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

...

Download

CARE AND OPERATION INSTRUCTIONS

▪

See Page 2 For Details

▪

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 506017-01 Rev. E 06/2011

This manual is part of a set of two supporting this product. Refer to P/N 506015-02 for Installation Instructions.

Ce manuel est disponible en francais, simplement en faire la demande. Numéro de la pièce 506223-04.

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-30PM MLDVT-35NM MLDVT-35PM

Report No. 100326540PRT-001

MILLIVOLT:

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

™

ELECTRONIC:

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

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

•

FREE

severe burns and injuries by preventing direct contact

To receive your FREE SAFETY GUARD, call 1-800-786-7976

or visit www.lennox.com

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

Unit Shipping Weights/Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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

SAFETY GUARD

The Lennox® SAFETY GUARD protects against

with the front glass surface of your ﬁreplace.

(Lennox Hearth Products / Owner Resources)

OFFER

•

Safety and

Your Fireplace

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.

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.

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.

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 1-800-9-LENNOX

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

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

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

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

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

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

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

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

Étiquettes de remplacement, n° cat. H8024

LENNOX HEARTH PRODUCTS 1-800-9-LENNOX

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

COLOCACIÓN DE ADVERTENCIAS DE SEGURIDAD EN OPERACIÓN

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

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

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

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

Juego de etiquetas de repuesto - Nº de cat. H8024

LENNOX HEARTH PRODUCTS 1-800-9-LENNOX

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

Figure A

SAFETY LABEL

DIAGRAMS

DIAGRAMMES DES ÉTIQUETTES

DE SÉCURITÉ

Figure B

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

DIAGRAMAS DE ETIQUETAS

DE SEGURIDAD

Figure C

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

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 ZZ21.88 (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, or the Natural Gas and Propane Installation Code, CAN/CSA B149.1-latest edition. The appliance, when installed, must be electrically grounded in accordance with local codes or, in the absence of local codes, the latest edition of the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, CSA C22.1 - latest editions.

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 on Page 9). A 1/8" NPT Test gauge connection is provided at the inlet and outlet (manifold) ports on the electronic gas control valve (see 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

These appliances must be isolated from the gas supply piping system (by closing their individual manual shut-off valve) during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).

These appliances and their individual shut-off valves must be disconnected from the gas supply piping system during any pressure testing of that system at pressures greater than 1/2 psig (3.5

kPa).

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.

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:

To reinstall, insert the tabs on each side of the door into the corresponding holes in the control compartment opening, one side ﬁrst then the other. To close, pull the door gently up and close by pushing forward and pushing the top

edge down into the groves at the brackets until it locks 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

Gas Flex Line

Figure 1

Control Compartment Door Tab

Figure 2

Valve

Piezo

Lower Control

Compartment

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 gently lifting it upward and forwards. 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.

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

PILOT

OUT

VENT

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 direc-

tions. Check batteries, if installed, routinely

(ever three months).

TO LIGHT YOUR APPLIANCE IN A POWER

OUTAGE DO THE FOLLOWING:

•Installbatteriesinbatterypack.

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

to the ON Position.

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

•OperateNormally.

•Replacebatteriesifneeded.

•Afterpoweris restored,removebatter-

ies.

Main Gas Control Knob

Inlet Pressure Port

OUT

Manifold Pressure Port

Variable Flame Height Adjustment

Gas Inlet

Terminals TPTH, TP and TH

Figure 3 - SIT Millivolt Gas Valve

Supply Gas Inlet

Pressure-Tap (Manifold)

Regulator Mounting Screw

Burner Stage Terminal

Gas Outlet

Gas

Outlet

To Burner

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).

Note: It is recommended that batteries not be installed in the battery holder until a power outage, or if the appliance is to be operated solely with two (2) "D" batteries.

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

Pressure-Tap (Inlet)

Pilot Gas Outlet

Ground (TP)

Pilot Stage Terminal

Figure 4 - Dexen Electronic Gas Valve

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 opera- tion (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 (i.e. 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 order- ing 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.

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 Glass Enclosure Panels (see Figure 6)

1. To access the glass door securing latches,

ﬁrst open the lower control compartment door (Figure 6) by lifting and pulling the bottom panel forward.

2. Pull the latches forward and down to release

them from the door channel.

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

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

4. Retrieve the glass door. Visually inspect the

gasket on the backside of the frame. Gasket

surface must be clean, free of irregularities and seated ﬁrmly.

