Midea MOBA30U-12HN1-Q Service Manual page 228

Drainage pipe installation
According to the above table to calculate the total water flowrate for the confluence pipe selection.
For horizontal drainage pipe (The following table is for reference)
Reference value of inner
PVC pipe
diameter of pipe (mm)
PVC25
PVC32
PVC40
PVC50
PVC63
Attention: Adopt PVC40 or bigger pipe to be the main pipe.
For Vertical drainage pipe (The following table is for reference)
Reference value of inner
PVC pipe
diameter of pipe (mm)
PVC25
PVC32
PVC40
PVC50
PVC63
PVC75
PVC90
Attention: Adopt PVC40 or bigger pipe to be the main pipe.
6.2.3 Individual design of drainage pipe system

The drainage pipe of air conditioner shall be installed separately with other sewage pipe, rainwater pipe
and drainage pipe in building.
 The drainage pipe of the indoor unit with water pump should be apart from the one without water pump.
6.2.4 Supporter gap of drainage pipe

In general, the supporter gap of the drainage pipe horizontal pipe and vertical pipe is respectively
1m~1.5m and 1.5m~2.0m.

Each vertical pipe shall be equipped with not less than two hangers.
 Overlarge hanger gap for horizontal pipe shall create bending, thus leading to air block.
6.2.5 The horizontal pipe layout should avoid converse flow or bad flow
Drainage pipe
Water flow
Drain tee
224
Allowable maximum water flowrate (l/h)
Slope 1/50
20 39
25 70
31 125
40 247
51 473
Allowable maximum water flowrate (l/h)
20
25
31
40
51
67
77
Water flow
Water flow
Slope 1/100
27
50
88
175
334
220
410
730
1440
2760
5710
8280
Too long distance
Gas bag
Drainage pipe
Water flow
Drain tee
Water flow
Water flow
Remark
For branch pipe
Could be used for confluence pipe
Remark
For branch pipe
Could be used for confluence pipe
Drain tee
Drainage pipe
Water flow
Water flow
Water flow
Installation