Just a light commercial guy but looking for info on this unit. its attached to a ICP PGS120L250AA RTU. Found alll the wiring diagrams but need to know the settings on the option switch for FA vs. RA intake.

switch has settings for A,B,C, and D

anyone have setup docs on this?

Thanks all and have a safe Happy New Year!

Also this is for a 100 person movie theature so opinions on the fresh air side to keep co2 down to what it should be.