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CONDENSATE PIPING INFORMATION
Condensate Drain Connection
Condensate drain trapping and piping must conform to all applicable codes. A U-trap and drain line must be installed. The U-trap cannot exceed
6 inches from the drain connection. The lines need to be the same pipe size or larger than the drain connection. Include a U-trap, and pitch
downward toward the drain. An air break should be used with long condensate line runs.
• Failure to install U-traps can result in an overflow of condensate water. This can lead to product damage or property damage. Draw-through
cooling coils will have a negative static pressure in the drain pan area. This can cause an un-trapped drain to back up due to the air being
pulled up through the condensate drain piping.
• The value of pressure in the drain pipe should be at least equal to the absolute value of the negative static pressure in the drain pan plus
one inch.
The Split Rooftop Unit has one inch condensate drain connection on end of condensate pan. The piping for the condensate drain and external
trap can be completed after the unit is in place. See Figure below.
All Split Rooftop Units must have an external trap for condensate drainage. Install a trap at least 4 inches (102mm) deep and protect against
freeze-up. If drain line is installed downstream from external trap, pitch line away from the unit at 1 inch per 10 feet (25mm per 3m) of run.
Do not use a pipe size smaller than the unit connection (1 inch).
Figure 27: U-Trap Specifications.
• Install the U-Trap to prevent leaks
caused by blocking the intake air filter.
Applied U-Trap Dimensions
A ≥ 4 inch
B ≥ 2C
C ≥ 2 x SP
SP = External Pressure
(in. WG)
Ex) External Pressure
= 0.4 in. WG
A ≥ 2-9/16 inches
B ≥ 1-7/12 inches
C ≥ 13/16 inches
42
Plain 1 inch
connector
B
C
U-Trap
A
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.
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