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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 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 apping.
Install the collective piping as shown in the following gure.
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
bracket
1.5 to 2 m
Heat insulator
Downward slope
1/50 to 1/100
Downward slope
1/50 to 1/100 or
more
Pipe material, size and insulator
The following materials for piping work and insulating process are locally procured.
Pipe material
Hard vinyl chloride pipe VP25 (Nominal outer diameter 32 mm)
Insulator
Foamed polyethylene foam, thickness: 10 mm or more
21-EN
As long as possible
Arched shape
VP-30
Trap
Incorrect
– 11 –
Connecting drain pipe
Insert exible drain hose into the drain pipe of main unit as far as it will go. Fix it with hose band.
REQUIREMENT
Mount the exible drain hose using the hose band without using adhesive.
Flexible drain hose
Drain up
When install the drain pump kit (TCB-DP40DPE) of optional accessory, read the Installation Manual supplied to a
drain pump kit.
Check the draining
Check if the water can ow out properly during the test run. Also, check if no water leakage from the piping
connection port.
REQUIREMENT
Conduct the drain test even in the heating season.
If it is before the duct work, pour water into the drain pan through the air outlet.
If it is after the duct work, remove the access panel and pour water, then conduct the drain check.
EN
Access plate
EN
EN
EN
20 mm or less
Flexible drain hose
Indoor unit
Drain pipe
10 mm
Hose band
Pour into the drain pan
Hose band
22-EN
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