it depends on what kind of switching system you want ...... a water heater timer would work if you are wanting to use time as a basis, it would be in line with the power to the unit
Thanks for all the input everyone.
Sonny T, I think you've hit the nail on the head. I have heard of such things, but have been desperately hoping to find a third party "off the shelf" solution, since my experience with Atlas Copco has been very poor, and ideally I'd prefer to not have anything more to do with them.
I'll give them a call though. I'm not too concerned about the cost (within reason). I'm looking at 150+ compressors across 56 sites for this problem, and in a lot of my locations I'm seeing perfectly good compressors having all manner of reliability problems merely because they are not getting used enough.
Thanks for all the help guys - this is a great and friendly forum. Not what you always find on the internet!
Hi!One way you could get them both to run often is to set the smaller compressor to load first, and when it cannot handle the load (probably fairly often) then the larger compressor will kick in until the load can be handled. However, that will keep the smaller compressor running most all the time.
But I'll still check on a control solution. It might require a microprocessor control that you program to do what you want.