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Old 04-02-2013, 04:31 PM
 
Location: Queen Creek, AZ
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Currently, in our 2011 built home here in Arizona, we have two Carrier 80% AFUE electronic ignition gas furnaces (zoned system). In our previous 1990 built home in New Mexico, we had a Tempstar standing pilot gas furnace.

However, the home we lived in before that from 1994-2001 in Virginia was built in 1994. I would like to know, around what year did electronic ignition become the norm for gas furnaces? Specifically, would the furnace in the 1994 built Virginia home we lived in been a standing pilot or an electronic ignition model? I remember it being a Janitrol model and was located in the attic.

Also, I don't know if this would give a clue or not, but that house had a red gas burner switch in the upstairs hallway, which I remember my younger brother (who was three years old at the time) inadvertently turned it off once.
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Old 04-02-2013, 06:35 PM
 
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The burner switch was for the solenoid for burner and probably the blower too.

You can still get "standing pilot" furnaces "new" today, they are not popular but they are simple.

There have been "hot wire ignition" furnances available since the 70s, they probably over took sales of pilot models in the 90s...
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Old 04-02-2013, 07:23 PM
 
Location: Queen Creek, AZ
6,477 posts, read 10,156,023 times
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Quote:
Originally Posted by chet everett View Post

You can still get "standing pilot" furnaces "new" today, they are not popular but they are simple.
Really? The current minimum federal standard set by the U.S Department of Energy is 78% AFUE (with most typical standard units being 80% AFUE). Older standing pilot furnaces typically had an AFUE of 55% to 65%, and I don't think it is possible to achieve at least 78% AFUE with a standing pilot.
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Old 04-02-2013, 08:10 PM
 
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most of your furnaces today have a blower [inducer motor] to push out your exhaust that s where you make most of your afue,i was told years ago in heating school it took 20% to make a natural draft,and some heater s do have a pilot with an inducer for 80% afue . as a rule if you have a metal smoke pipe you will have less afue,if you have plastic piping that will be the highest afue as a rule.
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Old 04-03-2013, 01:34 PM
 
Location: Johns Creek, GA
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" For curiosity - around what year did electronic ignition gas furnaces become norm?"

My HVAC contractor starting pressing me to use them as standard equipment right around '90. And as far as I can recall, other HVAC contractors were going to them about the same time- by '95-'96 I think it was pretty standard for all builders from starter homes to customs.
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Old 04-03-2013, 06:09 PM
 
359 posts, read 1,007,573 times
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spark ignitors started around 1980.....then came hot surface, spark goes tick tick, hot surface glows orange.
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