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Install the Condensation Drain Pipe
• Drain piping must slope down or flow may reverse
back to unit.
• During drain piping connection, be careful not to exert
extra force on the drain port on the indoor unit.
• Refer to Table 14 for drain pipe sizing.
• Use polyvinyl chloride pipe.
1. Refer to Figure 21 and plan the drain pipe routing so
that the pipe will slope downward from the unit to its
end drain location.
2. Connect the provided flexible drain pipe to the main
drain pipe.
3. Pour water into the flexible pipe as shown in Figure 41
to test for leaks. Repair leaks if necessary
Figure.21: Drain Piping Slope
4. Route the flexible drain pipe to the unit and connect
the flexible drain pipe to the drain port of the indoor
unit.
5. Install field supplied polyethylene foam insulation 5/16
inch thick or greater on the flexible drain pipe and
position snugly against indoor unit.
Figure.22: Do Not Shaply Bend Drain Pipe
Figure.23: Testing the Drain Pipe
Drain Piping
•
Any holes through the ceilings, walls, etc., must be large enough
to accommodate the drain piping and insulation.
•
Select "#1" Draim pump as the top priority, and install "#2" Gravity if
it is unavoidable.
•
Drain piping must have down slope (1/50 to 1/100).
Ceiling
"#1"
Drain
Pump
use
D
rainage
hole
Drainage hole
"#2" Gravity use
Angle
0.5
~1
º
Angle
0.5
~
1º
S.A.
S.A.
A leak test must be performed 24 hours after the drainage system has
been installed.
Drain Leak Test
To prevent reversal flow, do not provide up and down slope.
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