Information ....................................... 7

Operation/Care of Your Appliance ............................8

Gas Controls Access ......................................8

Variable Flame Adjustment ..................................9

Maintenance ............................................10

Front Glass Enclosure Panel, Removal and Installation ...........11

Install Volcanic Stone, Embers and Logs ......................12

Burner Flame Appearance/Sooting ...........................15

Burner Flame Adjustments .................................16

Millivolt Appliance Checkout ...............................16

Electronic Appliance Checkout ..............................16

Ordering Replacement Parts ...............................17

Product Reference Information .............................17

Wiring Diagrams ........................................17

Accessory Components ...................................18

Lighting Instructions – Millivolt .............................21

Lighting Instructions – Electronic ...........................23

Maintenance Schedule ....................................25

Troubleshooting Guide – Millivolt. . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Troubleshooting Guide – Electronic ..........................27

Replacement Parts List ...................................28

All parts of your Lennox

Hearth Products ﬁreplace

get EXTREMELY HOT!

 To prevent severe burns and injuries, install

a screen or physical barrier to prevent direct contact with the glass.

To order a FREE Lennox® SAFETY GUARD for your ﬁreplace, see details at left.

 Follow the safety instructions below

and be sure everyone in your household understands this burn hazard:

•The surfaces on your ﬁreplace get EXTREMELY HOT!

•The glass on the front of the ﬁreplace reaches EXTREMELY HIGH temperatures and can cause severe burns if touched.

•Keep children away from an operating ﬁreplace. Closely supervise children in any room where a ﬁreplace is operating to prevent contact with glass.

•Keep clothing, furniture, gasoline, and other ﬂammable liquids away from the ﬁreplace.

•Even after the gas is turned off, ﬁreplace surfaces remain extremely hot.

 Be sure to attach the enclosed Safety-in-

Operation Warnings where you turn on your

ﬁreplace, to help remind everyone of the dangers associated with high temperatures (see page 5).

 Read Important Safety Information on

page 4.

Page 3

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

[FRENCH] [SPANISH]

La sécurité et

votre foyer

Toutes les parties de votre foyer

Lennox Hearth Products deviennent

EXTRÊMEMENT CHAUDES !

 Aﬁn d'éviter de vous brûler gravement ou de

vous blesser, installez une grille ou une barrière physique pour empêcher tout contact direct avec la vitre.

Pour commander un PANNEAU DE PROTECTION Lennox® GRATUIT pour votre foyer, consultez les détails dans la partie gauche.

 Suivez les instructions de sécurité ci-dessous

et veillez à ce que tous les membres de votre famille soient conscients du danger de brûlure encouru :

•Les surfaces de votre foyer deviennent EXTRÊMEMENT CHAUDES !

•La vitre située à l'avant du foyer atteint des températures EXTRÊMEMENT ÉLEVÉES et peut causer de graves blessures en cas de contact.

•Tenez les enfants à l'écart du foyer lorsqu'il fonctionne. Surveillez attentivement les enfants dans les pièces où un foyer est utilisé aﬁn d'éviter qu'ils ne soient en contact avec la vitre.

•Tenez tous les vêtements, les meubles, l'essence et tout autre liquide inﬂammable à l'écart du foyer.

•Même après fermeture du gaz, les surfaces du foyer restent extrêmement chaudes.

Seguridad y

su chimenea

¡Todas las partes de la chimenea

Lennox Hearth Products se ponen

MUY CALIENTES!

 Instale una malla o barrera física para evitar

el contacto directo con el vidrio y prevenir las quemaduras y lesiones graves.

Ver los detalles a la izquierda para ordenar un Lennox® SAFETY GUARD GRATIS para su chimenea.

 Siga las instrucciones de seguridad a

continuación y asegúrese de que todos en su hogar sepan acerca de este peligro de quemadura:

•¡Las superﬁcies de la chimenea se ponen MUY CALIENTES!

•El vidrio delante de la chimenea alcanza temperaturas EXTREMADAMENTE ALTAS y puede causar quemaduras graves si se toca.

•Mantenga a los niños alejados de la chimenea en funcionamiento. Supervise en forma cercana a los niños en cualquier cuarto donde haya una chimenea funcionando para impedir el contacto con el vidrio.

•Mantenga la ropa, mobiliario, gasolina y otros líquidos inﬂamables alejados de la chimenea.

•Aún después de haber apagado el gas, las superﬁcies de la chimenea permanecen extremadamente calientes.

 Veillez à coller les Étiquettes de mise en garde

relatives à la sécurité d'utilisation à l'endroit

où vous utilisez le foyer, pour rappeler à tous les utilisateurs les dangers liés aux températures élevées (voir page 5).

 Lisez la section Informations importantes

relatives à la sécurité, page 4.

 Asegúrese de colocar las Etiquetas de

advertencia de seguridad de operación en

el lugar donde enciende la chimenea, para que todos recuerden los peligros asociados con las altas temperaturas (ver la página 5).

 Lea la Información importante de seguridad

en la página 4.

Page 4

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

Important Safety Information

1. WARNING: Do not operate appliance with the glass front removed, cracked or broken. Replacement of the glass should be done by a licensed or qualiﬁed service person .

2. Do not use this appliance if any part has been under water. Immediately call a qualiﬁed service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

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

4. Children and adults should be alerted to the hazards of high surface temperature and should stay away to avoid burns or clothing ignition.

5. Clothing or other ﬂammable material should not be placed on or near the appliance.

6. 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.

7. Any safety screen or guard removed for servicing an appliance must be replaced prior to operating the appliance.

8. 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, et cetera. It is imperative that control compartments, burners, and circulating air passageways of the appliance be kept clean. See maintenance instructions on page 10.

L'information de sûreté importante

1. AVERTISSEMENT. Ne pas utiliser l’appareil si le panneau frontal en verre n’est pas en place, est craqué ou brisé. Conﬁez le remplacement du panneau à un technicien agréé

2. 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.

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.

4. Les enfants et les adultes devraient être informés 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.

5. On ne devrait pas placer de vêtements ni d’autres matières inﬂammables sur l’appareil ni à proximité.

6. 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.

7. Tout écran ou protecteur retiré pour permettre l’entretien de l’appareil doit être remis en place avant de mettre l’appareil en marche.

8. 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 poussière. Il est essentiel que les compartiments abritant les commandes, les brûleurs et les conduits de circulation d’air de l’appareil soient tenus propres. Voyez les instructions d’entretien à la page 10.

[SPANISH]

Información importante de seguridad

1. ADVERTENCIA: No opere el artefacto con el frente de vidrio quitado, agrietado o roto. Un técnico de servicio licenciado o capacitado debe reemplazar el vidrio.

2. No use este artefacto si alguna de sus partes ha estado bajo agua. Llame de inmediato a un técnico de servicio caliﬁcado para que inspeccione el artefacto y reemplace cualquier parte del sistema de control y cualquier control de gas que haya estado bajo agua.

3. Debido a las altas temperaturas, el artefacto debe situarse fuera de las áreas de tráﬁco y lejos del mobiliario y cortinas.

4. Se debe alertar a los niños y adultos sobre los peligros de las altas temperaturas en la superﬁcie y que se mantengan alejados para evitar quemaduras o ignición de la ropa.

5. No debe colocarse ropa u otros materiales inﬂamables

sobre y cerca del artefacto.

6. Se debe supervisar de cerca a los niños cuando estén en el mismo cuarto que el artefacto. Los niños pequeños, los jóvenes y otras personas pueden ser susceptibles a quemaduras por contacto accidental. Se recomienda instalar una barrera física si hay personas en riesgo en la casa. Para restringir el acceso a una chimenea o estufa, instale una puerta de seguridad ajustable para mantener a los niños pequeños, jóvenes y otras personas en riesgo fuera del cuarto y lejos de las superﬁcies calientes.

7. Cualquier malla o resguardo de seguridad quitado para dar servicio a un artefacto, debe reinstalarse antes de operar el artefacto.

8. Una persona de servicio competente debe realizar la instalación y reparación. Una persona de servicio profesional debe inspeccionar el artefacto antes de usar al menos una vez por año. Se puede requerir limpieza más frecuente debido a la pelusa excesiva del alfombrado, del material de cobijas, etc. Es imprescindible mantener limpios los compartimientos de control, los quemadores y los pasajes de circulación del aire del artefacto. Ver las instrucciones de mantenimiento en la página 10.

Page 5

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

HOMEOWNER’S INSTRUCTIONS - ATTACHING SAFETY-IN-OPERATION WARNINGS

ATTACHING SAFETY-IN-OPERATION WARNINGS

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

1. Locate the wall switch or wall thermostat that controls the ﬁreplace (verify the switch operates the 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) or the wall thermostat (Figure B). Choose the language

primarily spoken in the home.

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

Choose the language primarily spoken in the

home.

3. If you are unable to locate the labels, please call Lennox Hearth Products or your nearest Lennox Hearth Products dealer to receive additional safety instruction labels free of charge.

