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P/N 506015-06 Rev. NC 06/2012
This manual is one of a set of two supporting this product.
Refer to P/N 506017-05 for Care and Operation Instructions.
Ce manuel est disponible en francais, simplement
en faire la demande. Numéro de la pièce 506223-39.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
INSTALLATEUR : Laissez cette notice avec l'appareil.
CONSOMMATEUR : Conservez cette notice pour
consultation ultérieure.
This appliance may be installed in an aftermarket permanently located, manufactured home (USA only) or mobile
home, where not prohibited by local codes. This appliance is only for use with the type of gas indicated on the rating
plate. This appliance is not convertible for use with other gases, unless a certified kit is used.
WARNING / AVERTISSEMENT / AVISO
• HOT GLASS WILL CAUSE
BURNS.
• DO NOT TOUCH GLASS
UNTIL COOLED.
• NEVER ALLOW CHILDREN
TO TOUCH GLASS.
WARNING: If the information in these instructions
is not followed exactly, a fire or explosion may
result, causing property damage, personal injury,
or death.
- 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.
INSTALLATION INSTRUC TIONS
MPD Pro Direct-Vent
Gas Fireplaces
MODELS
OTL Report No. 116-F-59-5
Please read and understand these instructions
• 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.
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.
- 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.
ELECTRONIC:
MPDP35IN
MPDP35IP
MPDP40IN
MPDP40IP
Portland
US
before starting installation.
• EL VIDRIO CALIENTE
CAUSARÁ QUEMADURAS.
• USTED DEBE NUNCA
TOCAR EL VIDRIO CALIENTE.
• LOS NIÑOS DEBEN NUNCA
TOCAR EL VIDRIO.

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Summary of Contents for Lennox Merit Plus Series

  • Page 1 INSTALLATION INSTRUC TIONS MPD Pro Direct-Vent Gas Fireplaces MODELS ELECTRONIC: P/N 506015-06 Rev. NC 06/2012 This manual is one of a set of two supporting this product. MPDP35IN MPDP35IP Refer to P/N 506017-05 for Care and Operation Instructions. MPDP40IN MPDP40IP Ce manuel est disponible en francais, simplement en faire la demande.
  • Page 2: Table Of Contents

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® PACKAGING GENERAL INFORMATION TABLE OF CONTENTS The assembled vented gas fireplace heater is Packaging ......2...
  • Page 3 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® These appliances comply with National WARNING WARNING Safety Standards and are tested and listed by OMNI-Test Laboratories, Inc. (Report No. Failure to position the parts in Improper installation, adjust- 116-F-59-5) to ANSI Z21.88-2009 (in Canada,...
  • Page 4: Requirements For The Commonwealth Of Massachusetts

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Gas Pressure - All Models REQUIREMENTS FOR THE COMMON- Deration - At higher elevations, the amount of BTU fuel value delivered must be reduced WEALTH OF MASSACHUSETTS...
  • Page 5: Cold Climate Insulation

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® COLD CLIMATE INSULATION For cold climate installations, seal all cracks around your appliance with noncombustible material and wherever cold air could enter the room. It is especially important to insulate...
  • Page 6: Vent Termination Clearances

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® VENT TERMINATION CLEARANCES Vertical Vent Termination Clearances The vent / air intake termination clearances These instructions should be used as a above the high side of an angled roof are as...
  • Page 7 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® EXTERIOR HORIZONTAL VENT TERMINATION CLEARANCE REQUIREMENTS NOTE: Local Codes Or Regulations May Require Different Clearances. See Item D in the Text Below. NOTE: Location Of The Vent Termination...
  • Page 8: Appliance And Vent Clearances

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® MINIMUM CLEARANCES TO COMBUSTIBLES Combustible Shelf Height - inches (millimeters) Appliance And Vent Clearances Models Top Vent with 1-foot section Rear Vent and one 90-degree elbow...
  • Page 9: Pre-Installation Steps

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® PRE-INSTALLATION STEPS TYPICAL INSTALLATION SEQUENCE DETAILED INSTALLATION STEPS The appliance is shipped with all gas controls The typical sequence of installation is outlined Step 1. FRAMING and components installed and pre-wired.
  • Page 10: Fireplace And Framing Specifications

