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Wiring a Thermostat to a Fan.

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  • 10-12-2008 10:38pm
    #1
    311
    Closed Accounts Posts: 5,332 ✭✭✭


    Howdy all , just in the process of trying something out at the moment.
    Can I connect a Fan/Vent to a thermostat ,so that it activates when the temperature reaches a high one.
    I often wire thermostats ,but not sure if the link will work the opposite way.


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    #2
    Pete67
    Registered Users Posts: 1,257 ✭✭✭Pete67


    No problem, just make sure the thermostat has a single pole changeover switch - it should have three terminals - Normally Closed (NC), Common and Normally Open (NO). The NO and common terminals will make when the temperature rises to the setpoint and switch on the fan. Also check that the thermostat has a current rating to suit the fan motor. Unlikely to be a problem in a domestic setting but some industrial fans have large motors and a properly designed motor control center (MCC) would be required.


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    #3
    311
    Closed Accounts Posts: 5,332 ✭✭✭311


    Good man ,thanks for that :)


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    #4
    enmac
    Registered Users Posts: 98 ✭✭enmac


    Pete67 wrote: »
    Also check that the thermostat has a current rating to suit the fan motor

    you need to be careful here - its not just the running current you should be concerned with - the contacts in the thermostat may not be rated to open a highly inductive load


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    #5
    311
    Closed Accounts Posts: 5,332 ✭✭✭311


    I'll check the thermostat I have , haven't bought the fan yet but I only need to get a small one.
    It will probably be a standard 13amp.


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