Time Limited Recirculation, MCC and ECC I n the ICM climate control system menus there is a function for selecting time limited or constant recirculation. I f time limited recirculation is selected, the following applies: • I f the outside temperature is < +7°C the system returns to outside air after 3 minutes. • I f the outside temperature is > +20°C the system returns to outside air after 12 minutes. • At temperatures between + 7°C and + 20°C the system returns to outside air between 3 -12 minutes in a linear fashion.