rheem imperial 90 plus banging sound


Old 12-17-12, 03:48 PM
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rheem imperial 90 plus banging sound

[SIZE=3][/SIZE][SIZE=3]We have a Rheem imperial 90 plus natural gas forced airfurnace. There is an intermittent bangingsound shortly after the blower starts. It is not at the time the blower starts but after it is on – from a fewseconds to a longer period before the “bang” sound happens. I have not been able to be in the utilityroom at the time when it actually does the sound. There appears to be no pattern as to whenthis happens. I know I am not giving alot of information, however we do not have a lot of knowledge on this equipmentand the problem is not consistent. The furnacewarms the home to the desired temperature. The sound it makes is best described as someone hitting the duct work.[/SIZE]
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Old 12-17-12, 06:33 PM
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It would appear that the squirrel cage blower wheel is hitting something. Possibly a loose bracket hitting or the blower wheel has shifted on it's shaft.

You may have to open the blower housing and make a manual inspection of the blower assembly.

As always......make sure power is turned off before putting your hands into the blower.
Old 12-17-12, 07:45 PM
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Probably "oil canning," caused by the duct work being inflated by the air pressure of the fan.

You might be able to find a way to reinforce the metal duct work by fastening an additional piece of sheet metal with sheet metal screws --- but you are going to need to do some investigating to isolate where the problem is happening.
Old 12-18-12, 06:25 AM
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Thank you for your help, It appears it may be a combination of both.

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