Re: Automating a combi boiler

["Patrick Lidstone" <patrick@xxxxxxx>]

--- In ukha_d@yahoogroups.com, "Brian G. Reynolds"
<brian.g.reynolds@n...> wrote:
> Hi all,
>
> I have recently installed a new "Protherm 100EC" combi and
am well
pleased with it as I now have a shower!!!.
>
> Question is, can I connect an HV controlled relay to the thermostat
wires to automate it instead of a thermostat?
>
> Somehow I doubt it would be this easy but one lives in hope!

Yes, it is this easy. You may want to consider installing a real
thermostat as a backup, and then setting the set-point to a very low
temperature when using your automated control. Your automated control
and the thermostat should be wired to the boiler in parallel. You
should also ensure that your relay is wired such that the contacts
are left open under controller power-fail conditions, otherwise you
could end up cooking if something goes horribly wrong with your HV
controller!

The switching voltage for the thermostat depends on the boiler. You
may well need to use a mains rated relay/cable.

> I assume a thermostat is just a bi-metallic switch of some sort?

This is correct.

> The manual shows a link that must be removed if a thermostat is
fitted but that is all I can see.

Not sure what else you were expecting.

Patrick


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