Monessen Hearth DBX24NTC Installation And Operating Instructions Manual Download

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VENT-FREE FIREPLACE SYSTEMS

INSTALLATION AND OPERATING INSTRUCTIONS

READ AND SAVE THESE 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.

See page 9.

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.

Summary of Contents for DBX24NTC

Page 1: ...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 ...

Page 2: ...ur Safety Read Before Lighting 29 Manual Control Lighting Instructions 30 Thermostat Control Lighting Instructions 31 Milli Volt Control Lighting Instructions 32 Match Lighting Instructions 33 Cleaning and Servicing 34 Blower and Optional Equipment 34 Illustrated Parts Cabinet Accessories 35 DFX24C Milli Volt DFX24C Manual 36 DFX32C Milli volt DFX32C Manual 38 DBX24C T stat 40 Troubleshooting 42 W...

Page 3: ...res the appliance be located out of traffic and away from furniture and draperies 2 Children and adults should be alerted to the hazard of high surface temperature and should stay away to avoid burns or clothing ignition 3 Young children should be carefully supervised when they are in the same room with the appliance 4 Do not place clothing or other flammable material on or near the appliance 5 An...

Page 4: ...o allow odors to dissipate Any odors remaining after this initial break in period will be slight and will disappear with continued use 19 Input ratings are shown in BTU per hour and are for elevations up to 2 000 feet For elevations above 2 000 feet input ratings should be reduced 4 percent for each 1 000 feet above sea level Refer to the National Fuel Gas Code 20 The appliance and its appliance m...

Page 5: ...e 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 Figure 1 Unvented Gas Heater Control Access Door Shown Open On Off Switch ...

Page 6: ...e position to light maintain a standing pilot LOW HI Variable position corresponding to desired temperature Continued Model Number Type Gas Rate Number of Burners Max BTU Hr Min BTU Hr DFX24PMC Manual 22 000 17 000 1 DFX24PVC Milli Volt 22 000 17 000 1 DFX32PMC Manual 26 000 15 000 1 DFX32PVC Milli Volt 26 000 20 000 1 DBX24PTC T Stat 10 000 1 Milli Volt Pressure Regulator Pressure Setting 3 5 in ...

Page 7: ... STARTED Carefully inspect the contents for shipping damage If any parts are missing or damaged immediately inform the dealer from whom you purchased the appliance Do not attempt to install any part of the appliance unless you have all parts in good condition What you will need for installation You must have the following items available before proceeding with installation External regulator for p...

Page 8: ...installed for safe operation of the unit 3 Field wire main power supply to units with fan kit See the Electrical Section found in this manual Electrical connec tions should only be performed by an experienced licensed certified tradesman 4 Install optional ON OFF kit on units with millivolt control See installation instruc tions included with the kit and also See the Electrical Wiring section foun...

Page 9: ...T CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE a walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm 6 x 1011 kg per pa sec m2 or less with openings gasketed or sealed and b weather striping has been added on openable windows and doors and c caulking or sealant are applied to areas such as joints around windows and door frames betwee...

Page 10: ...National Fuel Gas Code ANSI Z223 1 1992 Section 5 3 or applicable local codes 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 BTU Hr 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 BTU Hr 151 2 12 x 12 x 8 x 1000 52800 BTU...

Page 11: ... Figure 14 page 14 and logs 4 Place rear firebrick panel on back wall of firebox Set bottom of panel behind the bracket tabs of the grate See Figure 4 5 Place one of the side firebrick panels in cabinet Line up the hole in the retainer clip with the hole inside the firebox Using Phillips screwdriver attach the retainer bracket to inside of firebox See Figure 5 6 Repeat step five for the other fire...

Page 12: ...help secure the corners 4 Repeat for other side NOTE If you do not attach the trim at the correct corners use a hammer and screwdriver to tap on the one end of the 90 angle bracket This will separate the two pieces of trim See Figure 8 5 Place assembled black trim on front of heater Using four 4 black screws secure black trim to sides of heater See Figure 8 Figure 6 Matching and Joining Corners of...

Page 13: ... meet See Figure 10 4 Hold the corners together securely Tighten screws on bracket with flat head screwdriver Make sure the corners are flush and there are no spaces Do not over tighten screws See Figure 11 5 Repeat for other side trim 6 Slide assembled trim over the top and down the sides of the fireplace Flush trim with front of fireplace as shown in Figure 12 7 Align holes in assembled trim wit...

Page 14: ... with the holes in the top frame assembly See Figure 15 3 Install the three 3 screws in owner s manual packaging which attach the canopy to the top frame assembly See Figure 15 4 Tighten all screws Make sure the canopy is level and secure Install top louver assembly Figure 14 Removing Fireplace Screen Frame Panel NOTE Fireplace screen must be removed to access log box and to install canopy Canopy ...

Page 15: ... 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 Lift grate and base assembly out of the firebox 5 Secure the firebox with two anchoring screws 3 16 x 11 4 length supplied with the fireplace system See Figure 17 Note If the unit is mounted on carpeting tile or combustible material without the hearth a metal or wooden base cov...

