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Installation Manual
EN-21 EN-22
5 Drain piping
CAUTION
Following the Installation Manual, perform the drain piping work so
that water is properly drained. Apply a heat insulation so as not to
cause a dew condensation.
Inappropriate piping work may result in water leakage in the room
and wet furniture.
• Provide the indoor drain piping with proper heat insulation.
• Provide the area where the pipe connects to the indoor unit with proper heat insulation. Improper heat insulation will cause
condensation to form.
• The drain pipe must be sloping downward (at an angle of 1/100 or more), and do not run the pipe up and down (arched
shape) or allow it to form traps. Doing so may cause abnormal sounds.
• Restrict the length of the traversing drain pipe to 20 meters or less. For a long pipe, provide support brackets at intervals of
1.5 to 2 meters to prevent flapping.
• Install the collective piping as shown in the following figure.
• Do not provide any air vents. Otherwise, the drain water will spout, causing water to leak.
• Do not allow any force to be applied to the connection area with the drain pipe.
• A hard PVC pipe cannot be connected to the drain pipe connecting port of the indoor unit. Be absolutely sure to use the
flexible hose provided for the connections with the drain pipe connecting port.
• Adhesive agents cannot be used for the drain pipe connecting port (hard socket) of the indoor unit. Be absolutely sure to
secure the pipe using the hose bands provided. Use of an adhesive agent may damage the drain pipe connecting port or
cause water to leak.
Arched shape
1.5 m to 2 m
Support
bracket
Heat insulator
Downward slope
1/100 or more
(Collective
piping)
As long as possible
(Approx. 10 cm)
Downward slope
1/100 or more
VP30
Trap
Incorrect
Drain pipe
connecting port
(Hard socket)
Attached hose band
Adhesive inhibited :
Use the attached flexible hose and hose band for connecting
the drain hose to the clear drain socket. If applying the
adhesive, socket will be damaged and cause water leakage.
Indoor unit
Soft socket
Hard socket
Socket for VP25
(Locally procured)
Attached flexible hose
VP25 vinyl chloride pipe
(Locally procured)
15 mm or less* 10 to 12 mm
Hose band tightening
margin
Indoor unit
VP25 vinyl chloride pipe
(Locally procured)
Drain pipe
connecting port
(Transparent)
10 mm
Flexible hose
(Accessory)
Heat
insulator
Socket for VP25 vinyl
chloride pipe
(Locally procured)
* Natural water draining (Lower pipe): 5 mm or less
Pipe material, size and insulator
The following materials for piping work and insulating process are procured locally.
Connection of drain hose
• Connect a hard socket (locally procured) to the hard socket of the attached supplied flexible hose.
• Connect a drain pipe (locally procured) to the connected hard socket.
REQUIREMENT
• Connect hard vinyl chloride pipes securely using an adhesive for vinyl chloride to avoid water leakage.
• It takes some time until the adhesive is dried and hardened (refer to the manual of the adhesive). Do not apply
stress to the joint with the drain pipe during this time period.
Insert the flexible drain hose into the upper drain pipe and fix it with the hose band.
Gravitational drainage
Gravitational drainage can be changed to natural water draining for models with a drain pump by following the steps
below.
1 Remove the drain pump connector CN504.
* For gravitational drainage, remove the white connector (CN504) on the P.C.
board in the electrical control box.
2 Move the plug to the upper pipe from the lower pipe on the side that will
be used.
Pipe material Hard vinyl chloride pipe VP25 (Nominal outer diameter Ø32 mm)
Insulator Foamed polyethylene foam, thickness: 10 mm or more
Upper pipe
Hose band
Flexible
drain hose
CN504
White
ML.book Page 11 Wednesday, March 14, 2018 10:28 AM
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