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replacing a thermostat

Posted by eric on October 19th, 2002 07:23 PM

i just bought a fancy new electronic thermostat to replace my existing round one (gas fired hot air) after removing the casework and i can only see 2 wire connections (1 black/ 1white).. and neither have a letter etched near them..
any thoughts on which wire does what and if the 3rd wire that the instructions seem to imply might be a ground wire that just isnt on this old thermostat??

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