Page 16: ...s or doors Installation must provide adequate ventilation and combustion air DO NOT INSTALL THE DFX MODEL IN A BEDROOM OR BATHROOM THE DBX MODEL MAY BE INSTALLED IN A BEDROOM BUT NOT IN A BATHROOM Location should be out of high traffic areas and away from furniture and draperies due to heat from firebox Never obstruct the front opening of the unvented fireplace or restrict the flow of combustion a...

Page 17: ...may be placed against a combustible back wall 4 Floor Clearance The fireplace may not be installed onto any combustible flooring material such as carpeting vinyl or tile without the hearth or a min 22 Ga 0 030 metal or a minimum 1 2 wooden base covering the entire width and depth of the base Combustible material must be installed at least 1 away from the front face of the unit 5 Mantel clearances ...

Page 18: ...fireplace may be installed directly on a combustible floor or a raised platform of an appropriate height Do not place fireplace on carpeting vinyl tile or other soft floor coverings It may however be placed on flat wood plywood particle board or other hard surfaces Be sure fireplace rests on a solid continuous floor or platform with appropriate framing for support and so that no cold air can enter...

Page 19: ...e fasteners See Figure 26 5 The canopy must be installed for safe operation of the heater See page 14 for canopy installation details When finishing a custom cabinet mantel or other built in enclosure the opening size to accommodate the fireplace with trim installed is as follows FIREPLACE FRAMING DFX24C w trim DBX24C w trim DFX32C w trim H 25 25 3213 16 J 263 4 263 4 311 4 Figure 25 Custom Cabine...

Page 20: ...rap Pipe Nipple Cap Stainless Flexible Tube Figure 27 Gas Connection CAUTION 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 Pl...

Page 21: ... MILLIVOLT CONTROL Figure 30 The valve regulator controls the burner pressure which should be checked at the pressure test point Turn captured screw counter clockwise two or three turns and then place tubing to pressure gauge over test point Use test point A closest to gas inlet After taking pressure reading be sure and turn captured screw clockwise firmly to reseal Do not over torque Check for ga...

Page 22: ...wall switch or thermostat At the other end connect one wire to TP TH and one wire to TH The color of the wires does not matter Optional Wall Switch Thermostat or Remote Receiver Switch On Off Switch On Off Switch Wall Switch ODS Pilot Millivolt Valve Red TH 3 TP 1 TP TH 2 Figure 31 Wiring Diagram Red ODS Pilot Spade Terminal CAUTION Label all wires prior to disconnection when servicing controls Wi...

Page 23: ...nnection meter test leads to terminals as indicated A COMPLETE MILLIVOLT SYSTEM CHECK A Reading Thermostat contacts CLOSED Control Knob ON Main burner should be come ON a If the reading is more than 100 millivolts and the automatic valve still does not come on replace the control b If the closed circuit reading A reading is less than 100 milli volts determine cause for low reading proceed to Secti...

Page 24: ...fe 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 DO NOT sprinkle volcanic rock on the logs or around the pilot or the main burner This may cause sooting Only place volcanic rock on the floor of t...

Page 25: ...C 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 Install right middle log 4 on two pins on burner Rest right end of right middle log on the right front log 5 Install left middle log 5 on two pins on burner Rest left end of left middle log on left front log Pins Left...

Page 26: ... for correct pilot flame If the pilot flame does not touch the thermocouple then the main burner cannot function reliably See Figure 39 and 4 for incorrect shape of pilot flame MILLI VOLT CONTROL Figure 36 Correct Appearance of Pilot Flame Figure 37 Incorrect Appearance of Pilot Flame MANUAL AND THERMOSTAT CONTROL Figure 38 Correct Appearance of Pilot Flame Figure 39 Incorrect Appearance of Pilot ...

Page 27: ...2C One piece Log Figure 41 Correct Appearance of Flames DBX24C Dime Size Rock Wool CHECKING BURNER FLAME DBX24C MODEL In normal operation at full rate after 15 minutes the following flame appearances should be observed The flames inside the one piece log may be yellow The flames should extend approximately 2 4 above the log See Figure 41 DFX24C AND DFX32C MODELS In normal operation at full rate af...

Page 28: ... 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 The initial break in operation should last two to three hours with the burner at the highest setting Provide maximum ventila tion by opening windows or doors to allow odors to dissipate Any odo...

Page 29: ...l 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 C Use only your hand to push in or turn the gas control knob Never use tools If the knob will not push in or turn by hand don t try to repair it Call a qualified service technician Force or attempted repair may result in a fire or explosion D Do not use ...

Page 30: ...as go to the next step 6 From OFF position push in gas control knob slightly and turn counterclockwise to the IGN posi tion See Figure 45 Push in and hold control knob for 5 seconds NOTE If you are running the heater for the first time it will be necessary to press in the control knob for 30 seconds to allow air to bleed out of the gas piping 7 With the control knob pushed in push and release the ...