Cat. No. H8024 Replacement Label Kit

LENNOX HEARTH PRODUCTS 1-800-655-2008

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

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

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

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

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

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

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

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

Étiquettes de remplacement, n° cat. H8024

LENNOX HEARTH PRODUCTS 1-800-655-2008

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

COLOCACIÓN DE ADVERTENCIAS DE SEGURIDAD EN OPERACIÓN

Su chimenea incluye etiquetas de instrucciones de seguridad que deben colocarse en el punto de operación y control de la chimenea. Se debe colocar una etiqueta de instrucciones de seguridad en la placa del interruptor de pared desde el cual se enciende y se apaga la chimenea (ver la Figura A) o en el termostato de pared (ver la Figura B) y en el transmisor de control remoto (Figura C) si se usa. Las advertencias ya deben haberse colocado cuando se completó la instalación inicial de la chimenea. Si no están colocadas en estos lugares, encuentre las etiquetas adhesivas multilingües proporcionadas con estas instrucciones y prosiga de la siguiente manera:

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

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

3. Si no puede encontrar las etiquetas, sírvase llamar a Lennox Hearth Products o al distribuidor de Lennox Hearth Products más cercano para recibir etiquetas de instrucciones de seguridad adicionales gratuitas.

Juego de etiquetas de repuesto - Nº de cat. H8024

LENNOX HEARTH PRODUCTS 1-800-655-2008

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

Figure A

SAFETY LABEL

DIAGRAMS

DIAGRAMMES DES ÉTIQUETTES

DE SÉCURITÉ

Figure B

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

DIAGRAMAS DE ETIQUETAS

DE SEGURIDAD

Figure C

Page 6

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

Appliance Installation, Service, and Maintenance Notices

IMPORTANT: 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.

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

Draft relief openings must not be covered or blocked.

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

Any change to this appliance and/or its operating controls is dangerous. Improper installation or use of this appliance can cause serious injury or death from ﬁre, burns, explosion or carbon monoxide poisoning.

Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning are similar to the ﬂu with headaches, dizziness and/or nausea. If you have these signs, obtain fresh air immediately. Turn off the gas supply to the appliance and have it serviced by a qualiﬁed professional, as it may not be operating correctly. Some people are more affected by carbon monoxide than others, including pregnant women, people with heart or lung disease or anemia, those under the inﬂuence of alcohol, and those at high altitudes.

Turn off gas and electrical power to the ﬁreplace and allow it to cool before cleaning or servicing the appliance.

Appliance Operation Notices

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

These ﬁreplaces are vented gas appliances. Do not burn wood or other material in these appliances.

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

This appliance is only for use with the type of gas indicated on rating plate. This appliance is not convertible for use with other gases, unless a certiﬁed kit is used.

These appliances are designed to operate on natural gas or propane gas only. The use of other fuels or combinations of fuels will degrade the performance of this system and may be dangerous.

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

Do not use this appliance if any part has been under water. Immediately call a qualiﬁed service technician to inspect the appliance and to replace any part of the control system and any gas control that has been under water.

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, we recommend the use of a termination guard. See Page 20 for ordering information.

Warranty Information

Your gas appliance is covered by a limited twenty-year warranty. You will ﬁnd a copy of the warranty accompanying this manual. Please read the warranty to be familiar with its coverage.

Retain this manual. File it with your other documents for future reference.

Failure to comply with the installation and operating instructions provided will result in an improperly installed and operating appliance, voiding its warranty.

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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 7

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

GENERAL INFORMATION

The ﬁreplace models covered in this manual are direct-vent sealed combustion gas ﬁreplace heaters designed for residential application. These direct-vent appliances operate with the combustion chamber completely isolated from the indoor environment.

All air for combustion is brought in from the outside and exhaust gases are vented through

the same direct-vent, co-axial (intake/exhaust)

vent system. The Millivolt appliances have a millivolt gas

control valve with piezo ignition system. If any optional accessories which require electrical power are being installed, the electrical power must be provided at the time of appliance installation.

The Electronic appliances have a battery backed- up electronic intermittent pilot system. The bat-

tery backup will allow you to continue operation

of the appliance during a power outage. These appliances comply with National Safety

Standards and are tested and listed by ETL/

Intertek (Report No. 100326540PRT-001) to

ANSI Z21.88 (in Canada, CSA-2.33), and CAN/

CGA-2.17-M91 in both USA and Canada, as

vented gas ﬁreplace heaters. 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.

BTU Input

Millivolt and electronic models come standard

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

Input (BTU/HR) Manually-Modulated

Gas Valves (all models)

Model

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

Table 1

Input Rate (BTU / HR)

Nat. Gas Prop. Gas

13,500 high

10,500 low

16,000 high

12,500 low

20,000 high

15,500 low

23,000 high

17,500 low

12,500 high

9,000 low

15,000 high

11,500 low

20,000 high

15,800 low

22,000 high

17,000 low

Gas Pressure Requirements

(All Models)

Gas pressure requirements are listed in Tables 2 and 3.

Test gauge connections are provided on the front of the millivolt gas control valve, identiﬁed IN for the inlet and OUT for the manifold side (see Figure 3 and Figure 4 on Page 9).

Inlet Gas Supply Pressure (all models)

Fuel # Minimum Maximum

Natural Gas

Propane

4.5" WC

(1.12 kPa)

11.0" WC

(2.74 kPa)

10.5" WC

(2.61 kPa)

13.0" WC

(3.23 kPa)

Table 2

Manifold Gas Supply Pressure (all models)

Fuel # Low High

Natural

Gas

Propane

(Lo) 2.2" WC

(0.55 kPa)

(Lo) 6.3" WC

(1.57 kPa)

(Hi) 3.5" WC

(0.87 kPa)

(Hi) 10.0" WC

(2.49 kPa)

Table 3

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).

Burn-in Period

During the ﬁrst few ﬁres in this appliance, there will be some odor due to the curing of the paint and burning off of lubricants used in the manufacturing process. Depending on your

use, the burn-in period may take a few hours

or a few days.

KEEP YOUR HOUSE WELL VENTILATED DURING THE BURN-IN PROCESS. THE ODOR AND HAZE EMITTED DURING THE BURN-IN PROCESS CAN BE QUITE NOTICEABLE AND MAY SET OFF A SMOKE DETECTOR.

If an optional blower is installed, do NOT turn it on during the burn-in period.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Oriﬁce Sizes

(Sea Level to High Altitude – All Models)

These appliances are tested and approved for installation at elevations of 0-4500 feet (0-1372 meters) above sea level using the standard

burner orice sizes (marked with an asterisk

[*] in Table 4). For elevations above 4500 feet, contact your gas supplier or qualiﬁed service technician.

Deration

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

• Using gas that has been derated by the gas

company.

• Changing the burner orice to a smaller size

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

Install the appliance according to the regulations of the local authorities having jurisdiction and, in the USA, the National Fuel Gas Code NFPA 54 / ANSI Z223.1 - latest edition or, in Canada, the CAN/CSA-B149.1 - latest edition.

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

Burner Oriﬁce Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Model

Series

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

Nat.Gas

drill size (inches)

#50 (0.070")*

#44 (0.086")*

H4873

(0.0748")*

H1355

60J80

(0.090")*

37L70

•

Propane

drill size (inches)

#59 (0.041")*

#55 (0.052")*

#54 (0.055")*

H7838

(0.045")*

75L10

19L52

99K79

•

*Standard size installed at factory. Table 4

•

Part /Cat. Number.

IMPORTANT NOTE!

A white ﬁlm may develop on the glass enclosure panel during the ﬁrst few ﬁres as part of the burn-in process.

The ﬁrst few times you use the fireplace, clean the glass after each use (AFTER THE GLASS HAS COMPLETELY COOLED); otherwise, the white ﬁlm will bake onto the glass and become difficult to remove.

See “Cleaning Glass” on Page 10.

Page 8

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

OPERATION AND CARE OF YOUR APPLIANCE

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.

On millivolt systems, the piezo igniter, HI/LO

ame adjustment knob, and pilot and main gas OFF/ON control knob are located below

the glass panel enclosure. The gas valve for electronic systems is also located below the glass enclosure panel (see Figure 1).

Reinstalling Control Compartment Door

If necessary, reinstall the door by inserting the tabs on each side of the door into the corresponding holes in the control compartment opening, one side ﬁrst then the other. Swing the door gently up and fasten it by pushing it in until the magnetic latches

catch and lock it in place.

The standard controls for appliance operation are located behind the panel below the appliance front glass enclosure panel (Figure 1). Optional control switches are also available (see Page 18 - Remote Wall Switch, Remote

Control, Unit Mounted Rocker Switch or Wall Thermostat).

Operation of millivolt and electronic gas control systems are different. Before lighting and operating your appliance determine if you have a millivolt or electronic appliance. Familiarize yourself with the gas control valve that your appliance uses. Refer to Figure 1 for access to the gas control valve.

3 Inch Pipe Nipple

Main Gas

Shut-Off Valve

Figure 1

Control Compartment Door Tab

Figure 2

Gas Flex Line

Rocker Switch (Millivolt only) /

Pilot Control Switch (Electronic only)

Valve

Lower Control

Compartment

Piezo (Millivolt only)

Spring Door

Latch

Gas Controls/Control Compartment Access

The gas controls can be found behind the control compartment access door.

Removing 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.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Millivolt Appliances - Appliances with

Millivolt systems will be tted with the gas

control valve shown in Figure 3.

Electronic Appliances - Appliances with

electronic systems will be ﬁtted with the electronic valve shown in Figure 4.

Millivolt Appliances - To light millivolt appliances refer to Figure 1. Detailed lighting instructions are found on Pages 21 and 22.

Millivolt appliance lighting instructions may also be found on the pull out lighting instruction labels attached to the gas control valve.

Once the pilot is lit, the main burner may be turned ON and OFF using a wall switch, remote

control, optional on unit rocker switch (FRS),

or wall thermostat. To operate: Toggle the switch between its ON and OFF positions.

If your millivolt appliance is equipped with an

optional remote switch kit (wall switch, remote control, rocker switch, or wall thermostat) and

the pilot is lit, the appliance main burner may be turned on and off using the optional switch.

