® DIRECT-VENT FIREPLACE OWNER’S OPERATION AND INSTALLATION MANUAL This fireplace meets the construction and safety standards of H.U.D. for application in mobile homes when installed according to these instructions. This appliance is shipped ready for natural gas installation. The propane/LP conversion parts are included. MBDV37 AND MBDV41 FOR YOUR SAFETY — Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
® DIRECT-VENT FIREPLACE SAFETY INFORMATION WARNINGS IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate, or service this fireplace. Improper use of this fireplace can cause serious injury or death from burns, fire, explosions, electrical shock, and carbon monoxide poisoning. DANGER: Carbon monoxide poisoning may lead to death! This fireplace is a vented product. This fireplace will not produce any gas leakage into your home if properly installed.
OWNER’S MANUAL LOCAL CODES Install and use fireplace with care. Follow all local codes. In the absence to local codes, use the current National Fuel Gas Code, ANS Z223.1, also known as NFPA 54* (USA) or the current CAN/CGA-B149[.1 or .2] Installation Codes (Canada). *Available from: American National Standards Institute, Inc. 1430 Broadway New York, NY 10018 National Fire Protection Association, Inc.
® DIRECT-VENT FIREPLACE PRE-INSTALLATION PREPARATION LOCATION AND SPACE REQUIREMENTS Determine the safest and most efficient location for your Vanguard direct-vent fireplace. Make sure that rafters and wall studs are not in the way of the venting system. Choose a location where the heat output is not affected by drafts, air conditioning ducts, windows or doors. Figure 2 shows some common locations. Read all venting information in this manual.
OWNER’S MANUAL PRE-INSTALLATION PREPARATION GENERAL VENTING Note: Terminations are not designed for installation prior to transportation. Continued 13" 9 1/4" These models are approved for use with Simpson Dura-Vent 6 5/8" direct-vent pipe components and terminations as well as both flex and rigid Vanguard vent components.
® DIRECT-VENT FIREPLACE GENERAL VENTING Continued N N D H V L E B C Fixed Closed F B Openable Fixed Closed V Openable V I V G B V B B J X V G G M A V K X V A V TERMINATION CAP A = clearance above grade, veranda, porch, deck, or balcony [*12 inches (305mm) minimum] B = clearance to window or door that may be opened [12 inches (305mm) minimum] C = clearance to permanently closed window [minimum 12 inches (305mm) recommended to prevent condensation on window] D = vertical clearance t
OWNER’S MANUAL VENTING INSTALLATION WARNING: Read all instructions completely and thoroughly before attempting installation. Failure to do so could result in serious injury, property damage or loss of life. Operation of improperly installed and maintained venting system could result in serious injury, property damage or loss of life. WARNING: Seal all vent connections. Seal only the outer pipe connections with high temperature silicone (600°F/316° C).
® DIRECT-VENT FIREPLACE VENTING INSTALLATION Continued Installing Vent System in a Chase A chase is a vertical boxlike structure built to enclose venting that runs along the outside of a building. A chase is not required for such venting. NOTICE: Treatment of firestops and construction of the chase may vary from building type to building type. These instructions are not substitutes for the requirements of local building codes. You must follow all local building codes . 2.
OWNER’S MANUAL VENTING INSTALLATION 4. Continued 3. Attach vent pipe assembly to the fireplace. Set fireplace in front of it’s permanent location to insure minimum clearances. Mark the wall for a 10" square hole (for noncombustible material such as masonry block or concrete, a 7 1/2" diameter hole is acceptable). See Figure 12. The center of the hole should line up with the center-line of the horizontal rigid vent pipe.
® DIRECT-VENT FIREPLACE VENTING INSTALLATION Continued Horizontal Venting UP Horizontal Termination Configurations Figures 16 through 20 show different configurations for venting with horizontal termination. Each figure includes a chart with vertical minimum/maximum and horizontal maximum dimensions which must be met. Seal all connections with high temperature silicone sealant (outer pipe only) as specified in the second warning statement on page 7.
