www.desatech.com 110021-01N2SAFETy INFORMATIONTABLE OF CONTENTSSafety Informa ion ............................................... 2Product Identification ........................................... 5Optional Remote Control Accessories ................. 5Local Codes......................................................... 5Unpacking............................................................ 6Product Features ................................................. 6Air For Combustion and Ventilation ..................... 6Installation ........................................................... 8Operating Heater ............................................... 20Inspecting Burners............................................. 25Cleaning and Maintenance ................................ 26Troubleshooting ................................................. 28Optional Positioning of Thermostat Sensing Bulb....32Wiring Diagram .................................................. 33Specifications .................................................... 34Illustrated Parts Breakdown and Parts List........ 35Replacement Parts ............................................ 40Technical Service............................................... 40Service Hints ..................................................... 40Accessories ....................................................... 41WARNING: Improper in-stallation, adjustment, al-teration, service or main-tenance can cause in-jury or property damage.Refer to this manual forcorrect installation andoperational procedures.For assistance or addi-tional information con-sult a qualified installer,service agency or the gassupplier.WARNING: This is anunvented gas-fired heat-er. It uses air (oxygen)from the room in whichit is installed. Provisionsfor adequate combustionand ventilation air mustbe provided. Refer to Airfor Combustion and Ven-tilation section on page 6of this manual.WARNING: This applianceis for installation only in asolid-fuel burning mason-ry or UL127 factory-builtfireplace or in a listed vent-less firebox enclosure. It isdesign-certified for theseinstallations in accordancewith ANSI Z21.11.2. Excep-tion: Do not install thisappliance in a factory-builtfireplace that includesinstructions stating it hasnot been tested or shouldnot be used with unventedgas logs.This appliance may be in-stalled in an aftermarket,*permanently located,manufactured (mobile)home, where not prohib-ited by local codes.This appliance is only foruse with the type of gasindicated on the ratingplate. This appliance isnot convertible for usewith other gases.* Aftermarket: Completion of sale, not forpurpose of resale, from the manufacturer