Note: To prevent excessive resistance in burner circuit (which can cause burner operation problems), only one burner control switch should be wired to valve.

Page 9

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

Gas Inlet

Terminals TPTH, TP and TH

Gas Outlet

Electronic Appliances

To light electronic appliances refer to the detailed lighting instructions found on Pages 23 and 24 of these instructions. Electronic appliance lighting instructions may also be found on the pull out lighting instruction labels attached to the gas control valve.

If your electronic appliance is equipped with an

optional remote wall switch or remote control kit

the appliance main burner may be turned on and off with the wall switch or remote control.

If your electronic appliance is not equipped with a wall switch or remote control, the main burner must be turned off and on with a gas control switch located in some other location by the installer. Contact the installer for directions.

Check batteries, if installed, routinely (every

three months).

TO LIGHT YOUR APPLIANCE IN A POWER

OUTAGE DO THE FOLLOWING:

•Conrmbatteriesinstalledinbatterypack.

•Turnunitmountedswitchorwallswitch

to the ON Position.

•Unitshouldsparkatpilotandlight.

NOTE: If no spark, replace batteries.

•OperateNormally.

Note: Install fresh batteries in the battery holder prior to the start of burn season, so the ﬁreplace can automatically switch to battery power (4 "AA" batteries) in the event of a power outage.

Refer to the Lighting Instructions on Page 23 to light the appliance in the event of a power failure.

Main Gas Control Knob

OUT

Inlet Pressure Port

Manifold Pressure Port

Gas Inlet

Terminals TPTH, TP and TH

Variable Flame Height Adjustment

Figure 3: SIT Millivolt 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

Figure 4: SIT Electronic Gas Valve

(from DFC Wire

Harness)

Yellow Ground Wire (from DFC Wire Harness)

Gas Outlet

Hi/Lo Flame Control Knob

Variable Flame Height Adjustment

All millivolt and electronic appliances are equipped with a variable gas control valve. Flame height for these models may be adjusted through a range between ﬁxed low and high settings while the appliance is in operation. Adjust the ﬂame

TPTH TP TH

height as desired after lighting the appliance by

rotating the variable adjustment control knob

(HI/LO) located on the front of the valve (refer to Figures 3 and 4).

CPI (Continuous Pilot Ignition) Switch

Models equipped with SIT electronic gas

valves may have a CPI switch located in the lower control compartment (Figure 1).

This switch allows the pilot to be switched from intermittent mode (pilot is extinguished when the ﬁreplace is OFF) to continuous mode (pilot stays on when ﬁreplace is OFF).

In periods of extreme cold, you may notice condensation on the glass door when the ﬁreplace is OFF and the pilot is in intermittent mode. Also, with the pilot in intermittent mode, you may ocassionally experience "cycle startup", where the pilot and burner ignite but then the burner may extinguish and reignite several times until the ﬂue reaches temperatures for proper drafting. Switching the pilot to continuous mode during periods of extreme weather may eliminate condensation on the glass door and "cycle startup". In more moderate weather, return the pilot to intermittent mode.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 10

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

MAINTENANCE

(See Maintenance Schedule, Page 25)

Refer to the maintenance schedule for maintenance

tasks, procedures, frequency and by whom they

should be performed. Always verify proper operation of the appliance after servicing.

WARNING

Turn off gas and electrical power to the ﬁreplace and allow it to cool before cleaning or servicing the appliance.

CAUTION: Wear gloves and safety glasses for protection while doing required maintenance.

Verify proper operation after servicing.

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

Always turn off gas to the pilot (millivolt appliances) before cleaning. Before relighting, refer to the lighting instructions in this manual. Instructions are also found on a pull-out panel located in the control compartment.

Inspect Venting System

The appliance and venting system should be thoroughly inspected before initial use and at least annually by a qualiﬁed service technician (inspection should include ensuring that

exhaust or intake passages are unobstructed

and vent components are properly assembled and not damaged). Homeowner must contact

a qualiﬁed service technician at once if any abnormal condition is observed.

If the venting system is disassembled for any reason, a qualiﬁed service technician should follow vent installation instructions for proper reassembly and proper sealing of the venting system components. However, more frequent periodic inspections and cleanings should be performed by the homeowner.

Cleaning Glass

(see Front Glass Enclosure Panel, Removal and Installation on Page 11).

Note: Clean glass after ﬁrst two weeks of operation (after Burn-In period is over) and then only when necessary and when the ﬁreplace is cool. Wipe surface with clean, dampened, soft cloth. Follow with a dry, soft towel as desired. Take care not to scratch the glass surface.

IMPORTANT: Do not use abrasive cleaners on glass. Never clean the glass when it is hot.

The viewing glass should be cleaned periodically to remove any build-up caused from the following:

• During start-up, it is normal for condensation to form on the inside of the glass (this condensation and fog will usually disappear in a few minutes). The moisture can cause lint, dust and other airborne particles to cling to the glass surface.

• Initial curing of the high temperature paint

and burning off of lubricants used in the manufacturing process may result in a ﬁlm on the glass.

• A white coating may form on the glass as

a result of impurities and minerals in the fuel.

It is recommended that the glass be cleaned two or three times during each heating season, depending on the circumstances present. The following cleaning solutions are approved for use to clean glass:

• Non-ammonia based household cleaner

• 50%-50% mix of white vinegar and water

• Gas replace/stove glass cleaner

Inspect Glass Gasket - Visually inspect the

gasket on the backside of the glass enclosure panels. The gasket surface must be clean, free

of irregularities and seated ﬁrmly.

Clean Control Compartment

Keep control compartment clean by vacuuming

or brushing at least twice a year. More frequent

cleaning may be required due to excessive lint from carpeting, bedding materials, etc. It is important that control compartments, burners and circulating air passageways of the appliance

be kept clean.

Clean Logs And Burner

Carefully remove the logs (use care when handling the ﬁber logs, as they become quite fragile after curing). Vacuum out any foreign matter (lint, carbon, etc.) on the burner. Ensure the burner ports are “open.” Remove any carbon deposits from the under side of the logs using a vacuum cleaner, or a soft bristled brush (e.g., paint brush).

Replacing Logs

If the logs become damaged by accident or improper handling and need replacement, use only the proper replacement logs from manufacturer (see Pages 28 and 29 for ordering information).

Reinstall Embers and Logs

Carefully follow placement instructions on Pages 12 through 14. All logs should ﬁt onto corresponding pins and/or log stoppers. This will ensure a proper ﬂame and safe combustion.

Inspect Wiring

Refer to wiring diagrams on Page 17.

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

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.

Inspect and clean all wire connections. Ensure that there is no melting or damage. Inspection should include:

• Terminals at the Valve

• OFF/ON Switch

• (Optional Control Switch) Wall Thermostat,

Remote Control or Remote Wall Switch Kit

Inspect Burner Flame Appearance

Ensure that the burner ﬂame appearance resembles the ﬂame shown in Figures 11 and

12 and as described in Flame Appearance and Sooting on Page 15. The Homeowner must

contact a qualiﬁed service technician at once if any abnormal condition is observed.

Small Area Paint Touch-up

Only use a factory supplied paint kit for touch-

ups. Paint is available at your local authorized Lennox Hearth Products dealer. Never attempt to paint a hot ﬁreplace.

If the surface later becomes stained or marred, it may be lightly sanded and touched up with spray paint.

Note: Improper positioning of logs can create carbon build-up and will alter the performance of the appliance.

Page 11

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

Front Glass Enclosure Panel, Removal and Installation

WARNING

• Do not attempt to substitute the

materials used on this door, or replace cracked or broken glass.

• Handle this glass with extreme

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

• The glass door(s) of this appli-

ance 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.

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.

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.

These are direct-vent appliances. They are designed to operate only when the front glass enclosure panels are installed. Generally the front glass enclosure panel should not be removed except to gain access to the components within the ﬁrebox.

Removing the Glass Enclosure Panel

1. Open the lower control compartment door

(Page 8).

2. Locate the two (2) latches (Figure 5) at

the top of the control compartment and disengage them from the door frame bottom vee-ﬂange.

3. Pull the bottom of the door out a few

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

4. Set the glass enclosure panel aside in a

safe place for later reinstallation.

Installing the Glass Enclosure Panel

1. Retrieve the glass enclosure panel. Visually

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

irregularities and seated ﬁrmly.

2. Position the door in front of the ﬁrebox

opening with the bottom of the door held away from the ﬁreplace at a 45° angle

(Figure 6). Hook the top ange of the door

frame over the top of the ﬁrebox frame.

3. Let the bottom of the door frame swing

gently in towards the ﬁreplace ensuring

that the gasket seats evenly as the door

frame draws shut. Fasten the two latches located underneath the ﬁrebox ﬂoor to the door's vee-ﬂange. Close both the latches securely.

4. Reinstall the control compartment door

(Page 8).

5. If the hood was uninstalled, reinstall the

required hood. Note the location of the three clips inside the top air channel above the door. The clips are equally spaced on the top surface of the air channel opening. Use a screwdriver to open the clips

slightly if needed. Engage the back edge of

the hood into the clips to secure.

Hood

Glass Door

Control

Compartment

Panel

Spring Latch

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Note: When installing the glass door, ensure the spacing on both sides are equal.

Figure 6: Installing and Removing the

Glass Door

Page 12

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

INSTALL VOLCANIC STONE, GLOWING EMBERS, AND LOGS

NOTE: Turn off all electricity to the appliance and install the optional ﬁrebox liner, if applicable, before you install volcanic stone, embers, and logs.

