In your first post you said "It looks as it may be similar to a lil Dixell controller maybe." ISA used a number of controllers from different mfgs. that looked similar:
Carel, Carvel, Eliwell and Elstat. I think the are ALL Italian based companies.
I looked through my manuals for the above, but did not see anything that looks like what you have, but it may be an older model. Hope this helps