Drain Piping - Toshiba R410A Installation Manual

6

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.
Support
bracket
1.5 m to 2 m
(Collective
piping)
Heat insulator
Downward slope
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
(Approx. 10 cm)
Downward slope
1/100 or more
VP30
Incorrect
– 11 –
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.
Flexible drain hose
Arched shape
Trap
Flexible drain hose
Hose band
15 mm or less
Indoor unit
Hose band
10 mm
22-EN