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    J_Egert's Avatar
    J_Egert Posts: 1, Reputation: 1
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    #1

    Dec 27, 2006, 10:40 AM
    Converting 240V thermostat to programmable
    Recently purchased a low-voltage programmable thermostat for the girlfriend to replace her ancient Cadet model but found it was unusable as she has a 240V (Single black, single red + ground wire) in-wall electric heater. Are there programmable thermostats for this type of system or do they only make them for low-voltage? If so, which ones would you recommend? I seem to have found a few online (such as the HONEYWELL TL8230A-1003 PROGRAMMABLE BASEBOARD THERMOSTAT) but they inevitably have 4 wires and I'm not sure they would be compatible with my three wire system.

    Thanks.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #2

    Dec 28, 2006, 08:32 AM
    For an excellent discussion on wiring such thermostats, see https://www.askmehelpdesk.com/electr...ers-50274.html More material at https://www.askmehelpdesk.com/heatin...ems-50240.html Disregard the first post and discussion of it. There is no way to keep people from posting bad answers.

    You could also use the low voltage thermostat to control a relay like the ones on an A/C.
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