1. Remove the front glass enclosure panel

(see Removing Glass Enclosure Panels on Page 11).

2. Always handle logs carefully to prevent breakage.

3. Install decorative volcanic stone - Sprinkle

the decorative volcanic stone in a pleasing pattern (see Figure 7). The volcanic stone should be placed directly on top of the ﬁrebox

bottom, along the slope and to the back at

the right and left sides of the burner. Position any ceramic ﬁber liners before placing the stone. Logs can be positioned after the volcanic stone.

NOTE: Do not place stone on the burner.

Volcanic Stone

Place Volcanic Stone As Shown

Figure 7

4. Placement of Glowing Embers -

Separate the Embers (rockwool) into pieces

about the size of a quarter (see Figure 8). Keep the pieces ﬂuffed up, not matted. Distribute these pieces over the surface of the burner, as shown in Figures 9 and 10. Do not use more than is necessary. Ensure that

the large burner slots remain uncovered by the ember material. Position the embers

on the small holes of the ember bed area.

Note: This appliance is provided with enough

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

5. Placement of Logs -

The logs have locating notches or slots to

help ensure that they are properly positioned. The top logs that rest on lower logs, do so over notches, indents or nubs. Proper log placement is critical to prevent sooting. Logs should be placed in the gaps between

the ame peaks and should be positioned

so they do not impinge the ﬂames. Follow

the log placement instructions, exactly.

Glowing Embers

Separate into Quarter

Size (separate) Pieces

Bag of Glowing

Embers (rockwool)

Figure 8

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

Carefully position the ceramic ﬁber logs over the burner as shown in Figure 9. Logs should be placed in the order shown and per the following instructions.

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

on the left rear log bracket.

2. Place the left front log (2) as shown. Position

it against the left front of the log rack.

3. Place the right front log (3) as shown. Position it against the right front of the log

rack.

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

the log resting on the log rack.

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

rear of the log over the right rear bracket.

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

Carefully position the ceramic ﬁber logs over the burner as shown in Figure 10. Logs should be placed in the order shown and per the following instructions.

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

on the left rear log bracket.

2. Place the left front log (2) as shown. Position

it against the left front of the log rack.

3. Place the right front log (3) as shown. Position it against the right front of the log

rack.

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

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

rear of the log over the right rear bracket.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

WARNINGS

• DO NOT attempt to install the

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

• The size and position of the log

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

• Logs get very hot and will

remain hot up to one hour after gas supply is turned off. Handle only when logs are cool. Turn off all electricity to the appliance before you

install grate, volcanic stone, embers and logs.

• This appliance is not designed

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

• If logs are not installed accord-

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

REFERENCE

Firebox Accessories / Parts

Cat. No. Model No. Description

88L53 FGE Bag of Glowing Embers

80L42 FDVS

Bag of Decorative Volcanic Stone

Page 13

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

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

Log

Number Description

1 Rear Log 2 Left Front Log 3 Right Front Log 4 Left Cross Log 5 Right Cross Log

Left Rear Log Bracket

Glowing Embers

(Do not place glowing embers over burner slots)

Step 1

Right Rear Log Bracket

Catalog Number for the entire log set:

Position the individual logs as shown below. Logs should be

placed in the order shown. Position the rear log on the brackets

at the rear of the ﬁrebox with the log’s notches directly over the

brackets.

Proper log and twig placement is critical to encourage outstanding ﬂame appearance and prevent sooting.

Log RackVolcanic Stone

Position against the left

side of the log rack

MLDVT-30: H7839 MLDVT-35: H7666

Position against the right

side of the log rack

Step 3

Position on the left

rear log bracket

Figure 9

Step 2

Right Rear Log Bracket

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Position on the right rear

log bracket

Position over rear log (1)

and against log rack

Step 4

Page 14

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

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

Log

Number Description

1 Rear Log 2 Left Front Log 3 Right Front Log 4 Left Cross Log 5 Right Cross Log

Position on the left

rear log bracket

(Do not place glowing embers over burner slots)

Glowing Embers

Step 1

Right Rear Log Bracket

Catalog Number for the entire log set:

Position the individual logs as shown below. Logs should be

placed in the order shown. Position the rear log on the brackets

at the rear of the ﬁrebox with the log’s notches directly over the

Log RackVolcanic Stone

brackets.

Proper log and twig placement is critical to encourage outstanding ﬂame appearance and prevent sooting.

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

the front resting on the log rack.

MLDVT-40: H7667 MLDVT-45: H7840

Step 3

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

Step 2

Figure 10

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Position on the right rear log

bracket and over log (3)

Step 4

Page 15

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

BURNER ADJUSTMENTS

(QUALIFIED TECHNICIANS ONLY)

Flame Appearance and Sooting

Proper ﬂame appearance is a ﬂame which is blue at the base and becomes yellowish-orange in the body of the ﬂame. When the appliance is ﬁrst lit, the entire ﬂame may be blue and will gradually turn yellowish-orange during the ﬁrst 15 minutes of operation. After 15 minutes of operation, if the ﬂame is blue, or if the ﬂame is

orange with evidence of sooting (black tip), the

air shutter opening may need to be adjusted.

If the air shutter opening is closed too far, sooting

may develop. Sooting is indicated by black puffs

developing at the tips of very long orange ﬂames.

Sooting results in black deposits forming on the

logs, appliance inside surfaces and on exterior surfaces adjacent to the vent termination.

Sooting is caused by incomplete combustion in

the ames and lack of combustion air entering

the air shutter opening. To achieve a warm yellowish-orange ﬂame with an orange body that does not soot, the shutter opening must be adjusted between these two extremes.

Figure 11: Burner Flame Appearance Models MLDVT-30 and MLDVT-35

Air Shutter Adjustment Guidelines

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

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

• The more offsets in the vent system, the larger

the air shutter opening will need to be.

• An appliance operated with the air shutter

opened too far, may have ﬂames that appear

blue and transparent. These weak, blue and

transparent ﬂames are termed anemic.

• Propane models may exhibit ames which

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

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

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

Figure 12: Burner Flame Appearance Models MLDVT-40 and MLDVT-45

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 16

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

Burner Air Shutter Adjustment Procedure

WARNINGS

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

• Ensure front glass panel are in place and sealed during adjustment.

CAUTIONS

• Soot willbeproduced ifthe

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

• The air shutter door and nearby

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

1. Locate adjustment rod and adjust air shutter

to the standard setting as shown in Figure 13 (adjustment rod is located in the lower

control compartment).

Note: Rotating the adjustment rod down

to decrease air and up to increase air.

2. Light appliance (follow lighting procedure on

lighting label in control compartment or see the lighting instructions, Pages 21 and 22 in this manual).

3. Allow the burner to operate for at least 15 min-

utes while observing the ﬂame continuously to ensure that the proper ﬂame appearance has been achieved (see Figure 11 or 12). If the following conditions are present, adjust accordingly.

• If ame appears weak or sooty, adjust the

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

• If ame stays lowered blue, adjust the air

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

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

ON position and the burner OFF/ON switch OFF (and remote switches, if applicable).

5. When satisﬁed that the burner ﬂame ap-

pearance is normal, close the lower control compartment door (see Figures 11 and 12 on Page 15).

Burner Air Shutter Adjustment

Adjustment Set-Screw

Adjustment Rod Up

Burner Tube

Air Shutter

Adjustment Rod Down (fully open air opening position)

Main Burner Factory Air Shutter

Opening Setting - Inches (millimeter)

Model Natural

Gas

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

Closed Closed Closed Closed

(closed min. position)

Propane

Gas

1/16 (1.574) 1/16 (1.574) 3/32 (2.362)

1/8 (3.175)

Figure 13

Millivolt Appliance Checkout

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

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

of the quick drop out thermocouple should be

engulfed in the pilot ﬂame. The ﬂame should project 1" (25 mm) beyond the hood at all three ports (see Figure 14).

To light the burner, refer to the lighting instructions on Page 21.

Proper Pilot Flame Appearance

Pilot Hood

Thermocouple

Pilot Nozzels

Thermopile

Igniter Rod

3/8" Min.

(9 mm)

Figure 14: Millivolt Pilot

Electronic Appliance Checkout

To light the burner, refer to the lighting instructions on Page 23. Ensure the igniter lights the pilot. The pilot ﬂame should engulf the ﬂame sensor as shown in Figure 15.

Ignitor

Pilot Hood

Sensor

Figure 15: Electronic Pilot

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 17

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

TP-TH

OPTIONAL APPLIANCEMOUNTED ON/OFF SWITCH

BK/W(1)

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

JUNCTION BOX

BLACK

120 V

WALL MOUNTED CONFIGURATION FOR FAN SWITCH (OPTIONAL)

WIRING DIAGRAM MILLIVOLT GAS VALVES

THERMOPILE

GAS VALVE

FAN

(OPTIONAL)

ORDERING REPLACEMENT PARTS

A complete parts list is found at the end of this manual. Use only parts supplied from the manufacturer.

With proper care and maintenance, your appliance will provide many years of enjoyment. If you should experience any problem, ﬁrst refer to the troubleshooting guide in this manual. If the problem persists, contact your Lennox Hearth Products dealer or distributor.

Order parts through your Lennox Hearth Products distributor or dealer. Parts will be shipped at prevailing prices at time of order.

When ordering parts, provide the following information:

1. Appliance model number

2. Appliance serial number

(On appliance label on control compartment floor)

3. Part number

4. Part description

5. Quantity required

6. Appliance installation date

If you encounter any problems or have any questions concerning the installation or application of this system, please contact your dealer or distributor.

