Electronic Ignition Furnaces Don’t Have Pilot Lights
Many homeowners attempting to troubleshoot or even repair a furnace just for the very first time are shocked in case they do not locate a standard “pilot light” (also recognized as an upright pilot). It is usually expected that any system that burns natural gas or maybe propane includes a small flame that consistently burns, which supplies the cause for igniting gasoline whenever the appliance’s controls provide gas to the primary burners.
In truth, pilot lamps are something of yesteryear for those gas powered furnaces and and other gas burning devices, like stoves plus water heaters. Today’s furnaces ignite the gasoline through various solutions, known collectively as electric ignition systems.
According to the age of its, your furnace is apt to get among the following 3 kinds of ignition methods.
Standing Pilot Ignition
You are likely familiar with an upright pilot light. It is a bit of blue flame which rests before 1 of the furnace burners & burns continuously. Hot water heating units, gas fireplaces, along with old gas stoves too usually have comparable standing pilot lights. If your furnace features some round knob on the gasoline valve with all the text OFF/ON/PILOT, you’ve a standing pilot ignition. This’s a somewhat easy technology, although not really fuel efficient. A small heat sensing device known a thermocouple ensures that big gas flow is delivered to the primary burners on the furnace just when it’s kept hot by the presence on the pilot light. Occasionally an upright pilot light is going to need to be relighted, or maybe a thermocouple will have to be replaced, but these’re infrequent and easy repairs.
Intermittent Pilot Ignition
If you’ve a more recent furnace (or one with an AFUE score above eighty), it more than likely has an electronic ignition program. One kind of electronic ignition is definitely intermittent pilot. This product works with a pilot flame, though the pilot lights just when there is a call for heating out of the thermostat. The furnace’s electrical balance board triggers an electric powered igniter which utilizes a high voltage spark to light the pilot. The pilot, for turn, lights the gasoline for the burners. When the burn cycle is done, both the pilot and the burners turn off. You are able to find an intermittent pilot by its heavy gauge wire resulting in an unit with a metal tip which is placed alongside the conclusion of a little gasoline line, and that materials the pilot flame.
Hot Surface Ignition
Most of present day furnaces with electric ignition have a warm surface igniter or maybe HSI. This’s a component that comprise of a ceramic fork or maybe tongue connected to some squarish plastic base with 2 cables. The igniter sits in line with one of the fuel burners. When there is a call for heating out of the thermostat, the fork heats in place until it’s red hot. The fuel valve then opens, so the gasoline is ignited through the radiant igniter. Hot surface igniters burn away as time passes, though they’re not hard to change. You are able to typically check to find out if a warm surface igniter is working merely by going through the louvers on the front cover when there’s a call for heating. Igniters glow brightly, therefore in case you do not experience some light, food is wrong. On another hand, when the igniter never stops healthy, there is a difficulty with the furnace’s electrical management board.
Why Pilot Lights Were Discontinued
The primary trouble with standing pilots is they waste gasoline, towards the tune of aproximatelly four to five therms each month. (A therm would be the device of measure found on many individuals all-natural gasoline bills.) At the national typical of about $1/therm, that actually works out to four dolars to five dolars each month or even $480 to $600 within a 10 year period, simply to run the upright pilot light. The other difficulty with standing pilots is the tendency of theirs to go out, generally when it is windy or when the orifice on the pilot resources line is obstructed. Electronic ignition methods, on another hand, might go a long time with no need for attention.