I figured it out. The delay control is ac in DC out there is a transformer in the delay.
The reason I was told as to the dc coils is ac coils make a buzz when engaged dc coils r quiet.
So then what about the buzz off the inverters????? WTF can't have that. LOL. Let the truth be known unmuffled buzzing from inverters thats a points deduction for a prevo.
Persheatecha Gill. Thanks