Please call Lennox Hearth Products for the phone number of your nearest LHP dealer, who will answer your questions or address your concerns.

LENNOX HEARTH PRODUCTS

PRODUCT REFERENCE INFORMATION

We recommend that you record the important reference information about your ﬁreplace in

1508 Elm Hill Pike, Suite 108 Nashville, TN 37210

www.LennoxHearthProducts.com 1-800-655-2008

the space provided below.

PRODUCT REFERENCE INFORMATION

Model Number ________________________________________________________

Serial Number ________________________________________________________

Date Installed _________________________________________________________

Gas Type Used ________________________________________________________

Dealer Name _________________________________________________________

WIRING DIAGRAMS

Wiring diagrams are provided here for reference purposes only. This information is also provided on schematics attached directly to the appliance on a pullout panel located within the control compartment.

CAUTION: LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS APPLIANCE OPERATION.

JUNCTION BOX

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

120V AC

HOT

NEUTRAL

GROUND

LIMIT SWITCH

B-VENT MODELS

ONLY

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

SCHEMATIC REPRESENTATION ONLY

BATTERY HOLDER

AC/DC POWER ADAPTOR

ATTENTION : AU MOMENT DE L'ENTRETIEN DES COMMANDES, ÉTIQUETEZ TOUS LES FILS AVANT DE LES DÉBRANCHER. DES ERREURS DE CÁBLAGE PEU-VENT ENTRAÎNER UN FONCTIONNEMENT INADÉQUAT ET DANGEREUX.

ELECTRONIC PILOT ASSEMBLY

IGNITER ROD

G O

PROFLAME DFC BOARD

DFC WIRE HARNESS

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

PROFLAME VALVE

PILOT TUBE

SPARK WIRE CABLE

PILOT GROUND WIRE

HOOD

FLAME SENSOR

B PILOT SENSOR CABLE

Figure 16: Wiring Diagram, Millivolt Valve

Figure 17: Wiring Diagram, Electronic Valve

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 18

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

ACCESSORY COMPONENTS

Thermostatic Controls

Feature a thermostatic ON/OFF mode as well as manual ON/OFF operation.

RC-S-MODMV

Flame and heat modulation

• Thermostatic, manual, or up to 9-hour timer ON/OFF operation

• Wall clip included

• Solenoid for SIT millivolt valves

• Three fan speed settings

• Child lock

• Low battery indicator

• Batteries included

RC-S-STAT

Thermostatic or manual operation

• LCD display

• Receiver wall-mounted or placed in the

valve compartment

• Up to 9-hour countdown timer

• Child lock

• Low battery indicator

• Batteries included

RC-S-Touch

State-of-the-art control with touch screen operation

• Backlit LCD display

• Transmitter wall-mounted docking station

• Receiver wall-mounted or placed in the

control compartment

• Thermostatic or manual ON/OFF operation

• Programmable weekday/weekend modes

• Flame icon

• Low battery indicator

• Batteries included

WS-S-STAT

Wall Control

• Large LCD display

• Shows room and set temperatures in °F and °C

• Wall-mounted

• Thermostatic or manual ON/OFF operation

• Connects to wall switch wire

ON/OFF and Timer Controls

Feature a timed ON/OFF mode as well as manual ON/OFF operation.

G-Fire

Cost Effective Solution

• Manual ON/OFF operation

• Works with millivolt and low voltage electronic

ignition controls

• Kit includes remote and receiver

RC-S-1

Manual or up to 3-hour timer modes

• LCD display

• Shows room temperature in °F and °C

• Wall clip included

• Receiver wall-mounted or placed in the

control compartment

• White face plate included

• Flame icon

• Low battery indicator

• Batteries included

WS-S-TMR

Wall Control

• 4-button timer with 30/60/120/OFF minutes

• Wall-mounted

• Perfect for rental and resort applications

• Connects to wall switch wire

Unit-Mountable Rocker Switch

This rocker switch kit can be installed directly in the gas valve mounting bracket (millivolt gas valve

equipped ﬁreplaces) to provide On/Off operation in lieu of a wall switch.

Rocker Switch Kit

Cat. No. Model No. Description

80L41 FRS Rocker Switch Kit

OFF/ON Wall Switch Kit

The OFF/ON wall switch kit may be used to control

the operation of the ﬁreplace burner or blower. Install the OFF/ON wall switch in a convenient location near the ﬁreplace.

White Wall Switch Kit

Cat. No. Model No. Description

85L87 FWSK OFF/ON Wall Switch Kit

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Variable Speed Wall Switch

Provides variable speed control if optional blower

kit is purchased.

Variable Speed Wall Switch

Cat. No. Model No. Description

045571H VSWS Variable Speed Switch

Page 19

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

ACCESSORY COMPONENTS (continued)

Barrier Screen Panel Kit

This easy to install optional screen panel installs over the standard glass enclosure panel and provides a barrier to prevent direct contact with the hot glass surface. These screen panels cannot be used in conjunction

with the arch door kits or door frame kits.

Barrier Screen Panel Kits

Cat. No. Model No. Models Where Used

H6094 30MSKP MLDVT-30

H6095 35MSPK MLDVT-35

H3989 40LSPK MLDVT-40

H3990 45LSPK MLDVT-45

(ref. Instruction P/N 750042M)

Style View Screen Doors

Style View doors are easy to install, and do not require additional hardware. They install over the standard ﬁreplace glass door and provide a barrier to prevent direct contact with the hot glass surface. They include heavy-duty, magnetic door latches and functional twin-pane screen doors.

Arch Pane Square Pane

Arch Pane Style View Doors

Cat. No. Model No. Description For Models

H8529 APDML30C 30 in. Arch Pane Doors, Painted

H8530 APDML30SP 30 in. Arch Pane Doors, Satin Pewter

H8515 APDML35C 35 in. Arch Pane Doors, Painted

H8514 APDML35SP 35 in. Arch Pane Doors, Satin Pewter

H8512 APDML40C 40 in. Arch Pane Doors, Painted

H8513 APDML40SP 40 in. Arch Pane Doors, Satin Pewter

H8535 APDML45C 45 in. Arch Pane Doors, Painted

H8536 APDML45SP 45 in. Arch Pane Doors, Satin Pewter

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

Square Pane Style View Doors

Cat. No. Model No. Description For Models

H8531 SPDML30C 30 in. Square Pane Doors, Painted

H8532 SPDML30SP 30 in. Square Pane Doors, Satin Pewter

H8510 SPDML35C 35 in. Square Pane Doors, Painted

H8511 SPDML35SP 35 in. Square Pane Doors, Satin Pewter

H8516 SPDML40C 40 in. Square Pane Doors, Painted

H8517 SPDML40SP 40 in. Square Pane Doors, Satin Pewter

H8534 SPDML45C 45 in. Square Pane Doors, Painted

H8533 SPDML45SP 45 in. Square Pane Doors, Satin Pewter

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 20

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

ACCESSORY COMPONENTS (continued)

Touch-Up Paint Kit

Repair of minor scratches and discoloration of the

appliance black painted surfaces may be accomplished with the touch-up paint kit.

Touch-Up Paint Kits

(all models)

Cat. No. Model No. Description

90L73 FTPK-B Touch-Up Paint (Black)

(ref. Instruction P/N 750050M)

Termination Shroud

(ﬁts H1968)

(ref. Instruction P/N

750246M)

Deluxe Termination

Guard (ﬁts 94L10

and H1968)

(ref. Instruction P/N

750055M)

Square Termination

Guard (ﬁts 94L10

and H1968)

(ref. Instruction P/N

750109M)

Termination Guard Kits

The vent termination guards may be used to cover the vent termination on the exterior of the home to minimize exposure to the hot surface of the termination.

Brickaded Firebox Liner Kit

The brickaded liner kits include ceramic panels as shown here. The panels have brick-like features

in relief.

Brickaded Wall Liner Kits

Cat. No. Model No. Description

H7522 MBLPK-30B

H7525 MBLPK-35B

H7528 MBLPK-40B

H7531 MBLPK-45B

H7523 MBLPK-30R

H7526 MBLPK-35R

H7529 MBLPK-40R

H7532 MBLPK-45R

H7524 MBLPK-30H

H7527 MBLPK-35H

H7530 MBLPK-40H

H7533 MBLPK-45H

(ref. Instruction P/N 750248M)

Brick Liner Kit, Buff MLDVT-30

Brick Liner Kit, Buff MLDVT-35

Brick Liner Kit, Buff MLDVT-40

Brick Liner Kit, Buff MLDVT-45

Brick Liner Kit, Red MLDVT-30

Brick Liner Kit, Red MLDVT-35

Brick Liner Kit, Red MLDVT-40

Brick Liner Kit, Red MLDVT-45

Brick Liner Kit, Herringbone MLDVT-30

Brick Liner Kit, Herringbone MLDVT-35

Brick Liner Kit, Herringbone MLDVT-40

Brick Liner Kit, Herringbone MLDVT-45

Forced Air Kit

The FBK-100 blower provides constant velocity forced air circulation. The FBK-200 assembly with variable speed, wall-mountable switch provides variable speed forced air circulation. The FBK-300 offers variable speed control and a heat-activated switch; perfect for ﬁreplaces controlled thermostatically.

Forced Air Blower Kits

Cat.

Model No. Description

No.

