Design Technical Manual

Table Of Contents
5-2. INDOOR UNIT
GENERAL RULES OF DRAIN PIPING
Install the drain pipe with downward slope (1/100 or more) and so there are no rises in the
pipe.
Use general hard polyvinyl chloride pipe (ø3/4 [I.D.] ; ø1-1/16 [O.D.]) and connect it with
adhesive (polyvinyl chloride) so that there is no leakage.
Support the drain pipe with supports each 60 to 79in. (1.5 to 2m)
Do not install any air vents or traps.
Always insulate the drain pipe to prevent condensation.
When connecting the drain hose to the indoor unit, use the accessory band. (Except
compact wall mounted type and wall mounted type)
COMPACT CASSETTE TYPE
11in. (300mm) or less
Max. 27in.
(700mm)
Attached band
drain hose
(accessory)
Downward
slope 1/100 or
more
Horizontal or
upward gradient
ø3/4 [I.D.] ; ø1-1/16 [O.D.]
(Locally purchased)
60. to 79in. (1.5 to 2.0m)
Hanging tting
Downward gradient
1/100 or more
Air vent
Rise
Trap
Prohibited
Drain lift-up pipe restrictions:
(1) Lift-up height ≤ 27in. (700mm) (from ceiling)
(2) Drain hose (pipe) length ≤ 11in. (300mm) (between indoor unit and lift-up pipe)
When a dimensions exceed the above restrictions will cause water leakage.
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