Is it safe to run a 220v "Split-Phase" piece of equipment on 220v "single-phase"?
If you have a two phase system  with L1,L2 each measuring 110VAC to ground, then try to measure the voltage between L1 and L2. If the phases are lagging by 180 degrees you should get 220VAC, no transformer is needed, just connect the ground, L1, L2(instead of neutral). Make sure neutral wire is isolated from ground.