Samsung CNH NDB Series Technical Data Book page 77

Installation
CAUTION
Check that the indoor unit is level with the ceiling by
using by using a level.
• Install air ventilation to drain condensation smoothly.
• If it is necessary to increase the height of the drain
pipe, install the drain pipe straight within 11.81
inch(300 mm) from the drain hose port. If it is raised
higher than 21.65 inch (550 mm), there may be water
leaks.
Drain hose
Band joint
• Do not give the hose an upward gradient beyond
the connection port. This will cause water to flow
backwards when the unit is stopped, resulting in water
leaks.
Air ventilation
Ceiling
0.79 inch (20 mm) or more
1/100 or more
21.65 inch(550 mm)
11.81 inch (300 mm)
or less
or less
Ceiling
Under gradient
Ceiling
• Do not apply force to the piping on the unit side when
connecting the drain hose. The hose should not be
allowed to hang loose from its connection to the unit.
Fasten the hose to a wall, frame or other support as
close to the unit as possible.
Support pieces
• Install horizontally.
Be horizontal
Indoor unit
Flexible hose
• Max. allowable aixs gap
Indoor unit
• Max. allowable bending angle
Indoor unit
NOTE
• If a concentrated drain pipe is installed, refer to the
figure below.
3.28 to 4.92 ft (1 to 1.5 m)
1/100 or more
Ceiling
Max. 0.79 inch (20mm)
Max. 30°