I have a new to me used Harman p68 2009 model. Excellent shape and I just installed. I fired it up tonight and I assumed it would have a gentle fireplace like flame but it seems like it's burning like a blow torch is this normal? I know you can adjust the feed rate and distribution blower speed by the different settings but I haven't read anywhere that you can adjust the combustion blower without messing with the circuit board. It just appears to me like it's getting too much combustion air but I'm not a professional. Maybe this is just normal and I'm not used to a Harman.