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LENNOX HEARTH PRODUCTS  •  MERIT PLUS

®

 B-VENT GAS FIREPLACES (MPB33/35/40/45)  •  CARE AND OPERATION INSTRUCTIONS

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Important Safety Information

1. WARNING: Do not operate appliance with the glass front 

removed, cracked or broken. 

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 

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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.

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  

3.  et toute commande qui a été plongée dans l’eau.
4.  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.

5.  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.

6.  On ne devrait pas placer de vêtements ni d’autres matières 

inflammables sur l’appareil ni à proximité.

7.  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.

8.  Tout écran ou protecteur retiré pour permettre l’entretien de l’appareil 

doit être remis en place avant de mettre l’appareil en marche.

9.  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 

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[SPANISH]

Información importante de seguridad

1.  ADVERTENCIA: No opere el artefacto con el frente de vidrio quitado, 

agrietado o roto.

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  

3.  de control y cualquier control de gas que haya estado bajo agua.
4.  Debido a las altas temperaturas, el artefacto debe situarse fuera  
5.  de las áreas de tráfico y lejos del mobiliario y cortinas.
6.  Se debe alertar a los niños y adultos sobre los peligros de  
7.  las altas temperaturas en la superficie y que se mantengan  
8.  alejados para evitar quemaduras o ignición de la ropa. 
9.  No debe colocarse ropa u otros materiales inflamables  
10. sobre y cerca del artefacto.

11. 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  

12. para mantener a los niños pequeños, jóvenes y otras personas  
13. en riesgo fuera del cuarto y lejos de las superficies calientes.
14. Cualquier malla o resguardo de seguridad quitado para dar servicio a 

un artefacto, debe reinstalarse antes de operar el artefacto.

15. 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 

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Summary of Contents for MPB-35

Page 1: ...ng 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 VID...

Page 2: ...s Controls Control Compartment Access 8 Variable Flame Height Adjustment 9 Vent Operation Test and Resetting The Safety Limit Switch 9 Maintenance 11 Front Glass Enclosure Panel Removal and Installation 12 Install Volcanic Stone Glowing Embers and Logs 13 Burner Flame Appearance Sooting 17 Burner Flame Adjustments 18 Millivolt Appliance Checkout 18 Electronic Appliance Checkout 18 Wiring Diagrams ...

Page 3: ...oir Page 5 Lisez la section Informations importantes relatives à la sécurité Page 4 Toutes les parties de votre foyer Lennox Hearth Products deviennent EXTRÊMEMENT CHAUDES 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 in...

Page 4: ...s 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 8 ...

Page 5: ...uptor opera la chimenea encendiéndola y apagándola Limpie bien la placa del interruptor 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 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 ...

Page 6: ...r assistance or additional information consult a qualified installer service agency or the gas supplier AVERTISSEMENT Une installation un réglage une modification une réparation ou un entretien mal effectué peut causer des dommages matériels ou des blessures Voir la notice de l utilisateur qui accompgne l appareil Pour de l aide ou des renseignements supplémentaires consultez un installateur un te...

Page 7: ...d gas pressure requirements Inlet Gas Supply Pressure Fuel Minimum Maximum Natural Gas 4 5 WC 1 12 kPa 10 5 WC 2 62 kPa Propane 11 0 WC 2 74 kPa 13 0 WC 3 24 kPa Table 2 The appliance and its appliance main gas valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1 2 psi 3 5 kPa The appliance must be isolated from th...

Page 8: ...ter HI LO flame adjustment knob pilot and main gas ON OFF control knob and gas valve Figure 1 are located behind the lower access panel On electronic systems the hi lo flame adjustment knob and gas valve are located behind the lower access panel To remove the lower access panel slide the hinge pin on the left side of the panel to the RIGHT until it disengages from the left corner post hole Pull th...

Page 9: ...mit switch perform the following steps NOTE Allow the appliance to cool com pletely 1 Remove the top louver panel 2 Reset the safety limit switch by pushing the red reset button located between the wire terminals on the back of the switch See Figure 4 Detail A 3 The appliance should then relight and re main lit NOTE If the appliance does not relight turn off the appliance and call for a qualified ...

