www.desatech.com 113183-01FSAFETy INFORMATIONTAbLE OF CONTENTSSafety Information ............................................... Local Codes......................................................... 4Product Identification ........................................... 5Unpacking............................................................ 5Product Features ................................................. 5Air For Combustion and Ventilation ..................... 5Installation ........................................................... 8Operating Heater ............................................... 16Inspecting Burners............................................. 18Technical Service............................................... 18Cleaning and Maintenance ................................ 19Troubleshooting ................................................. 0Optional Positioning of Thermostat Sensing Bulb....4Specifications .................................................... 5Replacement Parts ............................................ 5Service Hints ..................................................... 5Accessories ....................................................... 5Illustrated Parts Breakdown and Parts List........ 6Warranty Information ...........................Back CoverWARNING: Improper in-stallation, adjustment, al-teration, service or mainte-nance can cause injury orproperty damage. Refer tothis manual for correct in-stallation and operationalprocedures. For assis-tance or additional infor-mation consult a qualifiedinstaller, service agency orthe gas supplier.WARNING: This applianceis for installation only in asolid-fuel burning masonryor UL127 factory-built fire-place or in an 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 includes in-structions stating it has notbeen tested or should notbe used with unvented gaslogs. For unmarked facto-ry-built fireplaces, contactfireplace manufacturer ifunsure of this application.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 5of this manual.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