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DESA INTERNATIONAL
UNVENTED (VENT-FREE)
NATURAL GAS LOG HEATER
ALSO DESIGN-CERTIFIED AS A VENTED DECORATIVE APPLIANCE
OWNER'S OPERATION AND INSTALLATION MANUAL
CFS18NRA
VS18NRA
VS24NRA
VS30NRA
WARNING: 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 per-
formed by a qualified installer, service
agency, or the gas supplier.
WARNING: 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 Air for Combustion and Ventilation section on page 4 of this manual.
This appliance may be installed in an aftermarket* manufactured (mobile) home, where not prohibited by
state or local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Save this manual for future reference
18", 24", and 30"
WARNING: Improper installation, adjust-
ment, alteration, service, or maintenance
can cause injury or property damage.
Refer to this manual for correct installa-
tion and operational procedures. For
assistance or additional information
consult a qualified installer, service
agency, or the gas supplier.
WARNING: This appliance is for in-
stallation only in a solid-fuel burning
masonry or UL127 factory-built fire-
place, or in an approved ventless fire-
box. It is design-certified for these in-
stallations in accordance with ANS
Z21.11.2. Exception: Do not install this
appliance in a factory-built fireplace
that includes instructions stating it has
not been tested or should not be used
with unvented gas logs.
"A" Model
Remote-Ready
®
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Table of Contents
Related Manuals for Desa CFS18NRA
Summary of Contents for Desa CFS18NRA
- Page 1 DESA INTERNATIONAL UNVENTED (VENT-FREE) NATURAL GAS LOG HEATER ALSO DESIGN-CERTIFIED AS A VENTED DECORATIVE APPLIANCE OWNER’S OPERATION AND INSTALLATION MANUAL CFS18NRA VS18NRA VS24NRA VS30NRA WARNING: 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.
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Page 2: Safety Information
DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER SAFETY INFORMATION WARNINGS IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, oper- ate, or service this heater. Im- proper use of this heater can cause serious injury or death from burns, fire, explosion, electrical shock, and carbon monoxide poisoning. -
Page 3: Product Identification
PRODUCT IDENTIFICATION Front Log Front Burner Piezo Ignitor Control Knob Remote Flame Control Adjustment (Optional) Knob Figure 1 - VS24NR Shown LOCAL CODES Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of The National Fuel Gas Code ANS Z223.1, also known as NFPA 54*. -
Page 4: Air For Combustion And Ventilation
DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER AIR FOR COMBUSTION AND VENTILATION WARNING: This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for adequate combustion and ven- tilation air. Read the following in-... -
Page 5: Determining Fresh-Air Flow For Heater Location
AIR FOR COMBUSTION AND VENTILATION Continued DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION Determining if You Have a Confined or Unconfined Space Use this work sheet to determine if you have a confined or unconfined space. Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms. - Page 6 DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER AIR FOR COMBUSTION AND VENTILATION Continued VENTILATION AIR Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must pro- vide two permanent openings: one within 12"...
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Page 7: Installation
INSTALLATION NOTICE: This heater is intended for use as supplemental heat. Use this heater along with your pri- mary heating system. Do not in- stall this heater as your primary heat source. If you have a central heating system, you may run system’s circulating blower while using heater. - Page 8 DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER INSTALLATION Continued NOTICE: Manual control heaters may be used as a vented product. If so, you must always run heater with chimney flue damper open. If running heater with damper open, noncombustible material above fireplace opening is not needed.