Page 10: ...n Page 12 5 Remove the three 3 screws securing the lintel and then remove the lintel One of the lintel cabinet top holes is shown in Figure 4 Detail B 6 Remove the three 3 screws securing the scoop and then remove the scoop see Figure 4 Detail B 7 Remove the two 2 screws securing the safety switch bracket and remove the switch bracket assembly with low voltage wires attached through the side panel...

Page 11: ...ing ATTENTION Au moment de l entretien des commandes étiquetez tous les fils avant de les débrancher Des erreurs de cáblage peuvent entraîner un fonc tionnement inadéquat et dangereux Inspect and clean all wire connections Ensure that there is no melting or damage Inspection should include Terminals at the valve ON OFF Switch optional unit mounted switch or standard CPI switch electronic models on...

Page 12: ...igned to operate only when the front glass enclosure panels are installed Generally the front glass enclosurepanelshouldnotberemovedexceptto gainaccesstothecomponentswithinthefirebox REMOVING GLASS ENCLOSURE PANELS Remove the top louver assembly To access the glass door securing latch first open the lower control compartment door Figure 5 by pushing in simultaneously the left and right top corners...

Page 13: ...volcanic stone should be placed directly on top of the firebox bottom along the front and to the back at the right and left sides of the burner Position any optional ceramic fiber liners before placing the volcanic stone Logs should be positioned after the volcanic stone NOTE This appliance is provided with enough glowing embers for several applications do not feel compelled to use all that is in ...

Page 14: ... with the log s notches directly over the brackets Position the right log log no 3 by inserting the pin from the rear log into the hole on its upper end Place the left log and then the smaller left and right top logs All logs that have notches to fit over the grate tines should be positioned with these notches directly against the grate All top logs that rest on lower logs do so over flattened mou...

Page 15: ...e placed in the order shown Position the rear log on the brackets at the rear of the firebox with the log s notches directly over the brackets Position the right log log no 3 by inserting the pin from the rear log into the hole on its upper end Place the left log and then the smaller left and right top logs All logs that have notches to fit over the grate tines should be positioned with these notc...

Page 16: ... Position the individual logs as shown below Logs should be placed in the order shown Position the center log on the burner first then place the glowing embers as shown in Figure 7 Place the rear log both the right and left and then the smaller left and right top logs All logs that have notches to fit over the grate tines should be positioned with these notches directly against the grate All top l...

Page 17: ...r opening must be adjusted between these two extremes Air Shutter Adjustment Guidelines If there is smoke or soot present first check the log set positioning to ensure that the flames are not impinging on any of the logs If the log set is properly positioned and a sooting condition still exists then the air shutter opening should be increased Themoreoffsetsintheventsystem thelarger the air shutter...

Page 18: ...mentally to a more closed position until the proper flame appearance is achieved 4 When satisfied that the burner flame appearance is normal turn the ON OFF control unit mounted or remote switch depending on your application to the OFF position 5 Reinstall the lower control access panel then proceed to finish the installation Millivolt Appliance Checkout To light the burner rotate the gas valve co...

Page 19: ...WITCH WALL SWITCH OR REMOTE CONTROL RECEIVER A B H C T I W S T I M I L WT BK BK BK Schematic Representation Only Figure 19 Wiring Diagram Electronic Gas Valves P N 580491 01 JUNCTION BOX 120V AC REMOTE RECEIVER ON OFF SWITCH WALL SWITCH LIMIT SWITCH B VENT MODELS ONLY AC DC POWER ADAPTOR HOT NEUTRAL OPTIONAL GROUND BATTERY HOLDER DFC WIRE HARNESS SPARK WIRE CABLE PILOT GROUND WIRE PILOT SENSOR CAB...

Page 20: ...Low Battery Detection Remote Control The life of the remote control batteries depends on many factors including battery quality and number of appliance ignitions When the transmitter batteries are low the LED light will be dim to alert of a low battery condition before losing all power As soon as the depleted batteries are replaced the Transmitter will restart its normal operation Low Battery Dete...

Page 21: ...e Remote Simple On Off Cat No Model No Description H8840 KIT RC G FIRE Remote Control Cost Effective Solution Simple On Off operation Workswithmillivoltandlowvoltageelectronic ignition controls Kit includes Remote and Receiver Remote Two Button Timer On Off Or Timer Mode Cat No ModelNo Description H8860 RC S 1 Remote Control Wall Control 4 button timer with 30 60 120 OFF minutes Wall surface mount...

