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Monessen Hearth Vent-Free Fireplace Systems DBX24C* Installation And Operating Instructions Manual

Monessen hearth vent-free fireplace systems installation and operating instructions
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VENT-FREE FIREPLACE SYSTEMS

INSTALLATION AND OPERATING INSTRUCTIONS

MODELS
DBX24C*
Natural Gas or
Propane/LPG
Manual or Milli-Volt
*Thermostat Control Only
This is an unvented gas-fi red 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.
DFX24C
DFX32C
READ AND SAVE THESE INSTRUCTIONS
WARNINGS
If the information in this manual is not followed
exactly, a fi re or explosion may result causing
property damage, personal injury or loss of
life.
Do not store or use gasoline or other fl ammable
vapors and liquids in the vicinity of this or any other
appliance.
WHAT TO DO IF YOU SMELL GAS
• 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 fi re
department.
Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.

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  Summary of Contents for Monessen Hearth Vent-Free Fireplace Systems DBX24C*

  • Page 1: Installation And Operating Instructions

    VENT-FREE FIREPLACE SYSTEMS INSTALLATION AND OPERATING INSTRUCTIONS MODELS DFX24C DBX24C* DFX32C Natural Gas or Propane/LPG Manual or Milli-Volt *Thermostat Control Only This is an unvented gas-fi red heater. It uses air (oxygen) from the room in which it is installed. Provisions for adequate combustion and ventilation air must be provided.
  • Page 2: Table Of Contents

    CONTENTS DFX24C and DFX32C gas log appliances described in this manual feature the producing a full random yellow fl ame, full depth ember bed and glowing logs. Important Safety Information ... 3 Product Features ... 5 Product Features and Specifi cations ... 6 Getting Started ...
  • Page 3: Important Safety Information

    INSTALLER Please leave these instructions with the appliance Read these instructions carefully before installing or trying to operate a vent-free gas heater in this fi rebox. • 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 fi...
  • Page 4 IMPORTANT SAFETY INFORMATION 15. Keep room area clear and free from combustible materi- als, 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 appli- ance.
  • Page 5: Product Features

    Fireplace Screen Control 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. 33D4047 Knob Piezo...
  • Page 6: Product Features And Specifi Cations

    PRODUCT FEATURES and SPECIFICATIONS NATURAL GAS Regulator Pressure Setting 4 in. w.c. Gas Inlet Pressure: Max. 10.5 in. w.c. Min. 5 in. w.c. Model Number DFX24NMC DFX24NVC DFX32NMC DFX32NVC DBX24NTC PROPANE / LPG Note: An external regulator is required to reduce supply pressure to a maximum of 13" w. c. Regulator Pressure Setting Gas Inlet Pressure: Model Number...
  • Page 7: Getting Started

    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. LOW/HI - Variable position to control flame height (heat output).
  • Page 8: General Installation Information

    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.
  • Page 9 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… Do not install the heater • where curtains, furniture, clothing, or other •...
  • Page 10 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: Consider two connecting rooms with an open area between, with the following dimensions: If there were a door between the two rooms the calculation would be based only on the room with the heater.
  • Page 11 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 If any part or parts are missing, contact dealer where you bought fireplace. 2.
  • Page 12 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 fl oor and match corners of side trims to top trim (See Figure 6). 3.
  • Page 13 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 No Spaces where Corners Join Figure 11 - Making Sure Corners Are Flush...
  • Page 14 GENERAL INSTALLATION INFORMATION REMOVING SCREEN 1. Remove bottom louver. See Figure 14. 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.
  • Page 15 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.
  • Page 16: Location Of Fireplace

    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. •...
  • Page 17: 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.
  • Page 18: Fireplace Framing

    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.
  • Page 19 When finishing a custom cabinet, mantel, or other built-in enclosure, the opening size to accommodate the fireplace with trim installed is as follows: DFX24C w/ trim DBX24C w/ trim 25 " " 1. Bend out the nailing flanges located on each side of the firebox. 2.
  • Page 20: Connecting The Gas

    CONNECTING THE GAS NOTICE: A qualifi ed 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 sulfi...
  • Page 21: Checking Gas Pressure

    Connecting directly to an unregulated propane/LPG tank can cause an explosion. MANUAL CONTROL (Figure 28) The pressure regulator is preset and locked to dis- courage tampering. If the pressure is not as specified, replace the regulator with the correct part from the parts list in this manual.
  • Page 22: Electrical Wiring (Milli-Volt)

    ELECTRICAL WIRING (MILLI-VOLT) The milli-volt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE. Wall Switch On/Off Switch TH = 3 TP = 1 TP/TH = 2 CAUTION Label all wires prior to disconnection when servicing controls.
  • Page 23 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 ®...
  • Page 24: Log Placement

    LOG PLACEMENT Before you begin — This unit is supplied with a set of three ceramic fiber logs. Do not handle these logs with your bare hands. Always wear gloves to prevent skin irritation from ceramic fibers. After handling logs, wash your hands gently with soap and water to remove any traces of fibers.
  • Page 25 PROPER INSTALLATION SEQUENCE (DFX32C) See Figure 34. 1. Install front right log (#1) on two pins on right side of burner. 2. Install left front log (#2) on two pins on left side of burner. 3. Install back log (#3) on back of burner. 4.
  • Page 26: Flame Appearance

