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THE INDOOR UNIT INSTALLATION
12
Indoor unit drain piping
- Drain piping must have down-slope (1/50 to
1/100): be sure not to provide up-and-down
slope to prevent reversal ow.
- During drain piping connection, be careful
not to exert extra force on the drain port on
the indoor unit.
- Remove the rubber stopple before connect-
ing drain hose.
- Hook on the bracket after connecting the
drain hose as below.
Drain piping
- The drain hose should point downward for
easy drain ow.
Wall
Indoor
Bracket
Drain hose
Downward
slope
Outdoor
Slope gradient for
drain Should be
1/50 ~ 1/100
- Do not make drain piping like the following.
Do not raise
Water
leakage
Tip of drain
hose dipped
in water
Water
leakage
Ditch
- Be sure to execute heat insulation on the
drain piping.
Heat insulation material: Polyethylene foam
with thickness more than 8 mm.
Drain test
Use the following procedure to test the drain
pump operation:
- Set the air direction louvers up-and-down to
the position(horizontally) by hand.
- Pour a glass of water on the evaporator
using a kettle.
- Ensure the water ows through the drain
hose of the indoor unit without any leakage
and goes out the drain exit.
Accumulated
drain water
Air
Water
Waving
leakage
Less than
50 mm gap
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