Page 31: ...knob does not pop out when released stop and immediately call your service technician or gas supplier If the ODS pilot will not stay lit after several tries push and turn the control knob clockwise to OFF Release and wait 15 seconds Repeat steps 6 through 9 10 Turn control knob to any position between LOW and HIGH The knob position controls the thermostat tem perature See Figure 48 11 The heater i...

Page 32: ...ush in and release the piezo ignitor button to light the pilot 8 Continue pushing the control knob in for a further 60 seconds to prevent the flame detector from shutting off the gas while the probe is warming up Release the control knob 9 Turn gas control knob counterclockwise to the ON position 10 After the pilot has been lit for one minute the burners can be turned on Turn the ON OFF switch to ...

Page 33: ...ogs handling carefully by holding gently at each end Gloves are recommended to prevent skin irritation from ceramic fibers If skin becomes irritated wash gently with soap and water See manual for correct log placement PERIODIC CLEANING See parts diagram for location of items discussed below Do not use cleaning fluid to clean logs or any part of heater Brush logs with soft bristle brush or vacuum w...

Page 34: ...irebox installation The blower must be installed prior to the installation of the unvented heater The electrical connections must be made before the firebox is framed and enclosed in the finished walls BRASS LOUVERS Optional brass louvers may be installed in place of the factory installed black louvers See installation instructions provided with the brass louvers FIREBRICKS Optional firebrick kits...

Page 35: ...TION 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 ...

Page 36: ...5 4 6 ILLUSTRATED PARTS BREAKDOWN DFX24C MILLI VOLT DFX24C MANUAL WARNING 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 ...

Page 37: ...V0313 11V0313 11V0313 9 Regulator Valve Tube 5 16 33D4512 33D4512 10 ODS Pilot Valve Tube 3 16 1 49D0050 49D0050 49D0050 49D0050 11 Piezo Ignitor 1 14D0503 14D0503 14D0503 14D0503 12 Piezo Wire 1 00K0632 00K0632 00K0632 00K0632 13 ODS Pilot Assembly 1 14D0473 14D0477 26D2529 14D0476 LOG SET 14 1 Left Log 1 33D4040 33D4040 33D4040 33D4040 15 2 Right Log 1 33D4041 33D4041 33D4041 33D4041 16 3 Rear L...

Page 38: ...16 17 18 ILLUSTRATED PARTS BREAKDOWN DFX32C MILLI VOLT DFX32C MANUAL WARNING 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 ...

Page 39: ...512 10 ODS Pilot Valve Tube 3 16 1 49D0050 49D0050 49D0050 49D0050 11 Piezo Ignitor 1 14D0503 14D0503 14D0503 14D0503 12 Piezo Wire 1 00K0632 00K0632 00K0632 00K0632 13 ODS Pilot Assembly 1 14D0473 14D0477 26D2529 14D0476 LOG SET 14 1 Right Front Log 1 33D5042 33D5042 33D5042 33D5042 15 2 Left Front Log 1 33D5043 33D5043 33D5043 33D5043 16 3 Rear Log 1 33D5044 33D5044 33D5044 33D5044 17 4 Right Mi...

Page 40: ...ILLUSTRATED PARTS BREAKDOWN DBX24C T STAT WARNING 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 ...

Page 41: ...ontrol Valve 1 11V0701 11V0701 6 Pressure Valve Regulator 1 24D0305 24D0306 7 Piezo Wire 1 00K0632 00K0632 8 Burner Valve Tube 1 4 1 33D4053 33D4053 9 Piezo Ignitor 1 18D0402 18D0402 LOG SET 10 1 Front Log 1 33D0066 33D0066 PARTS AVAILABLE NOT SHOWN Tube Nut 1 4 1 00F0079 00F0079 Tube Ferrule 1 4 1 00F0080 00F0080 NPT Tube Fitting 3 8 x 1 1 2 1 18D0310 18D0310 Flex Tube with Fittings 1 20H0022 20H...

Page 42: ... use 1 Not enough fresh air is available for ODS pilot to operate 1 Open window and or door for ventilation 2 Low line pressure 2 Contact local gas company 3 ODS pilot is partially clogged 3 Clean ODS pilot 4 Defective Thermopile 4 Check wire connections Check output should be 500 milli volts across TH TP and TP Terminals with ON OFF switches off 5 Restrictions in incoming air flow 5 Check for bot...

Page 43: ...ameter is too small 2 Burner orifice diameter is too small 3 Inlet gas pressure is too low 3 Inlet gas pressure is too low Burner backfires during combustion 1 Manifold pressure is too low 1 Contact local gas company 2 Burner orifice is clogged 2 Clean burner or replace burner orifice Slight smoke or odor during initial operation 1 Burner orifice is clogged or damaged 1 Clean burner or replace bur...

Page 44: ...taller in accordance with the installation instructions The Limited Lifetime Warranty will also be void if the appliance is not operated and maintained according to the operating instructions supplied with the appliance and does not extend to 1 firebox burner assembly damage by accident neglect misuse abuse alteration negligence of others including the installation thereof by unqualified installer...

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