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Ensure at least 1/100 slope of the drainage
pipe
Adopt suitable pipe diameter
Adopt nearby condensate water discharge
12.5.2 Key points of drainage water pipe
installation
1.
Considering the pipeline route and
elevation
Before installing condensate water pipeline,
determine 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 flowrate is decided by the
capacity of indoor unit.
Relationship between water flowrate and
capacity of indoor unit
Capacity (x1000Btu)
12
18
24
30
36
42
48
60
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
PVC
inner
pipe
diameter of
pipe
(mm/in)
PVC25
20/0.79
PVC32
25/0.98
PVC40
31/1.22
PVC50
40/1.57
PVC63
51/2.01
Water flowrate (l/h)
2.4
4
6
7
8
10
12
14
Allowable
maximum
water flowrate
Remark
(l/h)
Slope
Slope
1/50
1/100
39
27
For
pipe
70
50
125
88
Could be used
247
175
for confluence
pipe
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
PVC25
PVC32
PVC40
PVC50
PVC63
PVC75
PVC90
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 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.
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 (3.28~4.92ft)
and 1.5m~2.0m(4.95~6.56ft).
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.
branch
5.
The horizontal pipe layout should avoid
converse flow or bad flow
70
Reference
value
of
Allowable
inner
maximum
diameter of
water
pipe
flowrate (l/h)
(mm/in)
20/0.79
220
25/0.98
410
31/1.22
730
40/1.57
1440
51/2.01
2760
67/2.64
5710
77/3.03
8280
Too long distance
Gas bag
Remark
For
branch
pipe
Could be used
for confluence
pipe
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