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DESA INTERNATIONAL
UNVENTED (VENT-FREE)
PROPANE/LP GAS LOG HEATER
ALSO DESIGN-CERTIFIED AS A VENTED DECORATIVE APPLIANCE
OWNER'S OPERATION AND INSTALLATION MANUAL
CFS18PRA
VS18PRA
VS24PRA
VS30PRA
WARNING: If the information in this manual
is not followed exactly, a fire or explosion
may result causing property damage, per-
sonal 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.
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 Ventilatio n 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.
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 as-
sistance or additional information con-
sult a qualified installer, service agency,
or the gas supplier.
WARNING: This appliance is for installa-
tion only in a solid-fuel burning masonry
or UL127 factory-built fireplace, or in an
approved ventless firebox. It is design-
certified for these installations in accor-
dance with ANS Z21.11.2. Exception: Do
not install this appliance in a factory-built
fireplace that includes instructions stat-
ing it has not been tested or should not
be used with unvented gas logs.
"A" Model
18", 24", and 30"
Remote-Ready
®
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Table of Contents
Related Manuals for Desa CFS18PRA
Summary of Contents for Desa CFS18PRA
- Page 1 DESA INTERNATIONAL UNVENTED (VENT-FREE) PROPANE/LP GAS LOG HEATER ALSO DESIGN-CERTIFIED AS A VENTED DECORATIVE APPLIANCE OWNER’S OPERATION AND INSTALLATION MANUAL CFS18PRA VS18PRA VS24PRA VS30PRA WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, per- sonal injury, or loss of life.
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Page 2: Safety Information
DESA INTERNATIONAL UNVENTED PROPANE/LP 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
SAFETY INFORMATION Continued 24. This heater must not be connected to any external electrical source. 25. Operating heater above elevations of 4,500 feet may cause pilot outage. 26. To prevent performance problems, the use of a propane fuel tank of less than 100 lb. -
Page 4: Air For Combustion And Ventilation
DESA INTERNATIONAL UNVENTED PROPANE/LP 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: Ventilation Air
DESA INTERNATIONAL UNVENTED PROPANE/LP 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"... -
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 PROPANE/LP 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 clearances listed in Figure 6 you will need a hood. Determining Minimum Mantel Clearance 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 PROPANE/LP 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 Gas Control Flexible Gas Hose (if allowed by local codes) Figure 11 - Attaching Flexible Gas Hose to Heater Gas Regulator Masonry Screw Masonry Screw Figure 12 - Attaching Base to Fireplace Floor CONNECTING TO GAS SUPPLY NOTICE: A qualified service per- son must connect heater to gas supply. -
Page 12: Checking Gas Connections
DESA INTERNATIONAL UNVENTED PROPANE/LP GAS LOG HEATER INSTALLATION Continued Apply pipe joint sealant lightly to male threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe could result in clogged heater valves. CAUTION: Use pipe joint seal- ant that is resistant to liquid pe- troleum (LP) gas. -
Page 13: Installing Logs
INSTALLATION Continued INSTALLING LOGS WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this heater may result in property damage or personal injury. Each log is marked with a number. These numbers will help you identify the log when installing. -
Page 14: Operating Heater
DESA INTERNATIONAL UNVENTED PROPANE/LP 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 PROPANE/LP 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 25 shows a correct pilot flame pat- tern. Figure 26 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 PROPANE/LP 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.
- Page 22 DESA INTERNATIONAL UNVENTED PROPANE/LP GAS LOG HEATER ILLUSTRATED PARTS BREAKDOWN VARIABLE CONTROL CFS18PRA, VS18PRA VS24PRA, VS30PRA 104417...
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Page 23: Parts List
PARTS LIST This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 18 of this manual. CFS18PRA, VS18PRA VS24PRA, VS30PRA VS18PRA/CFS18PRA 104388-01 104390-01 104392-01 104394-01 M11084-26 103778-01 098249-01 103780-01... -
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 PROPANE 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.