VENT-FREE FIREPLACE SYSTEMS INSTALLATION AND OPERATING INSTRUCTIONS MODELS DFX24C DBX24C* DFX32C Natural Gas or Propane/LPG Manual or Milli-Volt *Thermostat Control Only WARNINGS If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. This is an unvented gas-fired heater. It uses air (oxygen) from the room in which it is installed. Provisions for adequate combustion and ventilation air must be provided. See page 9.
CONTENTS DFX24C and DFX32C gas log appliances described in this manual feature the TRIPLE PLAY BURNER SYSTEM® technology with exclusive triple effect technology producing a full random yellow flame, full depth ember bed and glowing logs. Important Safety Information ..................................... 3 Product Features ....................................................... 5 Product Features and Specifications ......................... 6 Getting Started ..................................................
IMPORTANT SAFETY INFORMATION INSTALLER OWNER Please leave these instructions with the appliance. Please retain these instructions for future reference. IMPORTANT WARNING Read these instructions carefully before installing or trying to operate a vent-free gas heater in this firebox. • Any change to this heater or its controls can be dangerous. • Improper installation or use of the heater can cause serious injury or death from fire, burns, explosion or carbon monoxide poisoning.
IMPORTANT SAFETY INFORMATION 15. Keep room area clear and free from combustible materials, gasoline and other flammable vapors and liquids. 16. Unvented gas heaters are a supplemental zone heater. They are not intended to be a primary heating appliance. 17. Unvented gas heaters emit moisture into the living area. In most homes of average construction, this does not pose a problem. In houses of extremely tight construction, additional mechanical ventilation is recommended. 18.
PRODUCT FEATURES Fireplace Screen Control Knob Piezo Ignition On/Off Switch Figure 1 - Unvented Gas Heater (Control Access Door Shown Open) Your vent-free fireplace must be mounted on the floor or on the optional fireplace hearth. OPERATION This unvented gas heater requires no outside venting and burns cleanly with high heating efficiency. This zero-clearance unvented gas heater can be installed against (or recessed into) any wall that is accessible to a gas line.
PRODUCT FEATURES and SPECIFICATIONS NATURAL GAS Manual and T-Stat Pressure Milli-Volt Pressure Regulator Pressure Setting 4 in. w.c. Regulator Pressure Setting 3.5 in. w.c. Gas Inlet Pressure: Max. 10.5 in. w.c. Min. 5 in. w.c. Pilot Regulator 3.5 in. w.c. Gas Inlet Pressure: Max. 10.5 in. w.c. Min. 5 in. w.c.
PRODUCT SPECIFICATIONS and GETTING STARTED Milli-Volt control has four (4) positions: OFF IGN ON LOW/HI - All gas to the gas logs is shut off at the valve. Valve position to light/maintain a standing pilot. Valve position to turn ON/OFF log set with remote switch/thermostat. Variable position to control flame height (heat output). Both front and rear burners are in operation to provide realistic glow and yellow flame.
GENERAL INSTALLATION INFORMATION In planning the installation for the fireplace it is necessary to determine where the unit is to be installed and whether optional accessories are desired. Gas supply piping should also be planned. The following steps represent the normal sequence of installation. Each installation is unique, however, and might require a different sequence. 1. Position fireplace in desired location.
GENERAL INSTALLATION INFORMATION CODES Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE ANSI Z223.1 or NFPA54 which can be obtained from… WARNING American National Standards Institute, Inc. 1430 Broadway New York, NY 10018 or National Fire Protection Association, Inc. Batterymarch Park Quincy, MA 02269 Do not install the heater • where curtains, furniture, clothing, or other flammable objects are less than 42" from the front of the heater.
GENERAL INSTALLATION INFORMATION Figure 3 - Sample Room for Determining the Maximum Heater Rating The following formula can be used to determine the maximum heater rating per the definition of unconfined space: BTU /Hr = (L1 + L2) Ft x (W) Ft x (H) Ft. BTU Hr x 1000 50 / Consider two connecting rooms with an open area between, with the following dimensions: L1 = 151/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
GENERAL INSTALLATION INFORMATION INSTALLING OPTIONAL FIREBRICK PANELS 1. Remove optional firebrick panels from packaging. Check to See that you have the following: • 3 firebrick panels • two (2) retainer brackets • two (2) black screws If any part or parts are missing, contact dealer where you bought fireplace. 2. Turn off fireplace and allow to cool. 3. Remove fireplace screen (See Figure 14, page 14) and logs. 4. Place rear firebrick panel on back wall of firebox.
