rheem furnace blower speed?


I have a rheem classic super quiet 80 furnace that according to manufacturer's literature, has adjustable air speed that a technician can adjust. Does anyone know how I can adjust it myself?
http://www.rheemac.com/products/ProductInfo.aspx?XSL_File=rheemac_product_profile.xsl&Market=Residential&SectionVar=Heating&Category=Gas Furnaces&SpecificModel=RGLN
Also, if the blower speed is lowered, wouldn't the furnace run hotter and risk overheating? I hope there is a way to dial down the burners.
I'm not using some rooms and are closing the registers in those rooms to save energy. This cause the other register to blow stronger, too strong in fact.
For future reference (when I need to buy a new furnace), does any furnace maker support home owners directly? I hate to ask the installer for support since they are not necessarily the most knowledgeable.
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It will run hotter and shorten exchanger life if its higher than spec, you need to know and measure temp and not exceed it before starting. Closing registers can have the same effect. Fan speed may not slow much anyway. Start by figuring out what its temp above the exchanger is now and what the manual says is correct.
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http://www.rheemac.com/products/ProductInfo.aspx?XSL_File=rheemac_product_profile.xsl&Market=Residential&SectionVar=Heating&Category=Gas

Contact Rheem, and get a copy of the "installation manual". It should have this info. Some companies make it easier than others to get this manual, but if you are persistant, you should be able to get it.
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The "High-limit" switch will turn the furnace off when/if it gets too hot. Some limit switches are adjustable if you want to lower the cut-off temperature.

http://www.rheemac.com/products/ProductInfo.aspx?XSL_File=rheemac_product_profile.xsl&Market=Residential&SectionVar=Heating&Category=Gas

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James, If you lower the blower speed, it will likely cause damage to the furnace or componets. The temperature rise through the furnace MUST stay within the range printed on the information label on the furnace. Closing registers will only cause problems and you wont say a single dime by doing this. Your furnace was hopefully, properly sized for your house. It was NOT sized to do only one or two rooms. If you want to do that, turn the furnace off and plug in a space heater. In general, furnace manufacturers dont directly support homeowner self installs. They are recommended to be put in by licensed hvac professionals. Some online websites will support the customer directly but most manufacturers state that they will NOT warrant online purchases of furnaces. ransley will tell you different but then he is a complete idiot. Bubba
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