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® FIREPLACE AND FRAMING SPECIFICATIONS Framing Framing should be VENT FRAMING: constructed of 2x4 10-1/2 TOP VENT with Model No. or larger lumber. 1 ft. of pipe and...
  • Page 11: Step 2. Routing Gas Line

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® FIREPLACE FRAMING SPECIFICATIONS Model No. Rear Vent 35-1/8 57-1/2 40-5/8 19-3/16 28-3/4 6-1/8 MPDP35 1461 1032 7" Top Vent (178 mm) 40-1/8 61-3/16 43-11/32 19-3/16...
  • Page 12: Step 3. Preparing Appliance Vent Collar

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Step 3. PREPARING APPLIANCE VENT Step 4. INSTALLING VENT SYSTEM Use only approved vent components (see Approved Vent Components on Page 2). COLLAR These instructions should be used as a...
  • Page 13: Vent Restrictor Installation

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Vent Restrictor Installation When rear venting, remove the outer wrapper knockout, cover plate, and gasket from outside The fireplace ships with the following: the unit (Figure 17).
  • Page 14 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® IF TOP VENT VERTICAL VENT LENGTH Vent Restrictor Installation in Top Vent 3. Bend the top vent flue restrictor FORWARD Systems and UP (Figure 22), and secure with the...
  • Page 15: Vertical Termination Systems (Roof)

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® VERTICAL TERMINATION SYSTEMS (ROOF) i t c See Figure 26 and Figures 34 through 38 on i t c Pages 18 and 19 and their associated Verti-...
  • Page 16: Figure 27

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Vertical (Offset) Installation All of the appliances covered in this document Push the vent component against the previous section until it fully engages, then twist the...
  • Page 17 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® F. Change vent direction to horizontal/inclined H. Frame roof opening - Identify location for J. Install the storm collar - Install the storm run - At transition from or to a horizontal/in- vent at the roof.
  • Page 18: Vertical Vent Tables And Figures

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® VERTICAL VENT FIGURES/TABLES TABLE A Ceiling Note: Secure Vent ® (rigid vent pipe) is shown Firestop/Spacer H Maximum V Minimum SV4.5VF* in the figures; Secure Flex ®...
  • Page 19 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® VERTICAL VENT FIGURES/TABLES (continued) TABLE C Maximum H Maximum V Minimum (meters) (meters) (meters) feet feet feet (1.524) (0.610) (0.305) Ceiling Firestop/Spacer (3.048) (1.219) (0.610) SV4.5VF*...
  • Page 20: Horizontal (Outside Wall) Termination System

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® HORIZONTAL (OUTSIDE WALL) TYPICAL HORIZONTAL VENT INSTALLATION TERMINATION SYSTEM Support Horizontal / Inclined Run Building Figure 39 (at right) and Figures 42 to 47 (Pag- Brackets SV4.5HT-2...
  • Page 21 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® J. Assemble vent run to exterior wall - If not previously measured, locate the center of the To help minimize water infil- Firestop/Spacer (SV4.5HF) shown tration it is recommended that vent at the exterior wall.
  • Page 22: Horizontal Vent Tables And Figures

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® HORIZONTAL VENT FIGURES/TABLES Note: Example: If 20 feet of (H) TABLE E horizontal vent run is needed, • Secure Vent ® components (rigid vent pipe and terminal) are shown in...
  • Page 23 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® HORIZONTAL VENT FIGURES/TABLES (continued) Wall Firestop/Spacer (SV4.5HF) TABLE F H Maximum V Minimum feet (meters) feet (meters) (0.914) (0.061) (2.134) (0.914) (3.35) (1.22) Wall Note - When using (4.267)
  • Page 24 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® HORIZONTAL VENT FIGURES/TABLES (continued) When using Secure Flex ® TABLE H Typical termination shown. use Firestop/Spacer SF4.5VF. H Maximum V Minimum When using Secure feet...
  • Page 25: Venting Using Flexible Vent Pipe

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® VERTICAL OR HORIZONTAL VENTING USING SECuRE FLEx ® KITS AND COMPONENTS FLEX VENT NOTE: OUTER PIPE IS PULLED AWAY TO Secure Flex ® venting kits and components may...
  • Page 26: Step 5. Field Wiring

