Where did they find that? Germany had many foundies, one of the oldest survived WWII is called Buderus. It is the area of Wetzlar and still in operation. It casted plates to build wood stoves since the 1600s.
Baker compressor unit, runs either SO2 or NH3. Probably for an apartment building, each with its own cold-box.
Looks like an old RUUD coal fired conversion.
Heat exchanger, can be installed as a de-superheater on discharge, or to preheat water.