Monessen Hearth DFX24C Installation & Operating Instructions Manual
Monessen Hearth DFX24C Installation & Operating Instructions Manual

Monessen Hearth DFX24C Installation & Operating Instructions Manual

Dfx, dbx vent-free fireplace systems

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DFX, DBX Vent-Free
Fireplace Systems
Installation & Operating Instructions
Models:
DFX24C, DFX32C, DBX24C
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.
– Do not store or use gasoline or other
flammable 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 fire department.
– Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
334051
VFS DBX cover
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. Refer to Page
7.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future refer-
ence.
33D4047 1/11 Rev. 7

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Summary of Contents for Monessen Hearth DFX24C

  • Page 1 DFX, DBX Vent-Free Fireplace Systems Installation & Operating Instructions Models: DFX24C, DFX32C, DBX24C WARNINGS If the information in this manual is not followed exactly, a fire or explosion may 334051 result causing property damage, personal VFS DBX cover injury or loss of life.
  • Page 2: Table Of Contents

    IMPORTANT: Read all instructions and warnings carefully before starting installation. Failure to follow these instructions may result in a possible fire hazard and will void the warranty. DFX24C and DFX32C gas log appliances described in this manual feature the TRIPLE PLAY BURNER SYSTEM technology producing a full random yellow flame, full depth ember bed and glowing logs.
  • Page 3: Important Safety Information

    IMPORTANT SAFETY INFORMATION DFX & DBX Series Vent Free Fireplaces OWNER INSTALLER Please retain these instructions for future reference. Please leave these instructions with the appliance. • 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.
  • Page 4: Code Approval

    IMPORTANT SAFETY INFORMATION DFX & DBX Series Vent Free Fireplaces The initial break-in operation should last two to three THIS APPLIANCE MAY BE INSTALLED IN AN hours with the burner at the highest setting. Provide AFTERMARkET, PERMANENTLY LOCATED, maximum ventilation by opening windows or doors to MANUFACTURED (MOBILE) HOME, WHERE NOT allow odors to dissipate.
  • Page 5: Product Features

    PRODUCT FEATURES DFX & DBX Series Vent Free Fireplaces GAS SPECIFICATIONS Input BTU/hr Model Fuel Control Max. Min. Fireplace Screen 4DFXNMC Nat. Manual ,000 15,000 4DFXPMC Manual ,000 17,000 4DFXNVC Nat. Millivolt ,000 17,000 4DFXPVC Millivolt ,000 17,000 3DFXNVC Nat. Millivolt 6,000 0,000...
  • Page 6: Fireplace And Framing Dimensions

    DFX & DBX Series Vent Free Fireplaces Min. Rough Opening  Depth 1/2”  or 5/8” O - Min. Rough Opening Width Min. Rough Opening Height Figure 2 - Fireplace and Framing Dimensions Ref. DFX24C/DBX24C DFX32C 4Z\x" (6 mm) 3" (813 mm) Z\x" (57 mm) 8C\v" (730 mm) 6Z\x" (673 mm) 30"...
  • Page 7: Preinstallation Information

    PREINSTALLATION INFORMATION DFX & DBX Series Vent Free Fireplaces • Handle the gas log burner assembly by Do not install the heater: the grate only. Do not pick the unit up by • Where curtains, furniture, clothing, or the burners. other flammable objects are less than •...
  • Page 8: Installation Information

    FIREPLACE INSTALLATION DFX & DBX Series Vent Free Fireplaces FIREPLACE LOCATION 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 “Clear- ances”...
  • Page 9: Clearances

    FIREPLACE INSTALLATION DFX & DBX Series Vent Free Fireplaces Ensure that minimum clearances shown in Figures 5 and 6 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 10: Fireplace Installation

    FP2445 Ref. DFX24C DBX24C DFX32C Anchor fireplace to the side framing members using nail- 6C\v" 6C\v"...
  • Page 11: Secure Heater To Floor Or Hearth

    FIREPLACE INSTALLATION DFX & DBX Series Vent Free Fireplaces SECURING HEATER TO FLOOR OR HEARTH NOTE: Clearance requirements as detailed in “CLEARANCES and HEIGHt REquIREmENtS” section on Page 15 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.
  • Page 12: Connect The Gas

