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Old 11-25-2022, 08:38 AM
 
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Quote:
Originally Posted by Listener2307 View Post
Got it. Thanks, all
I never found a text that told me there was a switch inside the main gas valve. That's the part I was missing. Obviously, that switch, activated by the tiny voltage generated by the thermocouple, is another thing that could fail.
I don't know that they ever DO, but they could.
When I was in the field I replaced so many failed thermocouples
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Old 11-25-2022, 09:10 PM
 
Location: Johns Creek, GA
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Quote:
Originally Posted by Listener2307 View Post
I never found a text that told me there was a switch inside the main gas valve.

You didn’t ask that!
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Old 11-26-2022, 03:01 AM
 
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One has to be careful with terms …

While they do the same function there is a difference between a flame sensor and the old school thermocouple called a flame rod .

Newer burners with electronic ignition use a flame sensor …older burners with pilot lights use a flame rod …

We tend to call the flame rods thermocouples.

Electronic burners may not actually be using thermocouples
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Old 11-26-2022, 08:42 PM
 
Location: Not far from Fairbanks, AK
19,648 posts, read 34,672,794 times
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Quote:
Originally Posted by mathjak107 View Post
One has to be careful with terms …

While they do the same function there is a difference between a flame sensor and the old school thermocouple called a flame rod .

Newer burners with electronic ignition use a flame sensor …older burners with pilot lights use a flame rod …

We tend to call the flame rods thermocouples.

Electronic burners may not actually be using thermocouples
Good points. Then there are thermo-switches of various forms, including the ones used in electrical water heating-carafes used at home to boil water. These use snap switches that make a snapping sound once the water has reached a boiling temperature. Some of the older aircraft window heaters used snap switches that would cut power when the windows reached a set temperature, and then closed the circuit again if the temperature dropped to a preset point, but these switches din't make a snapping sound like the ones at home. NESA windows used snap switches like that, but I don't know if newer NESA windows use snap switches. More than likely newer aircraft windows use electrical "bridges" that react to temperature variables in the glass to energize/de-energize the heating circuit of each window.

Last edited by RayinAK; 11-26-2022 at 08:54 PM..
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