Yep, your 30 is missing a diverter plate thst needs to cover the upper heat-exchanger tube bundles. Seeing some bigger particles, still burning going directly past the tubes, into the exhsust circuit. That it self could be sending 'avaible outgassing particles' into the exhsust. Get enough over time, and when the unit get heat soaked after enough time, and with a long lenght of exit run, it could be much if the cause.
Thanks Mike, very helpful. Could you describe what happens when you get a backfire/explosion? Does something catch fire? where did you get the operating manual?
You can't miss it !! Very loud. Nothing caught fire, but I called the fire dept to inspect the house. Here's the manual download. www.butkus.org/whitfield_operate/whitfield_operate.htm
Looks great. Glad it went well.
Me too !!
Yep, your 30 is missing a diverter plate thst needs to cover the upper heat-exchanger tube bundles. Seeing some bigger particles, still burning going directly past the tubes, into the exhsust circuit. That it self could be sending 'avaible outgassing particles' into the exhsust. Get enough over time, and when the unit get heat soaked after enough time, and with a long lenght of exit run, it could be much if the cause.
Thanks Mike, very helpful. Could you describe what happens when you get a backfire/explosion? Does something catch fire? where did you get the operating manual?
You can't miss it !! Very loud. Nothing caught fire, but I called the fire dept to inspect the house. Here's the manual download. www.butkus.org/whitfield_operate/whitfield_operate.htm