Replace Honeywell T8635L thermostat

Old 01-27-23, 06:15 PM
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Question Replace Honeywell T8635L thermostat

I have a Honeywell Envirazone W8835 multi-zone unit with 3 Chronotherm IV plus (T8635L) thermostats. I would like to replace the thermostats with newer ones that are wifi ready. The thermostats are connected by 3 wires (terminals are labeled 1 & 2 & 3) to the Envirazone W8835. Which newer thermostats are compatible?

Old 01-27-23, 11:49 PM
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It looks like you would also need to replace the zone control board.


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