VENT-FREE FIREPLACE SYSTEMS INSTALLATION AND OPERATING INSTRUCTIONS MODELS DFX24 DBX24* DFX32 Natural Gas or Propane/LPG Manual, Milli-Volt, or Thermostat Control *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.
CONTENTS IMPORTANT SAFETY INFORMATION ................................................................................................................ 3 PRODUCT FEATURES ........................................................................................................................................ 5 PRODUCT FEATURES and SPECIFICATIONS .................................................................................................. 6 GETTING STARTED ..................................................
IMPORTANT SAFETY INFORMATION INSTALLER Please leave these instructions with the owner. OWNER Please retain these instructions for future reference. IMPORTANT Read these instructions carefully before installing or trying to operate this vent-free gas heater. WARNING • 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 17. During manufacturing, fabricating and shipping, various components of this appliance are treated with certain oils, films or bonding agents. These chemicals are not harmful but may produce annoying smoke and smells as they are burned off during the initial operation of the appliance, possibly causing headaches or eye or lung irritation. This is a normal and temporary occurrence.
PRODUCT FEATURES Fireplace Screen Lighting Instruction and Warning Plates Piezo Ignition Control Knob Control Access Door 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.
PRODUCT FEATURES and SPECIFICATIONS NATURAL GAS Manual Pressure/T-Stat Regulator Pressure Setting: Gas Inlet Pressure: Milli-Volt Pressure 3 in. w.c. Max. 10.5 in. w.c. Min. 5 in. w.c. Regulator Pressure Setting: Pilot Regulator: Gas Inlet Pressure: 3.5 in. w.c. 3.5 in. w.c. Max. 10.5 in. w. c. Min. 5 in. w.c.
PRODUCT SPECIFICATIONS and GETTING STARTED Thermostat control has three (3) positions: OFF - All gas to the gas logs is shut off at the valve. IGN - Valve position to light/maintain a standing pilot. LOW/HI - Variable position corresponding to desired temperature. Milli-Volt control has four (4) positions: OFF - All gas to the gas logs is shut off at the valve. IGN - Valve position to light/maintain a standing pilot. ON - Valve position to turn ON/OFF log set with remote switch/thermostat.
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 x 1000 50 Consider two connecting rooms with an open area between, with the following dimensions: L1 = 15 1/2 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 BRASS TRIM INSTALLATION (DFX24/DBX24) 1. Remove brass trim from protective packaging. Remove four (4) brass 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 BRASS TRIM INSTALLATION (DFX32) 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 WARNING Removing fireplace screen frame panel by pushing screen frame panel up and out. Refer Figure 14. Do not operate the unit without the screen frame panel and canopy installed. Canopy Fireplace Screen Figure 14 - Removing Fireplace Screen Frame Panel NOTE: Fireplace screen must be removed to access log box and to install canopy. INSTALLING CANOPY 1. Remove the fireplace screen as described in the previous section. 2.
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. Refer to “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. 12" Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may create a fire hazard. 2 1/2" 1.
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 22 through 25. Refer to 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 DFX24 w/ trim DBX24 w/ trim DFX32 w/trim H 243/4 243/4 3213/16 J 263/4 263/4 311/4 J WARNING Figure 26 - 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 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. Gas piping system must be sized to provide minimum inlet pressure (listed on Data Plate) at the maximum flow rate (BTU/Hr).
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. CAUTION 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 SUPERCEDE THE SECTION ENTITLED “HEARTH MOUNT” IN THE MILLI-VOLT HAND-HELD REMOTE INSTRUCTIONS SUPPLIED WITH THE REMOTE. 1. Cut cable to length (approximately 12") for placement in the fireplace. 2. Strip back 1/4" of the insulation from both ends of each wire. 3. Connect two connectors to the wires at one end of the cable. 4. Insert the opposite ends of the wires into the receiver wire terminals and tighten the screws. 5.
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 PROPER INSTALLATION SEQUENCE (DBX24) Install one-piece log on two locating pins. One-piece Log Locating Pin Locating Pin Figure 35 - Proper Sequence of Log Installation (DBX24) PROPER INSTALLATION SEQUENCE (DFX32) 1. Position the rear log (#2) in logbracket and on locating pins. 2. Install the front log (#1) in bracket. Visually center log.
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. Refer to Figure 37 and 39 for correct pilot flame. If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably.
CHECKING THE BURNER FLAME In normal operation at full rate after 15 minutes, the following flame appearances should be observed: DFX24 MODEL The rear flames above and behind log #2, and in front of log #3, may be yellow. The flames should extend approximately 2" - 4" above log #2. Refer to Figure 41. Log #3 Log #2 Front Log Figure 41 - Correct Appearance of Rear Flames (DFX24 Model) DBX24 MODEL The flames inside the one-piece log may be yellow.
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 an ignition device which automatically lights the pilot. Do not try to light the pilot by hand. B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.
OPERATING INSTRUCTIONS MANUAL CONTROL LIGHTING INSTRUCTIONS 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 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. Refer to Figure 44, page 29 for the location of the piezo ignitor and control knob. Push in gas control knob slightly and turn control knob clockwise to the OFF position.
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. Refer to Figure 45, page 30 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, refer to instructions for “MATCH LIGHTING INSTRUCTIONS”, page 33. 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, Model BLO24 or Model BLO, see the installation instructions provided with the kit for electrical wiring requirements or the blower installation section. Models DFX24 and DBX24 use blower model BLO24. Model DFX32 uses blower model BLO. The firebox must be connected to main power supply at time of firebox installation. The blower must be installed prior to the installation of the unvented heater.
ILLUSTRATED PARTS BREAKDOWN FOR CABINET ACCESSORIES 1 3 4 5 2 6 STANDARD FEATURES ITEM 1 2 3 4 5 6 33D0237 DESCRIPTION Canopy Screen Assembly Left Firebrick (Optional) Center Firebrick (Optional) Right Firebrick (Optional) Blower (Optional) QTY DFX/DBX24 DFX32 1 1 1 1 1 1 33D0015 33D0050 33D0202 33D0200 33D0201 BLO-24 33D1022 33D1066 33D1044 33D1042 33D1043 BLO 35
ILLUSTRATED PARTS BREAKDOWN DFX24 MILLI-VOLT DFX24 MANUAL WARNING DFX24 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.
ILLUSTRATED PARTS BREAKDOWN DFX32 MILLI-VOLT DFX32 MANUAL WARNING DFX32 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.
ILLUSTRATED PARTS BREAKDOWN WARNING DBX24 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. 2. 3. 4. Ignitor electrode positioned wrong. Ignitor electrode is broken. Ignitor electrode not connected to ignitor cable. Ignitor cable pinched or wet. Keep ignitor cable dry. 5.
TROUBLESHOOTING POSSIBLE CAUSE REMEDY 4. Thermocouple connection loose at control valve. 5. Pilot flame not touching thermocouple, which allows thermocouple to cool, causing pilot flame to go out. This problem could be caused by either low gas pressure, or a dirty or partially clogged ODS/pilot. 6. Thermocouple damaged. 7. Control valve damaged. 4. Hand tighten until snug, then tighten 1/4 turn more. 5. Contact local gas company. One or both burners do not light after ODS/pilot is lit. 1.
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.
