41
Unit Installation
When the three-way valve is used for the condensate pipe, its straight two connectors should be kept
at the same level as
shown in the gure below.
Tee joint
When there are several indoor units at the same oor, their condensate is usually drained out through
one main pipe. In this
case, the branches pipe for each unit should be located higher than the main pipe.
The size of the condensate pipe is determined
by the capacity and number of the indoor units.
Size of the tee drain pipe should match with the running capacity of the unit.
As pressure at the water outlet is quite large, an water trap is required for the drain pipe, which is
applicable to the horizontal type air handing units and the indoor units of the duct type air conditioners.
A=P+25mm
B=P/2+25mm
P indicates the the passive pressure (mmH
2
O, 1mmH
2
O=9.80665pascals) .
The pipe diameter should be or larger than 32mm.
Water trap
(2) Insulating
The extended drain pipe should be insulated and special care must be paid to the elbows. See the
table below for the thickness
of the insulation.
Drain pipe (mm) Thickness of insulation (mm)
All ≥15
Insulation should be thickened at humid areas.
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