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B. THERMAL
SENSOR
This
is situated
in the duct
linking
the air filter
to the carburettor
( see diagram
below
).
__
Depending
on the temperature
of the inlet
air. it allows
or not vacuum
to reach
the control
capsule
for the flap and
the closing
plate.
It consists
of a number
of valves
and bi-metallic
strips.
To inlet
manifoldb-yTu-4
I
To vacuum capsule
Operating principle :
For an inlet
air temperature
below
6' C, the position
of the bi-metallic
strips
and the valves
is such that vacuum
in
the inlet
manifold
is communicated
to the capsule
(see
para. A, diagram
No. 1 )
For an inlet
air temperature
above
19" C, the bi-metallic
strips
change
shape.
and the position
of the valves
stops
the vacuum from reaching
the capsule
( see para A. diagram
No.2 ).
For an inlet
air temperature
between
6 and 19" C, the positions
of valves
and bi-metallic
strips
allow
the action
of
the vacuum
on the capsule
to be regulated.
In this case, the flap and the closing
plate
are in an intermediate
position,
allowing
simultaneous
supply
of warm and cold air.
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