OWNER’S MANUAL VENTING INSTALLATION Continued Venting with Two 90° Elbows Vertical (V) Horizontal (H1) Horizontal (H1) + Horizontal (H2) 5' min. 6' min. 7' min. 8' min. 2' max. 4' max. 6' max. 8' min. 6' max. 12' max. 18' max. 20' max. 20' max. 8' max. 20' max. UP Figure 19 - Horizontal Termination Configuration for Rigid Venting Using Two 90° Elbows Venting with Two 90° Elbows Vertical (V) Horizontal (H1) + Horizontal (H2) 5' min. 6' min. 7' min. 8' min. 6' max. 12' max. 18' max. 20' max.
® DIRECT-VENT FIREPLACE VENTING INSTALLATION Flat Ceiling Installation 1. Continued INSTALLATION FOR VERTICAL TERMINATION 1. 2. Determine the route your vertical venting will take. If ceiling joists, roof rafters, or other framing will obstruct the venting system, consider an offset (see Figure 21) to avoid cutting loadbearing members.
OWNER’S MANUAL VENTING INSTALLATION Continued 3. 4. 5. Vertical Termination Configurations Figures 25 through 28 show four different configurations for vertical termination. All connections must be sealed with high temperature silicone sealant as specified in the second warning on page 7. Lower the support box through the hole in the roof until the bottom of the box extends at least 2" below the ceiling (see Figure 23). Align the support box vertically and horizontally using a level.
® DIRECT-VENT FIREPLACE VENTING INSTALLATION Continued Note: Install restrictor into 4" collar of stove as shown. Note: Install restrictor into 4" collar of stove as shown. RVF Kit Shown Vertical Venting Venting with Two 90° Elbows V = 40' max. Vertical (V1) Horizontal (H) 5' min. 6' min. 7' min. 8' min. 6' max. 12' max. 18' max. 20' max. Figure 28 - Vertical Rigid Venting Configuration With No Horizontal Run Note: Vertical (V1) + Vertical (V2) = 20' max.
OWNER’S MANUAL VENTING INSTALLATION Continued HIGH ALTITUDE INSTALLATION Your Vanguard direct-vent fireplace has been AGA tested and approved for elevations from 0-2000 feet and CGA certified for elevations from 0-4500 feet. When installing this fireplace at an elevation above 2000 feet (in the USA), you may need to decrease the input rating by changing the existing burner orifice to a smaller size. Reduce input 4% for each 1000 feet above sea level.
® DIRECT-VENT FIREPLACE Number Description Available from DESA International: SD2040 SD2050 Simpson Dura-Vent GS 30° Elbow (6 pcs.) Simpson Dura-Vent GS 60° Elbow (6 pcs.
OWNER’S MANUAL FIREPLACE INSTALLATION Continued BLOWER ASSEMBLY AND OPERATION Note: The blower is preinstalled in this fireplace. Verify blower assembly placement was not altered during shipping and speed control is mounted to bracket. NOTICE: If installing blower in an existing fireplace with gas connections, shut off gas supply and disconnect heater from gas supply. Contact a qualified service person to do this.
® DIRECT-VENT FIREPLACE Note: This unit does not have a HI/LOW feature FIREPLACE INSTALLATION Continued Gas Valve To Thermopile WALL SWITCH INSTALLATION WARNING: Do not wire remote wall switch to main power supply (Standard 120v household current).
OWNER’S MANUAL FIREPLACE INSTALLATION Continued INSTALLING GAS PIPING TO FIREPLACE LOCATION WARNING: A qualified service person must connect fireplace to gas supply. Follow all local codes. CAUTION: For propane/LP units, never connect heater directly to the propane/LP supply. This heater requires an external regulator (not supplied). Install the external regulator between the heater and propane/LP supply. IMPORTANT: Install main gas valve (equipment shutoff valve) in an accessible location.
