this...and steel wool...8)
this...and steel wool...8)
The only thing the thermocouple does is keep the pilot valve lit, as long as it senses the heat from the flame it allows gas flow, so yes on older systems the flame sensor is, in essence, the thermocouple.
Flame sensors for newer systems use a flame rod...resistive to heat...it goes to a microcontroller that runs the blower, gas valves, safeties etc..
Flame sensors for newer systems use a flame rod...resistive to heat...it goes to a microcontroller that runs the blower, gas valves, safeties etc..
Regarding older systems, a thermocouple is a standing pilot sensor. It could care less if there is a flame in the main burner. Two completely different things thats only similarity is that they perform a safety function.
Sounds like a lot of people here that think they know what they are talking about and only a select few that know what they are doing and /or have actually worked in the trade.
OP, take my last advice as you please ....... Hire a professional
We also have an old furnace, it's been doing that for years. I have guessed it's a heat sensor because it usually does it a little while after the furnace has ran. I'm thinking the sensor heats up a little bit more after the blower shuts off then turns the blower back on because it thinks the burner is running. Haven't really worried about it, I'll figure out how to fix it when the sensor gives up completely.
and a flame sensor wont turn the furnace on for a minute . sounds like some people don't know what they're talking about alright
Sounds like you may have the old dial fan/limit. A lot of the times you can adjust them and they will work fine.The are getting a litlle pricey due to old technology and not being used anymore.
You in okc?
You in okc?
If it's just the blower bumping back on PM me and I'll tell you how to adjust it.
A flame sensor with carbon on it sure can. The RHEEM and York units are notorious for that very symptom. Its the first thing I look at on a no heat service call for a 90's model RHEEM
There is no reason to pounce on my post. Your one of the few here I thought / think actually knows what they are talking about. That being said, I ( like you ) think the unit in question is much older then that tech. prolly so old that it has one heck of a crack in the exchanger and is pouring CO in the home. Who knows. The OP didnt provide much info and for all I know he knows just enough to get himself into a heap of trouble. Wasn't it just last month an entire family in Catoosa almost died from CO poisoning?
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