Thanks, but I think it's a version of one of these....https://files.engineering.com/getfile.aspx?folder=8fcc231f-3cce-4bbe-8142-216b707ccff7&file=IMG_5532.JPG
Did that circuit diagram upload correctly?
I'm seeing the wrong image.https://files.engineering.com/getfile.aspx?folder=1330e38f-f22f-4113-babd-a45d94676a77&file=IMG_5555a.jpg
This part of the circuit may be in relation to refrigeration or cooling in general.
I've been asked to evaluate this circuit but I don't know what IL1 is.
I assume BS21 is a switch, switching possibly temperature probes.
But I'm confused in general. Can anybody help...