1, the air conditioning drain pipe is connected to the indoor unit. When the air conditioner cools, the evaporator temperature of the indoor unit is low, and the hot air condenses into water, which flows out through the drain pipe after passing through the water tray of the indoor unit.
2. When heating, on the contrary, the indoor unit will not produce condensed water, and the outdoor unit will produce water. Of course, this is mainly because the water formed by defrosting of air conditioner and the water generated by outdoor unit will not flow into the drain pipe of indoor unit, but will be discharged through the drain hole at the bottom of outdoor unit. In China, it is generally not required to connect the drain pipe of the outdoor machine, so the water flows out from the outdoor machine.