Burner Trouble and Remedy


              POSSIBLE CAUSE


Yellow flame or yellow tipped flame

Lack of primary air.

  1. Open air shutter wider, or clean it thoroughly if blocked with dust.
  2. Check orifice drilling to make sure gas stream enters center of mixing tube.
  3. Check gas valve to make sure it is mounted straight.
  4. Check mixing tube for obstructions.
  5. Check length and diameter of mixing tube.
  6. Reduce orifice size if too large.

Orange flame.

Particles of dust or dirt in mixing tube being carried through burner ports.

  1. Needs correction only in exceptional cases where inside of burner is very dirty. Clean inside of burner with small brush and blow out with air.

Individual flames lift above burner ports.

Too much primary air or burner ports crowded beyond capacity.

  1. Reduce amount of primary air. Install smaller orifice if burner is operated beyond capacity.

Flash back. Flame burns inside the mixing tube.

Burner ports too large or too shallow. Burner head too hot. Too much primary air. Flame throttled too low.

  1. Replace burner if ports are too large or too shallow.
  2. A slotted burner may eliminate the trouble.
  3. Reduce primary air if possible.
  4. Increase minimum or bypass air supply

Delayed ignition or slow lighting

Pilot flame improperly located. Improper port spacing. Too much primary air.

  1. Check location of pilot flame and change if necessary.
  2. Check port spacing and change burner if not correct.
  3. (c)Reduce primary air supply.

Gas odor: leak in burner. Leak through shut-off valve or thermostat. Delayed ignition. Combustion odor: Lack of secondary air or flame impingement.

  1. Check for leaks. Repair leaks with Teflon or any gasket paste.
  2. Check burner orifice with soapy water.
  3. If gas is escaping, check valve or thermostat.
  4. Check lighting. If slow, apply remedies suggested for No. (5).
  5. Check for five characteristics of satisfactory burner flame. Make sure vent passages are clear. See that burner gets an ample supply of secondary air. If flame impinges too much on a cool surface, provide for greater distance above burner head.
  6. Check burner grates to see if they obstruct the products of combustion.

Floating flame.

Lack of secondary air.

  1. Check vent passages for obstruction.
  2. Check for adequate air intake to combustion zone.
  3. Check for adequate space between burner and surface being heated.

Flame “reaching” for air.

Ports too close together or, with three rows of ports, inside ports may not get enough secondary air.

  1. Check design of burner for port spacing. If entire flame floats, apply remedies suggested in No. (7)

Ports too large or too shallow. Burner head too hot. Flame burning inside the burner. A burr in the orifice. Improper drilling of orifice.

  1. Check burner specifications. Replace if ports are too large or too shallow.
  2. If cool operation of burner head cannot be obtained, the burner should be replaced by one of proper design.
  3. See remedies suggested for No. (4).
  4. Clean orifice if there is any obstruction.
  5. Replace orifice fitting if necessary, making sure to drill it carefully.

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