I have an elderly WC RollAir 500 (i think this is the model as there is no ID plate fitted). Three phase - 60cfm Three phase supply. 24v pressure switch. Had someone in to rewire the compressor. They started the job but never returned so at the moment i have a rats nest of wiring without the pressure switch or timer having been wired in. Nightmare. I need a wiring diagram or someone with a knowledge of wiring compressors please.