Posted by 2510Paul on February 01, 2019 at 19:00:26 from (72.160.248.225):
Recall I posted about my furnace outage. I chalked it up to restricted in flow pipe. Since then I have had the flame rollout switch trip three more times.
I have been searching for causes of flame rollout in a Natural Gas, Trane XV95, residential furnace. I am hoping Bob or others more knowledgeable or experienced can help build my knowledge.
1. Cracked Heat Exchanger. Everyone on YouTube talks about this. I get it and will check further.
2. Low gas pressure. I have to review my schematics for a low gas pressure switch but the point is the High Temp Rollout Switch is what is tripping. I have my house, my 24x28' garage, and my 32x72' shed all piped to one gas meter and as you know it was -28F. If all three called for gas at once could that trip the flame rollout switch? I cannot visualize what happens. Does the flame wander and hit the flame rollout switch.
3. A lack of combustion air. I think I get it. The flame will follow the oxygen and go upstream to get it if necessary. Correct?
4. Plugged Burner Orfice. ?????
5. Plugged heat exchanger. This is another one the YouTubers like to mention. I guess if the exhaust air is not moving fast enough the flame will seek more oxygen towards the source of the outside air. Correct?
I did get from YouTube what a good healthy flame should look like.
So Bob or anyone else, can you comment further on any of these. Sorry this is off topic, but I do heat my tractors with natural gas. :-)
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