Volvo VNL 780 Operator's Manual page 126

116 INSTRUMENTS AND CONTROLS
Recirculation
Press recirculation to circulate the air in the cab. Only a small amount of air is taken directly
from outside.
The light in the button comes on when the button is pressed for air recirculation.
Temperature Control Settings ECC
Maximum Cold Setting
The temperature knob should be set to the far left. The fan speed knob should be set to
AUTO and the air distribution knob should be on AUTO.
Maximum Heat Setting
The temperature knob should be set to the far right. The fan speed knob should be set to
AUTO and the air distribution knob should be on AUTO.
Normal Setting
When the temperature control is set to any temperature between 18 C and 27 C (64 F
and 80 F), the ECC automatically adjusts itself close to the selected temperature, similar
to a thermostat
Fan Speed
The fan speeds are 1 through 4. The fan will not operate when "0" is selected, but air will
flow when set to fresh air mode due to ram air effect when the truck is moving.
•
The ECC automatically circulates air at fan speed 4 when there is a big difference
between the selected temperature and the temperature measured by the in-cab sensor.
However, as the temperature in the cab gets closer to the selected temperature, the
fan speed begins to slow down.
•
If maximum cold or maximum heat are selected, the ECC automatically circulates air
at fan speed 4 when AUT is selected. At any other selected fan speed the system
adjusts and conforms to the chosen speed.