    FIREPLACE INSTALLATION DFX & DBX Series Vent Free Fireplaces NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult all local codes. Use new black iron or steel pipe. Internally tinned copper or copper tubing can be used per National Fuel Code, section 2.6.3, providing gas meets hydrogen sulfide limits, and where permitted by local codes.
  • Page 13: Checking Gas Pressure

    FIREPLACE INSTALLATION DFX & DBX Series Vent Free Fireplaces When tightening the joint to the valve, hold the valve securely to prevent movement. 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.
  • Page 14: Electrical Wiring (Millivolt)

    ELECTRICAL INSTALLATION DFX & DBX Series Vent Free Fireplaces ODS Pilot On/Off Switch Pilot Wall Switch Valve On/Off Switch Spade Terminal TH = 3 TP = 1 TP/TH =  Figure 14 - Wiring Diagram FP11 Switch Optional Wall Switch or Remote Receiver Label all wires prior to disconnection when servicing controls.
  • Page 15: Connect Remote Receiver

    ELECTRICAL INSTALLATION DFX & DBX Series Vent Free Fireplaces CONNECT REMOTE RECEIVER THESE INSTRUCTIONS SUPERCEDE THE SECTION ENTITLED “HEARTH MOUNT” IN THE MILLIVOLT HAND-HELD REMOTE INSTRUCTIONS SUPPLIED Velcro• WITH THE REMOTE. Figure 15 1. Remove bottom louvre door. . Connect the remote connectors located in the unit. 3.
  • Page 16: Final Installation

    FINAL INSTALLATION DFX & DBX Series Vent Free Fireplaces Do not operate the unit without the screen frame panel and canopy installed. Canopy Fireplace REMOVE SCREEN Screen Figure 16 1. Remove bottom louver. 2. Removing fireplace screen frame panel by pushing screen frame panel up and out.
  • Page 17: Log Placement

    Simply open the windows for a few hours to vent the odor. Right Log #1 DFX24C LOG PLACEMENT Figure 18 Left Log 1. Install the rear log (#3) on back of burner.
  • Page 18: Rock Wool Placement

    Install one-piece log on two burner pins. Figure 20 Pins PLACE ROCk WOOL One-piece Log DFX24C and DFX32C MODELS LG700 After installing logs, pull apart dime-size pieces of rock 32VFSC logs wool. Sprinkle rock wool evenly over burner ports. Wash hands after installing rock wool.
  • Page 19: Flame Appearance

    FLAME APPEARANCE DFX & DBX Series Vent Free Fireplaces 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. CHECk THE PILOT FLAME The pilot flame must always be present when the heater is in operation.
  • Page 20: Operating Instructions

    FLAME APPEARANCE DFX & DBX Series Vent Free Fireplaces CHECkING BURNER FLAME DFX24C and DFX32C MODELS In normal operation at full rate after 15 minutes, the follow- ing flame appearances should be observed: Burner will have a random pattern of yellow flames. Fig- ures 24 and 25.
  • Page 21: For Your Safety Read Before Lighting

    OPERATING INSTRUCTIONS DFX & DBX Series Vent Free Fireplaces 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, refer to match Lighting Instructions, Page 25.
  • Page 22: Manual Control Lighting Instructions

    OPERATING INSTRUCTIONS DFX & DBX Series Vent Free Fireplaces MANUAL CONTROL LIGHTING INSTRUCTIONS 1. STOP! Read the safety information. . Make sure the manual shutoff valve is fully open. 3. This heater is equipped with an ignition device (piezo) which automatically lights the pilot.
  • Page 23: Thermostatic Control Lighting Instructions

    OPERATING INSTRUCTIONS DFX & DBX Series Vent Free Fireplaces THERMOSTATIC CONTROL LIGHTING INSTRUCTIONS 1. STOP! Read the safety information . . Make sure the manual shutoff valve is fully open. 3. This heater is equipped with an ignition device (piezo) which automatically lights the pilot. 4.
  • Page 24: Millivolt Control Lighting Instructions