GENERAL INSTALLATION INFORMATION BLACK TRIM INSTALLATION (DFX24C/DBX24C) 1. Remove black trim from protective packaging. Remove four (4) black screws and 2 (two) 90°-angle trim brackets from owner’s manual packaging. 2. Lay trim on floor and match corners of side trims to top trim (See Figure 6). 3. Use one 90°-angle trim bracket to join the corner of one piece of side trim to the corner of the top trim piece (See Figure 6). A rubber hammer or handle of a claw hammer will help secure the corners. 4.
GENERAL INSTALLATION INFORMATION BLACK TRIM INSTALLATION (DFX32C) Top Trim Piece 45°-angled Corners Back of Trim Assembly Side Trim Pieces Figure 9 - Lining Up Corners of Trim Kit Outside Corner Slot 90°-angled Bracket 90°-angled Shim Outside Corner Slot Figure 10 - Securing Corners Together Bracket Screws 1. Remove trim from protective packaging. Be careful not to scratch the trim. Remove two (2) 90°-angled mounting brackets and two (2) 90°-angled shims. 2. Lay trim face down on the floor.
GENERAL INSTALLATION INFORMATION REMOVING SCREEN 1. Remove bottom louver. See Figure 14. WARNING 2. Removing fireplace screen frame panel by pushing screen frame panel up and out. See Figure 14. Do not operate the unit without the screen frame panel and canopy installed. Canopy Fireplace Screen Louver Figure 14 - Removing Fireplace Screen Frame Panel NOTE: Fireplace screen must be removed to access log box and to install canopy. INSTALLING CANOPY 1.
GENERAL INSTALLATION INFORMATION SECURING HEATER TO FLOOR OR HEARTH Note: Clearance requirements as detailed in “CLEARANCES and HEIGHT REQUIREMENTS” section on page 17 of this manual, must be met before securing the heater in place. To prevent movement, the heater must be secured to the floor or hearth. 1. Open the control access door and remove the screen. 2. Remove carton containing the four-log set. 3. To remove the grate and base assembly, take out two (2) screws as shown in Figure 16. 4.
LOCATION OF FIREPLACE Carefully select the best location for installation of your unvented fireplace. The following factors should be taken into consideration. • Clearance to side wall, ceiling, woodwork and window or other combustibles. See Clearances and Height Requirements section on page 17. Minimum clearances to combustibles must be maintained.
CLEARANCES and HEIGHT REQUIREMENTS Ensure that minimum clearances shown in Figures 14 and 15 are maintained. Left and right clearances are determined when facing the front of the firebox. Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may create a fire hazard. 1. Sidewall Clearances — The clearance from the inside of the appliance to any combustible adjacent wall should not be less than 9" for the DBX24C/DFX24C and DFX32C. See Figure 19. 2.
FIREPLACE FRAMING If unit is to be “built in”, fireplace framing can be built before or after the appliance is set in place. BE SURE THAT ALL PACKING MATERIAL HAS BEEN REMOVED FROM THE UNDERSIDE OF THE UNIT PRIOR TO SETTING THE FIREBOX IN PLACE. Construct fireplace framing following Figures 21 through 24. See Figure 2 on page 8 for fireplace dimensions. The framing headers may rest directly on top of the firebox.
FIREPLACE FRAMING When finishing a custom cabinet, mantel, or other built-in enclosure, the opening size to accommodate the fireplace with trim installed is as follows: H DFX24C w/ trim DBX24C w/ trim DFX32C w/trim H 25 " 25" 3213/16 " J 263/4 " 263/4 " 311/4 " J WARNING Figure 25 - Custom Cabinet The fireplace must be installed giving full consideration to the clearance and height requirements identified in this manual. 1. Bend out the nailing flanges located on each side of the firebox. 2.