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Step 5. FIELD WIRING Electronic Wiring (see Figures 50 and 51) WARNING All models must be connected to the main CAUTION Electronic models of these appli- power supply.
  • Page 27: Step 6. Remote Control System

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Low Battery Power Detection The life span of the Receiver batteries depends Green on various factors: quality of the batteries used, White Ground - Green...
  • Page 28: Step 7. Connecting Gas Line

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Step 8. VERIFYING APPLIANCE Optional Gas Flex Line Connector OPERATION 3/8" NPT x 3/8" 1/2" x 3/8" Flare Flare Fitting Shut-Off Valve With gas line installed, run initial system...
  • Page 29: Step 9. Installing Volcanic Stone

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Do not use more than necessary. The ember Step 9. INSTALL VOLCANIC STONE, Step 2. Install decorative volcanic stone. material should cover approximately 65% of...
  • Page 30 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® MPDP35 LOG PLACEMENT Number Description (Stamped #) Log, Rear (39-5) Log, Left (39-1) Log, Right (39-2) Log, Top Center (39-6) Log, Top/Left (39-3) Log, Top/Right (39-4) Catalog Number for the entire log set: 24M22 Position the individual logs as shown below.
  • Page 31 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® MPDP40 LOG PLACEMENT Number Description (Stamped #) Log, Center (39-8) Log, Rear (138) Log, Right (39-10) Log, Left (39-9) Log, Top/Left (39-11) Log, Top/Right (39-11) Catalog Number for the entire log set: 24M25 Position the individual logs as shown below.
  • Page 32: Step 10. Remove/Install Glass Door

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Step 10. REMOVING AND INSTALLING Step 11. BURNER ADJUSTMENTS Removing the Glass Enclosure Panel THE GLASS DOOR Remove the top radiant panel. Flame Appearance and Sooting...
  • Page 33 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Burner Flame Adjustments WARNINGS • Air shutter adjustment should only be performed by a quali- fied professional service tech- nician. • Ensure front glass panel are in place and sealed during adjustment.
  • Page 34: Step 12. Hood Installation

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Step 12. HOOD INSTALLATION Combustible Finished Wall This area must remain All models must have hoods installed prior Materials clear of combustible to operating. materials.
  • Page 35: Step 13. Attaching Safety-In-Operation

    3. Si no puede encontrar las etiquetas, sírvase safety instruction labels free of charge. 3. Si vous ne trouvez pas les étiquettes, veuillez llamar a Lennox Hearth Products o al distribuidor appeler Lennox Hearth Products ou votre distribu- de Lennox Hearth Products más cercano para teur Lennox Hearth Products local pour recevoir Cat.
  • Page 36: Installation Accessories

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® INSTALLATION ACCESSORIES Listed Secure Vent ® Components Listed Secure Vent Components Cat. No. Model Description Cat. No. Model Description 77L70 SV4.5L6 6 Inch (152 mm) H1968 SV4.5HT-2...
  • Page 37 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® INSTALLATION ACCESSORIES CONTINUED Listed Secure Flex ® Components Listed Secure Flex Components Cat. # Model Description Cat. # Model Description These termination kits include firestop/spacer, gear clamps and flex adaptor.
  • Page 38: Gas Conversion Kits

    LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® GAS CONVERSION KITS INSTALLATION INSTRUCTIONS Step 1. TURN OFF THE GAS SUPPLY TO THE WARNING APPLIANCE and disconnect power supply at the circuit breaker. Ensure appliance is cold.
  • Page 39 LENNOX HEARTH PRODUCTS • MERIT PLUS DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Step 5. On the left side of the burner, remove the two securing screws. Remove the burner assembly. Pressure Connect GTMS Regulator Wire Harness Step 6. Refer to Figure 64 and the instructions...
  • Page 40 DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS ® Lennox Hearth Products reserves the right to make changes at any time, without notice, in design, materials, specifications, and prices, and also to discontinue colors, styles, and products. Consult your local distributor for fireplace code information.

This manual is also suitable for:

Mpd pro seriesMpdp40ipMpdp35inMpdp40inMpdp35ip

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