8 Reasons Hot Surface Igniters Fail



The Hot Surface Igniter has ended up being a market standard in gas heating systems in the Sacramento Valley. To specialists as well as heater producers all over, the sequence of occasions that takes place for a gas heater to start a fire that jets right into televisions of the heat exchanger is like a well-choreographed dancing. Stay while we talk about an important part of the sequence to bring heat right into a home: the warm surface igniter.
Introductory

As the winter season methods, we are mosting likely to be utilizing our gas heating systems more and more. A lot of those furnaces won’t be illuminating when they’re turned on for the first time this period. The hot surface area igniters that start the flame in a gas furnace usually stop working. It’s nearly as common as replacing a capacitor in air conditioning systems around the city every spring.
Exactly how They Function

Hot surface area igniters are a resistance component constructed from silicon carbide or silicon nitride. Anywhere from 80 to 240 volts are put on the cords connected to the igniter. A ceramic base shields the cable link to the carbide component which resembles the letter M on a lot of applications. Spirals are one more shape I see. Many nitride igniters are created in the shape of a 1.5-inch flat stick or a 2-inch long cyndrical tube.

When the voltage is applied to the cords, the component starts to radiance as a result of the resistance the carbide creates from one wire to the next. When it shines long enough, gas is poured over it, and also the fire sparks.
Warm Surface Area Igniters are Resistance Heating Units

As mentioned previously, hot surface area ignitors, or HSI’s, are resistance heating systems. The aspect itself glows orange when the voltage is applied. Exactly how warm that element obtains relies on the voltage being put on it. A 120-volt HSI will certainly radiance at around 2500 levels Fahrenheit. A lot of gas fuels will certainly spark around 1100 levels, so 2500 degrees is a little excessive. A 240-volt igniter burns even hotter. Numerous control panel these days are made to sustain an 80-volt igniter. In this manner the carbide breaks down slower, adding life to the system.
Hot Surface Igniters are Better Than a Pilot Light

Prior to hot surface ignitors as well as spark ignition was about, we had gas pilot lights that would stay lit shedding a 1 to 2-inch fire year-round whether the heat was on or not. When the warmth was activated, the gas valve would certainly flow much more gas over the pilot to spark the burner setting up that lugged the flame.

For a pilot to remain lit all year, it might set you back approximately $150 bucks a year relying on where you are in the US. A few of you reading this message have pilot burner still going solid on your 35-year-old heaters! Although very trustworthy when needed, as well as not an absolutely major expenditure, it’s not a wonderful use sources to just let that gas flame just shed all year.
On-Demand Efficiency

You might be alright with a tiny pilot burning in your heater all year, yet it actually flip out a few of our customers. A lot of people don’t also know that brand-new heaters these days do not have pilots any longer. They come with on-demand ignition components like an HSI. Indicating the ignitor only comes on when needed as well as even after that, it only begins for less than a minute at a time.
Warm Surface Area Igniters are Silicon Carbide

Silicon Carbide is one of the most usual elements that comprise a hot surface area igniter. Not only are these igniters used to light gas heaters, yet they are utilized for lighting cooktops, boilers and various other home appliances that heat up points around your house. Carbide is made use of as an unpleasant, as a reducing device, and has some vehicle applications as well. The first carbide igniters were in fact produced in 1969. From then until now they have actually turned into one the major selections for manufacturers to utilize as their ignition source. The various other resource being stimulate igniters, which we’ll speak about on another post.
How Long Do Hot Surface Igniters Last?

Much like many elements on your HEATING AND COOLING system, these parts last concerning five to ten years. Yes, you can obtain fortunate and also have one last for twenty years, however it’s few and far between. Different hot surface area igniters last longer than others. The trend over the last 5 to ten years has actually been to make use of the more long lasting silicon nitride igniters. They appear to be much less weak, making them far better able to stand the test of time.
Why are Hot Surface Area Igniters Such a Common Replacement Thing Each Year?