    OPERATING INSTRUCTIONS DFX & DBX Series Vent Free Fireplaces MILLIVOLT CONTROL LIGHTING INSTRUCTIONS 1. STOP! Read the safety information label. . 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, refer to instructions for match Lighting Instructions, Page 25.
  • Page 25: Match Lighting Instructions

    OPERATING INSTRUCTIONS and MAINTENANCE DFX & DBX Series Vent Free Fireplaces MATCH LIGHTING INSTRUCTIONS 1. 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.
  • Page 26: Troubleshooting

    TROUBLESHOOTING DFX & DBX Series Vent Free Fireplaces 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. REMEDY OBSERVED PROBLEM POSSIBLE CAUSE...
  • Page 27: Replacement Parts

    REPLACEMENT PARTS DFX & DBX Series Vent Free Fireplaces 5  DFXC/DBXC Firebox Parts 334051 Ref. Description Qty. DFX24C DBX24C DFX32C firebox parts Canopy 33D4000 33D4000 33D5000 Screen Assy. 33D4501 33D4501 33D5501 Left Firebrick (Optional) 6D7061 6D7061 6D7065 Center Firebirck (Optional) 6D7060...
  • Page 28 REPLACEMENT PARTS DFX & DBX Series Vent Free Fireplaces DFX24C MILLIVOLT & MANUAL CONTROL BURNER PARTS DFX24C Millivolt DFX24C Manual Ref. Description Qty. Natural Propane Natural Propane Burner/Grate Assy. 33D4043 33D4043 33D4043 33D4043 Injector 59D006 33D4046 59D006 33D4046 Venturi 58D0454...
  • Page 29 REPLACEMENT PARTS DFX & DBX Series Vent Free Fireplaces DFX32C MILLIVOLT BURNER PARTS DFX32C Millivolt Ref. Description Qty. Natural Propane Burner/Grate Assy. 33D5050 33D5050 Injector 33D5040 33D5039 Venturi 58D0454 33D4058 334051 ODS Pilot Assy. 14D0473 14D0477 32VFSC burner parts Millivolt Valve 14D0467 14D0468 Pressure Valve Regulator 14D0469...
  • Page 30: Dbx4C T-Stat Burner

    REPLACEMENT PARTS DFX & DBX Series Vent Free Fireplaces DBX24C T-STAT BURNER PARTS DBX24C T-Stat Ref. Description Qty. Natural Propane Burner 33D0070 33D0071 Injector 18D053 33D081 ODS Pilot Valve Tube, 3/16 334051 49D0050 49D0050 ODS Pilot Assy. 6D59 14D0476 24DBXC burner parts T-Stat Control Valve 11V0701 11V0701...
  • Page 31: Optional Accessories

    OPTIONAL ACCESSORIES DFX & DBX Series Vent Free Fireplaces FORCED AIR kIT If you are installing the forced air kit (Models BLO4-T, BLO4-TB or BLOT), see the installation instructions provided with the kit for electrical wiring requirements or the blower installation sec- tion.
  • Page 32: Optional Accessories

    FP51 Install Side Firebrick Panel bracket to inside of firebox. Figure 36 6. Repeat step five for the other firebrick side panel. BLACk TRIM INSTALLATION DFX24C/DBX24C FP2521 Rear Firebrick 1. Remove black trim from protective packaging. Remove install side brick Panel four (4) black screws and two () 90°...
  • Page 33: Trim Installation

    OPTIONAL ACCESSORIES DFX & DBX Series Vent Free Fireplaces 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. Figure 37. A rubber hammer or handle of a claw hammer will help secure the corners.
  • Page 34 OPTIONAL ACCESSORIES DFX & DBX Series Vent Free Fireplaces Assembled Trim Trim Flush with Front of Fireplace FP57 Figure 41 - Slide Assembled Trim Over Top of Heater FP2527 install trim Screws Screw Holes Screw Figure 42 - Secure Trim to Fireplace FP58 33D4047 FP2528...
  • Page 35: Warranty

    DFX & DBX Series Vent Free Fireplaces 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 pur- chase: Ceramic Fiber Logs, Catalytic Filter and Aluminized Burners.
  • Page 36 MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.com...

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