Thermopride Oil Furnace - Loosing sleep

[alotawatts]

I had a new Thermopride Oil furnace installed last spring. So far....so good. My problem is our bedroom heat register/vent is directly above the unit in the basement. When the system burner and fan cut out and it starts to cool down it's generating 'clunks' somewhere inside the unit from the sheet metal contracting. Colder air in the chimney/exhaust this time of year I suppose.
Standing next to the furnace (basement) the noise is minimal but it's amplified going up through the plenum and duct to the bedroom.
I know just enough to be dangerous but I'm hardly qualified to pull the burner etc. and try to find and insulate the noise source.
Any thoughts ?
Thanks

[karsthuntr]

HX is cooling down and clicking, same thing your car does after you shut it off. Sheetmetal ductwork is a great transmitter of sound. You can call your contractor back and get them to line the inside of your duct work, this will limit the sound.

[alotawatts]

Thanks. I know the new plenums are rubber lined. The length of the duct from the plenum to the register is very short...maybe two feet. I'm not too optimistic lining it will help.

[beenthere]

Is the new furnace the same size as the old one.
Sounds like it may not be moving enough air.

[bob hubbard]

Sounds like you need to bring the fan on sooner and get it to run longer after shut down of the burner . I would hav the installer out and hav him listen and try setin the fan limit control . Also some t-stats can bring the fan on when the burner comes on . This would let the hx warm slowly . Try running th fan in the ( on ) position for a few night ad see if that stops the noise . Also check filters to be clean befor testing .

[docholiday]

Either that or reroute the one supply run thats giving you fits so it's a little longer... IE a few turns and back.