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5
Drain piping
CAUTION
Following the Installation Manual, perform the drain piping work so that water is properly drained. Apply a
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 insulation.
Provide the area where the pipe connects to the indoor unit with proper insulation. Improper 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 65'7" (20 m) or less. For a long pipe, provide support
brackets at intervals of 4'11" to 6'7" (1.5 to 2 m) 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.
Support
4'11" to 6'7"
bracket
(1.5 to 2 m)
(Collective
piping)
Insulation
Downward slope
1/100 or more
Pipe material, size and insulation
The following materials for piping work and insulation process are locally procured.
Pipe material
Hard vinyl chloride pipe VP25 (Outer diameter 1.3" (32 mm)
Insulation
Foamed polyethylene foam, thickness: 0.4" (10 mm)
Connecting drain pipe
Insert flexible drain hose into upper drain pipe of main unit as far as it will go. Fix it with hose band.
REQUIREMENT
Mount the flexible drain hose using the hose band without using adhesive.
Hose band
Flexible
drain hose
21-EN
As long as possible
(Approx. 3.9" (100 mm))
Downward slope
1/100 or more
VP30
Incorrect
0.6" (15 mm) or less
Flexible
drain hose
Indoor unit
Hose band
0.4" (10 mm)
– 11 –
Gravitational drainage
1
Reattach the drain cap.
* For gravitational drainage, remove the white connector
(CN504) on the upper left of the circuit board in the
electrical control box.
2
Insert flexible drain hose into lower drain pipe and
fix it with hose band.
3
Remove drain pump connector CN504.
Drain up
Arched shape
When a down-gradient cannot be secured for the drain pipe, drain-up
piping is possible.
The height of the drain pipe must be 33.5" (850 mm) or less from
the underside of the indoor unit.
Trap
Take the drain pipe out of the drain pipe joint with the indoor unit in
11.8" (300 mm) or less, and bend up the pipe vertically.
Immediately after the pipe is bent up vertically, lay the pipe making a
down-gradient.
Upper pipe
Lower pipe
Move the drain cap from
the lower pipe to the
upper pipe.
CN504
Red
Black
For drain pipes that will be
connected after setup, make a
downward slope of 1/100 or more.
11.8" (300)
or less
Flexible drain hose
(supplied)
Drain up setup dimensions
22-EN
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