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Page 9: Mantel Clearances
INSTALLATION Continued MANTEL CLEARANCES In addition to meeting noncombustible mate- rial clearances, you must also meet required clearances between fireplace opening and mantel shelf. If you do not meet the clear- ances listed below, you will need a hood. Determining Minimum Mantel Clearances If you meet minimum clearance between mantel shelf and top of fireplace opening, a... -
Page 10: Installing Damper Clamp Accessory For Vented Operation
DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER INSTALLATION Continued INSTALLING DAMPER CLAMP ACCESSORY FOR VENTED OPERATION Note: When used as a vented heater, appli- ance must be installed only in a solid-fuel burning fireplace with a working flue and constructed of noncombustible material. -
Page 11: Connecting To Gas Supply
INSTALLATION Continued 6. Attach base to fireplace floor using masonry screws (in hardware package). 7. Connect to gas supply. See Connect- ing To Gas Supply. Gas Control Flexible Gas Hose (if allowed by local codes) Figure 11 - Attaching Flexible Gas Hose to Heater Gas Regulator Masonry Screw... -
Page 12: Checking Gas Connections
DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER INSTALLATION Continued CHECKING GAS CONNECTIONS WARNING: Test all gas pip- ing and connections for leaks after installing or servicing. Cor- rect all leaks at once. WARNING: Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints. - Page 13 INSTALLATION Continued INSTALLING LOGS WARNING: Failure to posi- tion the parts in accordance with these diagrams or failure to use only parts specifically approved with this heater may result in prop- erty damage or personal injury. Each log is marked with a number. These numbers will help you identify the log when installing.
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Page 14: Operating Heater
DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER OPERATING HEATER FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: If you do not fol- low these instructions exactly, a fire or explosion may result caus- ing property damage, personal injury or loss of life. -
Page 15: To Turn Off Gas To Appliance
OPERATING HEATER Continued 8. Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob. • If control knob does not pop out when released, contact a qualified service person or gas supplier for repairs. -
Page 16: Optional Remote Operation
DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER OPERATING HEATER Continued OPTIONAL REMOTE OPERATION Note: All remote control accessories must be purchased separately (see Accessories, page 25). Follow instructions included with the remote control. Thermostat Control Operation (Optional GHRCT Only) The thermo-... -
Page 17: Inspecting Burners
INSPECTING BURNERS Check pilot flame pattern and burner flame patterns often. PILOT FLAME PATTERN Figure 24 shows a correct pilot flame pat- tern. Figure 25 shows an incorrect pilot flame pattern. The incorrect pilot flame is not touching the thermocouple. This will cause the thermocouple to cool. -
Page 18: Cleaning And Maintenance
This will protect your warranty coverage for parts replaced under warranty. PARTS UNDER WARRANTY Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International’s Techni- cal Service Department at 1-800-323-5190. When calling DESA International, have ready • your name •... -
Page 19: Troubleshooting
TROUBLESHOOTING Note: For additional help, visit DESA International’s Technical Service web site at www.desatech.com. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM When ignitor button is pressed, there is no spark at ODS/pilot When ignitor button is pressed, there is... - Page 20 DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER TROUBLESHOOTING Continued OBSERVED PROBLEM One or both burners do not light after ODS/ pilot is lit Delayed ignition of one or both burners Burner backfiring during combustion Yellow flame in front burner during burner...
- Page 21 TROUBLESHOOTING Continued 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. Follow the gas supplier’s instructions.
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Page 22: Illustrated Parts Breakdown
DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER ILLUSTRATED PARTS BREAKDOWN VARIABLE CONTROL CFS18NRA, VS18NRA VS24NRA, VS30NRA 104416... -
Page 23: Parts List
PARTS LIST VARIABLE CONTROL CFS18NRA, VS18NRA VS24NRA, VS30NRA VS18NRA/CFS18NRA 104388-01 104390-01 104392-01 104394-01 M11084-26 103779-01 098249-01 103780-01 101330-01 101008-01 101007-01 100999-04 103984-01 098271-07 102445-01 103588-01 103782-01 M12461-26 103781-01 098264-02 103784-02 103784-01 103587-01CK M11084-26 099387-12 100609-01 101004-11 101004-11 103783-01 099998-01 103284-02... -
Page 24: Specifications
SERVICE You may have further questions about in- stallation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-DESA LOG (1-800-337-2564). You can also visit DESA International’s Technical Services site www.desatech.com. SERVICE HINTS When Gas Pressure Is Too Low •... - Page 25 ACCESSORIES Purchase these heater accessories from your local dealer. If they can not supply these accessories, call DESA International’s Parts Department at 1-800-972-7879 for referral information. You can also write to the ad- dress listed on the back page of this manual.
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Page 26: Warranty Information
VENT-FREE NATURAL GAS LOG HEATERS DESA International warrants this product to be free from defects in materials and components for four (4) years and five (5) years on stainless steel burners from the date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions.