INSTALLATION INSTRUCTIONS MPD Direct-Vent Gas Fireplaces MODELS P/N 850014 Rev. V 08/2011 ELECTRONIC: MILLIVOLT: MPDT-3328CNM-B MPDT-3328CPM-B MPDR-3328CNM-B MPDR-3328CPM-B MPD-3530CNM-B MPD-3530CPM-B This manual is one of a set of two supporting this product. Refer to P/N 875014M for Care and Operation Instructions. Ce manuel est disponible en francais, simplement en faire la demande. Numéro de la pièce 850014CF.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS 2 TABLE OF CONTENTS PACKAGING Packaging..................................................... 2 Introduction.................................................. 2 General Information...................................... 2 Requirements for the Commonwealth of Massachusetts............. 4 New York City Approval................................. 4 Cold Climate Insulation................................
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS WARNING Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier. WARNING Failure to comply with these installation instructions will result in an improperly installed and operating appliance, voiding its warranty.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS 13.0" WC (3.23 kPa) Table 2 Manifold Gas Supply Pressure (all models) Fuel # Low High Natural Gas (Lo) 1.6" WC (0.40 kPa) (Hi) 3.5" WC (0.87 kPa) Propane (Lo) 6.3" WC (1.57 kPa) (Hi) 10.0" WC (2.49 kPa) Table 3 Test gauge connections are provided on the front of the millivolt and electronic gas control valve (identified IN for the inlet and OUT for the manifold side).
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS REAR VENT APPLICATION TOP VENT APPLICATION TOP VENT TOP VENT APPLICATION APPLICATION If the fireplace is being installed on a cement slab in cold climates, a sheet of plywood or other raised platform can be placed underneath to prevent conduction of cold transferring to the fireplace and into the room.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Vent Termination Clearances These instructions should be used as a guideline and do not supersede local codes in any way. Install venting according to local codes, these instructions, the current National Fuel Gas Code (ANSI-Z223.1) in the USA or the current standards of CAN/CSA-B149.1 in Canada.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • 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 NOTE: Location Of The Vent Termination Must Not Interfere With Access To The Electrical Service. Inside Corner Detail Exterior Wall *18” Horizontal Termination G V 6” N O Q V V Ventilated Soffit A Inside Corner in U.S.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS MINIMUM CLEARANCES TO COMBUSTIBLES MINIMUM CLEARANCES* Appliance And Vent Clearances The appliance is approved with zero clearance to combustible materials on all sides (as detailed in Table 5), with the following exception: When the unit is installed with one side flush with a wall, the wall on the other side of the unit must not extend beyond the front edge of the unit.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Wall Finishes / Surrounds / Mantels Note: Combustible wall finish materials and/or surround materials must not be allowed to encroach the area defined by the appliance front face (black sheet metal). Never allow combustible materials to be positioned in front of or overlapping the appliance face (see Figures 65 and 66 on Page 34 ).
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS PRE-Installation Steps TYPICAL INSTALLATION SEQUENCE Detailed Installation Steps The appliance is shipped with all gas controls and components installed and pre-wired. The typical sequence of installation is outlined below; however, each installation is unique and may result in variations to the steps described. Step 1. Framing Before installing the appliance, follow these steps: 1.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS fireplace AND FRAMING specifications Framing Model No. MPDT-3328 MPDR-3328 MPD-3530 MPD-4035 MPD-4540 VENT FRAMING: TOP VENT WITH ONE 90° ELBOW A B C D E in. 33 1/4 33 1/4 ----- 37 3/4 12 7/8 mm 845 845 ----- 959 327 in. 33 1/4 33 1/4 19 5/8 ----- 12 7/8 mm 845 845 498 ----- 327 in. 35 1/4 35 1/4 21 11/16 39 3/4 16 mm 895 895 551 1010 406 in.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS fireplace FRAMING specifications Model No. A B C D MPDT-3328 in. 33 1/8 48 1/2 34 5/16 17 3/16 MPDR-3328 mm 841 1232 872 437 MPD-3530 MPD-4035 MPD-4540 E F 241/4 5 616 127 in. 35 1/8 57 1/2 40 5/8 19 3/16 28 3/4 6 1/8 mm 1032 892 1461 487 730 156 b MPD and MPDR units F 7" (178 mm) MPD and MPDT units in.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 3. Preparing Appliance Vent Collar (MPD-3530/4035/4540 models with combined top/rear vent) Each of the unit’s two vent collars are sealed with a cover plate and a seal plate and gasket. The cover, and seal plate and gasket must be removed from the vent collar being used.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Vertical Termination Systems (Roof) See Figure 20 and Figures 30 through 32 on Page 17 and their associated Vertical Vent Tables, which illustrate the various vertical venting configurations that are possible for use with these appliances. Secure Vent™ pipe applications are shown in these Figures; Secure Flex™ pipe may also be used.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Vertical (Offset) Installation Analyze the vent routing and determine the quantities of vent sections and number of elbows required. Refer to Vertical Vent Figures and Tables on page 14 to select the type of vertical installation desired. Vent sections are available in net lengths of 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 46-1/2" (1181 mm).
