Midea MUBU-12HRFN1-M Service Manual page 49


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
5. The horizontal pipe layout should avoid
converse flow or bad flow
Drainage pipe
Water flow
Water flow
Drain tee
Water flow
Branch pipe Water flow
Gas
Keep a certain degree

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.
Drainage pipe
Drainage pipe
Water flow
Water flow
Drain tee
Water flow
Water flow
Gas
Water flow
Main pipe
Main pipe
Branch pipe
Indoor unit
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.
Drain tee
Water flow
Water flow
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.
Indoor unit
Plug
9. The end of drainage pipe shall not
contact with ground directly.
46
Plug
Water storage pipe
Hanger
Down incline pipe
A:Length of horizontal pipe ≤ 150mm
B
B: Lift height ≤ the pump head of water pump
Flexible pipe 300mm
Blowhole
Indoor unit
More than 50mm
More than 25mm
Plug