Desa FVFM27NR Owner's Operation And Installation Manual

Also see for FLAME-MAX FVFM27NR: OWNER'S OPERATION AND INSTALLATION MANUAL OWNER'S OPERATION AND INSTALLATION MANUAL

Contents

Desa FVFM27NR Owner's Operation And Installation Manual Manual pdf 21 page image

www.desatech.com110398-01D 21INSPECTING bURNERSFigure 28 - Correct Pilot Flame Pattern(Propane/LP Pilot Shown)Pilot BurnerThermocouplePilot BurnerThermocoupleFigure 29 - Incorrect Pilot Flame Pattern(Propane/LP Pilot Shown)If burner flame pattern is incorrect as shownin Figure 31• turn heater off (see To Turn Off Gas to Ap-pliance, page 19)• see Troubleshooting, page 24Figure 30 - Correct Flame PatternFigure 31 - Incorrect Flame PatternCheck pilot flame pattern and burner flamepatterns often.PILOT FLAME PATTERNFigure 28 shows a correct pilot flame pattern.Figure 29 shows an incorrect pilot flame pat-tern. The incorrect pilot flame is not touchingthe thermocouple. When the thermocouplecools, the heater will shut down.If pilot flame pattern is incorrect, as shownin Figure 29• turn heater off (see To Turn Off Gas to Ap-pliance, page 19)• see Troubleshooting, page 24Note: The pilot flame on natural gas units willhave a slight curve, but flame should be blueand have no yellow or orange color.BURNER 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.BURNER FLAME PATTERNFigure 30, shows a correct burner flame pat-tern. Figure 31, shows an incorrect burnerflame pattern.