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 (VP25Ø3/4 [I.D.], Ø1-1/6 [O.D.]) and connect it with adhe-
sive (polyvinyl chloride) so that there is no leakage.
• Support the drain pipe with supports each 1.5 to 2.0 m.
• 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 wall mounted
type)
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Compact cassette type
300 mm or less
Max. 700 mm
Attached band
Drain hose
(accessory)
Downward gradient
1/100 to 1/50
Horizontal
or upward
gradient
VP25
(Locally purchased)
1.5 m to 2.0 m
Downward gradient
1/100 to 1/50
Hanging fitting
Air bleeding
Rise
Trap
Ï
Ï
Ï
Prohibited
• Drain lift-up pipe restrictions:
– Lift-up height ≤ 700 mm (from ceiling)
– Drain hose (pipe) length ≤ 300 mm (between indoor unit and lift-up pipe)
• Water leakage may result from a failure to adhere to the restrictions above.
5-2. Indoor unit
- (06-66) - 5. Drain connection
SYSTEM
DESIGN
SYSTEM
DESIGN
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