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P/N 506015-07 Rev. A 08/2012
This manual is one of a set of two supporting this product.
Refer to P/N 506017-06 for Care and Operation Instructions.
Ce manuel est disponible en francais, simplement
en faire la demande. Numéro de la pièce 506223-43.
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 certifi ed kit is used.
WARNING / AVERTISSEMENT / AVISO
WARNING: If the information in these instructions
is not followed exactly, a fire or explosion may
result, causing property damage, personal injury,
or death.
vapors and liquids in the vicinity of this or any other
appliance.
ry to light any appliance.
phone in your building.
neighbor'
instructions.
department.
- Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
INSTALLATION INSTRUC TIONS
MPD Direct-Vent
Gas Fireplaces
MODELS
MPDT33RNM
MPDT33RPM
MPDR33RNM
MPDR33RPM
MPD35CNM
MPD35RNM
OTL No. 116-F-13g-5
Please read and understand these instructions
AVERTISSEMENT : Assurez-vous de bien suivre les
instructions données dans cette notice pour réduire au
minimum le risque d'incindie ou d'explosion ou pour
éviter tout dommage matériel, toute blessure ou la mort.
- 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.
téléphones se trouvant dans le bâtiment où vous trouvez.
's
un voisin. Suivez les instructions du fournisseur.
appelez le service des incindies.
- 'installation et l'entretien doivent être assurés par un
installateur ou un service d'entretien qualifié ou par le
fournisseur de gaz.
MILLIVOLT:
MPD35RPM
MPDT33RNE
MPD40CNM
MPDR33RNE
MPD40RNM
MPD35CNE
MPD40RPM
MPD35RNE
MPD45RNM
MPD45RPM
Portland
US
before starting installation.
r. Ne pas vous servir des
ELECTRONIC:
MPD40CNE
MPD40RNE
MPD45RNE

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  • Page 1 INSTALLATION INSTRUC TIONS MPD Direct-Vent Gas Fireplaces MODELS P/N 506015-07 Rev. A 08/2012 MILLIVOLT: ELECTRONIC: MPDT33RNM MPD35RPM MPDT33RNE MPD40CNE This manual is one of a set of two supporting this product. Refer to P/N 506017-06 for Care and Operation Instructions. MPDT33RPM MPD40CNM MPDR33RNE...
  • Page 2: Table Of Contents

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS PACKAGING GENERAL INFORMATION TABLE OF CONTENTS The assembled vented gas fi replace heater is Packaging ............ 2 WARNING packaged with: Introduction ..........2 • (1 set) Logs (packaged in a carton inside General Information ........
  • Page 3 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS These appliances comply with National WARNING WARNING Safety Standards and are tested and listed by OMNI-Test Laboratories, Inc. (Report I m p r o p e r...
  • Page 4: Requirements For The Commonwealth Of Massachusetts

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Gas Pressure—All Models Install the appliance according to the Model Nat.Gas Propane regulations of the local authorities having Series drill size (inches) drill size (inches)
  • Page 5: Cold Climate Insulation

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • 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 outside chase cavity between studs and under fl...
  • Page 6: Vent Termination Clearances

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • 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 (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS NOTE: Local Codes Or Regulations May Require Different Clearances. See Item D in the Text Below. NOTE: Location Of The Vent Termination Inside Exterior Wall...
  • Page 8: Appliance And Vent Clearances

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS MINIMUM CLEARANCES TO COMBUSTIBLES 1/2 in. (13 mm) Back 0 in. (0 mm) from Spacers Or Appliance And Vent Clearances Dimples The appliance is approved with zero clearance to combustible 1/2 in.
  • Page 9 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Wall Finishes / Surrounds / Mantels Note: Combustible wall fi nish materials and/or surround materials must not be allowed to encroach the area defi ned by the appliance front face (black sheet metal).
  • Page 10: Pre-Installation Steps

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS DETAILED INSTALLATION STEPS PRE-INSTALLATION STEPS TYPICAL INSTALLATION SEQUENCE Step 1. FRAMING The appliance is shipped with all gas controls The typical sequence of installation is outlined below;...
  • Page 11: Fireplace And Framing Specifi Cations

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Framing VENT FRAMING: Framing should be TOP VENT WITH ONE constructed of 2x4 10-1/2 90° ELBOW or larger lumber. . n i 33 1/4 —...
  • Page 12: Step 2. Routing Gas Line

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS FIREPLACE FRAMING SPECIFICATIONS . n i 24 1/4 MPDT33 MPD and MPDR units MPDR33 . n i 7" MPD35 MPD and MPDT units (178 mm) .
  • Page 13: Step 3. Preparing Appliance Vent Collar

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 3. PREPARING APPLIANCE VENT Use only approved vent components (see Select Venting System—Horizontal or Vertical Approved Vent Components on Page 2). COLLAR ( MPD35/-40/-45 models with combined top/rear vent) These fi...
  • Page 14: Vertical Termination Systems

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS VERTICAL TERMINATION SYSTEMS (ROOF) i t c i t c See Figure 19 and Figures 27 through i t c i t c 29 on Page 17 and their associated Vertical Vent Tables, which illustrate the various vertical venting confi...
  • Page 15 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Vertical (Offset) Installation The dimpled end of the vent components E. Support the vertical vent run sections— fi t over the appliance collar to create the...
  • Page 16 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS F. Change vent direction to horizontal/ K. Install the vertical termination—The inclined run—At transition from or to a fi nal step involves installation of the horizontal/inclined run, install the SV4.5E45...
  • Page 17: Vertical Vent Tables And Figures

