buck- boost

[puckman]

we are getting a 15 ton ac roof unit , it uses 3 phase 208v. Our service is 3 phase 240v. Will a buck boost transformer work for this application? If not does anyone have an idea as to how to supply 208v to ac unit? Company went and ordered 2 units, 1 using 3phase 208v. and the other one using 208-230v. Name plate on second one says it can operate at a low of 190v and a high of 252v. We are thinking that this one will be ok at 240v. We are waiting to here back from Carrier ac. Anyone have any info on this?
Thanks for your imput.

 

[winnie]

See http://www.solaheviduty.com/products/transformers/buckboost/index.html#selection in particular:
http://www.solaheviduty.com/products/transformers/pdfs/bboost/bbselect3ph.pdf
http://www.solaheviduty.com/products/transformers/pdfs/bboost/bbeconns.pdf

This may be possible; it looks like you would use connection 'F2'. Note that if the unit requires 120V derived from the 208V neutral, you will have other problems. If possible, get units designed for the proper voltage; motors are inherently transformers; select the proper winding and they will work at whatever voltage you supply. It is almost always a tremendous waste to use a motor with a separate transformer.

-Jon

 

[raider1]

Yes, a couple of buck-boost transformers would work. But I would seriously check the with the manufacturer first to see if the A/C unit will work on 208 volts.

Chris