... LED display 3.Fully-auto control CK200203 bus sub-engine air conditioner control panel: It is fully-automatically control the starting ... up, preheat, air conditioner start, as well the cooling of the sub-engine Function: Fully-automatic control, cool, fresh air, memory, error ... test standardTemp. control based on the temp. of return air inlet, the defrost sensor controls defrost temp., defrost on ...