Lennox MLDVT-30NM Installation Instructions Manual

Merit series mldvt direct-vent gas fireplaces

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P/N 506015-02 Rev. G 02/2012
This manual is one of a set of two supporting this product.
Refer to P/N 506017-01 for Care and Operation Instructions.
Ce manuel est disponible en francais, simplement
en faire la demande. Numéro de la pièce 506223-03.
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
MLDVT Direct-Vent
Gas Fireplaces
MODELS
MLDVT-30NM
MLDVT-35NM
MLDVT-35NM-FB
MLDVT-40NM
MLDVT-40NM-FB
MLDVT-45NM
Report No. 100326540PRT-001
• 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.
MILLIVOLT:
MLDVT-30PM
MLDVT-35PM
MLDVT-35PM-FB
MLDVT-40PM
MLDVT-45PM
• EL VIDRIO CALIENTE
CAUSARÁ QUEMADURAS.
• USTED DEBE NUNCA
TOCAR EL VIDRIO CALIENTE.
• LOS NIÑOS DEBEN NUNCA
TOCAR EL VIDRIO.
ELECTRONIC:
MLDVT-30NE
MLDVT-35NE
MLDVT-40NE
MLDVT-45NE

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Summary of Contents for Lennox MLDVT-30NM

  • Page 1 MLDVT Direct-Vent ™ Gas Fireplaces MODELS MILLIVOLT: ELECTRONIC: P/N 506015-02 Rev. G 02/2012 MLDVT-30NM MLDVT-30PM This manual is one of a set of two supporting this product. MLDVT-30NE Refer to P/N 506017-01 for Care and Operation Instructions. MLDVT-35NM MLDVT-35PM MLDVT-35NE...
  • Page 2: Table Of Contents

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® PACKAGING GENERAL INFORMATION TABLE OF CONTENTS Packaging .........Page 2 The assembled vented gas fireplace heater is WARNING packaged with: Introduction ........Page 2 • One log set located in firebox area.
  • Page 3 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® The appliance, when installed, must be electri- Note: Installation and repair should be done WARNING cally grounded and wired in accordance with by a qualified service person. The appliance...
  • Page 4: Requirements For The Commonwealth Of Massachusetts

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Gas Pressure - All Models Orifice Sizes - Sea Level to High Altitude (All Models) Supply Pressure-Tap Regulator Burner Stage Tables 2 and 3 show the appliances' inlet and...
  • Page 5: Cold Climate Insulation

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® COLD CLIMATE INSULATION Note: When the unit is installed with one For cold climate installations, seal all cracks side flush with a wall, the wall on the other...
  • Page 6: Vent Termination Clearances

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® VENT TERMINATION CLEARANCES Vertical Vent Termination Clearances Termination Heights For Vents These instructions should be used as a Above Flat Or Sloped Roofs TERMINATION HEIGHTS FOR VENTS ABOVE...
  • Page 7 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • 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 SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® MINIMUM CLEARANCES TO COMBUSTIBLES Combustible Shelf Height - Inches (millimeters) Appliance And Vent Clearances Model No. Top Vent - with One 90 Degree Elbow...
  • Page 9: Pre-Installation Steps

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® DETAILED INSTALLATION STEPS TYPICAL INSTALLATION SEQUENCE WARNING Step 1. FRAMING The typical sequence of installation is outlined Failure to position the parts in below; however, each installation is unique and...
  • Page 10: Fireplace/Framing Specifications

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® FIREPLACE AND FRAMING SPECIFICATIONS Framing Framing should be constructed of 2x4 or Vent Framing - Top Vent Framing Dimensions larger lumber. 10-1/2 With One 90° Elbow Model No.
  • Page 11: Step 2. Routing Gas Line

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® FIREPLACE FRAMING SPECIFICATIONS 30 1/4 12 1/4 53 3/16 37 29/32 26 13/16 MLDVT-30 1350 7 (178) 35 1/4 57 1/2 28 3/4 13 3/4...
  • Page 12: Step 3. Install The Venting System

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Step 3. INSTALL THE VENT SYSTEM Installation of Vent Restrictor Vent Restrictor Installation (Top Vent) A vent restrictor may be needed with this General Information appliance.
  • Page 13: Vertical Termination Systems

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® VERTICAL TERMINATION SYSTEMS (ROOF) O O O O O O O O O O i t c i t c See Figure 17 on Page 13 and Figures 25 through...
  • Page 14 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Vertical (Offset) Installation B. Attach vent components to appliance - Push the vent component against the previous Secure Vent SV4.5 direct-vent system compo- section until it fully engages, then twist the...
  • Page 15 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® K. Install the vertical termination - The final One method of support is by utilizing field pro- vided support straps (conventional plumber’s step involves installation of the SV4.5CGV-1 Vertical Termination.
  • Page 16: Vertical Vent Tables And Figures

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® VERTICAL VENT FIGURES/TABLES Table A Notes: H Maximum V Minimum • Secure Vent™ (rigid vent pipe) is shown in the Figures; Secure Flex™ (flexible vent...
  • Page 17: Horizontal Termination System