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS F. Change vent direction to horizontal/inclined run - At transition from or to a horizontal/inclined run, install the SV4.5E45 and SV4.5E90 elbows in the same manner as the straight vent sections. The elbows feature a twist section to allow them to be routed about the center axis of their initial collar section to align with the required direction of the next vent run element.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS VERTICAL Vent Figures/Tables Note: Secure Vent (rigid vent pipe) is shown in the figures; Secure Flex (flexible vent pipe) may also be used.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS VERTICAL Vent Figures/Tables (continued) TABLE C H+H1 Maximum H Maximum H1 V Minimum feet (meters) feet (meters) feet (meters) 5 (1.524) 2 (0.610) 1 (0.305) 10 (3.048) 4 (1.219) 2 (0.610) 15 (4.572) 6 (1.829) 3 (0.914) 20 (6.096) 8 (2.438) 4 (1.219) V + V1 + H + H1 = 40 feet (12.2 m) Max H = 8 feet (2.438 meters) Max. H + H1 = 20 feet (6.096 meters) Max.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Horizontal (Outside Wall) Termination System Figures 35, and Figures 39 to 44 on pages 21 to 23 and their associated Horizontal Vent Table illustrate the various horizontal venting configurations that are possible for use with these appliances. Secure Vent pipe applications are shown in these figures; Secure Flex pipe may also be used.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS J. Assemble vent run to exterior wall - If not previously measured, locate the center of the vent at the exterior wall. Prepare an opening as described in Step B. Assemble the vent system to point where the terminus of the last section is within 7 in. (178 mm) to 11-1/4 in. (286 mm) inboard of the exterior surface to which the SV4.5 HT termination is to be attached, see Figure 37.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS HORIZONTAL Vent Figures/Tables Note: Secure Vent components (rigid vent pipe and terminal) are shown in the figures; Secure Flex components (flexible vent pipe and terminal) may also be used. Note: Two 45 degree elbows may be used in place of one 90 degree elbow. The same rise to run ratios, as shown in the venting figures for 90 elbows, must be followed if 45 degree elbows are used.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS HORIZONTAL Vent Figures/Tables (continued) TABLE H H H+H1 Maximum H1 Ceiling Firestop/Spacer SV4.5VF* V Minimum H Maximum feet (meters) feet (meters) feet (meters) 5 (1.524) 2 (0.610) 1 (0.305) 10 (3.048) 4 (1.219) 2 (0.610) 15 (4.572) 6 (1.829) 3 (0.914) 20 (6.096) 8 (2.438) 4 (1.219) V + H + H1 = 40 feet (12.2 m) Max. H = 8 feet (2.438 meters) Max.
