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Vertical/Horizontal Air Handler Unit Drain Information
Note:
Install a field-supplied external condensate pan underneath the entire
vertical air handler unit to avoid damage due to condensate overflow.
Vertical / Horizontal Air Handler units have a gravity drain.
• Avoid blocking filter access panel when connecting drain lines.
• An additional external condensate line should run from the unit
into the pan.
• The entire condensate line should be drained from the external
condensate pan.
• Point the drain hose downward for easy drain flow.
•
Do not use pipe joint connection or PVC/CPVC for the unit
drain line connection. Use Teflon® tape.
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 18 for drain pipe sizing.
• Use polyvinyl chloride pipe.
1. Refer to Figure 36 and plan the drain pipe routing so that the pipe
will slope downward from the indoor 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 38 to test for
leaks. Repair leaks if necessary.
Figure 36: Drain Piping Slope.
Pipe clamp
Indoor unit
Maintenance
drain port
4. Route the flexible drain pipe to the indoor 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 37: Do Not Sharply Bend Drain Pipe.
Upward
routing
not allowed
Flexible drain hose
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
CONDENSATE PIPING
Figure 34: Vertical / Horizontal Air Handler Unit Drain Piping System.
Figure 35: Vertical / Horizontal Air Handler Unit U-Trap Specifications.
• Install the U-Trap to prevent leaks
caused by blocking the intake air filter.
Applied U-Trap Dimensions
A ≥ 2-9/16 inch
B ≥ 2C
C ≥ 2 x SP
SP = External Pressure
(in. WG)
C
Ex) External Pressure
= 0.4 in. WG
A ≥ 2-9/16 inches
A
B ≥ 1-7/12 inches
C ≥ 13/16 inches
Figure 38: Testing the Drain Pipe.
Pour water to
test for proper
drainage and
no leaks
Drain Pump
Drain pan
3/4 inch
connector
B
U-Trap
Flexible drain hose
Main drain pipe
Drain
Glue the joint
port
Drain hose clip (provided)
45
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