How to wire in the pilot valve on an Atlas Copco LE7
by David Zahn
(Parma Ohio USA)
Atlas Copco LE7 80g air compressor
I have an older Atlas Copco LE7 80g air compressor running with a 5HP 1PH 230v motor. The unit has a separate motor starter (2Pole contactor with OL and 2 NC/NO control switches.)
It also has a large unloader valve which is actuated with a pilot valve. The Pilot valve is a ASCO 8314C53 which I have 2 of (120/60 and a 230/60). I had bought a replacement for it but didn't see the voltage rating of the one I bought. Both valves work.
The compressor also has a 2Pole pressure switch.
The problem is that I don't have a wiring diagram for this compressor and I am not sure how to wire in the pilot valve so that it will open upon startup (actuating the unloader valve) and then closing upon full start so that the tank can fill.
Any help would be greatly appreciated!
Also, Please ignore the wiring in the photos. I was just trying to get it to run and was manually powering the pilot valve.