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

ing with the bottom of the door held away from the ﬁreplace (Figure 6). Hook the top ﬂange of the door frame over the top of the ﬁrebox frame.

6. 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.

7. If desired, install the optional hood. Note

the location of the three clips inside the top air channel above the door. The clips are equally spaced on the top surface of the air channel opening. Use a screwdriver to open the clips slightly if needed. Engage

the back edge of the eyebrow into the clips

to secure.

Header Spacing Top Standoffs

5/8” Nailing Flange

1/2” Nailing Flange

Glass Door

Glass Door Spring Latch

Control Compartment Panel

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

Hood

Flush Nailing Flange

Figure 6 -

INSTALLING OR REMOVING GLASS DOOR

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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 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.

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

on the small holes of the ember bed area.

Note: This appliance is provided with enough

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

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, vermiculite, 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

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)

Left Rear Log Bracket

Log Number Description

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

Catalog Number for the entire log set:

MLDVT-30: H7839 MLDVT-35: H7666

Right Rear Log Bracket

Position against the right

side of the log rack

Glowing Embers

(Do not place glowing embers over burner slots)

Step 1

Position on the left

rear log bracket

Figure 9

Step 2

Right Rear Log Bracket

Log RackVolcanic Stone

Position against the left

side of the log rack

Position on the right rear

log bracket

Step 3

Position over rear log (1) and against log rack

Step 4

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

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

Position on the left

rear log bracket

Log Number Description

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

Catalog Number for the entire log set:

MLDVT-40: H7667 MLDVT-45: H7840

Right Rear Log Bracket

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

the front resting on the log rack.

Glowing Embers

(Do not place glowing embers over burner slots)

Step 1

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

Step 2

Figure 10

Log RackVolcanic Stone

Step 3

Position on the right rear log

bracket and over log (3)

Step 4

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

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

ELECTRONIC

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)

(closed min. position)

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

Main Burner Factory Air Shutter

Opening Setting - Inches (millimeter)

Model Natural

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

(0.795 mm)

Gas

1/32"

Propane

Gas

1/8"

(3.2 mm)

1/8"

(3.2 mm)

1/4"

(6.4 mm)

3/16"

(4.8 mm)

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.

SIT MILLIVOLT PILOT ASSEMBLY

Proper Pilot Flame Appearance

Pilot Hood

Thermocouple

Pilot Nozzels

Thermopile

Igniter Rod

3/8" Min.

(9 mm)

Figure 14

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.

ELECTRONIC PILOT ASSEMBLY

Sensor

Igniter

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

Pilot Hood

Figure 15

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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)

JUNCTION BOX

120 VAC

TRANSFORMER 3V

INTERMITTENT ELECTRONIC WIRING DIAGRAM

BROWN

BLACK

BATTERY BACK-UP

TO WALL

SWITCH, FRS

OR THERMOSTAT

BLACK (SENSOR)

BLACK (IGNITER)

SPARK TO PILOT IGNITER

IGNITER MODULE

RED

OPTIONAL BLOWER SWITCH

FAN

(OPTIONAL)

PILOT

OUT

VENT

ORANGE (THTP)

BLACK (TP)

GREEN (TH)

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.

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

1508 Elm Hill Pike, Suite 108 Nashville, TN 37210 Visit us at www.Lennox.com 1-800-9-LENNOX

reference information about your ﬁreplace in 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.

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.

Figure 16

Figure 17

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

Unit Shipping Weights/Volumes

Cat.

No.

H7506 MLDVT-30NM 78 lb. 9.09 cu. ft.

H7507 MLDVT-30PM 78 lb. 9.09 cu. ft.

H7508 MLDVT-30NE 78 lb. 9.09 cu. ft.

H7511 MLDVT-35NM 86 lb. 10.61 cu. ft.

H7512 MLDVT-35PM 86 lb. 10.61 cu. ft.

H7515 MLDVT-35NE 86 lb. 10.61 cu. ft.

H7516 MLDVT-40NM 108 lb. 14.01 cu. ft.

H7517 MLDVT-40PM 108 lb. 14.01 cu. ft.

H7518 MLDVT-40NE 108 lb. 14.01 cu. ft.

H7519 MLDVT-45NM 122 lb. 15.76 cu. ft.

H7520 MLDVT-45PM 122 lb. 15.76 cu. ft.

