Control Head Selector Lever: Hi

The system will start up in the same manner as in LO or AUTO. Blower will operate only at "Hi Blower" speed (blower switch and resistor board is bypassed by direct circuit through control head) and conditioned air will be delivered through both the air conditioning and heater outlets (bi-level operation). If maximum air conditioning is required, air door will close off outside air intake and inside air will be recirculated for maximum cooling.