I was recently informed that the customer said there was a short somewhere in the cooling tower system that caused all of the damage.

I am not convinced though. The only things burned up on this unit were on the 24V side of a transformer. Nothing else on the unit had to be replaced. This unit mated to a second unit that ran off of the same mains.

The units were interconnected via communications cables and some wires for dry contacts.

I think somebody accidently hooked up 120V to the 24V side. I do not remember how many times I have been on service calls that started out like "I had to jumper some stuff to get the compressor to start". !!!!!!

This controller is for an industrial chilled water evaporator.