Selecting the diameter of the collective drainage pipe in the multi-modular air conditioning system

 Selecting the diameter of the collective drainage pipe in the multi-modular air conditioning system


Calculate the amount of water drained, based on the number of indoor units that will be connected to the collective drain pipe, and then select the pipe diameter. Calculate

2 liters / hour per horsepower of drained water produced by an indoor unit.

• It is assumed that the proportion of the area inside the tube is 0.1.

• The table below is for a horizontal tube.


Number of units                internal diameter (mm)        allowed volume (1/100 level difference)

      30 units                                    31                                                   88 liters per hour

     40 units                                     40                                                 175 liters per hour

     50 units                                     51                                                 334 liters per hour