SMART Series 451 Service Manual page 106

SN_Typ 451_us.book Seite 105 Freitag, 30. November 2007 1:56 13
For safety reasons, if the air distribution lever is
moved precisely to "Windshield Defrost", the air
conditioning switches itself on automatically with no
action by the occupants in order to ensure that the
windshield is defrosted and dried as quickly as
possible.
In this case the function LED does not light up to indi-
cate that the air conditioning has been activated
automatically.
When the air distribution lever is moved away from the
Defrost position, this function is canceled. This
happens regardless of the programmed temperature
or blower stage. In addition, air recirculation mode is
deactivated if it is on.
i Note
The air conditioning cannot be operated in
temperatures below 37 °F (3 °C).
Heater/AC operating unit
The air recirculation flap and the temperature blend
flap are actuated via electric actuator motors.
The cooling output of the refrigerant compressor is
controlled by means of an appropriate CAN signal
from the SAM control unit.
The interior temperature is measured by an integral
interior temperature sensor located on the bottom of
the heater/air conditioning operating unit.
Air recirculation mode
When the air recirculation mode button is pressed, the
fresh air flap is closed. This causes the air to circu-
late in the interior compartment only. The function
LED in the button lights up during air recirculation
mode.
i Note
The temperature-regulated air conditioning
switches off temporarily:
• If the engine speed is too low
• When starting up
• At a coolant temperature greater than 239 °F
(115 °C),
• At outside temperatures below 37 °F (3 °C).
Introduction of the smart fortwo, Model Series 451
Climate control
P83.40-3926-00
105