H7521 MLDVT-45NE 122 lb. 15.76 cu. ft.

ACCESSORY COMPONENTS

Digital Wall Thermostat

The wall thermostat kit provides temperature control

for optimum comfort.

Cat. No. Model No. Description

H4635 DWTK Wall Thermostat Kit,

Model Ship.

Weight

Wall Thermostat, Millivolt

White

Ship.

Volume

Standard Remote Control System

The Model RCL (Standard) Remote Control System,

features a simplistic OFF/ON control function for the ﬁreplace. This model includes a hand-held transmitter, a remote receiver with wall-mount cover plate and all hardware required to install the unit. The remote receiver can be wall or hearth mounted.

The transmitter has ON and OFF functions that are activated by pressing either button on the face of the transmitter. When a button on the transmitter is pressed, a signal light illuminates brieﬂy to verify that a signal has been sent.

The Model RCL is designed to operate with all millivolt ignition systems, as well as electronic ignition systems. It may be installed with use for either natural gas or propane gas appliances. The RCL offers ease of installation and allows you to execute on-off commands to the ﬁreplace effortlessly with one simple motion.

The Model RCL comes complete with detailed operating instructions.

Remote Control Kit, Standard

Cat. No. Model No. Description

H0249 RCL Remote Control System

(Standard)

(ref. Instruction P/N 750127M)

Deluxe Remote Control System

The Model RCL-T (Deluxe) Remote Control System

has all of the features of the standard system along with an added easy to read LCD screen which presents access to many enhancements, including; battery power level indicator, timer, mode of operation, thermostatic display including room temperature in either metric of English units, ﬂame indicator and

clock. Fully programmable, the Model RCL-T allows

for virtual command over nearly all operational and temperature variables, using the hand held remote control transmitter.

The Model RCL-T (Deluxe) remote control system

is installed in the same manner as the standard system, may be operated with electronic and millivolt systems with either natural gas or propane gas. The RCL-T comes complete with detailed operating instructions.

Remote Control Kit, Deluxe

Cat. No. Model No. Description

H0251 RCL-STAT Remote Control System

(Deluxe)

(ref. Instruction P/N 750129M)

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

(ref. Instruction P/N 750037M)

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

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

ACCESSORY COMPONENTS (continued)

Pull Screen Panel Kit

This easy to install optional decorative screen kit

installs over the standard glass enclosure panel.

These screen kits cannot be used in conjunction with the arch door kits or door frame kits.

Cat. No. Model No. Models Where Used

H6112 PSFPKM30 MLDVT-30

H6113 PSFPKM35 MLDVT-35

H6114 PSFPKM40 MLDVT-40

H6115 PSFPKM45 MLDVT-45

Screen Panel Kits

Style View Screen Doors

These Style View doors are easy to install and will not require hardware to attach them to the standard glass door frame. The Style View door installs over the standard glass enclosure panel and provides a barrier to prevent direct contact with the hot glass surface. The door includes heavy duty magnet door latches and functional twin-pane screen doors.

Arch Pane Design

ARCH PANE DESIGN KITS

Cat. No. Model Description Model Series

APDML30C

H6104

APDML30SP

H6105

APDML35C

H6106

APDML35SP

H6107

APDML40C

H6108

H6109

APDML40SP

H6110

APDML45C

APDML45SP

H6111

(ref. Instruction P/N 750215M)

30” Arch Pane Door, Painted

30” Arch Pane Door, Satin Pewter

35” Arch Pane Door, Painted

35” Arch Pane Door, Satin Pewter

40” Arch Pane Door, Painted

40” Arch Pane Door, Satin Pewter

45” Arch Pane Door, Painted

45” Arch Pane Door, Satin Pewter

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

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)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Cat. No. Model

SPDML40C

H6096

SPDML40SP

H6097

H6098 SPDML35C

SPDML35SP

H6099

H6100 SPDML40C

SPDML40SP

H6101

SPDML45C

H6102

SPDML45SP

H6103

Square Pane Design

SQUARE PANE DESIGN KITS

Description Model Series

30” Square Pane Door, Painted

30” Square Pane Door, Satin Pewter

35” Square Pane Door, Painted

35” Square Pane Door, Satin Pewter

40” Square Pane Door, Painted

40” Square Pane Door, Satin Pewter

45” Square Pane Door, Painted

45” Square Pane Door, Satin Pewter

MLDVT-30

MLDVT-35

MLDVT-40

MLDVT-45

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 Panel 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

H7523 MBLPK-30B

H7525 MBLPK-35B

H7528 MBLPK-40B

H7531 MBLPK-45B

H7524 MBLPK-30R

H7526 MBLPK-35R

H7529 MBLPK-40R

H7532 MBLPK-45R

H7525 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.

