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Originally Posted by sy278
It will only generate cold air if the interior temperature is above the set level, and if its not massively above it will only produce cooled air.
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Don't forget, it also looks at the outside air temperature, I don't know what values the PID controller is set at, but I am assuming there would be a 'low limit' temperature to 'hold off ' the air con, along with a 'deadband' to stop the unit constantly switching from heating - cooling. Also remember the unit is trying to control the humidity as well (the temp sensor & humidity sensor are both behind the slotted vent to the left of the steering column). I can only presume that the unit is set to control the humidity at 50%RH as there is no adjustment.
It has been a bit 'warmer' here today, 23'C, so I put my Air Con on fully Auto, set the temp to 18'C and it cooled the car within a few minutes, I had to turn it up as I was getting a 'chill'.
'Comfort' level (UK) is 20'C and 50%RH, and the Cee'd will control at that no problem.
BTW, I am a HVAC controls engineer.
