Summary of the content on the page No. 1
INSTALLATION INSTRUCTIONS
MLDVT Direct-Vent
™
Gas Fireplaces
MODELS
P/N 506015-02 Rev. E 06/2011 MILLIVOLT: ELECTRONIC:
This manual is one of a set of two supporting this product.
Refer to P/N 506017-01 for Care and Operation Instructions. MLDVT-30NM MLDVT-40NM MLDVT-30NE
Ce manuel est disponible en francais, simplement
MLDVT-30PM MLDVT-40PM MLDVT-35NE
en faire la demande. Numéro de la pièce 506223-03.
MLDVT-35NM MLDVT-45NM MLDVT-40NE
MLDVT-35PM MLDVT-45PM MLDVT-45NE
INSTALLER: Leave th
Summary of the content on the page No. 2
® 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 packaged with: WARNING Introduction ......................................Page 2 • One log set located in firebox area. General Information ..........................Page 2 Young children should be care- Requi
Summary of the content on the page No. 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 cally grounded and wired in accordance with WARNING by a qualified service person. The appliance local codes or, in the absence of local codes, should be inspected before use and at least with the National Electrical Code, ANSI/NFPA Improper installation, adjust- a
Summary of the content on the page No. 4
O W OUT IN IN T H N ® 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 Supply Pressure-Tap Regulator Burner Stage (All Models) Gas (Manifold) Mounting Screw Terminal Tables 2 and 3 show the appliances' inlet and Inlet manifold gas pressure requirements: These appliances are tested and approved for installation at elevations of 0-4500 feet (0-1
Summary of the content on the page No. 5
® 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 around your appliance with noncombustible side of the unit must not extend beyond the material and wherever cold air could enter front edge of the unit. the room. It is especially important to insulate o
Summary of the content on the page No. 6
® 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 TERMINATION HEIGHTS FOR VENTS ABOVE Above Flat Or Sloped Roofs guideline and do not supersede local codes FLAT OR SLOPED ROOFS Ref. NFPA 54 / ANSI Z223.1 Horizontal Overhang in any way. Install venting according to local Roof Pitc
Summary of the content on the page No. 7
V ® 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. P N N NOTE: Location Of The Vent Termination Exterior Wall Inside Must Not Interfere With Access To The Corner Detail O Electrical Service. *18” V V G Q Horizontal Termination V 6” Ventilated Soffit A Inside
Summary of the content on the page No. 8
® 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) Model No. Appliance And Vent Clearances Top Vent - with One 90 Degree Elbow Secure Vent Secure Flex (flex elbow) The appliance is approved with zero clearance to combustible materials MLDVT-30/35 *46-1/2 (1181) *48-1/4 (1226) on all sides (as detailed in Table 5), with the following exc
Summary of the content on the page No. 9
® 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 below; however, each installation is unique and Failure to position the parts in Frame these appliances as illustrated in Figures may result in variations to the steps described. accordance with these diagrams 13 and 14 on Page
Summary of the content on the page No. 10
® 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 Framing Dimensions Vent Framing - Top Vent larger lumber. 10-1/2 Model No. A B C D With One 90° Elbow ) (267 in. 30-1/4 35-1/4 39-1/4 16 MLDVT-30 mm 768 895 997 406 in. 35-1/4 35-1/4 39-1/4 16 MLDVT-35 7 mm 895 895 997 406 (178) 5-1/8 in. 40-1/4 40-1/4 44-1/4 16 (130) 12-1/8 MLDVT-
Summary of the content on the page No. 11
® LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS FIREPLACE FRAMING SPECIFICATIONS C Model No. A B D E in. 30 1/4 12 1/4 E 53 3/16 37 29/32 26 13/16 MLDVT-30 mm 768 1350 963 681 311 7 (178) in. 35 1/4 57 1/2 40 5/8 28 3/4 13 3/4 MLDVT-35 mm 895 1461 1032 730 349 in. 40 1/4 61 13/16 43 11/32 30 11/16 15 1/8 C MLDVT-40 mm 1554 1022 1101 779 384 D in. 45 1/4 66 1/8 46 1/16 32 5/8 16 1/2 MLDVT-45 mm 1149 1680 1170 829 419
Summary of the content on the page No. 12
® LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS Installation of Vent Restrictor Step 3. INSTALL THE VENT SYSTEM Vent Restrictor Installation (Top Vent) A vent restrictor may be needed with this General Information appliance. The restrictor is installed in the A vent restrictor may be needed when vertical- appliance top flue outlet as shown in Figure These instructions should be used as a ly terminating the vent
Summary of the content on the page No. 13
® LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS VERTICAL TERMINATION SYSTEMS (ROOF) V VE EN NT T S SE EC CT TIIO ON N L LE EN NG GT TH H C CH HA AR RT T V VE EN NT T S SE EC CT TIIO ON N L LE EN NG GT TH H C CH HA AR RT T N No om miin na all T T N No om miin na all T T S Se eccttiio on n L Le en ng gtth h 6 6 1 12 2 2 24 4 3 36 6 4 48 8 O O O O O O O O O O S Se eccttiio on n L Le en ng gtth h 6 6 1 12 2 2 24 4 3 36
Summary of the content on the page No. 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 Analyze the vent routing and determine the nents are unitized concentric pipe components component clockwise running the dimples down quantities of vent section
Summary of the content on the page No. 15
® LENNOX HEARTH PRODUCTS • MERIT SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS One method of support is by utilizing field pro- K. Install the vertical termination - The final step involves installation of the SV4.5CGV-1 vided support straps (conventional plumber’s Vertical Termination. Extend the vent sections tape). Secure the plumber’s tape to the framing to the height as shown in the "Vertical vent members with nails or screws. Loop t
Summary of the content on the page No. 16
® 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 H in the Figures; Secure Flex™ (flexible vent feet (meter) feet (meter) pipe) may also be used. 5 (1.524) Elbow Only • It is very important that the horizontal/ inclined run be maintained in a straight (no 5 (1.524) 1 (0.305) u Ceiling Firestop / dips)
Summary of the content on the page No. 17
® 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 1 horizontal vent run is needed, then V Minimum 4 feet minimum of (V) vertical vent H + H Maximum 1 Ceiling u will be required. Firestop / Spacer feet (meter) feet (meter) (SV4.5VF) V 1 Wall Firestop/ v This table shows a 1(V) to 5(H) 5 (1.524) Elbow Only Spacer (SV4.5HF) ratio.
Summary of the content on the page No. 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 u Firestop / Spacer Ceiling SV4.5VF Support Bracket Spacing Vertical Every 5 ft (1.52 m) Rise u When Using Secure Flex™, Use Firestop / Spacer SF4.5VF Typical Termination See
Summary of the content on the page No. 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 Typical Firestop/Spacer (SV4.5HF) shown previously measured, locate the center of the Termination on the exterior side of the wall. It vent at the exterior wall. Prepare an opening as Shown may also be installed on the interior side. described in Step B. Assemble the vent system to point where the terminus of the last
Summary of the content on the page No. 20
® 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 Venting Components Required for Various Exterior Wall Thick- feet (meter) feet (meter) nesses, when using Typical Termination Kits 3 (0.914) Elbow Only (30/35/40 Models) Vent Components Required Exterior Wall Thickness - inches (mm) 2.
