UNVENTED (VENT-FREE)GAS LOG HEATEROWNER’S OPERATION ANDINSTALLATION MANUALSave this manual for future reference.Save this manual for future reference.WARNING: If the information in this manualis not followed exactly, a fire or explosionmay result causing property damage, per-sonal injury, or loss of life.— Do not store or use gasoline or otherflammable vapors and liquids in the vicinityof 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 notuse any phone in your building.• Immediately call your gas supplier from aneighbor’s phone. Follow the gassupplier’s instructions.• If you cannot reach your gas supplier, callthe fire department.— Installation and service must be performedby a qualified installer, service agency, orthe gas supplier.WARNING: Improper installation, adjust-ment, alteration, service, or maintenancecan cause injury or property damage. Re-fer to this manual for correct installationand operational procedures. For assis-tance or additional information consult aqualified installer, service agency, or thegas supplier.WARNING: This appliance is for installa-tion only in a solid-fuel burning masonryor UL127 factory-built fireplace, or in alisted ventless firebox enclosure. It is de-sign-certified for these installations in ac-cordance with ANSI Z21.11.2. Exception:Do not install this appliance in a factory-built fireplace that includes instructionsstating it has not been tested or should notbe used with unvented gas logs.WARNING: This is an unvented gas-fired heater. It uses air (oxygen) from the room in whichit is installed. Provisions for adequate combustion and ventilation air must be provided. RefertoAir for Combustion and Ventilation section on page 4 of this manual.For more information, visit www.desatech.comFor more information, visit www.desatech.comThis appliance may be installed in an aftermarket,* permanently located, manufactured(mobile) home, where not prohibited by local codes.This appliance is only for use with the type of gas indicated on the rating plate. This applianceis not convertible for use with other gases.* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturerAlso Design-Certified As Vented Decorative Appliances24" and 30" Remote-Ready ModelsMODELSLDL3924NRLDL3924PRLDL3930NRLDL3930PR