First, a propane tank. And no, the furnace was not originally converted for propane use. I got a call because "the manual reset switch keeps tripping".
This wire has been heated a lot.
Where is our combustion air?
Why is there so much soot?
These are natural gas/sea level orifices. Should have been 56's per manufacturer specs.
What is the static pressure of the BURNER COMPARTMENT?
This is because there is a 5-ton blower and a 16x20" Return filter.
Also, because the return is not sealed off from the combustion area.
The rollout switch trips almost immediately.
And there has obviously been a history of heat where there should not be.