York HP Series Service Manual page 71

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)
PVC25 20
PVC32 25
PVC40 31
PVC50 40
PVC63 51
Attention: Adopt PVC40 or bigger pipe to be the
main pipe.
For Vertical drainage pipe (The following
table is for reference)
Reference
PVC value of
pipe inner
diameter of
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
Allowable
maximum
Remark
water
flowrate (l/h)
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.
5. The horizontal pipe layout should
avoid converse flow or bad flow
branch
Water flow
Drain tee
Branch pipe
Keep a certain degree
68
pipe (mm)
20 220
25 410
31 730
40 1440
51 2760
67 5710
77 8280
Too long distance
Gas bag
Drainage pipe
Drainage pipe
Water flow
Water flow
Drain tee
Water flow
Water flow
Gas
Main pipe
Branch pipe
For branch
pipe
Could be used
for confluence
pipe
Drainage pipe Drain tee
Water flow
Water flow
Water flow
Water flow
Water flow
Gas
Water flow
Main pipe