www.desatech.com 116557-01A68. When burner remains lit, set heater at the desiredheat level by slightly depressing the control knoband turning it counterclockwise to the MED orHI settings (see Figure 5, page 5).9. If burner goes out, turn off gas. Slightly depressand turn control knob fully clockwise to OFF.Check fuel supply. If adequate fuel is available,restart heater beginning at step 1, page 5.FLAME PATTERNSFigure 6 shows a correct flame pattern. The burnerflame is mostly blue with a slight yellow coloringon the ends.Figure 7 shows an incorrect flame pattern. Theflame is mostly yellow. The incorrect flame patternresults from low gas pressure or from flashback.CAUTION: Running heaterbelow specified input rating maycause flashback. During flash-back, the burner flame is mostlyyellow. The flame will burn insidethe burner tube, causing a roar-ing noise. If flashback occurs,turn heater off. After burner tubecools, restart the heater.OPERATIONContinuedTO STOP HEATER1. Tightly close propane supply valve on propanetank(s). Allow heater to burn remaining fuelin hose.2. Shut off burner. Do this by pushing in thecontrol knob and turning clockwise to the OFFposition.TO RESTART HEATER1. Wait five minutes after stopping heater.2. Restart heater by following To Start Heater,page 5.WARNING: Review and un-derstand the warnings in theSafety Information section, page2. They are needed to safely op-erate this heater. Follow all localcodes when using this heater.200,000 BTU/HR HEATERTO START HEATER1. Before lighting pilot fully close the ball valve(turn knob fully clockwise).2. Fully open the valve on the propane cylinder andwait 15 seconds before proceeding to step 3.3. Depress red button on safety pilot valve admit-ting gas to the heater. Then push and releasethe ignitor button until the pilot lights.Slight YellowColoring onFlame EndsBurnerTubeBlueFlameFigure 6 - Correct Flame Pattern at HighPositionYellowFlameFlame InsideBurner Tube(makesroaringnoise)BlueFlameFigure 7 - Incorrect Flame Pattern DuringFlashback