Unusual use of M8/M9 to control a compressor

[ngwagwa]

The old way with household wiring was to use an "intermediate" switch . Could you not wire a relay to provide similar
http://www.lightwiring.co.uk/wp-cont...ng-diagram.jpg

That would give me a circuit like this (I think) you will have to forgive me I have some sort of mental block when it come to even the simplest wiring.


An intermediate would work but I would prefer it so that when UCCNC is calling to air it can't be overridden.