80L84 FBK-100 Blower, Standard

80L85 FBK-200 Blower, Variable Speed

H7841 FBK-300 Blower, Variable Speed

(ref. Instruction P/Ns 750028M and 506019-51)

(single speed)

(w/wall-mounted switch)

(w/thermal snap switch)

The following kits are for use with replaces with a

factory-installed blower.

Forced Air Blower Kits, Factory-Installed Blower

Cat.

Model No. Description

No.

H8976 FBK2 Variable Speed

H8975 FBK3 Variable Speed

(w/wall-mounted switch)

(w/thermo snap switch)

Bag of Glowing Embers Bag of Volcanic Stone

Replacement ember materials or volcanic stone are

available for use with these appliances. Order kits as

part of the periodic maintenance of the appliance.

Decorative Firebox Accessories

(all models)

Cat. No. Model No. Description

88L53 FGE Bag of Glowing Embers

80L42 FDVS

(ref. FDVS Instruction P/N 750010M)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Bag of Decorative Volcanic Stone

Termination Guard Kits

(all models)

Cat. No. Model No. Description

H5820 4.5HTSK Termination Shroud

87L02 SV4.5HGS Termination Guard,

Deluxe

17M52 SV4.5HGS-1 Termination Guard,

Square

Page 21

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

LIGHTING INSTRUCTIONS – MILLIVOLT GAS VALVE

FOR YOUR SAFETY, READ BEFORE LIGHTING

WARNING: If you do not follow these instructions exactly, a fire or explosion may result, causing property damage, personal injury, or loss of life.

A. This appliance has a pilot that must be lighted by a piezo

igniter. When lighting the pilot, follow these instructions exactly.

B. BEFORE LIGHTING, smell all around the appliance area for

gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS:

• Donottrytolightanyappliance.

• Donottouchanyelectric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.

C. Use only your hand to push in or turn the gas control knob.

Never use tools. If the knob will not push in or turn by hand, don’t try to repair it; call a qualified service technician. Forced or attempted repair may result in a fire or explosion.

D. Do not use this appliance if any part has been under water.

Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control that has been under water.

LIGHTING INSTRUCTIONS

1. STOP! Read the safety information above on this label.

2. (If applicable) Set the thermostat to lowest setting. Turn wall on/off switch, unit mounted on/off switch or remote control switch “OFF.”

3. Turn OFF all electric power to the appliance.

4. Access the control compartment.

5. Push in gas control knob slightly and turn clockwise to “OFF.”

NOTE: Knob cannot be turned from “PILOT” to “OFF” unless knob is

pushed in slightly. Do Not force.

6. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP! Follow "B" in the safety information above on this label. If you don't smell gas, go to the next step.

7. Find pilot — located in firebox on the same plane as the top of the burner.

8. Turn knob on gas control counterclockwise to “PILOT.”

9. Push in control knob all the way and hold in. Immediately light the pilot by triggering the piezo igniter (pushing the button) until pilot lights. Continue to hold the control knob in for about 1-1/2 minutes after the pilot is lit. Release knob and it will pop back up. Pilot should remain lit. If it goes out, repeat steps 5 through 9.

• Ifknob does not pop up whenreleased, stop andimmediately call

your service technician or gas supplier.

• Ifthepilotwill not stay lit after severaltries, turn thegas control

10. Turn gas control knob counterclockwise to “ON.”

11. Close control compartment.

12. (If applicable) Turn on all electrical power to the appliance.

13. (If applicable) Set thermostat to desired setting. Turn wall on/off switch, unit mounted on/off switch or remote control switch “ON.”

SIT

Robertshaw

Honeywell

knob to “OFF,” and call your service technician or gas supplier.

Gas Control Valves

OUT

Gas Control Knobs

Pilot Assemblies

TPTH TP TH

TO TURN OFF GAS TO APPLIANCE

1. (If applicable) Set the thermostat to lowest setting. Turn wall on/off switch, unit mounted on/off switch or remote control switch “OFF.”

2. Turn OFF all electric power to the appliance if service is to be performed.

3. Access the control compartment.

WARNING

HOT GLASS WILL CAUSE BURNS.

DO NOT TOUCH GLASS UNTIL COOLED.

NEVER ALLOW CHILDREN TO TOUCH GLASS.

P/N 62L2901_4

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

4. Push in gas control knob slightly and turn clockwise to “OFF.”

Do not force.

5. Close the main line gas shut-off valve.

6. Close control compartment.

Page 22

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

INSTRUCTIONS D’ALLUMAGE – VANNE GAZ MILLIVOLT

POUR PLUS DE SÉCURITÉ, LIRE AVANT D’ALLUMER

AVERTISSEMENT. Quiconque ne respecte pas à la lettre les instructions dans la présente notice risque de déclencher un incendie ou une explosion entraînant des dommages, des blessures ou la mort.

A.Cet appareil est muni d’une veilleuse qui doit être

• Appelezimmédiatement votre fournisseurdegaz depuis un

allumée avec un allumeur piézo-électrique. Respectez les instructions ci-dessous à la lettre.

B. AVANT L’ALLUMAGE: Avant d’allumer la veilleuse, reniflez

• Sivousnepouvezrejoindrelefournisseur,appelezleservice

C. Ne pousser ou tourner la manette d’admission du gaz qu’à la

tout autour de l’appareil pour déceler une odeur de gaz. Reniflez près du plancher, car certains gaz sont plus lourds que l’air et peuvent s’accumuler au niveau du sol.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :

• Nepastenterd’allumerd’appareil.

D. N’utilisez pas cet appareil s’il a été plongé dans l’eau, même

• Netouchezà aucuninterrupteur; ne pasvousservir des

téléphones se trouvant dans le bâtiment.

INSTRUCTIONS D’ALLUMAGE

1. ARRÊTEZ ! Lisez les instructions de sécurité sur la portion supérieure de cette étiquette.

2. (Si applicable) Réglez le thermostat à la température la plus basse. Tournez l’interrupteur murale, l’interrupteur sur l’unité ou le contrôle à distance à "OFF. "

3. Coupez l’alimentation électrique de l’appareil.

4. Accédez au compartiment de contrôle.

5. Enfoncez légèrement le bouton de réglage du gaz et tournez-le dans le sens des aiguilles d’une montre jusqu’à la position d’arrêt “OFF”.

Remarque: Il est impossible de tourner le bouton de “PILOT” à “OFF” à

moins qu’il ne soit légèrement enfoncé. Ne le forcez pas.

6. Attendre cinq (5) minutes pour laisser échapper tout le gaz. Reniflez tout autour de l’appareil, y compris près du plancher, pour déceler une odeur de gaz. Si vous sentez une odeur de gaz, ARRÊTEZ ! Passez à l’étape B des instructions de sécurité sur la portion supérieure de cette étiquette. S’il n’y a pas d’odeur de gaz, passez à l’étape suivante.

7. Trouver le pilote –

Situé dans l’âtre sur la même surface que le dessus du

brûleur.

8. Tournez le bouton de contrôle sur la valve à gaz dans le sens antihoraire

vers "Pilote".

9. Enfoncez le bouton de réglage jusqu’au fond et gardez-le enfoncé. Allumez immédiatement la veilleuse en déclenchant l’allume-gaz à étincelle (en poussant le bouton) jusqu’à ce que la veilleuse s’enflamme. Continuez de tenir le bouton de réglage enfoncé pendant environ 90 secondes après l’allumage de la veilleuse. Relâchez le bouton et il sortira subitement. La veilleuse devrait rester allumée. Si

elle s’éteint, répétez les étapes 5 à 8

inclusivement.

10. Tournez le bouton de réglage du gaz en sens inverse des aiguilles d’une

11. Fermer le compartiment de contrôle.

12. (Si applicable) Mettez l’appareil sous tension.

13. (Si applicable) Réglez le thermostat à la température désirée.

voisin. Suivez les instructions du fournisseur.

des incendies.

main. Ne jamais employer d’outil à cette fin. Si la manette reste coincée, ne tentez pas de la réparer; appelez un technicien qualifié. Quiconque tente de forcer la manette ou de la réparer peut provoquer une explosion ou un incendie.

partiellement. Faites inspecter l’appareil par un technicien qualifié et remplacez toute partie du système de contrôle et toute commande qui ont été plongés dans l’eau.

• Sila manette ne se soulève pas d’elle-mêmelorsqu’on la relâche,

arrêter et appeler immédiatement un technicien qualifié ou le fournisseur de gaz.

• Si la veilleuse ne restepas allumée aprèsplusieurs tentatives,

réglez la manette d’admission du gaz à la position OFF et appelez un technicien qualifié ou le fournisseur de gaz.

montre jusqu’à sa position de marche “ON”.

l’interrupteur murale, l’interrupteur sur l’unité ou le contrôle à distance à "ON."

Vanne Gaz Millivolt

SIT

OUT

Bouton de réglage du gaz

Millivolt Pilot

TPTH TP TH

Robertshaw

Honeywell

Tournez

COMMENT COUPER L’ADMISSION DE GAZ DE L’APPAREIL

1. (Si applicable) Réglez le thermostat à la température la plus basse. Tournez l’interrupteur murale, l’interrupteur sur l’unité ou le contrôle à distance à "OFF. "

2. Coupez l’alimentation électrique de l’appareil s’il faut procéder à l’entretien.

3. Accédez au compartiment de contrôle.

AVERTISSEMENT

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.

P/N 62L3001_3

REMARQUE : LES SCHÉMAS ET LES ILLUSTRATIONS NE SONT PAS À L’ÉCHELLE

4. Enfoncez légèrement le bouton de réglage du gaz et tournez-le dans le sens des aiguilles d’une montre jusqu’à la position d’arrêt “OFF”. Ne forcez pas le bouton.

