Drain Piping Work - Toshiba RAS-M10GDV-E Service Manual

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9-5. Drain Piping Work

9-5-1. Piping Material
• For laying pipes under ground, use hard vinyl chloride
pipe. (Inner diam. 20 or 25mm)
9-5-2. Piping and Cautions
• Set drain side of pipe at downward slope.
(1/100 or more)
• Be sure to apply thermal insulation (foaming polyethyl-
ene, 10mm-thickness or more) for pipes passing
through the room.
• Adhere the connecting sections with vinyl chloride
agent surely so that no water leakage is caused.
• Support the piping with hanging bracket so that force is
not applied to connection sections of pipe and pipe is
not waved with connected pipes.
NOTES :
• Do not make slack or trap at halfway of pipes.
• Set pipes so that the end of drain pipe is not dipped in
water, and also keep space with 50mm or more to the
ground.
• After piping work, check water drains smoothly.
• Hole should be made at a slight downward slant to the
outdoor side.
• When connecting extension drain hose, insulate the
connecting part of extension drain hose with shield
pipe.
9-5-3. Connection of the Drain Hose
• Insert the drain hose completely into the connecting
port of the drain pan.
• Apply thermal insulation surely to the drain hose
with elbow thermal insulation cover.
Insert the hose completely
up to the end.
Drain hose
Elbow thermal
insulation cover
Fig. 9-5-5
Larger as possible (Approx. 100mm)
20
25 or more
Be sure to apply
thermal insulation.
– 32 –
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1.5m to 2m
Indoor
unit
1/100 or more
Thermal
downward grading
insulator
Over thread
Trap
Fig. 9-5-1
• As shown in the figure, set the collective piping
such as the ceiling duct so that waste water
does not back up from the main pipe.
50 mm
or more
Fig. 9-5-2
Shield pipe (local parts)
Inside the room
Drain hose
Fig. 9-5-3
20 20
Downward grading
1/100 or more
Fig. 9-5-4
Drain kit (Option)
For drain-up kit installation.
Refer the installation manual supplied with
the drain-up kit.
Support
bracket
Do not put the drain hose end
into water or drainage ditch.
Extension drain hose
Extended
ventilating pipe