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS VERTICAL VENT FIGURES/TABLES TABLE A Ceiling Note: Secure Vent ® (rigid vent pipe) is Firestop/Spacer H Maximum V Minimum shown in the fi gures; Secure Flex ®...
  • Page 18 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • 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 19: Horizontal Termination System

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS HORIZONTAL (OUTSIDE WALL) Support Horizontal / Inclined Run Building Brackets SV4.5HT-2 TERMINATION SYSTEM Support Termination Framing Figure 32, and Figures 35 to 41 on SV4.5E90...
  • Page 20 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS J. Assemble vent run to exterior wall—If To help minimize water not previously measured, locate the center infiltration it is recommended that of the vent at the exterior wall. Prepare an the Firestop/Spacer (SV4.5HF)
  • Page 21: Horizontal Vent Tables And Figures

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS HORIZONTAL VENT FIGURES/TABLES Note: Install the U-shaped vent TABLE F restrictor in any vent run with Note: Secure Vent ® components (rigid vent pipe and terminal) are...
  • Page 22 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS HORIZONTAL VENT FIGURES/TABLES (continued) TABLE H V Minimum Maximum H Maximum feet (meters) (meters) (meters) feet feet (1.524) (0.610) (0.305) (3.048) (1.219) (0.610) Ceiling (4.572) (1.829)
  • Page 23 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS HORIZONTAL VENT FIGURES/TABLES (continued) TABLE K Wall Firestop/Spacer SV4.5HF** Maximum H Maximum V Minimum feet (meters) feet (meters) feet (meters) (1.524) (0.610) (0.305) (3.048) (1.219) (0.610)
  • Page 24: Venting Using Flexible Vent Pipe

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS VERTICAL OR HORIZONTAL VENTING USING FLEX VENT NOTE: OUTER PIPE IS PULLED AWAY TO SECURE FLEX ® KITS AND COMPONENTS SHOW THE DETAIL OF THE INNER PIPE SECURING SCREW ®...
  • Page 25: Step 5. Field Wiring

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 5. FIELD WIRING Refer to Section A for millivolt appliances THERMOPILE and Section B for electronic appliances. The APPLIANCE- MOUNTED ON/OFF SWITCH gas valve is set in place and pre-wired at the...
  • Page 26: Step 6. Optional Blower Kit Wiring

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Note: Remote receiver should be located These appliances are equipped with a gas fl ex 120V, 60HZ, 1PH in the wall, or if installed in the control...
  • Page 27: Step 8. Verifying Appliance Operation

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS The pilot fl ame should be steady, not lifting Optional Gas Flex Line Connector or fl oating. Flame should be blue in color 3/8" NPT x 3/8"...
  • Page 28: Step 9. Installing Logs

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 9. INSTALL VOLCANIC STONE, Glowing Embers GLOWING EMBERS, AND LOGS WARNING • DO NOT attempt to install the logs until the appliance installa- tion has been completed, the gas...
  • Page 29 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS MPD33 LOG PLACEMENT Number Description (Stamped #) Log, Rear (39-12) Log, Left (39-1) Log, Right (39-2) Log, Top Center (39-13) Log, Top/Left (39-3) Log, Top/Right (39-4) Catalog Number for the entire log set: 24M15 Position the individual logs as shown below.
  • Page 30 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS MPD35 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: H6197 Position the individual logs as shown below.
  • Page 31 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS MPD40 AND MPD45 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 (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 10. REMOVING AND INSTALLING Removing the Glass Enclosure Panel Step 11. BURNER ADJUSTMENTS (see Figure 56) THE GLASS DOOR Flame Appearance and Sooting Remove the top louver assembly or radiant Proper fl...
  • Page 33 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS WARNING • Air shutter adjustment should only be performed by a qualifi ed professional service technician. • 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 (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 12. HOOD INSTALLATION Combustible Adjusting Set Screw Finished Wall Refer to Figures 61 and 62. All models This area must remain Materials Adjustment Rod Up...
  • Page 35: Step 13. Attaching Safety-In-Operation Warnings

    3. If you are unable to locate the labels, please llamar a Lennox Hearth Products o al distribuidor proprié taire. En cas de doute, collez l’étiquette call Lennox Hearth Products or your nearest de Lennox Hearth Products más cercano para...
  • Page 36: Installation Accessories

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • 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 (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS INSTALLATION ACCESSORIES CONTINUED Listed Secure Flex ® Components Listed Secure Flex ® Components Cat. # Model Description Cat. # Model Description These termination kits include fi restop/spacer, gear clamps and fl ex adaptor.
  • Page 38: Gas Conversion Kits

    LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS GAS CONVERSION KITS Electronic SIT Systems Natural Gas To Propane Gas WARNING Conversion Kits Models Catalog No. This conversion kit shall be installed by a qualifi ed service agency in...
  • Page 39 LENNOX HEARTH PRODUCTS • MERIT PLUS ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 9. Refer to Figure 64. Remove the Step 16. Relight the main burner. The lighting Step 4. Carefully remove the logs. Exercise pilot hood assembly to access the hexed instructions can be found on the lighting care so as not to break the logs.
  • Page 40 ® DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Lennox Hearth Products reserves the right to make changes at any time, without notice, in design, materials, specifi cations, prices and also to discontinue colors, styles and products. Consult your local distributor for fi replace code information.

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