Acme Transformer makes an array of autotransformers (buck/boost). I found their Tech Service Dept to be quite responsive and helpful with my need to go from from 208v single phase to 230v single phase.
I ordered the transformers they suggested.
Our grade school has 40 year old, Nesbitt thru-the-wall, low pressure, steam supplied air handlers. Each air handler serves one classroom and has one 1/8 HP, dual wound, 208/230v, single phase, double ended shaft motor which drives four squirrel cage blower wheels (two blowers on each shaft...
