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Peterbilt 579 - MAX Defrost Mode

Peterbilt 579
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HEATING AND AIR CONDITIONING
3
on the HVAC control. In the partial
automatic mode, the AUTO button
indicator will cease to be illuminated.
Instead, the indicator of the adjusted
setting will illuminate.
For example,
if the driver adjusts the
fan dial while in AUTO mode, the
fan dial indicator will illuminate and
fan speed will adjust to the setting of
the dial. However, the temperature
and air outlet settings will continue to
function automatically. Similarly, if user
adjusts the air distribution setting while
in AUTO mode, the air distribution
dial indicator will illuminate and the
distribution will adjust to the setting
of the dial. The fan and temperature
settings will continue to function
automatically.
Economy Function
An economy
function is also available
in partial automatic mode. In this mode
the system will operate in AUTO mode
without the
use of the A/C compressor.
The operator may select economy
by initiating AUTO mode and then
pressing the A/C button to disengage
the compressor. The indicators for A/C
compressor and AUTO mode do not
illuminate while operating in economy
mode.
MAX Defrost Mode
The heating and air conditioning
system provides for one touch
windshield defrosting. Certain driving
conditions will cause fog or ice to form
on the windshield. By pressing the
MAX defrost button, the HVAC system
will automatically adjust the blower
speed, air temperature, and air outlet
distribution to maximize clearing of the
windshield. The system will remain in
this mode until the driver presses the
button again or adjusts the dials.
Note that the air temperature in MAX
defrost mode will be set to the warmest
temperature setting. This setting helps
to clear the windshield of ice and fog
more quickly. Outside air mode and
A/C compressor are also active to
maximize performance.
3-84
Y53-6047–2C (04/13)

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