Part 3
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System Design and Installation
Table 3-5.2: Vertical drain piping diameters
5.4 Drain Piping for Units with Lift Pumps
Drain piping for units with lift pumps should take account of the following additional considerations:
A downward sloping section should immediately follow the vertically rising section adjacent to the unit, otherwise a
water pump error will occur. Refer to Figure 3-5.7.
Air vents should not be installed on vertically rising sections of drain piping, otherwise water may be discharged through
the air vent or water flow may be impeded.
Figure 3-5.7: Downward sloping section of drain piping
5.5 Drain Piping Installation
Installation of the drain piping should proceed in the following order:
Ensure that all joints are firm and once the drain piping is all connected conduct a watertightness test and water
Do not connect air conditioner drain piping to waste, rainwater or other drain piping and do not let air conditioner
drain piping come into direct contact with the ground.
For units with drain pumps, test that the drain pump functions properly by adding water to the unit’s drainage
pan and running the unit. To allow inspection and maintenance, the pipe clamps shipped with units should be
used to attach drain piping to indoor units – adhesive should not be used.
Drain piping
installation
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