Re: Heating relays and CAT5 power

["Simon McCaughey" <simonmcc@xxxxxxxxxx>]

Nigel,

That is excellent to hear! Your tidy solution certainly gives me something
to aim for!

I suspected my ratings were ok, good to have that confirmed too.

What size of diode should be used?

S.


On 27/10/06, Nigel Giddings <nigel@xxxxxxx> wrote:
>
> Simon,
>
> I have built a VIOM based CH controller and used the matching relay
> boards which are rated at 1 amp d.c. at 24 Volts d.c. /110 Volts a.c.
>
> http://photos.corbenic.co.uk/dcp02093jpg.html
>
> I suppose it really depends what you will actually be switching, that
is
> to say what is it connected to in your heating system. My system
> controls wax filled zone valves, these then operate a switch to
operate
> the pump...
>
> A 3A relay should have no problems at all, you will probably find that
> your spur unit feeding mains power to the existing controls is only a
3A
> anyway...
>
> Running your proposed relays over CAT5 should be no problem but make
> sure you fit diodes across the coils to prevent back EMF caused when
the
> relays magnetic field collapses when de-energised...
>
> HTH
>
> Nigel


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