. OPERATION EXPLANATION OF COMPONENTS circulated. Use this setting when air is dirty. 3 - 88 FRESH/RECIRC SELECTOR SWITCH Use th is switch (5 ) to switch b etween r ecirculation of the a ir inside the ca b and intak e of fresh air from outside When this switch is pressed, recirculation of insid e air is selected and (A ) lights up on the displa y monitor. If the s witch is pre ssed again, intake of fres h air is selected and (B) lights u p on the di splay monit Recirculation of a ir inside cab Only t he air insid e the cab is carryin Intake of fresh air from outsid Air fro m the outsi de is taken i cab. when taking in fresh air from outside or when removing t he mist from the windo