5. Fermer la valve de gaz principale.

6. Fermer le compartiment de contrôle.

Page 23

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

Electronic Pilot Assembly

Electronic Gas Control

LIGHTING INSTRUCTIONS—ELECTRONIC

FOR YOUR SAFETY, READ BEFORE OPERATING

WARNING: If you do not follow these instructions exactly, a fire or explosion may result, causing property damage, personal injury, or loss of life.

A. This appliance is equipped with an ignition device which

automatically lights the pilot. Do not try to light the pilot by hand.

B. BEFORE OPERATING smell all around the appliance area for

gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS:

•Donottrytolightanyappliance.

•Donottouchanyelectric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.

C. If any portion of this appliance does not operate as the

instructions indicate, do not try to repair it, call a qualified service technician. Do not use tools. Force or attempted repair may result in a fire or explosion.

D. Do not use this appliance if any part has been under water.

Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

OPERATING INSTRUCTIONS

1. STOP! Read the safety information above on this label.

2. Read the Care and Operation manual including the section on "Remote Control System," (if applicable).

3. Slide the switch on the receiver, wall switch or ON/OFF switch to "OFF."

4. Turn "OFF" all electric power to the appliance. Note: The control may have a battery backup (remove batteries, if installed).

5. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand.

6. Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow “B” in the safety information above on this page. If you do not smell gas, go to the next step.

7. Turn on all electric power to the appliance. Note: The control may have a battery backup (install batteries, if applicable).

8. Slide the switch on the receiver to REMOTE or ON/OFF switch / wall switch to ON.

9. (if applicable) Press ON/OFF button on remote control transmitter to "ON."

10. (if applicable) Set thermostat on remote control to desired setting.

11. If the appliance will not operate, follow the instructions "To Turn Off Gas To Appliance" and call your service technician or gas supplier.

Valve—SIT

P/N 580491-01, REV. 00

TO TURN OFF GAS TO APPLIANCE

1. Slide the switch on the receiver, wall switch or ON/OFF switch to "OFF.

2. (if applicable) Press ON/OFF button on remote control transmitter to "OFF."

WARNING

HOT GLASS WILL CAUSE BURNS.

DO NOT TOUCH GLASS UNTIL COOLED.

NEVER ALLOW CHILDREN TO TOUCH GLASS.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

3. Turn off all electric power to the appliance if service is to be performed. Note: The control may have a battery backup (remove batteries, if installed).

4. Close the main line gas shut-off valve.

Page 24

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

Valve électronique—SIT

INSTRUCTIONS D’ALLUMAGE—ELECTRONIC

POUR PLUS DE SÉCURITÉ, LIRE AVANT DE METTRE EN MARCHE

AVERTISSEMENT. Quiconque ne respecte pas à la lettre les instructions dans la présente notice risque de déclencher un incendie ou une explosion entraînant des dommages, des blessures ou la mort.

A. Cet appareil est muni d’un dispositif d’allumage qui allume

automatiquement la veilleuse. Ne tentez pas d’allumer la veilleuse manuellement.

B. AVANT DE FAIRE FONCTIONNER, reniflez tout autour de

l’appareil pour déceler une odeur de gaz. Reniflez près du plancher, car certains gaz sont plus lourds que l’air et peuvent s’accumuler au niveau du sol.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :

•Nepastenterd’allumerd’appareil.

•Ne touchez àaucuninterrupteur; ne pasvousservir des

téléphones se trouvant dans le bâtiment.

•Appelez immédiatement votrefournisseurdegaz depuis un

voisin. Suivez les instructions du fournisseur.

•Sivousnepouvezrejoindre le fournisseur,appelezleservice

des incendies.

C. Si un élément de cette unité ne fonctionne pas tel que décrit

dans les instructions, n’essayez pas de le réparer, appelez un technicien qualifié. N’utilisez-pas d’outils. Le fait de forcer la manette ou de la réparer peut déclencher une explosion ou un incendie.

D. N’utilisez pas cet appareil s’il a été plongé dans l’eau, même

partiellement. Faites inspecter l’appareil par un technicien qualifié et remplacez toute partie du système de contrôle et toute commande qui ont été plongés dans l’eau.

INSTRUCTIONS DE MISE EN MARCHE

1. ARRÊTEZ ! Lisez les avertissements de sécurité à l’endos de cette étiquette.

2. Lisez le manuel d’utilisation et d’entretien incluant la section « Système de télécommande » (si applicable).

3. Placez l’interrupteur mural ou "on/off" en position "off."

4. Coupez l’alimentation électrique de l’appareil. Note: Le contrôleur peut avoir une batterie de secours (retirer les batteries au besoin).

5. Cet appareil est muni d’un dispositif d’allumage qui allume automatiquement la veilleuse. Ne tentez pas d’allumer la veilleuse manuellement.

6. Attendre cinq (5) minutes** pour laisser échapper tout le gaz. Reniflez tout autour de l’appareil, y compris près du plancher, pour déceler une odeur de gaz. Si vous sentez une odeur de gaz, ARRÊTEZ ! Passez à l’étape B des instructions de sécurité sur la portion supérieure (à gauche) de cette étiquette. S’il n’y a pas d’odeur de gaz, passez à l’étape suivante.

7. Mettez l’appareil sous tension. Note: Le contrôleur peut avoir une batterie de secours (installer les batteries au besoin).

8. Placez l’interrupteur du récepteur en position “REMOTE” (ou l’interrupteur mural en position ON).

9. (Si applicable) Appuyez sur le bouton “ON/OFF” pour sélectionner “ON”.

10. (Si applicable) Ajustez le thermostat sur la télécommande à l’ajustement désiré.

11. Si l’appareil ne se met pas en marche, suivez les instructions intitulées « Comment couper l’admission de gaz de l’appareil » et appelez un technicien qualifié ou le fournisseur de gaz.

Module de veilleuse

électronique

P/N 580456-01, REV. 00

COMMENT COUPER L’ADMISSION DE GAZ DE L’APPAREIL

1. Placez l’interrupteur mural ou "on/off" en position "off."

2. (Si applicable) Sélectionnez OFF sur le récepteur.

AVERTISSEMENT

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.

REMARQUE : LES SCHÉMAS ET LES ILLUSTRATIONS NE SONT PAS À L’ÉCHELLE

3. Coupez l’alimentation électrique de l’appareil s’il faut procéder à l’entretien. Note: Le contrôleur peut avoir une batterie de secours (retirer les batteries au besoin).

4. Fermer la valve de gaz principale.

Page 25

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

MAINTENANCE SCHEDULE Turn off gas and electrical power to the ﬁreplace and allow it to cool before cleaning or servicing the appliance.

Annually (Before the onset of the Burning Season)

MAINTENANCE TASK PERFORMED BY PROCEDURE

Inspect/Clean Burner, Logs and Controls

Check Flame Patterns and Flame Height Qualiﬁed Service Technician

Inspect/Clean Pilot and Burner Qualiﬁed Service Technician

Check Vent System Qualiﬁed Service Technician Inspect the vent system at the top and at the base (within the

Appliance Checkout Qualiﬁed Service Technician Perform the appropriate appliance checkout procedure detailed

Replace Glowing Embers Homeowner / Qualiﬁed Service

Qualiﬁed Service Technician Inspect valve and ensure it is properly operating. Check piping

for leaks. Vacuum the control compartment, replace logs and

burner area.

Refer to Figure 11 (MLDVT-35), Figure 12 (MLDVT-40) on Page 15 and verify the ﬂame pattern and height displayed by the appliance conforms to the picture. Flames must not impinge on the logs. Ensure ﬂames are steady (not lifting or ﬂoating).

Refer to Figure 14 (SIT Millivolt) or Figure 15 (Electronic) on Page 16. Remove any surface build-up on pilot and burner assembly. Wipe the pilot nozzles, igniter/ﬂame rod and hood. Ensure the pilot ﬂame engulfs the ﬂame sensor as shown.

rebox) for signs of blockage or obstruction. Look for any signs

of dislocation or deterioration of the vent components (reconnect or replace as necessary). Note: Excessive condensation

can cause corrosion of caps, pipe and ﬁttings (excessive condensation can be caused by long lateral runs, too many elbows and/or exterior portions of the system being exposed to cold weather). Also inspect wall straps or plumbers's tape to ensure it is secure and in place.

in this manual.

Remove old ember materials (rockwool) and vacuum the ember

Technician

placement area. Place new embers as described and shown in

Figures 9 and 10.

Replace Batteries Homeowner / Qualiﬁed Service

Technician

Periodically (After the Burning Season)

For electronic valve models, replace the batteries in the remote control and in the battery holder.

MAINTENANCE TASK PERFORMED BY PROCEDURE

Clean Firebox Interior Homeowner Carefully remove logs, glowing embers and volcanic stone.

Vacuum out interior of the ﬁrebox. Clean ﬁrebox walls and log grate. Replace logs, glowing embers, and volcanic stone as detailed in this manual.

Check Flame Patterns and Flame Height Homeowner

Check Vent System Homeowner Inspect the vent system at the top and at the base (within the

Clean Front Glass Enclosure Panel Homeowner Clean as necessary following the directions provided in this

Refer to Figures 11 (MLDVT-35) and 12 (MLDVT-40) on Page 15 and verify the ﬂame pattern and height displayed by the appliance conforms to the picture. Flames must not impinge on the logs.

rebox) for signs of blockage or obstruction. Look for any signs

of dislocation of the vent components (reconnect or replace as necessary).

manual. DO NOT TOUCH OR ATTEMPT TO CLEAN GLASS

WHILE HOT.