So why do these silicon carbide igniters break so commonly? The fact is, a gas fire pours over these ignitors which applies a lot of damaging warm to them. The same point that makes them job additionally ruins them!
8 Reasons Hot Surface Igniters Break Down Too Soon:

  1. Brittle HSI’s.

Simply today as I was called by among my techs who claimed they inadvertently broke an HSI as they were cleaning up the burner assembly on a regular upkeep call. It occurs. If you took your forefinger and thumb and also brought them with each other even somewhat quickly, that would be enough force to damage the carbide suggestion of a warm surface area igniter to pieces.

  1. Overuse.

A heater that cycles on and off exceedingly will decrease the life-span of an HSI. Seeing to it the system is correctly sized for the house is possibly a good concept. We claim all of it the time, yet a poorly sized unit is mosting likely to create all sort of problems. Possibly not in the initial year of its life, but long after the professional that installed it is gone, as well as not responding to the client’s phone calls any longer.

  1. High Voltage.

If an HSI is revealed to greater voltages than it’s supposed to receive, they will certainly break sooner than they should. An 80-volt HSI should have about 80 volts put on it. Applying 120 volts to that HSI will certainly create it damage, as well as occasionally virtually promptly. Having as well reduced of voltage may not allow the igniter burn warm enough.

Once, in my very early service years, I changed a 240 ignitor for a bundle device with a 120 ignitor. Not just did the HSI break on the very first startup, yet the high voltage backfired to the control board and also took it out also, which put my company in the placement of needing to currently replace the client’s control panel. I never did that once more

  1. Contamination.

Some area specialists state that the oils on the hands of specialists will create the carbide tip to break down earlier than it should. Various other specialists claim it will not. One thing is for sure, the fewer pollutants that touch the surface of this red-hot igniter, the far better. Other pollutants around your home that can jump on the warm surface area igniter are sheetrock dirt, condensation, dust, corrosion, and fiberglass.

  1. Gas shutoff stress.

An overfired gas valve will cause the fire to be hotter than it needs to be. Any sort of warm is going to break down the HSI normally. It’s components can last much longer if you make certain the system is established correctly.

  1. Faulty control board.

In most cases the ignitor on the heating system is associated the flame that fires into the warm exchanger. It starts radiant red-hot when the control board informs it ahead on. If the board does not tell the HSI to switch off, it will certainly remain to glow red hot. You ‘d likely have a faulty board in this situation, and that won’t be good for your HSI either.

That hot surface area igniter will certainly be stimulated in about a minute. Many igniters attain optimum temperature level in less than 15 secs. Some ignition series can leave the igniter burning for regarding a min. The less the igniter needs to get on, the longer the life expectancy of the igniter. Some points can’t be altered on a furnace such as this made ignition series, so sometimes we’re simply stuck with what we’re offered.

  1. Lp gas.

Gas is an extremely thick gas. If you were to contrast a gas furnace to a lp gas furnace after just five years of use, you would see the burner assembly on the gas system resembles it requires to be cleaned up more than the gas heaters. I have actually seen warm surface ignitors that stand in the stream of a propane fire have the top fifty percent of the carbide idea ripped off after simply 3 to 5 years.

  1. Induction heat.

A heat exchanger that is overheated at closure can emit extra heat on the ignitor to damage it or its ceramic base, especially in closed combustion systems like those Coleman or Intertherm downflow heaters you discover in modular and mobile homes. A fan cools the heat exchanger once the call for heat has been satisfied. Ensuring the follower remains on for more than 90 seconds may be a method to correct this.

Standing pilot lights are a distant memory. Heating systems these days have spark igniters or warm surface igniters. I do not understand that a person is really much better than the other. Warm surface igniters are replaced concerning every five years. Stimulate igniters have their failures too, though, which is why the sector hasn’t devoted itself to one technology or the various other.

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