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HONEYWELL ST6400C / ST6450B Programmer wiring changes

Postby marek » Thu Jul 02, 2009 5:31 pm

Can anyone out there tell me if the ST6400C is interchangable with an ST6450B programmer or do you have to change any of the wires. They look pretty identical. I wanted to check before replacing my faulty ST6400C with a ST6450B
Many thanks in advance
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