Boiler control update and query

["Dave McLaughlin" <dave@xxxxxxx>]

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...
---
Very funny Scotty, now beam down my clothes!!!
---
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http://www.v8carlton.com
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