"Derek *" wrote in message
...

This is a variable off delay timer/relay. Cost = £35.00 but is all you
need except for a bit of din rail to mount it on.

You don't really need a circuit digram. The unit takes 240v power and a
pair of contacts close when power is applied, they stay closed after power
is removed for the duration selected by a knob on the front (up to 10
mins) . Connection to the unit is via screw terminals so no other
plugs/sockets/connectors needed in yr. box.



This is difficult to discuss without a diagram - but isn't there a danger
that the power to the pump will also be fed back to the boiler switched
live, enabling the boiler to fire again during the pump overrun time?

James




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