Midea MCD-48HRFN1-M(D) - Drainage Pipe Installation

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14.5 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.
14.5.1 Installation principle
 Ensure at least 1/100 slope of the drainage
pipe
 Adopt suitable pipe diameter
 Adopt nearby condensate water discharge
14.5.2 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)
Water flowrate (l/h)
12
2.4
18
4
24
6
30
7
36
8
42
10
48
12
60
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
Slope
1/50
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 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.
Too long distance
Gas bag