www.desatech.com109889-01B 19CLEANING ANDMAINTENANCEWARNING: Turn off heaterand let cool before cleaning.CAUTION: You must keepcontrol areas, burner and circu-lating air passageways of heaterclean. Inspect these areas ofheater before each use. Haveheater inspected yearly by aqualified service person. Heatermay need more frequent clean-ing due to excessive lint fromcarpeting, pet hair, beddingmaterial, etc.WARNING: Failure to keepthe primary air opening(s) ofthe burner(s) clean may result insooting or property damage,BURNER INJECTOR HOLDER ANDPILOT AIR INLET HOLEThe primary air inlet holes allow the properamount of air to mix with the gas. This providesa clean burning flame. Keep these holes clear ofdust, dirt, lint and pet hair. Clean these air inletholes prior to each heating season. Blocked airholes will create soot. We recommend that youclean the unit every three months during operationand have heater inspected yearly by a qualifiedservice person.We also recommend that you keep the burnertube and pilot assembly clean and free of dust anddirt. To clean these parts we recommend usingcompressed air no greater than 30 PSI. Your localcomputer store, hardware store or home centermay carry compressed air in a can. You can use avacuum cleaner in the blow position. If using com-pressed air in a can, please follow the directions onthe can. If you donʼt follow directions on the can,you could damage the pilot assembly.1. Shut off the unit, including the pilot. Allowthe unit to cool for at least thirty minutes.2. Inspect burner, pilot and primary air inletholes on injector holder for dust and dirt (seeFigure 30).3. Blow air through the ports/slots and holes inthe burner.4. Check the injector holder located at the endof the burner tube again. Remove any largeparticles of dust, dirt, lint or pet hair with asoft cloth or vacuum cleaner nozzle.5. Blow air into the primary air holes on theinjector holder.6. In case any large clumps of dust have now beenpushed into the burner repeat steps 3 and 4.Clean the pilot assembly also. A yellow tip on thepilot flame indicates dust and dirt in the pilot as-sembly. There is a small pilot air inlet hole abouttwo inches from where the pilot flame comes outof the pilot assembly (see Figure 31). With the unitoff, lightly blow air through the air inlet hole. Youmay blow through a drinking straw if compressedair is not available.Figure 31 - Pilot Inlet Air HoleFigure 30 - Injector Holder On OutletBurner TubeBurnerTubePrimary AirInlet HolePilot AssemblyPilot AirInlet HolePorts/SlotsInjectorHolderCABINETAir Passageways• Use a vacuum cleaner or pressurized air toclean.Exterior• Use a soft cloth dampened with a mild soapand water mixture. Wipe the cabinet to removedust.