Desa LSF20NT Safety Information And Installation Manual

Also see for LSF20NT: Safety information and installation manual Safety information and installation manual

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Desa LSF20NT Safety Information And Installation Manual Manual pdf 14 page image

www.desatech.com 116307-01B14OPERATING HEATERContinuedIf pilot flame pattern is incorrect, as shown inFigure 19• turn heater off (see To Turn Off Gas to Ap-pliance, page 13)• see Troubleshooting, page 16Note: The pilot flame on natural gas units willhave a slight curve, but flame should be blue andhave no yellow or orange color.Figure 19 - Incorrect Pilot Flame PatternFigure 18 - Correct Pilot Flame PatternThermocouplePilot BurnerPilot BurnerThermocoupleBlue Pilot FlameYellow Pilot FlameBURNER FLAME PATTERNWARNING: If yellow tippingoccurs, your heater could pro-duce increased levels of carbonmonoxide.NOTICE: Do not mistake orangeflames with yellow tipping. Dirtor other fine particles enter theheater and burn causing briefpatches of orange flame.THERMOSTAT CONTROLOPERATIONThe thermostatic control used on these modelsdiffers from standard thermostats. Standardthermostats simply turn on and off the burner.The thermostat used on this heater senses theroom temperature. At times the room mayexceed the set temperature. If so, the burnerwill shut off. The burner will cycle back onwhen room temperature drops below the settemperature. The control knob can be set toany heat level between 1 and 5. This adjusts theamount of gas flow to the burner that increasesor decreases the burner flame height.Note: The thermostat sensing bulb measuresthe temperature of air near the heater cabinet.This may not always agree with room tem-perature (depending on housing construction,installation location, room size, open air tem-peratures, etc.) Frequent use of your heater willlet you determine your own comfort levels.MANUAL LIGHTINGPROCEDURE1. Remove front panel (see Figure 10, page 9).2. Follow steps 1 through 7 under LightingInstructions, page 13.3. With control knob pressed in, strike match.Hold match to pilot until pilot lights.4. Keep control knob pressed in for 30 secondsafter lighting pilot. After 30 seconds, releasecontrol knob. Now follow step 9, underLighting Instructions, page 13.5. Replace front panel.INSPECTING HEATERCheck pilot flame pattern and burner flame pat-tern often.PILOT FLAME PATTERNFigure 18 shows a correct pilot flame pattern. Figure19 shows an incorrect pilot flame pattern. The incor-rect pilot flame is not touching the thermocouple.This will cause the thermocouple to cool. When thethermocouple cools, the heater will shut down.