York HP Series, Service Manual, Page: 72 / 160

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 The correct installation will not cause
converse water flow and the slope of the
branch pipes can be adjusted freely
 The false installation will cause converse
water flow and the slope of the branch pipe
cannot be adjusted.
6. Water storage pipe setting
 If the indoor unit has high extra static
pressure and without water pump to
elevate the condensate water, such as high
extra static pressure duct unit , the water
storage pipe should be set to avoid
converse flow or blow water phenomena.
Indoor unit
More than 50mm
More than 25mm
Plug
Water storage pipe
7. Lifting pipe setting of indoor unit with
water pump
 The length of lifting pipe should not exceed
the pump head of indoor unit water pump.

The drainage pipe should be set down
inclined after the lifting pipe immediately to
avoid wrong operation of water level switch.
 Refer the following picture for installation
reference.
Flexible pipe 300mm
Hanger
A
A:Length of horizontal pipe ≤ 150mm
B: Lift height ≤ the pump head of water pump
Down incline pipe
B
8. Blowhole setting
 For the concentrated drainage pipe system,
there should design a blowhole at the
highest point of main pipe to ensure the
condensate water discharge smoothly.
 The air outlet shall face down to prevent dirt
entering pipe.
 Each indoor unit of the system should be
installed it.
 The installation should be considering the
convenience for future cleaning.
Blowhole
Plug
Indoor unit
Plug
Indoor unit
9. The end of drainage pipe shall not
contact with ground directly.
13.5.3 Drainage test
13.5.3.1. Water leakage test
After finishing the construction of drainage pipe
system, fill the pipe with water and keep it for
24 hours to check whether there is leakage at
joint section.
13.5.3.2. Water discharge test
1. Natural drainage mode(the indoor unit with
outdoor drainage pump)
Infuse above 600ml water through water test
hole slowly into the water collector, observe
whether the water can discharge through the
transparent hard pipe at drainage outlet.
2. Pump drainage mode
2.1 Disconnect the plug of water level switch,
remove the cover of water test hole and slowly
infuse about 2000ml water through the water
test hole, be sure that the water will not touch
the motor of drainage pump.