CONNECTING THE GAS CAUTION CAUTION NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult all local codes. Use new black iron pipe, steel pipe, copper tubing or internally tinned copper tubing. Internally tinned copper tubing can only be used per National Fuel Code, section 2.6.3, providing gas meets sulfide limits, and where permitted by local codes.
WARNING WARNING CHECKING GAS PRESSURE Connecting directly to an unregulated propane/LPG tank can cause an explosion. Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after completing connection. DO NOT USE AN OPEN FLAME. Check the gas pressure with the appliance burning and the control set to HIGH. Open control access door at bottom front of unit to find valve and regulator referred to below.
ELECTRICAL WIRING (MILLI-VOLT) The milli-volt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE. ODS Pilot On/Off Switch ODS Pilot Wall Switch Millivolt Valve On/Off Switch Spade Terminal TH = 3 TP = 1 TP/TH = 2 Red CAUTION Red Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
ELECTRICAL WIRING (MILLI-VOLT) CONNECTING REMOTE RECEIVER THESE INSTRUCTIONS SUPERSEDE THE SECTION ENTITLED “HEARTH MOUNT” IN THE MILLI-VOLT HAND-HELD REMOTE INSTRUCTIONS SUPPLIED WITH THE REMOTE. 1. Remove bottom louver door. 2. Connect the remote connectors located in the unit. 3. Stick Velcro® pads with self-adhesive backing to bottom of remote receiver and to floor of compartment behind access panel. NOTICE 4. Attach remote receiver to firebox with Velcro® pads. Control switch must face forward.
LOG PLACEMENT The positioning of the logs is critical to the safe and clean operation of this heater. Sooting and other problems may result if the logs are not properly and firmly positioned in the appliance. Never add additional logs or embellishments such as pine cones, vermiculite or rock wool to the heater. CAUTION WARNING WARNING Before you begin — This unit is supplied with a set of three ceramic fiber logs. Do not handle these logs with your bare hands.
LOG PLACEMENT Rear Log #3 PROPER INSTALLATION SEQUENCE (DFX32C) See Figure 34. 1. Install front right log (#1) on two pins on right side of burner. Left Middle Log #5 2. Install left front log (#2) on two pins on left side of burner. 3. Install back log (#3) on back of burner. Left 4. Install right middle log (#4) on two pins on burner. Rest Front right end of right middle log on the right front log. Log #2 5. Install left middle log (#5) on two pins on burner.
FLAME APPEARANCE Flames from the pilot, front and rear burner should be visually checked as soon as the heater is installed. In addition, periodically check the flames visually during operation. CHECKING THE PILOT FLAME The pilot flame must always be present when the heater is in operation. It should just touch the top of the thermocouple tip for natural. See Figure 36 and 40 for correct pilot flame. If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably.
INSTALLING ROCK WOOL AND CHECKING BURNER FLAME PLACING ROCK WOOL DFX24C AND DFX32C MODELS WARNING After installing logs, pull apart dime-size pieces of rock wool. Sprinkle rock wool evenly over burner ports. Wash hands after installing rock wool. Itching may occur. • • • • Use only rock wool provided with log set. Do not add additional rock wool. Place rock wool on burner ports only. Keep air gap between rear log and burner CLEAN.
CHECKING THE BURNER FLAME OPERATING INSTRUCTIONS Avoid any drafts that alter burner flame patterns. Do not allow fans to blow directly into the fireplace. Do not place a blower inside the burn area of the firebox. Ceiling fans may create drafts that alter flame patterns. Sooting and improper burning will result. During manufacturing, fabricating and shipping, various components of this appliance are treated with certain oils, films or bonding agents.
OPERATING INSTRUCTIONS WARNING FOR YOUR SAFETY READ BEFORE LIGHTING If you do not follow these instruction exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance is equipped with a piezo ignition device which automatically lights the pilot. If piezo is not working properly see Match Lighting Instructions, page 33. B. BEFORE OPERATING smell all around the appliance area for gas.
OPERATING INSTRUCTIONS MANUAL CONTROL LIGHTING INSTRUCTIONS 1. 2. 3. 4. STOP! Read the safety information. Make sure the manual shutoff valve is fully open. This heater is equipped with an ignition device (piezo) which automatically lights the pilot. See Figure 43, page 29 for the location of the piezo ignitor and control knob. Push in gas control knob slightly to the OFF position. and turn control knob clockwise NOTE: Knob cannot be turned to OFF unless knob is pushed in slightly. Do not force. 5.