Page 22: ...thout duct FOAK 4LD for use if outside combustion air is required or desired If model FOAK 4LDisuseditmustbeusedinconjunction with locally purchased non combustible Class 1 or Class 0 flexible duct Outside Combustion Air Kits Cat No ModelNo Description 81L87 FOAK 4 Combustion Air Kit with duct 81L88 FOAK 4LD Combustion Air Kit without duct Style View Doors Style View doors come in three styles The...

Page 23: ...t the vent system at the top and at the base within the firebox for signs of blockage or obstruction Look for any signs of dislocation of the vent components reconnect or replace as necessary Appliance Checkout Qualified Service Technician Perform the appropriate appliance checkout procedure detailed in this manual Replace Glowing Embers Homeowner Qualified Services Technician Remove old ember mat...

Page 24: ... repeat steps 5 through 9 If knob does not pop up when released stop and immediately call your service technician or gas supplier LIGHTING INSTRUCTIONS TO TURN OFF GAS TO APPLIANCE If the pilot will not stay lit after several tries turn the gas control knob to OFF and call your service technician or gas supplier 10 Turn gas control knob counterclockwise to ON 11 Close control compartment 12 If app...

Page 25: ...t La veilleuse devrait rester allumée Si elle s éteint répétez les étapes 5 à 8 inclusivement Si la manette ne se soulève pas d elle même lorsqu on la relâche arrêter et appeler immédiatement un technicien qualifié ou le fournisseur de gaz Si la veilleuse ne reste pas allumée après plusieurs tentatives réglez la manette d admission du gaz à la position OFF et appelez un technicien qualifié ou le f...

Page 26: ...ult 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 Electronic Gas Control Valve SIT Electronic Pilot Assembly 3 Turn off all electric power to the appliance if service is to be performed NOTE The c...

Page 27: ... peut avoir une batterie de secours installer les batteries au besoin 8 Placez l interrupteur du récepteur en position REMOTE ou l interrupteur mural en position ON 9 Si applicable Appuyez sur le bouton ON OFF pour sélectionner ON 10 Si applicable Ajustez le thermostat sur la télécommande à l ajustement désiré 11 Si l appareil ne se met pas en marche suivez les instructions intitulées Comment coup...

Page 28: ...e the limit switch Disconnect the wires from the ON OFF switch and the valve label wires for reattachment Test for continuity with a multimeter If continuity is not indicated switch is de fective and must be replaced Wall switch or wires defective Check wall switch and wires for proper connections Jumper wire across terminals at wall switch if burner comes on replace defective wall switch If okay ...

Page 29: ...a service technician if required Pilot flame is not engulfing the sensor Call a service technician Obstructed vent system Call a service technician Soot is present on the glass and panels Initial fireplace operation A white film may develop on the glass during the first few fires as part of the burn in process The first few times you use the fireplace clean the glass after each use AFTER THE GLASS...

Page 30: ...rner Natural Gas 99K74 1 60J80 1 99K76 1 24M10 1 11 Orifice Main Burner LP Gas 99K78 1 19L52 1 21L01 1 37G00 1 12 Bag Of Embers Rockwool 88L53 1 88L53 1 88L53 1 88L53 1 13 Bag Of Decorative Volcanic Stone 80L42 1 80L42 1 80L42 1 80L42 1 14 Gas Line Flexible Connector 93L32 1 93L32 1 93L32 1 93L32 1 15 Safety Limit Switch High Limit Disc 62L16 1 62L16 1 62L16 1 62L16 1 WARNING Failure to position t...

Page 31: ...LE LENNOX HEARTH PRODUCTS MERIT PLUS B VENT GAS FIREPLACES MPB33 35 40 45 CARE AND OPERATION INSTRUCTIONS Replacement Parts 7 4 11 5 14 9 40 45 9 33 35 17 16 10 40 45 33 35 10 12 13 19 18 20 22 21 23 25 24 31 1 2 3 8 40 45 33 35 8 15 29 30 28 27 6 ...

Page 32: ...ices and also to discontinue colors styles and products Consult your local distributor for fireplace code information LENNOX the LENNOX design DAVE LENNOX the image of DAVE LENNOX and other related LENNOX marks are registered or common law trademarks of Lennox Industries Inc and are used with permission Printed in U S A 2012 Lennox Hearth Products LLC P N 506017 04 Rev D 04 2013 1508 Elm Hill Pike...

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