Re: Relay to switch HVAC Unit

[Jamie]

HS wrote:
> I want to be able to switch an HVAC unit on/off. The unit is 220V AC. With
> the compressor on the unit draws about 8 amps.
>
> Because of the high voltage/current I want to make sure that this is
> completely safe.
>
> 1. Is this project a bad idea in general, or is switching through the relay
> a safe way to turn AC/heat on and off  (rest of circuit will be optically
> isolated)
>
> 2. Assuming that I don't toggle power too often, is this switching method
> 'bad' for the AC unit (eg. for the AC give it several minutes before turning
> it on again, if it has just been turned off)
>
> 3. If I use a relay rated at 220V 10A will that be sufficient?
>
> 4. Can anyone recommend a relay with above specs (coil DC 6V, 9V or 12V),
> with not too loud a click?
>
> Thanks
http://www.gavazzionline.com/pdf/RJdatasheetmidi.pdf

 look at that one.
 you would want the zero crossing type and try to get the
2 pole option with 50 amps and select the input control
voltage you want to use.! Dc or AC etc..


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