Re: Central heating pump monitoring

["Richard Challis" <richard@xxxxxxxxxxxxxxxxxx>]

Another idea that we have used on industrial gear.

Temperature sensor before and after the pump. couple of feet distance.

If the temperature is a close match then you have flow. Also depends on how
the flow goes through the system - some have a slight flow anyhow thanks to
a pump else where.

Cheers

Richard


----- Original Message -----
From: "Benfield, John (Penta)" <john.benfield-eds@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, February 09, 2006 10:14 AM
Subject: RE: [ukha_d] Central heating pump monitoring


> >You can put a mains-rated relay in the power circuit for the pump
(i.e.
> the relay coil is wired to the pump power supply) and then pick up a
set
> of contacts from the "other" side of the relay as detection
that the
> pump has power. Relays normally come with a couple of contacts which
are
> either normally open (NO) or normally closed (NC) when the coil is
> de-energised, the contacts change state when the coil sees power i.e.
> the NO contact closed and completes the sensing circuit back to your
"HA
> control system" and/or the NC contact opens breaking the circuit.
>
> That could work - and in my scope of understanding. I'll have a look.
>
> >How are you currently switching the pumps on & off? Do you
have a
> 5-zone controller?
>
> The setup is;
> Under Floor Heating : 2 pumps
> Radiators : 1 pump
> Solar heating : 1 pump
> Boiler : 1 pump
> DHW : 1 pump
>
> Yes I know that's 6 pumps, I missed on before.
>
> The Solar is on it's own controller. This does have an RS232
connection,
> but it's actually a RJ11 and I'm having difficulty getting the pin
outs.
> The DHW is via an existing flow switch.
> The boiler is from a timer plus a couple of thermostats.
> The rads will be via a room stat (Heatmiser) , but it's not yet
> connected.
> Part of UFH is via a number of room stats and a dedicated controller
> (Heatmiser) and part is by a mixing value thermostat.
>
> All of this goes back to what can only be described as a solid state
> controller on my thermal store. By using a relay I should be able to
> pickup when boiler and UFH are being called for, but others might need
a
> bit a investigation to see where I can pickup the electrical feed from
> (without disturbing the setup too much).
>
> JB
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
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