FORD 2015 F-550 v.1 - Manual (Page 108)

Defrost: Press the button to distribute air to the windshield vents and de-mister.
Air distribution to instrument panel and footwell vents turn off. You can use
this setting to defog and clear the windshield of a thin covering of ice. C
Air distribution control: Press these buttons to turn airflow from the
windshield, instrument panel, or footwell vents on or off. The system can
distribute air through any combination of these vents. D
A/C: Press the button to turn air conditioning compressor on or off. Use air
conditioning with recirculated air to improve cooling performance and efficiency. E
Note: In certain conditions, the air conditioning compressor may continue to
operate even after you switch off the air conditioning with the A/C button.
MAX A/C: Press the button to maximize cooling. Recirculated air flows through
the instrument panel vents, air conditioning automatically turns on, and the fan
automatically adjusts to the highest speed. F
Recirculated air: Press the button to switch between outside air and
recirculated air. When you select recirculated air, the air currently in the
passenger compartment recirculates. This may reduce the time needed to cool
the interior (when used with A/C) and may reduce unwanted odors from
entering your vehicle. G
Note: Recirculated air may turn off automatically (or be prevented from turning
on) in all airflow modes except MAX A/C to reduce risk of fogging. Recirculated
air may also turn on and off automatically in Panel or Panel and Floor airflow
modes during hot weather in order to improve cooling efficiency.
PASS TEMP: Turn to increase or decrease the air temperature on the passenger
side of the vehicle. This turns on dual zone mode. H
Fan speed control +: Press to increase the volume of air circulated in your
vehicle. I
AUTO: Press the button to turn on automatic operation. Select the desired
temperature using the temperature control. The system adjusts fan speed, air
distribution, air conditioning operation, and selects outside air or recirculated
air to heat or cool the vehicle in order to maintain the desired temperature. You
can also use the AUTO button to turn off dual zone operation by pressing and
holding the button for more than two seconds. J
Fan speed control -: Press to decrease the volume of air circulated in your
vehicle. K
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Climate Control