Multi F LMU540HV Installation Manual

36 Multi Air Conditioner
Installation
CAUTION : The supplied flexi-
ble drain hose should not be
curved, neither screwed. The
curved or screwed hose may
cause a leakage of water.
[Ceiling Concealed Duct/Ceiling Cassette Type]
• Drain piping must have down-slope (1/50 to 1/100): be
sure not to provide up-and-down slope to prevent rever-
sal flow.
• During drain piping connection, be careful not to exert
extra force on the drain port on the indoor unit.
• The outside diameter of the drain connection on the in-
door unit is 32mm(1 1/4 inch).
• Be sure to install heat insulation on the drain piping.
Piping material: Polyvinyl chloride pipe inner
diometes Ø 25mm(1 inch) and pipe fittings
• Connect the main drain pipe to the exterior and
leave it provisionally until the test comes to an
end.
• Feed water to the flexible drain hose and check
the piping for leakage.
• Be sure to check the drain pump for normal op-
erating and noise when electrical wiring is com-
plete.
• When the test is complete, connect the flexible
drain hose to the drain port on the indoor unit.
The air conditioner uses a drain pump to drain water.
Use the following procedure to test the drain pump operation:
Heat insulation material: Polyethylene foam
with thickness more than 8mm(5/16 inch).
Drain test
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
1/50~1/100
Flexible drain hose
MAX : 700 mm(27 9/16 inch)
Feed water
Drain Pump
Drain pan
Flexible drain hose
(accessory)
Main
drain pipe
Glue the joint
Drain
port
Drain hose connection
Use the clip (accessory)
Flexible drain hose
1/50~1/100
Flexible drain hoseFlexible drain hoseFlexible drain hose
h The figure can be changed according to model.