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    Ericstein9 Posts: 1, Reputation: 1
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    Nov 1, 2010, 11:31 PM
    Wiring diagram for ITT T99BV303J
    I am trying to replace an old ITT thermostat model T99BV303J with a new programmable thermostat. The new Honeywell model RTH2300 says I need to identify the terminals (Y, W, R, G, etc) in the old thermostat as a first step. Nowhere on the old thermostat does it say what either of the two wires (one red, one white) is associated with. Is there a way to determine how the two wires correspond to the terminals in the new honeywell thermostat?

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