Design and Technical Manual
Table Of Contents
6. SYSTEM DESIGN
INDOOR UNIT8-2.
GENERAL RULES OF DRAIN PROCESS
Install the drain pipe with downward gradient (1/100 or more) and so there are no rises in the ●
pipe.
Use general hard polyvinyl chloride pipe and connect it with adhesive (polyvinyl chloride) so ●
that there is no leakage.
Support the drain pipe with supporters each 5 to 7 ft. (1.5 to 2.0 m) ●
Do not perfrom air bleeding. ●
Always heat insulate the indoor side of the drain pipe. ●
When connecting the drain hose to the indoor unit, use the accessory band. (Except wall ●
mounted type)
COMPACT CASSETTE TYPE
PVC pipe
(Local
arrangement)
(3/4 in.)
12 (300) or less
Max. 28 (700)
Attached band
drain hose
(accessory)
Downward
gradient 1/100
or more
Horizontal or
upward gradient
5 to 7 ft.
(1.5 to 2.0m)
Unit: in. (mm)
Hanging tting
Downward gradient
1/100 or more
Air bleeding
Rise
Trap
Not good
CAUTION
Drain lift-up pipe restrictions: ●
(1) Lift-up height ≤ 28 in. (700 mm) (from ceiling)
(2) Drain hose (pipe) length ≤ 12 in. (300mm) (between indoor unit and lift-up pipe)
When a dimensions exceed the above restrictions will cause water leakage. ●
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SYSTEM
DESIGN
SYSTEM
DESIGN