87
Fig 5-2 Tee Joint
When there are several indoor units at the same floor, 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 mmH
2
corresponding to the passive pressure.
The pipe diameter should be or larger than 32mm
Fig 5-3 Water Trap
5.5.4.2 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
A Series Modular-type Air-cooled (Heat Pump) Chiller
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