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Sunday, 21 January 2018 21:13

How To Check a Gas Furnace Pilot Light

Gas Furnace Standing Pilot FlameWhile electronic ignition furnaces have been around for a while now, you may still have a gas furnace with a standing pilot light that remains lit all the time. The standing pilot light works in conjunction with a thermocouple to control the ignition of the burners and the flow of gas. The thermocouple senses if the pilot flame is hot enough to ignite the fuel to the burner.

If you have an old furnace that uses a pilot light, it needs to be kept clean burning and properly adjusted to ensure that the furnace operates safely and efficiently.

Inspecting a Gas Furnace Pilot Light Flame

Remove the furnace cover panel to expose the burner assembly and pilot. You should be able to clearly see the flame of the pilot light. The first thing to check is the color of the flame.
  • A natural gas flame should be a bright blue color with a small amount of yellow at the very tip.
  • A propane flame will have more of a bluish-green flame with a tinge of yellow at the tip.
  • The flame should strong enough to cover about 1/2 inch at the end of the thermocouple tip.
  • If the flame is too strong and not adjusted correctly, it will be blue and may make a hissing sound as the flame crosses the thermocouple. The pilot should be adjusted to reduce the intensity of the flame.
  • A yellow flame is caused by lack of oxygen and incomplete combustion. If the pilot light is a weak yellow flame it will not get hot enough to heat the thermocouple to the temperature needed to enable the gas valve to open. This is often caused by a dirty pilot tube tip.
  • A split flame is usually caused by a dirty pilot tube.
  • A flickering or wavering flame is usually caused by a draft. Check to see if there are sources of drafts in the room and take steps to reduce the effects on the furnace.
Have questions about your gas furnace or boiler? Call Air Specialties Air Conditioning and Heating.
Published in Heating
Tuesday, 19 September 2017 22:28

How Long Does a Furnace Last?

Connecticut Furnace ServiceAs cold weather arrives in Connecticut area and you get ready to turn on your trusted old gas furnace, you may be wondering just how many heating seasons the furnace has left. The average lifespan of a gas furnace is approximately 20 years. There are several factors that determine how long your furnace will last, including whether it is a lower cost or more expensive higher end model. If it's a lower cost furnace it may be ready for replacement in as little as 8 years.

Thankfully, many of the factors that determine how long a furnace will last are under your control. The most important thing you can do is have your furnace professionally maintained every year. This will not only make the furnace last longer, it will help it operate more efficiently and reduce the cost of unexpected repairs.

Because most gas furnace parts can be replaced as they wear out, it's usually a good idea to repair the unit as parts wear out. The one part that usually ends the life of a furnace is the heat exchanger. Constant heating and cooling will eventually cause the heat exchanger to rust out or crack, leading to failure. With new gas furnaces operating at much higher efficiency than units made just 10 years ago, replacing the furnace may be more cost effective in the long run when compared to the repair cost of keeping a 10-15 year old furnace running.

Have questions about your furnace? Give Air Specialties a call, we're here to help.
Published in Heating
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