Desa GWN20TB Safety Information And Installation Manual

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Desa GWN20TB Safety Information And Installation Manual Manual pdf 17 page image

www.desatech.com124002-01C 17oPeRaTIoNContinuedBURNER 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.Figure 26 shows a correct burner flame pattern.Figure 27 shows an incorrect burner flame pat-tern. The incorrect burner flame pattern showsyellow tipping of the flame. It also shows theflame higher than 1/2 the glass panel height.If burner flame pattern is incorrect, as shownin Figure 27• turn heater off (see To Turn Off Gas ToAppliance, page 16)• see Troubleshooting, page 19INsPeCTING HeaTeRFigure 25 - Incorrect Pilot Flame PatternFigure 24 - Correct Pilot Flame PatternFigure 26 - Correct Burner Flame PatternYellowTippingFigure 27 - Incorrect Burner Flame Pattern1/2 GlassHeight1/2 GlassHeightBlueFlameCheck pilot flame pattern and burner flamepattern often.PILOT FLAME PATTERNFigure 24 shows a correct pilot flame pattern.Figure 25 shows an incorrect pilot flame pat-tern. The incorrect pilot flame is not touchingthe thermocouple. This will cause the thermo-couple to cool. When the thermocouple cools,the heater will shut down.If pilot flame pattern is incorrect, as shownin Figure 25• turn heater off (see To Turn Off Gas to Ap-pliance, page 16)• see Troubleshooting, page 19Note: The pilot flame on natural gas units willhave a slight curve, but flame should be blueand have no yellow or orange color.Thermocouple Pilot BurnerPilot BurnerThermocoupleBlue FlameYellow FlameExtension CordUse extension cord if needed. The cord musthave a three-prong, grounding plug and athree-hole receptacle. Make sure cord is ingood shape. It must be heavy enough to carrythe current needed. An undersized cord willcause a drop in line voltage. This will result inloss of power and overheating. Use a No. 16AWG cord for lengths less than 50 feet.CAUTION: Verify proper op-eration after servicing.Operating BlowerThe blower is connected to a thermostat. Whenunit heats up, the blower will operate. A few Figure 23 - Wiring Diagram For BlowerAccessoryThermostatSensorSwitchGreenWhiteGreenWhite110/115V.A.C. BlowerMotorBlack Blackminutes after unit cycles off or is turned off,blower will shut off. Blower will cycle on and offin this manner. Note: If you have a heater witha thermostat, the heater and blower will not turnoff and on at exactly the same time. Blower cycletimes will vary with heat setting selected.