We own an outlet plaza with multiple RTU's.
For some time now we have been experiencing components being fried on a regular basis, the likes of relays, transformers,wiring, phase protectors and motors.
We initially related it to an unreliable utility supply so upon our techs recomendations, installed phase protectors on all the units.
This has not resolved the issues at all and I am now doubting our initial theory as the only culprit.
We recently lost power to one of the stores on two occasions (Feb 13th & 19th) resulting in replacement of fuses at the disconnect, and phase protector getting fried along with a few other components(relay, fuses, transformer and wiring) on the RTU.
We had a similar issue at another store where they lost all three fuses at the disconnect (Feb 10th), and then a few days later the RTU was found to have a fried phase protector and ventor motor along with a few other burnt components (fuses and control board).
An electrician that was called in seemed to think that it was the rooftops that caused the main fuses to fail? does this seem right?
Any assistance would be much appreciated as this has been an ongoing problem for some time and is costing us a great deal of money!
I have a great deal of respect for our various HVAC contractors, they are great guys and I dont doubt thier resolve, but it doesnt hurt to ask for another opinion.