Re: Boiler control update and query

["Paul Robinson" <ukcueman@xxxxxxx>]

Not only is the magnitude of the evening oscillations greater, but the
frequency is lower. About 2
peaks per hour instead of 5. Couple that with the fact that the peak of the
temperature oscillations
is around the same as the just-switched-off peak following the morning and
afternoon sessions, it
suggests that in the evening, the boiler is turning off more than it is
during the day. That would
give you the reduced frequency and bigger oscillations.

Maybe this is because, as Kevin suggested, after running for 2 hours,
everything has gotten warm and
so your central heating system can't lose heat to the house so quickly, and
so it needs to spend
more time turned off before it drops its temperature. The outside
temperature might help this
effect, depending on how well insulated you are, because the evening shows
as the highest outside
temperature making it harder for the central heating to lose heat.

Paul

----- Original Message -----
From: "Kevin Hawkins" <lists@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, December 17, 2003 12:53 AM
Subject: RE: [ukha_d] Boiler control update and query


> One other thought - you mentioned the 'valve' turning off and causing
the
> peak - is there any possibility this valve is opening and closing at
all in
> some way at night - or is it literally switched by the timer. Not
quite sure
> what closes and opens the valve from the description.
>
> The bigger oscillations seem inkeeping with water not flowing through
the
> boiler (or a much reduced flow rate)- perhaps pump switching or the
valve or
> maybe it is the TRV's - very interesting Dave..
>
> K
>
>    > -----Original Message-----
>    > From: Dave McLaughlin [mailto:dave@xxxxxxx]
>    > Sent: 17 December 2003 00:28
>    > To: ukha_d@xxxxxxx
>    > Subject: RE: [ukha_d] Boiler control update and query
>    >
>    > All radiators are on all the time so it seems strange, but
>    > you could be right and with a bit more temperature sensing
>    > in the rest of the house I might be able to track it down.
>
> Maybe some just don't reach the TRV level on the shorter run times -
have to
> tape some DS1820's to the radiators too !


UKHA 2004: 15th and 16th May 2004

http://www.automatedhome.co.uk
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