Im a Engineer of a building in chicago ive been working on these units for over six years now. They are Kritzer combinex units the combinex means it can run heated or chilled water through the 2 pipe system. The kritzer fan coil unit runs using a 1/6 hp motor controled by an inducer (looks like a transformer) this controls the speed to the motor it was made by carson which no longer manufactures these anymore. part #2576 stamped on it. Also the strap on thermostat is actually more like change over switch this is what is used to go from Heat to cooling. This part if made is impossiable to find so i tested out a few over the years the the part i use is a TAC Erie Thermostatic Change over Switch part #680-243-x your white wire goes to your switch L1 of kritzer unit,black wire is for Heat and, Blue is for Cool to wall t-stat. If you have problems with the motor on the fan coil unit i recommened using a Fasco D-158 3-speed motor and abandoning the inducer/transformer. If you have any other questions please feel free to ask.
