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        General >> Problems >> C/C Hysteresis
        
(Message started by: ADroste on Sep 12^th, 2004, 6:07pm)

Title: C/C Hysteresis
Post by ADroste on Sep 12^th, 2004, 6:07pm

C/C system delivers too cold air, if set to 22°C. Even setting temperature on both sides to 25°C does not convince the blower to supply warm air. With a setting of 26°C and higher on both sides I can enforce a warmer stream. Outside temperature is 19°C to 21°C. I performed a C/C reset apparently wiithout success.

Reading the C/C pages several times very carefully has not given me an understanding of how the system achieves a warm car in winter. Especially it is not clear to me, how the heat of the (engine) radiator circuit is mixed with the refrigerant circuit respectively, which electronically controlled valve is responsible for the mixture. Is cold and hot air mixed or are different temperatured fluids mixed, which both enter the evaporator block? It cannot be only the HBC, which is controlled by the SATC microcontroller.

Armin

Title: Re: C/C Hysteresis
Post by Snoopy on Sep 13^th, 2004, 8:22am

In the very of siplistic terms.. the car has a refrigerantion system which cools and DEHUMIDIFIES, and a 'normal' heater... when you want warm air the system take the cool dry air and then directs it over the heater matrix..... so with the CC on the inside of the car will never mist up .. If the ambient temp is high then the system sensors will read this and adjust the air temperatures accordingly.... Its well worth studying the diagrams of the heater matrix to see how the WHOLE system works...
I hope this explains it for you....

Title: Re: C/C Hysteresis
Post by ADroste on Sep 13^th, 2004, 8:28pm

on 09/13/04 at 08:22:45, Snoopy wrote:

.. If the ambient temp is high then the system sensors will read this and adjust the air temperatures accordingly...
I hope this explains it for you....

Not completely, but I now now that no liquid flows but air flows are mixed to achieve the preset "room" temperature.
Thanks for this help.

What is still open is the question, what is the actuator in this control system. It seems that it is a DC Motor with gearbox plus a position sensor, all together attached to an air flap. The motordriven flap will have two end positions: 1) only cooled air 2) only heated air enterring the interiour. Flap in the middle means a 50% mixture of both, and depending on the preset temperature value, presumingly the SATC module will turn the flap a little bit more in one direction or to the other by activating the motor-gearbox unit. Am I delirious?

Armin