– 32 –
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.
Drain kit (Option)
For drain-up kit installation.
Refer the installation manual supplied with
the drain-up kit.
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.
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.
Fig. 9-5-2
Fig. 9-5-3
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.
Fig. 9-5-4
Fig. 9-5-5
Trap
Over thread
Support
bracket
1/100 or more
downward grading
Thermal
insulator
Indoor
unit
1.5m to 2m
50 mm
or more
Do not put the drain hose end
into water or drainage ditch.
Shield pipe (local parts)
Extension drain hose
Inside the room
Drain hose
Larger as possible (Approx. 100mm)
25 or more
Downward grading
1/100 or more
20
20
20
Extended
ventilating pipe
Drain hose
Be sure to apply
thermal insulation.
Elbow thermal
insulation cover
Insert the hose completely
up to the end.