® DIRECT-VENT FIREPLACE GAS SUPPLY TESTING FIREPLACE INSTALLATION CHECKING GAS CONNECTIONS Note: This section is intended as a guide for qualified service technicians installing gas to the appliance. WARNING: Never use an open flame to check for a leak. Apply commercial leak test solution to all gas joints. Bubbles forming show a leak. Correct all leaks at once. The gas control valve is secured underneath the firebox with two brackets fastened to the firebox bottom.
OWNER’S MANUAL FIREPLACE INSTALLATION Continued Open ON POSITION Equipment Shutoff Valve Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa) 1. 2. 3. Close equipment shutoff valve (see Figure 43). Pressurize supply piping system by either opening propane/LP supply tank valve for propane/LP gas fireplace or opening main gas valve located on or near gas meter for natural gas fireplace, or using compressed air.
® DIRECT-VENT FIREPLACE FIREPLACE INSTALLATION Continued REMOVING/REPLACING GLASS DOOR You must remove glass door to install optional brick liners, logs, lava rock, and ember material. Screw Glass Door Assembly CAUTION: Do not operate this fireplace with a broken glass door panel. Do not operate this fireplace without the glass door panel securely in place. For replacement part information see Replacement Parts, page 35. 1. 2. 3. 4.
OWNER’S MANUAL FIREPLACE INSTALLATION Continued INSTALLING OPTIONAL BRICK LINER D8037A/D8041 Left Side Brick Panel WARNING: If fireplace has been running, turn off and unplug fireplace. Let cool before installing brick liner. This brick liner kit is optional. You may purchase brick liner from your local dealer or see Accessories, page 38. CAUTION: Always handle brick panels with two hands. Do not force brick panels into place. Excessive force will break brick panels. Remove glass door.
® DIRECT-VENT FIREPLACE FIREPLACE INSTALLATION 7. Continued INSTALLING LOGS, LAVA ROCK AND GLOWING EMBERS WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this heater may result in property damage or personal injury. Each log is marked with a number. These numbers will help you identify the log when installing. It is very important to install these logs exactly as instructed. Do not modify logs.
OWNER’S MANUAL OPERATING GUIDELINES AND MAINTENANCE INSTRUCTIONS When lit for the first time, the appliance may emit a slight odor for about 16 - 24 hours. This is normal and is due to the “curing” of the logs and the “burn-in” of internal paints and lubricants used in the manufacturing process. Keep compartments, logs, burners, and area surrounding the logs clean by vacuuming or brushing at least twice a year. Temporary removal of the log set may ease the cleaning of the burner and pilot assembly.
® DIRECT-VENT FIREPLACE LIGHTING INSTRUCTIONS OPERATING FIREPLACE 1. 5. 6. 7. 8. 9. Push in gas control knob all the way and hold. Immediately light the pilot by repeatedly depressing the piezo spark ignitor until a flame appears. Continue to hold for about one (1) minute after the pilot is lit. Release gas control knob and it will pop back. Pilot should remain lit. If it goes out, repeat steps 5 through 8.
OWNER’S MANUAL OPERATING BLOWER OPERATING FIREPLACE Blower Control Knob If your pilot assembly does not meet these requirements: • turn fireplace off (see To Turn Off Gas to Appliance, page 26) • see Troubleshooting, pages 31 through 34 OFF ON PILOT ASSEMBLY The pilot assembly is factory preset for the proper flame height. Alterations may have occurred during shipping and handling. Call a qualified service person to readjust the pilot if necessary.
® DIRECT-VENT FIREPLACE INSPECTING BURNERS Continued Figure 59 shows a typical flame pattern for MBDV37 and MBDV41. If burner flame pattern differs from that described: • turn fireplace off (see To Turn Off Gas to Appliance, page 26) • see Troubleshooting, pages 31 through 34 Figure 59 - Typical Flame Pattern for MBDV37 and MBDV41 CLEANING AND MAINTENANCE WARNING: Turn off fireplace and let cool before cleaning.
