3) Indoor unit drain piping
①
Drain piping must have down-slope (1/50 to 1/100): be
sure not to provide up-and-down slope to prevent rever-
sal flow.
②
During drain piping connection, be careful not to exert
extra force on the drain port on the indoor unit.
③
The outside diameter of the drain connection on the
indoor unit is 1 1/4 inch.
Piping material:
Polyvinyl chloride pipe inner diameter
Ø1 inch and pipe fittings
4) Caution for gradient of unit and drain
piping
- Without drain pump:
• Always lay the drain with downward inclination (1/50 to
1/100).
Prevent any upward flow or reverse flow in any part.
• 7/32 inch or thicker formed thermal insulation shall always
be provided for the drain pipe.
Correct method
※
U-trap is not required for low static model in which the
external static pressure is below 50 pa(5mm Aq)
• Lay the drain hose with a downware inclination so water
will drain out.
Wrong method
10. Installation
20
_
Ceiling concealed duct - low static pressure
Indoor Units
Indoor unit
Drainage hole
Make sure to be closed.
Unit
Drainage pipe
(Local supply)
Thermal insulator
(Local supply)
1/50~1/100
1/50~1/100
1. Decline Installation of indoor unit is very important for
the drain of the duct type air conditioner.
2. Minimum thickness of the insulation for the connecting
pipe should be 7/32 inch.
CAUTION
1/50~1/100
Downward
1/50~1/100 or more
Approx 3/32~5/32 inch
Attached drain hose
