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Drain Piping of Ceiling Concealed Duct
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 5mm.
• The unit must be or declined to wards drain hose while installation.
CORRECT
CAUTION FOR GRADIENT OF
UNIT AND DRAIN PIPING
• Alway lay the drain with downward inclination
(1/50 to 1/100).
Prevent any upward flow or reverse flow in any
part.
• 5mm or thicker formed thermal insulator shall
always be provided for the drain pipe.
CORRECT
• Install the P-Trap (or U-Trap) to prevent
a water leakage caused by the blocking
of intake air filter.
Drain Pipe
Drain Pump
Front of view
Drainage hole
1/50~1/100
1/50~1/100
MAX 700mm
CAUTION
Ceiling
INCORRECT
Drainage hole
Lay the drain hose with a downware
inclination so water will drain out.
Unit
Make sure to be closed.
INCORRECT
Applied U-Trap Dimension
A ≥ 70mm
B ≥ 2C
C ≥ 2 x SP
SP = External Pressure
(mmAq)
Ex) External Pressure
= 10mmAq
A ≥ 70mm
B ≥ 40mm
C ≥ 20mm
Installation
Thermal insulator
(Local supply)
Drainage pipe
(Local supply)
Drainage hole
B
C
U-Trap
A
Service Manual 71
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