OWNER’S MANUAL INSTALLATION INSTRUCTIONS FOR CONVERSION NATURAL TO PROPANE/LP WARNING: This conversion kit must be installed by a qualified service agency in accordance with the manufacturer instructions and all applicable codes and requirements of the authority having jurisdiction. If the information in these instructions is not followed exactly, a fire, explosion, or production of carbon monoxide may result causing property damage, personal injury, or loss of life.
® DIRECT-VENT FIREPLACE 8. 9. Remove the burner by loosening the two 5/16" hex mounting screws (see Figure 62). Lift burner up and out. Convert the pilot burner by changing out the pilot orifice. Remove the compression nut and compression sleeve from the pilot. Remove the pilot orifice from inside the pilot barrel (see Figure 63). Replace with the pilot orifice supplied with the fireplace. Note: The new pilot orifice has the number 30 stamped on it for identification purposes.
OWNER’S MANUAL TROUBLESHOOTING WARNING: Turn off heater and let cool before servicing. Only a qualified service person should service and repair heater. Note: For additional help, visit DESA International’s technical service web site at www.desatech.com. CAUTION: Never use a wire, needle, or similar object to clean pilot. This can damage pilot unit. Note: All troubleshooting items are listed in order of operation.
® DIRECT-VENT FIREPLACE TROUBLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE REMEDY Pilot will not light 1. No gas supply, or shutoff valve is OFF 2. Air in gas line 1. Check to see if you have gas supply 2. Hold control valve in the PILOT position for 2 to 3 minutes to purge air. If you smell gas stop and wait for a few minutes before trying to light the fireplace 3. Remove debris and dirt, inspect and clean any other possible obstructions 4. Contact your gas supplier 5.
OWNER’S MANUAL TROUBLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE REMEDY Delayed ignition burner 1. Manifold pressure is too low 1. Contact local propane/LP or natural gas company 2. Clean burner (see Cleaning and Maintenance, page 28) or replace burner orifice 2. Burner porting or orifice clogged Burner backfiring during combustion 1. Burner orifice is clogged or damaged 2. Damaged burner 3. Gas regulator defective 1.
® DIRECT-VENT FIREPLACE TROUBLESHOOTING Continued WARNING: If you smell gas Shut off gas supply. 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. • • • • IMPORTANT: Operating fireplace where impurities in air exist may create odors.
OWNER’S MANUAL REPLACEMENT PARTS WIRING DIAGRAM Note: Use only original replacement parts. This will protect your warranty coverage for parts replaced under warranty. PARTS UNDER WARRANTY Contact authorized dealers of this product. If they can not supply original replacement part(s), call DESA International’s Technical Service Department at 1-800-DESA LOG (1-800-337-2564).
® DIRECT-VENT FIREPLACE ILLUSTRATED PARTS BREAKDOWN 41 33 36 MBDV37 MBDV41 7 2 11 (Included in Hardware Pack) 49 34-3 34-5 34-1 25 6 52 34-2 48 34-4 47 29 26 1 27 44 37 18 6 6 20 35 19 24 30 43 16 40 4 28 31 22 39 21 23 17 28 9 5 5 12 8 5 50 10 35 38 13 14 15 42 45 51 7 32 46 35 3 36 106497
OWNER’S MANUAL PARTS LIST This list contains replaceable parts used in your fireplace. When ordering parts, follow the instructions listed under Replacement Parts on page 31 of this manual. DIRECT-VENT FIREPLACE MBDV37 MBDV41 KEY NO.
® DIRECT-VENT FIREPLACE ACCESSORIES Purchase these fireplace accessories from your local dealer. If they can not supply these accessories, call DESA International’s Sales Department at 1-800-432-2382. for information. You can also write to the address listed on the back page of this manual. BRASS PERIMETER TRIM KIT - D9037(37")/GA6091(41") (Not Shown) Optional three sided brass trim kit covers unfinished edges around fireplace. Provides a finished appearance with the class of brass.
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WARRANTY INFORMATION KEEP THIS WARRANTY Model Serial No. Date Purchased Always specify model and serial numbers when communicating with the factory. We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our standard written warranty. We make no other warranty, expressed or implied.
