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VENT-FREE FIREPLACE SYSTEMS
INSTALLATION AND OPERATING INSTRUCTIONS
MODELS
DFX24
DBX24*
DFX32
Natural Gas or
Propane/LPG
Manual, Milli-Volt,
Thermostat Control
*Thermostat Control Only
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 9.
or
READ AND SAVE THESE INSTRUCTIONS
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.
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Table of Contents
Related Manuals for Monessen Hearth DFX24
Summary of Contents for Monessen Hearth DFX24
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Page 1: Installation And Operating Instructions
VENT-FREE FIREPLACE SYSTEMS INSTALLATION AND OPERATING INSTRUCTIONS MODELS DFX24 DBX24* DFX32 Natural Gas or Propane/LPG Manual, Milli-Volt, 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. -
Page 2: Table Of Contents
BLOWER AND OTHER OPTIONAL EQUIPMENT .................... 34 ILLUSTRATED PARTS BREAKDOWN AND CABINET ACCESSORIES ............35 ILLUSTRATED PARTS BREAKDOWN (DFX24 MILLI-VOLT, DFX24 MANUAL, DFX24 T-STAT) ...... 36 REPLACEMENT PARTS LIST (DFX24 MILLI-VOLT, DFX24 MANUAL, DFX24 T-STAT) ........37 ILLUSTRATED PARTS BREAKDOWN (DFX32 MILLI-VOLT, DFX32 MANUAL, DFX32 T-STAT) ...... 38 REPLACEMENT PARTS LIST (DFX32 MILLI-VOLT, DFX32 MANUAL, DFX32 T-STAT) ........ -
Page 3: Important Safety Information
IMPORTANT SAFETY INFORMATION INSTALLER OWNER Please leave these instructions with the owner. Please retain these instructions for future reference. IMPORTANT Read these instructions carefully before installing or trying to operate this vent-free gas heater. • Any change to this heater or its controls can be dangerous. •... - Page 4 IMPORTANT SAFETY INFORMATION 17. During manufacturing, fabricating and shipping, vari- This appliance may be installed in an aftermar- ous components of this appliance are treated with cer- ket, permanently located, manufactured (mobile) tain oils, films or bonding agents. These chemicals are home, where not prohibited by local codes.
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Page 5: Product Features
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. -
Page 6: Product Features And Specifications
PRODUCT FEATURES and SPECIFICATIONS NATURAL GAS Manual Pressure/T-Stat Milli-Volt Pressure Regulator Pressure Setting: 3 in. w.c. Regulator Pressure Setting: 3.5 in. w.c. Gas Inlet Pressure: Max. 10.5 in. w.c. Pilot Regulator: 3.5 in. w.c. Min. 5 in. w.c. Gas Inlet Pressure: Max. -
Page 7: Getting Started
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. -
Page 8: General Installation Information
“ELECTRICAL WIRING” section found in this manual. 5. Plumb gas line. Refer to the “CONNECTING THE GAS” section found in this manual. DFX24/DBX24 DFX32 (Gas connections should only be performed by an experienced, licensed / certified tradesman). - Page 9 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… American National Standards Institute, Inc. 1430 Broadway New York, NY 10018 National Fire Protection Association, Inc.
- 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: BTU/HR = (L1 + L2) Ft x (W) Ft x (H) Ft x 1000 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.
- Page 11 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.
- Page 12 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).
- Page 13 GENERAL INSTALLATION INFORMATION BRASS TRIM INSTALLATION (DFX32) 1. Remove trim from protective packaging. Be careful not to scratch the trim. Remove two (2) 90°-angled Top Trim Piece mounting brackets and two (2) 90°-angled shims. 45°-angled 2. Lay trim face down on the floor. Line up the 45°-angled Corners corners of the top trim with the 45°-angled corners of the side trims.
- Page 14 GENERAL INSTALLATION INFORMATION REMOVING SCREEN 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.
- Page 15 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.
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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. Refer to “CLEARANCES and HEIGHT REQUIREMENTS” section on page 17. Minimum clearances to combustibles must be maintained. •... -
Page 17: Clearances And Height Requirements
1. Sidewall Clearances — The clearance from the in- side of the appliance to any combustible adjacent wall should not be less than 9" for the DBX24/DFX24 or less than 15" for the DFX32. Refer to Figures 19 and 10"... -
Page 18: Fireplace Framing
Be sure fireplace rests on a solid continuous floor or platform with appropriate framing for support and so that no cold air can enter from under the firebox. Anchor fireplace to the side framing members using nailing flanges. DFX24 DBX24 DFX32... - Page 19 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: DFX24 w/ trim DBX24 w/ trim DFX32 w/trim Figure 26 - Custom Cabinet The fireplace must be installed giving...
