St205 Heater Controls

[J&A]

I've got a 94 ST205 fitted with climate control. It's the first time I've owned a motor with this particular facility, but I think I have all the various switches sussed- with one exception! In the centre of the control panel theres a switch marked AUTO in the middle, a symbol of a fan at one end and two arrows at the other. Its possible to activate either end of this switch, and when doing so it overrides the existing setting for one of its own- the "fan" end alters the speed of the fan, the "arrows" end modifys the direction of delivery of the air. That much I understand but whats the logic behind it all, and is it meant to operate in conjunction with the a/c?

[GT4 BOOSTER]

auto keeps the cabin at the set temperature using the aircon - econ keeps it at the set temperature using the outside air.