Drain Piping - Toshiba MMW-UP0271LQ-E Installation Manual

7

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.
• After opening the knockout hole, deburr the edge.
Burrs adhered to opening of the knockout hole may causes an injury by touching it.
Drain piping
Support bracket
1.5 m to 2 m
• 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.
• To avoid water leak, wrap some sealing tape around the screw part.
• Drain connection is made from steel. Do not connect the joint pipe made from stainless steel.
 Pipe material, size and insulator
The following materials for piping work and insulating process are procured locally.
Pipe material Hard vinyl chloride pipe, VP25A (Nominal outer diameter 32 mm)
Insulator Foamed polyethylene foam, thickness: 10 mm or more
45-EN
As long as possible (Appox. 10 cm)
Downward slope
1/100 or more
Drain connection R1
(steel)
– 23 –
 Connecting drain pipe
Wrap some sealing tape around the screw part to avoid water leak.
REQUIREMENT
• Connect the hard vinyl chloride pipes certainly so that water does not leak by using adhesive agent for vinyl
chloride.
• It takes some time to dry and indurate the adhesive agent. (Refer to the manual of adhesive agent.) Do not apply
any extra force on the connecting section until the adhesive agent dried.
 Check the draining
In the test run, check that water drain is properly performed and water does not leak from the connecting part of
the pipes. Check draining also when installed in heating period.
Check the water drainage is surely performed at the test run.
Check also no water leakage is found at the pipe connecting part.
Front panel
REQUIREMENT
Enter water gradually using a kettle or a hose from drain pan of the discharge port.
CAUTION
Pour water slowly.
If it is poured urgently, water is spread inside of the indoor unit resulted in a trouble.
Drain pipe
Water entering
46-EN