RE: Re: Automating a combi boiler

["Neil Ball" <neilball@xxxxxxx>]

Take a look at the boiler wiring info - there should be terminals for a
"Central Heating timeclock" or similar which may have a link in
at present.
It will require a 240v relay to switch this, but this will enable you to
remote switch the central heating without disturbing the hot water ie the
boiler remains permanently supplied. All you then need to take care of is
the thermostatic room control which I assume you're doing through HV or
similar.

-----Original Message-----
From: Brian G. Reynolds [mailto:brian.g.reynolds@xxxxxxx]
Sent: Saturday, January 17, 2004 02:25
To: ukha_d@yahoogroups.com
Subject: RE: [ukha_d] Re: Automating a combi boiler


Thanks Patrick for the info,

You say "Not sure what else you were expecting" to my comment
below...well I
was expecting to see "connect HV here"!!!

Haven't these boiler makers heard of HV yet? shame on them...

Cheers mate, I will look into this when I get up later...

B.


-----Original Message-----
From: Patrick Lidstone [mailto:patrick@xxxxxxx]
Sent: 16 January 2004 13:25
To: ukha_d@yahoogroups.com
Subject: [ukha_d] Re: Automating a combi boiler


--- 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.





[Non-text portions of this message have been removed]


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