Star Delta starters and timers....

[Marvo]

I think from what I'm hearing that actually getting the Y-D starter running is the least of your worries. You need to figure out exactly what the original design was when it was installed. This fan could be control interlocked with one or more other control systems and you need a complete overview of the local control and it's integration with other remote systems. If this fan is part of a building pressurization system for example then incorrect interlocking and integration could cost lives.

My advice is to get help from someone who's capable of signing off the entire system when it's complete. In a nutshell, two words; cover yourself.

 

[Tiny Spark]

Cheers Marvo, Like I said above I think this Job has been taken way out of my comfort zone now and become over complex for my limitations and knowledge.
It started as a straight forward part swap and has now turned into a mass scale controls nightmare!
And thanks to some insight and ideas from darkwood may not even be what we originally thought it to be.

So as they say on the den "ime out"

But I will keep you all updated on what the outcome is once it has been decided upon LOL