www.desatech.com 111347-01FSAFETy INFORMATIONCONTENTSSafety Information ............................................... Local Codes......................................................... 4Unpacking............................................................ 4Product Identification ........................................... 5Product Features ................................................. 5Air For Combustion and ventilation ..................... 5Installation ........................................................... 8Operating heater................................................ 16Manually-Controlled Models .............................. 16Inspecting burners ............................................. 0Cleaning and Maintenance ................................ 1Troubleshooting ................................................. Optional Positioning of ThermostatSensing Bulb ............................................... 5Specifications .................................................... 6Accessories ....................................................... 7Service Hints ..................................................... 7Technical Service............................................... 7Replacement Parts ............................................ 7Illustrated Parts Breakdown and Parts List........ 8Warranty Information ...........................Back CoverWARNING: Improper in-stallation, adjustment, al-teration, service or main-tenance can cause injuryor property damage. Referto this manual for correctinstallation and operation-al procedures. For assis-tance or additional infor-mation consult a qualifiedinstaller, service agencyor the gas supplier.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 accor-dance with ANSI Z21.11.2.Exception: Do not installthis appliance in a fac-tory-built fireplace thatincludes instructions stat-ing it has not been testedor should not be used withunvented gas logs.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