RE: Central heating pump monitoring

["Benfield, John \(Penta\)" <john.benfield-eds@xxxxxxx>]

>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