In an earlier contribution to this discussion,
Tom wrote:

I want to make up some electrical safety signs for a little
connection box near my boiler, in which in time I hope to add a time
delay circuit/ or component for the pump. I need standard stick on
signs e.g. lightning symbol, Isolate before opening, Danger 240V etc
does anyone know where I can obtain some free ClickArt to download.
I also need a 240 V ac circuit diag or suggestions for a pump "off"
delay Cheers
Tom

Sorry, can't help with ClickArt.

With regard to pump delay, I would suggest using a pipe stat mounted on the
flow pipe close to the boiler rather than a timer. This will run the pump
until the boiler has cooled sufficiently and is preferable to an arbitrary
delay.

The stat needs to have changeover contacts. Connect NC (the low temp
contact) to boiler switched live. Connect NO (the high temp contact) to
permanent live. Connect COM to the pump.

When the boiler starts up from cold, the pump will also run. When the flow
temperature exceeds the pipe stat setting, the stat contacts will change
over - and the pump will now be powered from the permanent live, and will
continue to run. When the boiler is turned off by the programmer or room
stat, the pump will continue to run until the flow temperature drops below
the pipe stat setting.
--
Cheers,
Set Square
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