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Page 20: Connecting The Gas
CONNECTING THE GAS 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. -
Page 21: Checking Gas Pressure
CHECKING GAS PRESSURE 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 Connecting directly to an connection. DO NOT USE AN OPEN FLAME. unregulated propane/LPG Check the gas pressure with the appliance burning and the control tank can cause an explosion. -
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. CAUTION Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify Pilot proper operation after servicing. - Page 23 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.
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Page 24: Log Placement
3. Install the center log (#2) behind the front log on the remaining set of locating pins. Visually check to verify the log is securely placed on the pins. Locating Bracket Tabs Locating Brackets Figure 34 - Proper Sequence of Log Installation (DFX24) 33D0237... - Page 25 LOG PLACEMENT PROPER INSTALLATION SEQUENCE (DBX24) Install one-piece log on two locating pins. One-piece Locating Locating 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.
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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 flame must always be present when the heater is in operation. It should just touch the top of the thermocouple tip for natural. -
Page 27: Checking The Burner Flame
In normal operation at full rate after 15 minutes, the following flame appearances should be observed: DFX32 MODEL DFX24 MODEL The rear flames above and inside log #2 may be yellow. The The rear flames above and behind log #2, and in front of log flames should extend approximately 2"... -
Page 28: Operating Instructions
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. -
Page 29: Operating Instructions
OPERATING INSTRUCTIONS 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. -
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. 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. -
Page 31: Thermostatic Control Lighting Instructions
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 clock- wise 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, refer to instructions for “MATCH LIGHTING INSTRUCTIONS”, page 33. -
Page 33: Match Lighting Instructions
OPERATING INSTRUCTIONS 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
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. -
Page 35: Illustrated Parts Breakdown And Cabinet Accessories
ILLUSTRATED PARTS BREAKDOWN FOR CABINET ACCESSORIES STANDARD FEATURES ITEM DESCRIPTION DFX/DBX24 DFX32 Canopy 33D0015 33D1022 Screen Assembly 33D0050 33D1066 Left Firebrick (Optional) 33D0202 33D1044 Center Firebrick (Optional) 33D0200 33D1042 Right Firebrick (Optional) 33D0201 33D1043 Blower (Optional) BLO-24 33D0237... -
Page 36: Illustrated Parts Breakdown (Dfx24 Milli-Volt, Dfx24 Manual, Dfx24 T-Stat)
ILLUSTRATED PARTS BREAKDOWN DFX24 MILLI-VOLT DFX24 MANUAL 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. 33D0237... -
Page 37: Replacement Parts List (Dfx24 Milli-Volt, Dfx24 Manual, Dfx24 T-Stat)
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. 33D0237... -
Page 38: Illustrated Parts Breakdown (Dfx32 Milli-Volt, Dfx32 Manual, Dfx32 T-Stat)
ILLUSTRATED PARTS BREAKDOWN DFX32 MILLI-VOLT DFX32 MANUAL 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. 33D0237... -
Page 39: Replacement Parts List (Dfx32 Milli-Volt, Dfx32 Manual, Dfx32 T-Stat)
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. 33D0237... -
Page 40: Illustrated Parts Breakdown (Dbx24 T-Stat)
ILLUSTRATED PARTS BREAKDOWN 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. 33D0237... -
Page 41: Replacement Parts List (Dbx24 T-Stat)
REPLACEMENT PARTS LIST REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. 33D0237... -
Page 42: Troubleshooting
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. REMEDY OBSERVED PROBLEM POSSIBLE CAUSE 1 Replace ignitor. When ignitor button is pressed, 1. - Page 43 TROUBLESHOOTING REMEDY POSSIBLE CAUSE OBSERVED PROBLEM 4. Hand tighten until snug, then tighten 4. Thermocouple connection loose at control 1/4 turn more. valve. 5. Contact local gas company. 5. Pilot flame not touching thermocouple, which allows thermocouple to cool, caus- ing pilot flame to go out.
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Page 44: Warranty
This warranty is expressly in lieu of other warranties, express or implied, including the warranty of mechantability of fitness 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. In states that do not allow limitations on how long an implied warranty lasts, or do not allow exclusion of indirect damages, those limitations of exclusions may not apply to you.