Page 26

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

TROUBLESHOOTING GUIDE: MILLIVOLT GAS CONTROL SYSTEM Note: Before troubleshooting the gas control system, make sure the external gas shut off valve (located at gas supply inlet) is in the

“ON” position.

Note: Valve system troubleshooting should only be performed by a qualiﬁed service technician.

SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION

1. Spark igniter will

not light pilot after repeated triggering of igniter button.

WARNING: if the

pilot will not light after 1 minute of attempting, wait for at least 5 minutes for gas to clear before attempting again.

A. Defective igniter

(no spark at electrode).

B. Defective or misaligned

electrode at pilot (spark at

electrode).

C. Gas supply pressure

errant.

D. Pilot oriﬁce plugged.

Check for spark at electrode and pilot; if no spark and electrode wire is properly

connected, replace igniter. Using a match, light pilot. If pilot lights, turn off pilot and trigger the igniter button

again. If pilot lights, an improper gas mixture caused the bad lighting and a longer

purge period is recommended. If pilot will not light – check gap at electrode and pilot – should be 1/8" to have a strong spark. If gap measures 1/8", replace pilot (see

Figure 14 on Page 16).

Check inlet gas pressure. It should be within the limits as marked on the rating plate.

Clean or replace pilot oriﬁce.

2. Pilot will not stay

lit after carefully following the lighting instructions.

3. Pilot burning, no

gas to burner, Valve

knob “ON,” and the

(standard) burner OFF/ON switch is “ON."

NOTE: If an optional*

remote switch is used for burner operation, if the standard burner OFF/ON switch is still installed on appliance it must be in the "OFF" position.

4. Frequent pilot/burner

outage problem.

* Optional remote switch kits—wall switch, wall thermostat or remote control.

A. Defective pilot generator

(thermocouple).

A. Wall switch or wires

defective.

B. Thermopile may not be

generating sufﬁcient millivolts.

C. Plugged burner oriﬁce. D. OFF/ON Switch and

*Remote Switch are in the "ON" position resulting in excessive resistance.

A. Pilot ﬂame may be too low

or blowing (high) causing the pilot/valve safety to drop out.

Check pilot ame, it must impinge on thermocouple (see Figure 14 on Page 16). Clean and/or adjust pilot for maximum ﬂame impingement on thermocouple. Ensure that the connection between the valve and thermocouple are tight and secure.

Check wall switch and wires for proper connections. Jumper wire across terminals at wall switch, if burner comes on, replace defective wall switch. If okay, jumper wires

across wall switch wires at valve, if burner comes on, wires are faulty or connections are bad.

Check thermopile with millivolt meter. Take reading at thermopile terminals of gas

valve. Should read 325 millivolts minimum with optional wall switch “OFF.” Replace faulty thermopile if reading is below speciﬁed minimum.

Check burner orice for blockage and remove.

When turning on the burner using a *remote switch, ensure that the standard OFF/ON switch is in the "OFF" position. If both switches are in the ON position, it may result in excessive resistance (and millivolt drainage) and the burner may not come on.

Clean and/or adjust pilot ﬂame for maximum ﬂame impingement on thermocouple (see Figure 14 on Page 16).

Page 27

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

TROUBLESHOOTING GUIDE: ELECTRONIC GAS CONTROL SYSTEM Note: Before troubleshooting the gas control system, make sure the external gas shut off valve (located at gas supply inlet) is in the

“ON” position.

Note: Valve system troubleshooting should only be performed by a qualiﬁed service technician.

SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION

1. Nothing happens

when the ﬁreplace is turned ON/OFF.

2. The main burner

does not light and the igniter is

sparking.

A. Remote control system is

not functioning properly.

B. Unit is not receiving power.

C. Gas is not reaching the

ﬁreplace.

A. Gas is not reaching the

ﬁreplace.

B. Unit is not receiving power.

To use the remote control system, the wall switch plate must be set to REMOTE. Manually operate the replace using the wall switch (ON/OFF).

Replace the batteries in the handheld remote and/or behind the wall switchplate.

Check/replace batteries behind the wall switchplate. Replace unit battery backup. Check building circuit breakers to ensure power is on to the replace. Check the gas supply and gas shutoff valves (call a service technician, if required).*

Check the gas supply and gas shutoff valves (call a service technician, if required).*

Replace unit battery backup.

3. The burner lights,

then immediately goes out.

4. Soot is present on

the glass and panels.

5. Poor ﬂame and/or

blue ﬂame.

C. Loose wires to the valve. D. Loose wires to ignition

module.

E. Air in the gas line. A. Gas is not reaching the

ﬁreplace.

B. Loose wires to the valve

or ignition module.

C. Pilot ﬂame is not engulﬁng

the sensor.

D. Obstructed vent system. A. Initial ﬁreplace operation.

B. Excessive ﬂame

impingement on panels and ﬁreplace ceiling.

C. Improper air shutter

opening.

D. Improper vent restrictor

setting.

A. Door seal is not properly

aligned, causing gaps and

air leaks.

Check control compartment for any obvious loose wiring (call a service technician). Check control compartment for any obvious loose wiring (call a service technician).

Purge gas line of air (call a service technician).

Check the gas supply and gas shutoff valves (call a service technician, if required).*

Call a service technician.

Call a service technician. A white ﬁlm may develop on the glass during the ﬁrst few ﬁres as part of the burn-in

process.

The ﬁrst few times you use the ﬁreplace, clean the glass after each use (AFTER THE GLASS HAS COMPLETELY COOLED); otherwise, the white ﬁlm will bake onto

the glass and become difﬁcult to remove.

See glass cleaning instructions in the MAINTENANCE section of this manual. Properly position the media as detailed in the instructions provided with the Media Kit.

Open the air shutter by adjusting the air shutter adjustment lever according to the instructions in this manual.

Remove and realign the door so the gasket seal is fully engaged around the door

frame.

*The unit may have multiple gas supply shutoffs (the main gas supply valve in the house, the gas supply valve in the ﬁreplace control compartment, and/or an additional shutoff valve near the ﬁreplace).

Page 28

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

REPLACEMENT PARTS LIST

Item No. Description MLDVT-30 MLDVT-35 MLDVT-40 MLDVT-45

Part No. Qty. Part No. Qty. Part No. Qty. Part No. Qty. 1 Hood H7568 1 H7266 1 H7267 1 H7569 1 2 Lower Control Compartment Panel H8936 1 3 Enclosure, Glass Front (Complete) H7560 1 H7264 1 H7265 1 H7561 1 4 Door Latch Spring H1264 2 H1264 2 H1264 2 H1264 2

5 Log Set (Complete) H7839 1 H7666 1 H7667 1 H7840 1 6 Burner Assembly H7717 1 H7717 1 H7718 1 H7718 1 7 Oriﬁce, Main Burner - Natural Gas H4873 1 H1355 1 60J80 1 37L70 1 7 Oriﬁce, Main Burner - Propane Gas H7838 1 75L10 1 19L52 1 99K79 1 8 Bag of Glowing Embers (Rockwool) 88L53 1 88L53 1 88L53 1 88L53 1 8 Bag of Decorative Volcanic Stone 80L42 1 80L42 1 80L42 1 80L42 1 9 Oriﬁce Holder H7257 1 H7257 1 H7257 1 H7257 1

10 Gas Line Flexible Connector 93L32 1 93L32 1 93L32 1 93L32 1 11 Grate H7719 1 H7719 1 H7720 1 H7720 1 12 Sub-Floor H7558 1 H7450 1 H7462 1 H7741 1 13 Flex Oriﬁce/Manifold Connector Tube, 9 in. H7257 1 H7257 1 H7257 1 H7257 1

H8937

H8938

1 H8939 1

Gas Controls - SIT Millivolt

Item

Description Natural Gas Propane Gas

No.

14 Gas Valve, SIT H6209 1 88J53 1 15 Piezo Igniter 10K86 1 10K86 1 16 Piezo Igniter Wire 56L21 1 56L21 1 17 Pilot Assembly 69L17 1 69L18 1 18 Pilot Generator 60J79 1 60J79 1 19 Thermocouple 74L57 1 74L57 1 20 Pilot Tube 74L56 1 74L56 1 21 Electrode and Cable H6212 1 H6212 1

Part No. Qty. Part No. Qty.

Gas Controls - SIT Electronic

Item

Description Part No. Qty.

No.

22 Gas Valve, Natural Gas, SIT H8844 1

22 Gas Valve, Propane, SIT H8594 1 23 Pilot Assembly, Natural Gas H7268 1 23 Pilot Assembly, Propane H7269 1 24 Digital Flame Control Module H7272 1 25 Battery Holder H8803 1 26 Wiring Harness, Digital Flame Control H8601 1 27 Transformer H8006 1 28 CPI ON/OFF Switch 27K30 1

Contact an Authorized Lennox Hearth Products dealer to obtain any of these parts. Never use substitute materials. Use of non-approved parts can result in poor performance and safety hazards.

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.

Page 29

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

REPLACEMENT PARTS

SIT Electronic Valve

Components

SIT Gas

Controls

(Ref.)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Page 30

LENNOX HEARTH PRODUCTS • MERIT® SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • CARE AND OPERATION 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 506017-09 Rev. A 04/2013

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

Lennox MLDVT-40NM-FB, MLDVT-35NM-FB, MLDVT-45NM, MLDVT-30PM, MLDVT-35PM Care And Operation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual