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Thread: Upgrade from Honeywell Chronotherm 3 to wifi - please help!

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    Which smart thermostat works with this wiring? Please help!

    Hi all,
    I am new to this forum, would really appreciate some help upgrading my 20-year old Chronotherm 3 thermostats to smart wifi based ones.
    Background:
    We have two York HVAC units servicing four zones. Two zones upstairs and two zones downstairs - each zone controlled via a Honeywell Chronotherm III thermostat. For each HVAC unit we have an Aprilaire 6202 Single Stage 2 Zone Control Panel. Each HVAC unit has dampers (I am not sure which make) to regulate air flow for the two zones. This is a master-slave setup where one thermostat on each floor regulates HEAT/COOL/OFF as well as the temperature for a zone and the slave thermostat just sets the temperature for a zone.
    I have attached photos of the thermostats and control panels if that helps.
    I tried switching to Nest but their technicians said it wasn't compatible. Is there another make of wifi smart thermostat that you think would be compatible?




    Thanks so much in advance

    Michael

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    Last edited by mikeapenn; 11-17-2018 at 04:37 AM.

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