Ductwork; Condensate Drain Piping - LG 3828A20229B Installation Manual

Ductwork

1. Ductwork construction guidelines
Connections to the unit should be made with three-inch canvas connectors to minimize noise and vibration
transmission.
Elbows with turning vanes or splitters are recommended to minimize air noise and resistance.
The first elbow in the ductwork leaving the unit should be no closer than three times blower diameter to
avoid turbulence and back pressure.
2. Attaching Horizontal Ductwork to the Unit
All conditioned air ductwork should be insulated to minimize heating and cooling duct losses. Use minimum
of 2" of insulation with a vapor barrier. The outside ductwork must be weather proofed between the unit
and the building.
When attaching ductwork to a horizontal unit, provide a flexible water tight connection to prevent noise
transmission from the unit to the ducts. The flexible connection must be indoors and molded out of heavy
canvas.
: Do not draw the canvas taut between the solid ducts.
NOTICE

Condensate Drain Piping

A 3/4 inch male condensate drain connection is located on the corner of the unit next to the evaporator
section access panel. A trap should be installed and filled with water before starting the unit to avoid air
from being drawn through. Follow local codes and standard piping practices when running the drain line.
Pitch the line downward, away from the unit, and avoid long horizontal runs. See Figure 3.
Do not use reducing fittings in the drain lines.
The condensate drain must be:
1. Made of 3/4" pipe size.
2. Pitched 1/4" per foot to provide free drainage to convenient drain system.
3. Trapped
4. Must not be connected to closed drain system.
Attention
Be careful to not to have any double "U" trap as it may cause the drain water to leak.
Panel Enclosure
3/4 Inch Male
Static pressure
Drain Pan
Installation of Unit
Cleanout
Plug
Figure 3
Installation Manual 11