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** H + H1 + H2 Maximum feet H1 H2 *When using Secure Flex, use Ceiling Firestop/Spacer SF4.5VF. **When using Secure Flex, use Wall Firestop/Spacer SF4.5HF. H Maximum feet (meters) (meters) V Minimum feet (meters) 5 (1.524) 2 (0.610) 1 (0.305) 10 (3.048) 4 (1.219) 2 (0.610) 15 (4.572) 6 (1.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Vertical or Horizontal Venting Using Secure Flex Kits and Components Secure Flex venting kits and components may be used in any venting application where rigid Secure Vent (SV4.5) direct vent components can be used. All restrictions, clearances and allowances that pertain to the rigid piping apply to the flexible venting.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 5. Field Wiring Electronic Wiring Diagram (Honeywell) Showing the Blower Wiring for the Optional FBK-100 and FBK-200 Kits The ground supply lead must be connected to the wire attached to the green ground screw located on the outlet box (see wiring diagrams). Failure to do so will result in a potential safety hazard.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS 6. If wall-mounted ON/OFF control or thermostat is to be used, mount it in a convenient location on a wall near the fireplace.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Optional Gas Flex Line Connector 3/8" NPT x 3/8" Flare Fitting Gas Valve 1/2" x 3/8" Flare Shut-Off Valve 1/2" x 3/8" Reducer Gas Stub 3/8" Union 3/8" Close Nipple 3/8" Shut-Off Valve Figure 51: Gas Connection B. Brush all joints and connections with the gas leak test solution to check for leaks.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 9. INSTALL VOLCANIC STONE, GLOWING EMBERS AND LOGS Glowing Embers NOTE: Turn off all electricity to the appliance before you install volcanic stone, embers and logs. DO NOT attempt to install the logs until the appliance installation has been completed, the gas line connected and tested for leaks and the initial burner operation has been checked out. Step 1.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS MPD-3328 Log Placement Log Number Description (Stamped #) 1 1 2 3 4 5 6 3 2 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 4 6 5 Position the individual logs as shown below. Logs should be placed in the order shown.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS MPD-3530 Log Placement Log Number Description (Stamped #) 1 1 2 3 4 5 6 3 2 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 4 5 6 Position the individual logs as shown below. Logs should be placed in the order shown.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS MPD-4035 and MPD-4540 Log Placement Log Number Description (Stamped #) 1 1 2 3 4 5 6 2 3 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 4 5 6 Position the individual logs as shown below. Logs should be placed in the order shown.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 10. Removing and Installing the Glass Door WARNING • Do not attempt to substitute the materials used on these doors, or replace cracked or broken glass. • Handle this glass with extreme care! Glass is susceptible to damage – Do not scratch or handle roughly while reinstalling the glass door frame.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS WARNINGS • Air shutter adjustment should only be performed by a qualified professional service technician. • Ensure front glass panel are in place and sealed during adjustment. CAUTIONS • Soot will be produced if the air shutter is closed too much. Any damage due to sooting, resulting from improperly setting the air shutter, is not covered under the warranty.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 12. HOOD INSTALLATION Adjusting Set Screw Adjustment Rod Up (Fully Open Position) Burner Tube On all clean face units, slide the hood into the slots on the lower edge of the radiant panel (Figure 65). Air Shutter On louvered face units, slide the hood into the slots on the lower edge of the cabinet top (Figure 66).
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS STEP 13. ATTACHING SAFETY-IN-OPERATION WARNINGS It is the installer’s responsibility to ensure these warnings are properly affixed during installation. These warning labels are a critical step in informing consumers of safe operation of this appliance.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Installation Accessories Listed Secure Vent™ Components Cat. No. H1968 H2152 H4687 Model SV4.5HT-2 SV4.5CGV-1 SV4.5CTS Listed Secure Vent™ Components Description Cat. No. Model Horizontal Square Termination with Firestop/ Spacer (H2246) and Adaptor (74L61) Vent Sections 77L70 SV4.5L6 6 Inch (152 mm) (Rigid) 77L71 SV4.5L12 12 Inch (305 mm) 77L72 SV4.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS INSTALLATION ACCESSORIES CONTINUED Listed Secure Flex™ Components Cat. # Model Listed Secure Flex™ Components Description Cat. # Model H1969 SF4.5HT-2 Horizontal Square Termination for flex (without flex vent) 77L87 SFKIT12S Square Term. for flex (with 12 inch [305 mm] compressed flex vent**) (Ref. Instr.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Gas Conversion Kits Electronic Honeywell Systems Natural Gas To Propane Gas Conversion Kits WARNING This conversion kit shall be installed by a qualified service agency in accordance with the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS Step 2. Carefully remove the logs. Exercise care so as not to break the logs. Step 3. Refer to Figure 67. A. Above the burner, remove the two baffle securing screws. Remove the baffle. B. Remove the two screws securing the trapezoidal plate to the burner. Remove the plate. C. Remove the burner assembly with attached venturi tube. Millivolt Appliances Step 4.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS See Figure 71 and replace the pilot orifice as follows: Remove the ignitor assembly retainer clip, and carefully remove the ignitor assembly. Exercise extreme care to prevent damage to or breakage of the ignitor assembly. Remove the screw securing the pilot assembly to its mounting bracket. Back off the flare nut at the end of the pilot gas line to free the pilot assembly from the gas line.
LENNOX HEARTH PRODUCTS • MERIT® PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS NOTES 41 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT® PLUS 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, specifications, and prices, and also to discontinue colors, styles, and products. Consult your local distributor for fireplace code information. Printed in U.S.A. © 2002/2011 Lennox Hearth Products 42 P/N 850014M Rev.