Installation
Page 128
5. Drainage Pipe Installation
Install the drainage pipe as shown below and take
measures against condensation. Improperly installation
could lead to leakage and eventually wet furniture and
belongings.
5.1 Installation principle
• Ensure at least 1/100 slope of the drainage pipe
• Adopt suitable pipe diameter
• Adopt nearby condensate water discharge
5.2 Key points of drainage water pipe
installation
1. Considering the pipeline route and elevation.
• Before installing condensate water pipeline, deter-
mine its route and elevation to avoid intersection
with other pipelines and ensure slope is straight.
2. Drainage pipe selection
• The drainage pipe diameter shall not small than the
drain hose of indoor unit
• According to the water flowrate and drainage pipe
slope to choose the suitable pipe, the water flow-
rate is decided by the capacity of indoor unit.
Relationship between water flowrate and capacity of
indoor unit
Capacity (kBtu) Water flowrate (l/h)
12 2.4
18 4
24 6
30 7
36
8
42 10
48
12
55
14
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)
PVC
pipe
Reference
value of inner
diameter of
pipe (mm)
Allowable
maximum water
flowrate (l/h)
Remark
Slope
1/50
Slope
1/100
PVC25
20 39 27
For branch
pipe
PVC32
25 70 50
PVC40
31 125 88
Could be used
for confluence
pipe
PVC50
40 247 175
PVC63
51 473
334
Attention: Adopt PVC40 or bigger pipe to be the main
pipe.
For Vertical drainage pipe (The following table is for
reference)
PVC
pipe
Reference
value of inner
diameter of
pipe (mm)
Allowable
maximum water
flowrate (l/h)
Remark
PVC25
20 220
For branch
pipe
PVC32
25 410
PVC40
31 730
Could be
used for
confluence
pipe
PVC50
40 1440
PVC63
51 2760
PVC75
67 5710
PVC90
77 8280
Attention: Adopt PVC40 or bigger pipe to be the main
pipe.
3. Individual design of drainage pipe system
• The drainage pipe of air conditioner shall be in-
stalled 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.
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 cre-
ate bending, thus leading to air block.
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