Importance

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Abstract

A motor vehicle heating and ventilating, and/or air conditioning, installation includes a heating and air distribution unit comprising a casing, the inlet of which is connected to the delivery side of a motorised fan unit. The casing has two outlets, namely a 'feet' outlet leading to a lower part of the cabin of the vehicle, and a ventilation outlet, also leading into the cabin. The casing is divided into three ducts. Each of the first and second ducts has an upstream end open at the inlet of the casing, and a downstream end communicating with the feet and ventilation outlets of the casing respectively, under the control of a first flap valve and a second flap valve respectively. The third duct lies between the first and second ducts and has a central portion containing a heat exchanger. The upstream end of the third duct communicates, under the control of a third valve, with the inlet of the casing, and the third duct has two downstream outlets, namely a 'feet' outlet and a ventilation outlet, which communicate respectively, under the control of the first and second valves, with the feet and ventilation outlets of the casing. Control means are provided for acting selectively on the various valves so as to put them into selected positions.

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First Claim