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® VERTICAL VENT FIGURES/TABLES (continued) Example: If 20 feet total (H+H Table B horizontal vent run is needed, then V Minimum Maximum 4 feet minimum of (V) vertical vent Ceiling will be required.
  • Page 18 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Building Support TYPICAL HORIZONTAL VENT INSTALLATION Support Brackets Horizontal / Inclined Run Framing Typical Termination SV4.5E90 Shown Elbow SV4.5L6/12/24/36/48 Exterior Vent Sections Wall Firestop / Spacer Ceiling SV4.5VF...
  • Page 19 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® J. Assemble vent run to exterior wall - If not Firestop/Spacer (SV4.5HF) shown Typical previously measured, locate the center of the Termination on the exterior side of the wall. It vent at the exterior wall.
  • Page 20: Horizontal Vent Tables And Figures

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Use Table 8 as an aid in venting component selection for a particular range of exterior wall thicknesses. Table C H Maximum V Minimum...
  • Page 21 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® HORIZONTAL VENT FIGURES / TABLES (continued) Wall Firestop/Spacer Table E (SV4.5HF) V Minimum Maximum feet (meter) feet (meter) (0.914) Elbow Only (1.524) (0.305) (3.048) (0.610)
  • Page 22 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® HORIZONTAL VENT FIGURES / TABLES (continued) Table F Typical termination shown. V Minimum Maximum  When using Secure Flex use Firestop/Spacer feet (meter) feet (meter) SF4.5VF.
  • Page 23: Venting Using Flexible Vent Pipe

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® VERTICAL OR HORIZONTAL VENTING USING Flex Vent SECURE FLEx™ KITS AND COMPONENTS NOTE: Outer pipe is pulled away to show the detail of the inner pipe.
  • Page 24: Step 4. Field Wiring

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Step 4. FIELD WIRING Refer to Section A for millivolt appliances and B. Electronic Wiring (see Figure 38) Section B for electronic appliances. The gas...
  • Page 25: Step 5. Optional Blower Kit Wiring

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® BLOWER CONTROL CIRCUIT WIRING Note: Remote receiver should be located in the Step 5. WIRING: OPTIONAL FORCED 120V, 60HZ, 1PH wall, or if installed in the control compartment,...
  • Page 26: Step 6. Connecting Gas Line

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Step 6. CONNECTING GAS LINE GAS CONNECTION Gas Flex Line Connector All codes require a shut-off valve mounted 3/8" NPT x in the supply line. The orientation of the 1/2"...
  • Page 27: Step 7. Verifying Appliance Operation

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® TEST ALL CONNECTIONS FOR GAS LEAKS Step 7. VERIFYING APPLIANCE The flame should project 1" (25 mm) beyond (FACTORY AND FIELD) the hood at all three ports (see Figure 43).
  • Page 28: Step 8. Installing Logs

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Step 8. INSTALL VOLCANIC STONE, REFERENCE Glowing Embers GLOWING EMBERS, AND LOGS Firebox Accessories / Parts Separate into Quarter Cat. No. Model No. Description...
  • Page 29 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® MLDVT-30 & MLDVT-35 LOG PLACEMENT (model-35 shown; model-30 similar) Number Description Rear Log Left Front Log Right Front Log Left Cross Log Right Cross Log...
  • Page 30 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® MLDVT-40 & MLDVT-45 LOG PLACEMENT (model-40 shown; model-45 similar) Number Description Rear Log Left Front Log Right Front Log Left Cross Log Right Cross Log...
  • Page 31: Step 9. Installing Glass Door

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Step 9. INSTALLATION AND REMOVAL 3. Pull the bottom of the door out a few inches Step 10. BURNER ADJUSTMENTS and grasp it on the right and left. Gently lift...
  • Page 32 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Burner Air Shutter Adjustment Procedure Adjustment Set-Screw Main Burner Factory Air Shutter WARNINGS Opening Setting - Inches (millimeter) Adjustment Rod Up (closed min. position) Model Nat.Gas...
  • Page 33: Step 11. Hood Installation

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Step 11. HOOD INSTALLATION (Refer to Figure 53) All models must have a hood installed prior to This area must operating. remain clear of combustible 3"...
  • Page 34: Step 12. Attaching Safety-In-Operation Warnings

    3. If you are unable to locate the labels, please call (Figure C). Choisissez la langue qui est principale- Lennox Hearth Products o al distribuidor de Lennox Lennox Hearth Products or your nearest Lennox ment parlée dans la résidence du propriétaire.
  • Page 35: Installation Accessories

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® INSTALLATION ACCESSORIES Listed Secure Vent™ Components Cat. No. Model Description Cat. No. Model Description 77L70 SV4.5L6 6 Inch (152 mm) Vent Sections (Rigid) 77L71 SV4.5L12...
  • Page 36 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® INSTALLATION ACCESSORIES CONTINUED Cat. # Model Description Listed Secure Vent™ Components H1969 SF4.5HT-2 Horizontal Square Termina- tion for flex (without flex) Cat. # Model...
  • Page 37: Gas Conversion Kits

    LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® GAS CONVERSION KITS Electronic DEXEN Systems Natural Gas To Propane Gas WARNING Conversion Kits Models Catalog No. This conversion kit shall be installed by a qualified service agency in...
  • Page 38 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Step 6. See Figure 57 and remove the pilot hood assembly to access the hexed pilot orifice. Pressure-Tap Burner Stage Burner Assembly (Manifold) Terminal...
  • Page 39 LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS ® Step 8. See Figure 59 and replace the pilot Step 10. Reassemble the remaining compo- Burner Orifice Sizes orifice as follows: Remove pilot hood assembly...
  • Page 40 SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION 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.

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