Heat Pumps and Electric Heating - Thermostat Installation Wiring O and B

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benlkmary
07-28-07, 02:06 PM
I have a Honeywell Visionpro 8321 Thermostat and am trying to use it to replace a PROTECH PRO-520. The installer of the PROTECH, several years ago, said the replacement should have O and B but the VisionPro has O/B. Is the Honeywell VisionPro unit compatable or do I have to find a different unit?

Thanks