    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 fl ame must always be present when the heater is in operation. It should just touch the top of the ther- mocouple tip for natural.
  • Page 27: Installing Rock Wool And Checking Burner Flame

    INSTALLING ROCK WOOL AND CHECKING BURNER FLAME PLACING ROCK WOOL DFX24C AND DFX32C MODELS 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. •...
  • Page 28: Checking The Burner Flame

    CHECKING THE BURNER FLAME OPERATING INSTRUCTIONS Avoid any drafts that alter burner fl ame 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.
  • Page 29: Operating Instructions

    FOR YOUR SAFETY READ BEFORE LIGHTING 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. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.
  • Page 30: Manual Control Lighting Instructions

    OPERATING INSTRUCTIONS MANUAL 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 43, page 29 for the location of the piezo ignitor and control knob. Push in gas control knob slightly and turn control knob clockwise NOTE: Knob cannot be turned to OFF unless knob is pushed in slightly.
  • Page 31: Thermostat Control Lighting 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.
  • Page 32: Milli-Volt Control Lighting Instructions

    OPERATING INSTRUCTIONS MILLI-VOLT CONTROL LIGHTING INSTRUCTIONS 1. STOP! Read the safety information label. 2. Make sure the manual shutoff valve is fully open. 3. 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.
  • Page 33: Match Lighting Instructions

    1. Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). 2. 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. 3.
  • Page 34: Blower And Other Optional Equipment

    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.
  • Page 35: Illustrated Parts Cabinet Accessories

    ILLUSTRATED PARTS BREAKDOWN FOR CABINET ACCESSORIES STANDARD FEATURES ITEM DESCRIPTION Canopy Screen Assembly Left Firebrick (Optional) Center Firebrick (Optional) Right Firebrick (Optional) Blower (Optional) 33D4047 DFX24C DBX24C 33D4000 33D4000 33D4501 33D4501 26D7061 26D7061 26D7060 26D7060 26D7062 26D7062 BLO24T BLO24TB DFX32C 33D5000 33D5501 26D7065...
  • Page 36: Dfx24C Milli-Volt Dfx24C Manual

    ILLUSTRATED PARTS BREAKDOWN DFX24C MILLI-VOLT DFX24C MANUAL Failure to position the parts in accordance with these diagrams or failure to use only parts specifi cally approved with this appliance may result in property damage or personal injury. 33D4047...
  • Page 37: Replacement Parts List

    REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. ITEM DESCRIPTION Burner/Grate Assembly Injector Venturi Control Knob Milli-Volt Valve Manual Control Valve Pressure Valve Regulator Burner to Valve Tube Tube Fitting, 3/8 x 5/16 Regulator Valve Tube, 5/16 ODS Pilot Valve Tube, 3/16 Piezo Ignitor Piezo Wire ODS Pilot Assembly...
  • Page 38: Dfx32C Milli-Volt Dfx32C Manual

    ILLUSTRATED PARTS BREAKDOWN DFX32C MILLI-VOLT DFX32C MANUAL Failure to position the parts in accordance with these diagrams or failure to use only parts specifi cally approved with this appliance may result in property damage or personal injury. 33D4047...
  • Page 39 REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. ITEM DESCRIPTION Burner/Grate Assembly Injector Venturi Control Knob Milli-Volt Valve Manual Control Valve Pressure Valve Regulator Burner to Valve Tube Tube Fitting, 3/8 x 5/16 Regulator Valve Tube, 5/16 ODS Pilot Valve Tube, 3/16 Piezo Ignitor Piezo Wire ODS Pilot Assembly...
  • Page 40: Dbx24C T-Stat

    ILLUSTRATED PARTS BREAKDOWN DBX24C T-STAT Failure to position the parts in accordance with these diagrams or failure to use only parts specifi cally approved with this appliance may result in property damage or personal injury. 33D4047...
  • Page 41 REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. ITEM DESCRIPTION Burner Injector ODS Pilot Valve Tube, 3/16 ODS Pilot Assembly T-stat Control Valve Pressure Valve Regulator Piezo Wire Burner Valve Tube, 1/4 Piezo Ignitor LOG SET #1 Front Log PARTS AVAILABLE, NOT SHOWN Tube Nut, 1/4 Tube Ferrule, 1/4 NPT Tube Fitting, 3/8 x 1 1/2...
  • Page 42: Troubleshooting

    Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM POSSIBLE CAUSE When ignitor button is 1. Ignitor electrode positioned wrong. pressed, there is no spark at ODS/pilot. 2. Ignitor electrode is broken. 3. Ignitor electrode not connected to ignitor 4.
  • Page 43 TROUBLESHOOTING If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backfi re when lit. If the gas quality or pressure is low, contact your local gas supplier immediately. OBSERVED PROBLEM POSSIBLE CAUSE ODS/pilot lights, but fl...
  • Page 44: Warranty

    This warranty is expressly in lieu of other warranties, express or implied, including the warranty of mer- chantability of fi tness for purpose and of all other obligations or liabilities. Monessen Hearth Systems, Inc. does not assume for it any other obligations or liability in connection with the sale or use of the appliance.