OPERATING INSTRUCTIONS THERMOSTATIC CONTROL LIGHTING INSTRUCTIONS STOP! Read the safety information . Make sure the manual shutoff valve is fully open. This heater is equipped with an ignition device (piezo) which automatically lights the pilot. See Figure 44, page 29 for the location of the piezo ignitor and control knob. Turn control knob clockwise to the OFF position. 5. Wait 5 minutes to clear out any gas. Then smell for gas, including near the floor.
OPERATING INSTRUCTIONS 1. 2. 3. 4. 5. MILLI-VOLT CONTROL LIGHTING INSTRUCTIONS STOP! Read the safety information label. Make sure the manual shutoff valve is fully open. This gas log set is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo ignitor does not light the pilot, See instructions for Match Lighting Instructions, page 32. Turn gas control knob clockwise to the OFF position, set the thermostat to the lowest setting and turn ON/OFF switch to OFF position.
OPERATING INSTRUCTIONS 1. 2. 3. 4. MATCH LIGHTING INSTRUCTIONS Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). Follow appropriate lighting instructions found previously. Instead of pushing and releasing the piezo button, light a match and hold the flame to the end of the pilot and ignite the pilot. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot access.
BLOWER AND OTHER OPTIONAL EQUIPMENT OPTIONAL EQUIPMENT FORCED AIR KIT If you are installing the forced air kit (Models BLO24-T, BLO24-TB or BLOT), see the installation instructions provided with the kit for electrical wiring requirements or the blower installation section. Model DFX24C uses blower model BLO24T. Model DFX32C uses blower model BLOT. Model DBX24C uses blower model BLO24TB. The firebox must be connected to main power supply at time of firebox installation.
ILLUSTRATED PARTS BREAKDOWN FOR CABINET ACCESSORIES 1 3 4 5 2 6 STANDARD FEATURES ITEM DESCRIPTION QTY DFX24C DBX24C DFX32C 1 Canopy 1 33D4000 33D4000 33D5000 2 Screen Assembly 1 33D4501 33D4501 33D5501 3 Left Firebrick (Optional) 1 26D7061 26D7061 26D7065 4 Center Firebrick (Optional) 1 26D7060 26D7060 26D7064 5 Right Firebrick (Optional) 1 26D7062 26D7062 26D7066 6 Blower (Optional) 1 BLO24T BLO24TB BLOT 33D4047 35
ILLUSTRATED PARTS BREAKDOWN DFX24C MILLI-VOLT WARNING DFX24C MANUAL Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury.
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
ILLUSTRATED PARTS BREAKDOWN DFX32C MILLI-VOLT WARNING DFX32C MANUAL 16 Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury.
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
ILLUSTRATED PARTS BREAKDOWN WARNING DBX24C T-STAT Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury.
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
WARNING TROUBLESHOOTING Turn appliance OFF and allow to cool before servicing. Only a qualified service person should service and repair the heater. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY When ignitor button is pressed, there is no spark at ODS/pilot. 1. Ignitor electrode positioned wrong. 1 Replace ignitor. 2. Ignitor electrode is broken. 2. Replace ignitor. 3. Ignitor electrode not connected to ignitor cable. 3.
WARNING TROUBLESHOOTING If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backfire when lit. If the gas quality or pressure is low, contact your local gas supplier immediately. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY ODS/pilot lights, but flame 1. Control knob not fully pressed in. goes out when control knob 2. Control knob not pressed in long is released. enough. 1. Press in control knob fully. 2.
MONESSEN HEARTH SYSTEMS LIMITED LIFETIME WARRANTY POLICY LIFETIME WARRANTY The following components are warranted for life to the original owner, subject to proof of purchase: Firebox, Combustion Chamber, Heat Exchanger, Grate and Stainless Steel Burners. FIVE YEAR WARRANTY The following components are warranted for 5 years to the original owner, subject of proof of purchase: Ceramic Fiber Logs, Catalytic Filter and Aluminized Burners.