www.desatech.com 113093-01H24BURNER PRIMARY AIR HOLESAir is drawn into the burner through the holesin the fitting at the burner entrance. Theseholes may become blocked with dust or lint.Periodically inspect these holes for any block-age and clean if needed. Blocked air holeswill create soot.MAIN BURNERPeriodically inspect all burner flame holes withthe heater running. All slotted burner flameholes should be open with yellow flame pres-ent. All round burner flame holes should beopen with a small blue flame present. Someburner flame holes may become blocked bydebris or rust, with no flame present. If so,turn off heater and let cool. Remove blockage.Blocked burner flame holes will create soot.CLEANING AND MAINTENANCEBurner TubePilot AssemblyPilot AirInlet HolePorts/SlotsBurnerTubeInjector Holder(May Be Brassor AluminumDepending onModel)Primary Air Inlet Holes(Shape of Holes MayVary by Model)Figure 33 - Injector Holder On OutletBurner TubeFigure 34 - Pilot Inlet Air HoleWARNING: Turn off heaterand let cool before cleaning.CAUTION: You must keepcontrol areas, burners andcirculating air passageways ofheater clean. Inspect these areasof heater before each use. Haveheater inspected yearly by a quali-fied service person. Heater mayneed more frequent cleaning dueto excessive lint from carpeting,pet hair, bedding material, etc.WARNING: Failure to keepthe primary air opening(s) ofthe burner(s) clean may result insooting and 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 clearof dust, dirt, lint and pet hair. Clean these air in-let holes prior to each heating season. Blockedair holes will create soot. We recommend thatyou clean the unit every three months duringoperation and have heater inspected yearly bya qualified service person.We also recommend that you keep the burnertube and pilot assembly clean and free of dustand dirt. To clean these parts we recommendusing compressed air no greater than 30 PSI.Your local computer store, hardware store orhome center may carry compressed air in acan. If using compressed air in a can, pleasefollow the directions on the can. If you don’tfollow directions on the can, you could dam-age 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(see Figures 33 and 34).INSPECTING BURNERSContinued