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
h 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
- With drain pump
① Possible drain head height is upto 27 6/19 inch. So the
drain head should be below 27 6/19 inch.
② Keep the drain hose downward upto 1/50~1/100 inclina-
tion. Prevent any upward flow or reverse flow in any part.
③ 7/32 inch or thicker insulation should be provided for the
drain pipe.
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.
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