www.desatech.com 108382-01G2WARNING: Improper installation, adjustment, altera-tion, service or maintenance can cause injury or prop-erty damage. Refer to this manual for correct installationand operational procedures. For assistance or addi-tional information consult a qualified installer, serviceagency or the gas supplier.WARNING: This appliance is for installation only in asolid-fuel burning masonry or UL127 factory-built fire-place, or in a listed ventless firebox enclosure. It is de-sign certified for these installations in accordance withANSI Z21.11.2. Exception: Do not install this appliancein a factory-built fireplace that includes instructionsstating it has not been tested or should not be used withunvented gas logs.WARNING: This is an unvented gas-fired heater. It usesair (oxygen) from the room in which it is installed. Provi-sions for adequate combustion and ventilation air mustbe provided. Refer to Air for Combustion and Ventilationsection on page 5 of this manual.This appliance may be installed in an aftermarket,* per-manently located, manufactured (mobile) home, wherenot prohibited by local codes.This appliance is only for use with the type of gas indi-cated on the rating plate. This appliance is not convert-ible for use with other gases.* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturerState of Massachusetts: The installation must be made by a licensed plumber or gas fitter in theCommonwealth of Massachusetts.Sellers of unvented propane or natural gas-fired supplemental room heaters shall provide to eachpurchaser a copy of 527 CMR 30 upon sale of the unit.Vent-free gas products are prohibited for bedroom and bathroom installation in the Common-wealth of Massachusetts.TAbLE OF CONTENTSSafety Information ............................................... 3Product Identification ........................................... 4Local Codes......................................................... 5Unpacking............................................................ 5Product Features ................................................. 5Remote Rontrol Rccessories ............................... 5Air for Combustion and Ventilation ...................... 5Installation ........................................................... 8Operating Heater ............................................... 16Inspecting Burners ............................................ 19Cleaning and Maintenance ................................ 20Wiring Diagram .................................................. 21Specifications .................................................... 21Replacement Parts ............................................ 21Service Hints ..................................................... 21Technical Services ............................................. 21Troubleshooting ................................................. 22Accessories ....................................................... 25Illustrated Parts Breakdown and Parts List........ 26Warranty Information ...........................Back Cover