Forced Air Blower Kits

Cat.

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)

Model No. Description

No.

(single speed)

(w/wall-mounted switch)

(w/thermal 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)

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

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

TPTH TP TH

OUT

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 which must be lighted with 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.

LIGHTING INSTRUCTIONS

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

2. Access the lower control compartment.

3. Turn remote wall switch to “OFF.”

4. Verify main line shut-off valve is open.

5. Push in gas control knob slightly and turn clockwise

to “OFF.”

6. Wait ﬁve (5) minutes to clear out any gas. Then smell for gas, includ-

7. Push in gas control knob slightly and turn

8. Push in control knob all the way and hold in.

• 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 depart-

ment.

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,

do not try to repair it, call a qualiﬁed service technician. Force or attempted repair may result in a ﬁre or an 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.

ing near the oor. If you smell gas, STOP! Follow “B” in the safety

information above (to the left) on this label. If you don’t smell gas, go to the next step.

counterclockwise to “PILOT.”

SIT

MILLIVOLT PILOT

Immediately light the pilot by triggering the

spark 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 8.

Note: Knob cannot be turned from “PILOT” to “OFF” unless the knob is pushed in slightly. Do not force.

1. Turn remote wall switch “OFF.” The pilot will remain lit for nor-

mal service.

2. For complete shutdown, turn remote wall switch to “OFF.”

3. Access the lower control compartment.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

your service technician or gas supplier.

• If pilot will not stay lit after several tries, turn the control knob to

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

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

10. Close lower control compartment.

11. If the appliance will not operate, follow the instructions "To Turn Off

Gas To Appliance" and call your service technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE

4. Depress gas control knob slightly and turn clockwise

to “OFF.” Do not force.

5. Close lower control compartment.

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

TPTH TP TH

OUT

INSTRUCTIONS D’ALLUMAGE – VANNE 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 allumée avec un

allumeur piézo-électrique. Lorsque vous allumez la veilleuse, suivre exactement ces instructions.

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

nes se trouvant dans le bâtiment.

INSTRUCTIONS D'ALLUMAGE

1. ARRÊTEZ ! Lisez les instructions de sécurité sur la portion su-

périeure de cette étiquette.

2. Ouvrez le compartiment de contrôle du bas.

3. Tournez l’interrupteur mural à la position d’arrêt “OFF”.

4. Assurez-vous que la soupape d’arrêt de la canalisation principale est

ouverte.

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”.

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

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

ment. 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.

8. 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.

• Si le bouton ne sort pas automatiquement après avoir été relâché,

arrêtez immédiatement et téléphonez à votre technicien de service ou à votre fournisseur de gaz.

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 (à gauche) de cette étiquette. S’il n’y a pas d’odeur de gaz, passez à l’étape suivante.

7. Enfoncez légèrement le bouton de réglage du gaz et tournez-le en

sens inverse des aiguilles d’une montre jusqu’à la position de veilleuse “PILOT”.

POUR FERMER LE GAZ QUI ALIMENTE L’APPAREIL

1. Tournez l’interrupteur mural à la position d’arrêt “OFF”. La veilleuse

restera allumée jusqu’au retour du service normal.

2. Pour une fermeture complète, tournez l’interrupteur mural à la posi-

tion d’arrêt “OFF”.

3. Ouvrez le compartiment de contrôle du bas.

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

• Si la veilleuse refuse de rester al-

lumée après plusieurs tentatives, tournez le bouton de réglage jusqu’à sa position d’arrêt “OFF” et téléphonez à votre technicien de service ou à votre fournisseur de gaz.

9. Tournez le bouton de réglage du gaz

en sens inverse des aiguilles d’une montre jusqu’à sa position de marche “ON”.

10. Fermez le compartiment de contrôle du bas.

11. Si l’appareil ne fonctionne pas, suivre les instructions intitulées

“Pour fermer le gaz qui alimente l’appareil” et appeler un technicien ou le fournisseur de gaz.

