Question OIL-FILLED HEATER 2000W Nest Thermostat

Discussion in 'Domestic White Goods Forum' started by scholar2k3, Mar 3, 2018.

  1. scholar2k3

    scholar2k3
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    Hi

    I have bought the following

    OIL-FILLED CONVECTOR HEATER 2000W

    Acova TAG-200-116-S Wall-Mounted Oil-Filled Convector Heater 2000W | Electric Radiators | Screwfix.com



    I want to control it via Nest 3rd Generation Thermostate.

    Nest Smart Thermostat & Hot Water Control | Smart Heating Controls | Screwfix.com



    But when I looked at the Nest relay amps it only supports <3 amps but the heater might require 8amps (calculations on the basis of Amps=2000W/230V )



    Is there a way to control the above heater through NEST by adding the extra relay on the heater side?



    Many thanks for the help.
     
  2. Gavtech

    Gavtech
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    Welcome to the forum.

    In regards to using an additional relay...there is no reason why not.

    Did you have a relay in mind for the purpose? Safe wiring would be the main concern.
     
  3. scholar2k3

    scholar2k3
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    Hi Gavtech,
    I need advice about the relay, I have no idea what and how.
    Please guide me.
    The question is Nest will switch on/off a relay/any device which should not exceed 3 amps but that relay/device should be able to switch on/off the heater which takes 8 amps.

    Regards
     
  4. Gavtech

    Gavtech
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    You would need a mains relay ( i.e. the coil should be rated for mains AC, and the contacts rated for the load. A typical relay rating would be 10 Amps. Single pole contacts or single pole changeover are adequate. Double pole would be OK. Whichever, it needs to be a non-latching type.

    There may well be relays which are dedicated to switching heating applications but I have not researched it.
    Such things would be better suited no doubt because they would come with enclosures and / or pre-wired.

    It would be easy enough to obtain a suitable naked relay - but the problem for this application would be connecting to it safely and in a suitable wiring enclosure.

    I suggest contacting a heating specialist to see if they can recommend a dedicated relay for the purpose.

    In terms of wiring - You would need to take a Live and Neutral into the Nest to connect to the conventional live and neutral terminals.
    You would also need to link Live to terminal 2 of the Nest.

    Terminal 3 of the Nest is the switched output 'Live' which you would connect to one side of the coil of the relay. The other side of the relay coil would be connected to Neutral.

    Assuming that the relay's minimum contact complement is single pole / single throw, you would have a common contact, and a normally open (NO) contact and a normally closed contact (NC)

    As this is the load circuitry you would have to connect a suitably rated meaty Live to the common contact. A similarly rated cable would connect to the normally open contact and would be the live feed for the convector fire.
    The fire would also require a suitably rated neutral and earth of course.
     
    Last edited: Mar 4, 2018
  5. Gavtech

    Gavtech
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    Here is a circuit of what is described above. Nest with additional relay.jpg
     

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