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Sorry i was not clear in my origanal message, how do you size a chiller compared to the sq footage of the building.

Can anybody help? are there any general rules for the sizing of chillers in an industrial application? I am familiar with the heat loss calcs but not for chiller sizing, does it work the same way i.e. delta T.

Yes i have checked the amps while there is no load on the secondary side and it is reading approx 1.3 amps steady, it is hard to see the inrush as it is so fast and my ammeter takes some time to display the results. It is as if the transformer is de-magentising once the mains power is switched...

Yes the primary fuses are blowing while there is no load on the secondary side. So i am understanding this correct that it sounds like a faulty transformer? or is it down to the fuse sizing? Thanks for everybodys help so far.

I am using time delay fuses, and i forgot to mention that i have secondary protection on the transformer also which should allow me to go to 250% on the primary side. But it seems like i shouldn't have to, unless the transformer is faulty.

I have a 1500VA control transformer fitted with 5 amp primary fuses. The incoming voltage is 490V and the control voltage is 120V. The primary fuses will pop when the mains power is turned on, even when no motors nor controls are operational. If i fit 20 amp fuses, these will not pop, so i...