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33D4051 

Piezo

Ignition

Fireplace Screen

Control

Knob

PRODUCT FEATURES

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.

Figure 1 - Unvented Gas Heater

(Control Access Door Shown Open)

On/Off 

Switch 

Summary of Contents for 24VFSC

Page 1: ...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...

Page 2: ...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...

Page 3: ...s 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...

Page 4: ...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...

Page 5: ...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...

Page 6: ...shut off at the valve IGN Valve 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 BT...

Page 7: ...TARTED 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...

Page 8: ...afe 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 licens...

Page 9: ...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 wi...

Page 10: ...ational 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 L...

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 cabine...

Page 12: ...elp 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 t...

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 Figu...

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 Mak...

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 a...

Page 16: ...or doors Installation must provide adequate ventilation and combustion air DO NOT INSTALL THE VFS MODEL IN A BEDROOM OR BATHROOM THE DBX MODEL MAY BE INSTALLED IN A BEDROOM BUT NOT IN A BATHROOM Loca...

Page 17: ...ay 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...

Page 18: ...e 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 b...

Page 19: ...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...

Page 20: ...ap 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...

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...

Page 22: ...all 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...

Page 23: ...nection 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 10...

Page 24: ...e 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...

Page 25: ...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 midd...

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 Figur...

Page 27: ...C One piece Log Figure 41 Correct Appearance of Flames 24DBXC Dime Size Rock Wool Checking burner flame 24DBXC model In normal operation at full rate after 15 minutes the following flame appearances s...

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 occur...

Page 29: ...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...

Page 30: ...s 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 run...

Page 31: ...nob 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...

Page 32: ...sh 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...

Page 33: ...gs 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 corre...

Page 34: ...rebox 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...

Page 35: ...ION QTY 24VFSC 24DBXC 32VFSC 1 Canopy 1 33D4000 33D4000 33D5000 2 Screen Assembly 1 33D4501 33D4501 33D5501 3 Left Firebrick Optional 1 33D4033 33D4033 33D5032 4 Center Firebrick Optional 1 33D4032 33...

Page 36: ...4 6 illustrated parts breakdown 24VFSC MILLI VOLT 24VFSC MANUAL warning Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this ap...

Page 37: ...0313 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 00K06...

Page 38: ...14 15 16 illustrated parts breakdown 32VFSC MILLI VOLT warning Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance m...

Page 39: ...to Valve Tube 1 33D5511 33D5511 8 Tube Fitting 3 8 x 5 16 1 11V0313 11V0313 9 ODS Pilot Valve Tube 3 16 1 49D0050 49D0050 10 Piezo Ignitor 1 14D0503 14D0503 11 Piezo Wire 1 00K0632 00K0632 Log Set 12...

Page 40: ...llustrated parts breakdown 24DBXC 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 pr...

Page 41: ...ntrol 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...

Page 42: ...meter 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 lo...

Page 43: ...e 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 burne...

Page 44: ...August 2008 33D4051 Rev 2 MHSC 149 Cleveland Drive Paris Kentucky 40361 www mhsc com...

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