Duct / distributor assembly

DUCT / DISTRIBUTOR ASSEMBLY

The assembly illustrated in cross section in the diagram below is the main component of the system and consists of a duct (1) and a heater-distributor assembly (2).

The duct (1) consists of two parts, a lower one and an upper one; the right part of the latter is shaped in such a way that it matches perfectly with the right upper surface of the dashboard (area below the windscreen by the bulkhead between the engine compartment and the passenger compartment) which it is in contact with.

There are two rectangular shaped openings in the upper part of the duct at the top on the right side; the first is in an almost horizontal position matching with the one in the dashboard and therefore in contact with the outside ambient, whilst the other one is facing the passenger in an almost vertical position, allowing the intake of air in the passenger compartment.

There is a flap (3) fitted on the inside of the duct, at the top, which is directed by a special actuator which can take up a position between closed and one of the above mentioned two openings.

There is an electric fan (4) fitted inside the duct in the lower part by the above mentioned openings which, when supplied at different voltages, can rotate at different speeds.

The heater-distributor assembly basically consists of a casing which houses the following, in order:

• a mixture flap in the centre which, directed by a knob via a cable either does or does not allow the entire air flow introduced by the fan (4) or part of it to come into contact with the finned surface of the heater radiator (5);
• the heater radiator (5) in the centre at the bottom, with inlet and outlet connectors projecting beyond the right side surface of the above mentioned assembly;
• four flaps, at the top and the front, which, directed by a knob via a special actuator, a toothed sector and a splined disc with a distribution function, either shutter or completely close the section of the internal ducts which direct the air to the footwell vents, the front vents and the vents for demisting the windscreen.

The evaporator (6) is located between the duct (1) and the distributor (2).