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. Fermez le compartiment de contrôle du bas.

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

PILOT

OUT

VENT

OPERATING 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.

OPERATING INSTRUCTIONS

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

2. Turn remote wall switch to “OFF" or set wall thermostat

to lowest setting. If used, remove the batteries from the battery holder.

3. This appliance is equipped with an ignition device which

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

4. Push the unit mounted "ON/OFF" switch to the "OFF" posi-

tion.

• 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 depart-

ment.

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.

6. Push the unit mounted "ON/OFF" switch back to the "ON"

position. (The "ON/OFF" switch may include a wall switch if so equipped). Replace the batteries in the battery holder, if used. If the burner does not light or stay lit after several tries, turn the unit mounted "ON/OFF" switch to the "OFF" position and call your service technician or gas supplier. NOTE: Sufﬁcient time must be allowed for air to escape from lines if the unit is being lit for the ﬁrst time.

7. Turn HI-LO burner control knob to desired setting and

close control door.

8. Set thermostat to desired setting if applicable.

9. If the appliance will not operate, follow the in-

structions "To Turn Off Gas To Appliance" and call your service technician or gas supplier.

TO SHUT OFF

5. Wait ﬁve (5) minutes to clear out any gas. Then smell

for gas, including near the oor. If you smell gas, STOP!

Follow “B” in the safety information above (to the left) on this label. If you don’t smell gas, go to the next step.

1. Turn off all electrical power to the appliance (remote wall

switch) or set the thermostat to the lowest setting, if applicable. Or remove batteries, if used.

TO TURN OFF GAS TO APPLIANCE

1. For complete shut-down, turn remote wall switch to “OFF"

or set the thermostat to the lowest setting, if applicable.

3. Turn off all electric power to the appliance and remove

backup batteries if service is to be performed or for

extended shutdown.

2. Turn the ON/OFF switch to “OFF”. If step 1 is not applicable.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

PILOT

OUT

VENT

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.

INSTRUCTIONS DE MISE EN MARCHE

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

supérieure (à gauche) de cette étiquette.

2. Tournez l interrupteur mural à distance à la position arrêt (OFF)

ou placez le thermostat à la plus basse température possible, si requis.

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

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

4. Tournez la manette de réglage du gaz à la position d’arrêt

“OFF”.

• 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.

6. Poussez le commutateur de l unité à la position marche (ON).

Le commutateur de l unité peut aussi être complémenté d un interrupteur mural. si le brûleur ne s allume pas ou ne reste pas allumeé après plusieurs essais, tournez le commutateur de l unité à la position arrêt (OFF) et appelez votre fournisseur de gaz ou votre technicien de service. Note : Si vous allumez l unité pour la premiére fois, vous devrez attendre un certain temps aﬁn que l air puisse s échapper des conduits.

7. Tournez le bouton de commande du brûleu HI-LO à la posi-

tion désirée et fremez la porte.

8. Ajustez le thermostat à la température désiré, si requis.

9. Si l appareil ne fonctionne pas, suivez les in-

structions Comment fermer le gaz qui alimente appareil et contactez votre fournisseur de gaz ou technicien de service.

5. Attendre cinq (5) minutes pour laisser échapper tout le gaz.

POUR ÉTEINDRE L’APPAREIL

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

1. Coupez le courant électrique qui alimente l appareil (interrupteur mural) ou placez le thermostat à la plus basse température, si requis.

d’odeur de gaz, passez à l’étape suivante.

COMMENT COUPER L’ADMISSION DE GAZ DE L’APPAREIL

1. Pour une fermeture compléte, tournez l'interrupteur mural à la position arrêt (OFF) ou placez le thermostat à la plus basse température.

3. Coupez l'alimentation électrique du foyer et retirez les batteries de sécurité si vous prévoyez faire le service de' appareil ou si vous ne l'utilisez pas à long terme.

2. Tournez le commutateur de l unité à la position arrêt (OFF) si l'étape l n est pas requise.

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

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 ACCOMPLISHING PERSON PROCEDURE

Inspect/Clean Burner, Logs and Controls

Check Flame Patterns and Flame

Height

Inspect/Clean Pilot and Burner Qualiﬁed Service Technician Refer to Figure 14 (SIT Millivolt) or Figure 15 (Electronic) on

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

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

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

burner area.

Qualiﬁed Service Technician 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).

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.

