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VENTED DECORATIVE GAS LOG HEATER
OWNER'S OPERATION AND INSTALLATION MANUAL
WARNING: If the information in this manual is not fol-
lowed 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 quali-
fied installer, service agency or the gas supplier.
For more information, visit www.desatech.com
MVO24VNA, MVO24VPA,
MVO18VNA AND MVO18VPA
Save this manual for future reference.
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Table of Contents
Troubleshooting
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Summary of Contents for Desa Firewerks MVO18VNA
- Page 1 VENTED DECORATIVE GAS LOG HEATER OWNER’S OPERATION AND INSTALLATION MANUAL MVO18VNA AND MVO18VPA WARNING: If the information in this manual is not fol- lowed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
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Page 2: Table Of Contents
WARNING: Improper installation, adjustment, altera- tion, service or maintenance can cause injury or prop- erty damage. Refer to this manual for correct installation and operational procedures. For assistance or addi- tional information consult a qualified installer, service agency or the gas supplier. WARNING: This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-built fireplace, constructed of noncombustible material and... -
Page 3: Safety Information
SAFETY INFORMATION WARNING: This product con- tains and/or generates chemicals known to the State of California to cause cancer or birth defects or other reproductive harm. WARNING: Keep flue open when operating unit. IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate or service this log set. -
Page 4: Local Codes
SAFETY INFORMATION Continued You must operate this appliance with a fireplace screen in place. Make sure fireplace screen is closed before running appliance. Keep the appliance area clear and free from combustible ma- terials, gasoline and other flam- mable vapors and liquids. Children and adults should be alerted to the hazard of high tem- perature and should stay away to... -
Page 5: Product Identification
PRODUCT IDENTIFICATION 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 prop- erty damage or personal injury. Figure 1 - Product Identification 114924-01B Log Set Assembly www.desatech.com... -
Page 6: Installation
CHECK GAS TYPE Use the correct gas type (natural or propane/LP) for your unit. If your gas supply is not correct, do not instal in fireplace. Call dealer where you bought the appliance for proper type of appliance. WARNING: This appliance is equipped for (natural or pro- pane/LP) gas. -
Page 7: Installing Appliance
INSTALLATION Continued INSTALLING APPLIANCE WARNING: Special care is required if you are installing the unit into a sunken fireplace. You must raise the fireplace floor to allow access to gas log controls. This will insure adequate air flow and guard against sooting. Raise the fireplace floor using noncombustible material. - Page 8 CAUTION: Use only new, black iron or steel pipe. Internally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of 1/2" diameter or greater to allow proper gas vol- ume to heater. If pipe is too small, undue loss of volume will occur.
- Page 9 INSTALLATION Continued 3. Pressurize supply piping system by either opening propane/LP supply tank valve for propane/LP gas or opening main gas valve located on or near gas meter for natural gas or using compressed air. 4. Check all joints of gas supply piping system. Apply noncorrosive leak detection fluid to all joints.
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Page 10: Operating Appliance
INSTALLATION Continued Figure 11 - Placement of Embers OPERATING APPLIANCE FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: Keep flue open when operating unit. WARNING: If you do not fol- low these instructions exactly, a fire or explosion may result causing property damage, per- sonal injury or loss of life. -
Page 11: To Turn Off Gas To Appliance
OPERATING APPLIANCE Continued 10. Wait one minute and move switch to the ON position to light burner. Note: AUTO is only functional when using optional remote control accessory. 11. Set flame adjustment knob to any level between HI and LO. TO TURN OFF GAS TO APPLIANCE 1. - Page 12 Thermocouple Figure 15 - Correct Pilot Flame Pattern (Your pilot may vary from pilots shown) Figure 16 - Incorrect Pilot Flame Pattern (Your pilot may vary from pilots shown) www.desatech.com 114924-01B...
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Page 13: Troubleshooting
WARNING: Turn off appliance and let cool before servicing. Only a qualified service person should service and repair heater. CAUTION: Never use a wire, needle or similar object to clean ODS/pilot. This can damage ODS pilot unit. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM When ignitor button is pressed, there is no spark at ODS/pilot... -
Page 14: Wiring Diagram
OBSERVED PROBLEM ODS/pilot lights but flame goes out when control knob is re- leased Burner does not light after ODS/ pilot is lit Delayed ignition of burner Burner backfiring during com- bustion TROUBLESHOOTING Continued POSSIBLE CAUSE 1. Control knob not fully pressed in 2. -
Page 15: Troubleshooting
OBSERVED PROBLEM Dark orange flame in burner dur- ing burner combustion Slight smoke or odor during initial operation Produces a whistling noise when burners are lit White powder residue forming within burner box or on adjacent walls or furniture 114924-01B TROUBLESHOOTING Continued POSSIBLE CAUSE... - Page 16 WARNING: If you smell gas • Shut off gas supply. • 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. Fol- low the gas supplier’s instructions.
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Page 17: Service Hints
• the replacement part number 114924-01B ACCESSORIES Purchase these appliances from your local dealer. If they can not supply these accessories, call DESA at 1-866-672-6040 for referral information. You can also write to the address listed on the back page of this manual. -
Page 18: Illustrated Parts Breakdown
ILLUSTRATED PARTS BREAKDOWN MVO24VNA, MVO24VPA MVO18VNA, MVO18VPA www.desatech.com 114924-01B... -
Page 19: Parts List
111228-02 111228-02 114928-11 114928-12 GA6060 GA6060 115597-01 115597-01 112799-01 112799-01 901242-01 901242-01 ** Not a field replaceable part. 114924-01B PARTS LIST PART NUMBER MVO18VNA MVO18VPA 111808-02 111808-02 111817-02 111817-02 099998-01 099998-01 103784-02 103784-02 103784-01 103784-01 097159-04 097159-04 114942-01 114942-01 111796-01... -
Page 20: Limited Warranty
VENTED GAS LOG APPLIANCES DESA warrants this product to be free from defects in materials and components for four (4) years from the date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions.
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