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2 Stage T-Stat w/ Fan control???
Check out the replacement for the T7300 which is the TB8221. You can look at the specs at http://customer.honeywell.com. Scroll down to the very bottom right corner and put TB8220 in the little box and click onthe arrow beside it. Then click on the pdf that comes up. You can save some money by using the residential version of the same thing TH8320, but I'm not certain if you can use economizer as first stage.
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