Replace Glowing Embers Homeowner/Qualiﬁed Service

Technician

Periodically (After the Burning Season)

Remove old ember materials (rockwool) and vacuum the ember

placement area. Place new embers as described and shown in

Figures 9 and 10.

MAINTENANCE TASK ACCOMPLISHING PERSON 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

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

Homeowner 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.

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

TROUBLESHOOTING THE MILLIVOLT CONTROL SYSTEM

Note: Before troubleshooting the gas control system, make sure the external gas shut off valve, located at gas supply inlet,

(and wall switch, if applicable), is in the “ON” position.

Important: 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.

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." Read important note below.

IMPORTANT NOTE: If an optional

*remote switch is used for burner operation, the unit-mounted burner OFF/ON switch (if installed) must be in the "OFF" position.

*Optional remote switch kits - wall

switch, wall thermostat or remote control.

4. Frequent pilot/burner outage

problem.

A. Defective igniter

(no spark at electrode).

B. Defective or misaligned electrode at pilot

(spark at electrode).

C. Gas supply pressure errant. Check inlet gas pressure. It should be within the limits

D. Pilot oriﬁce plugged. Clean or replace pilot oriﬁce. A. Defective pilot generator

(thermocouple).

A. Wall switch or wires defective. Check wall switch and wires for proper connections.

B. Thermopile may not be generating suf-

ﬁcient millivolts.

C. Plugged burner oriﬁce. Check burner orice for blockage and remove. 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 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 (igniter rod) and pilot. It should be 1/8" to have a strong spark. If gap does not

measure 1/8", replace pilot (see Figure 14 on Page 16).

as marked on the rating plate.

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.

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.

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).

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

TROUBLESHOOTING THE ELECTRONIC IGNITION SYSTEM

Note: Before troubleshooting, make sure the appliance main line gas shut-off valve, the gas control valve, and the wall

switch are in the “ON” position.

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

SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION

1. Nothing happens when

ON/OFF switch is turned

on (pilot does not spark).

2. The main burner does not light and the igniter

is sparking.

3. The main burner comes "ON" but then goes "OFF".

A. Low voltage/or bad lead

wires.

B. Damaged igniter wire.

C. Damaged pilot assembly.

D. Batteries Low

A. No fuel supply.

B. Loose sensor wire.

C. Lose wires to valve.

D. Loose wires to ignition

module.

E. Air in the gas line.

F. Low voltage.

A. Gas supply is turned

"OFF".

B. Loose wire connection on

valve or ignition module.

Check voltage on AC terminals of module an/or batteries. The value should be

around 2.7 to 3.2 VAC. Conﬁrm that wire connections are secure.

Check for visible cracked casing, cuts, etc.

Check pilot assembly for visibly broken spark electrode, etc.

Check voltage on D.C. terminal of batteries. The value should be around 3.0V

Ensure that the gas supply is turned on.

Ensure sensor wire connection is secure.

Ensure black, green and orange wires connection is secure to valve.

Ensure black sensor wire (S) and black igniter wire (I) is secure to ignition

module.

Purge gas line of air.

Test voltage at AC terminals of module and/or batteries. It should be around

2.7 to 3.2 VAC.

Turned gas supply to "ON".

Check wire connection.

4. The log and glass soot.

C. Flame does not engulf

ﬂame sensor.

D. Obstructed vent system.

A. Flame impingement on

the log.

B. Improper air shutter

opening.

Check location of sensor.

Check vent system for obstructions.

Check for proper log placement.

Check for proper air shutter openings.

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 H7556 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

H7262

H7263

1 H7557 1

Gas Controls - SIT Millivolt

Item

Description Natural Gas Propane Gas

No.

15 Gas Valve, SIT H6209 1 88J53 1 16 Piezo Igniter 10K86 1 10K86 1

--- 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 - Dexen Electronic

Item

Description Natural Gas

No.

28 Gas Valve, Dexen H4681 1

29 Pilot Assembly H4673 1 30 Igniter Module H4674 1 31 Battery Holder H4675 1 32 Wire Harness H4676 1 33 Adaptor H4677 1

Part No. Qty.

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.

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

REPLACEMENT PARTS

Dexen Gas

Controls

SIT Gas

Controls

(Ref.)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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.

P/N 506017-01 Rev. E 06/2011

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

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

Specifications and Main Features

Frequently Asked Questions

User Manual