DC INVERTER MULTI VRF INSTALLATION
169
Fig. The specification of collecting drainage hose shall be suitable to the working capacity of the
unit
We may collect the drainage hoses of all the indoor units in one system (An outdoor unit and
all the indoor units connected to this outdoor unit are called one system), or collect the drainage
hoses of all the indoor units in several systems.
The ceiling height must be considered, and a specific gradient shall be ensured along the
water flow direction. The cassette-type indoor unit is provided with water pump, and the maximum
lift of its drainage hose is 280mm.
¾ During installation, please take care that:
The diameter of drainage hose connected to the indoor unit must meet the specifications. The
pipe diameter shall not be too small; otherwise the water may overflow.
The main drainage hose depends on the number of indoor units. Generally, it is required to be
equal to or higher than ф35mm.
The drainage hose shall be thermally insulated. The thickness of thermal insulation pipe must
meet the requirements. The clearance between thermal insulation pipes shall be sealed with
adhesive sticker.
Please discharge the water to the ground drain, water closet or any other place easy to drain the
water out.
b) After installation, check if the drainage is smooth.
3) Wall-mounted Type
Assemble the drainage hose as shown below and take measures to prevent condensing.
Improper assembly of the drainage hose may cause leakage, or even expose the furniture to
moisture.
a) Assembly of drainage hose
¾ To avoid air in water elbow, the drainage hose shall be kept as short as possible and inclined
downward, as shown below.
¾ During connection, please use PVC pipe of equal size higher than this size (Nominal Dia,:
20mm; Outer Dia.: 26mm)
¾ The drainage hose must be arranged in down inclination along water flow direction, thus to
avoid air bubble blocking. Take care not to arrange the pipe in twisting, protrusion or
waveform. Do not put the outlet of drainage hose into water.
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