Re: Boiler control update and query

["Paul Robinson" <ukcueman@xxxxxxx>]

This is more interesting and complicated than I'd have thought it would be.
I'll have to add this to
the list of things to do :-(


----- Original Message -----
From: "Dave McLaughlin" <dave@xxxxxxx>
To: "Ukha" <ukha_d@xxxxxxx>
Sent: Tuesday, December 16, 2003 11:36 PM
Subject: [ukha_d] Boiler control update and query


> Hi All,
>
> My new AVR Microcontroller based boiler control is now operational and
has
> been for about 3 weeks now. It works a treat and is high tech enough
for me
> as a gadget freak!!! :o)
>
> One thing puzzles me though and that is the temperature cycling of the
> boiler. This link will take you to the website with a page showing the
> boiler chart.
>
> http://www.embeddedcomputer.co.uk/Projects/Controller/BoilerCharts/boilercha
> rts.html
>
> http://tinyurl.com/zjzo
>
> At the bottom I give a description of the heating cycle and I am
puzzled to
> the larger temperature cycling in the latter part of the evening. This
is
> the same each day. The chart only shows the last 24 hours of each day
on a
> rolling cycle.
>
> The temperature of the boiler is shown as the green trace. Has anyone
any
> idea why I am seeing a much larger cycle at night. It always starts
off the
> same as the morning and midday cycles, but gradually increases. The
strange
> part is that it goes much lower too.
>
> I thought it was something to do with the outside temp as the boiler
is
> located in the garage, but tonight (the chart on the website was
uploaded
> tonight) has been a few degrees warmer than the last few nights which
where
> down to and below zero.
>
> Any ideas?
>
> Regards
> Dave...


UKHA 2004: 15th and 16th May 2004

http://www.automatedhome.co.uk
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