LG LH247HV, Engineering Manual

Page: 60 / 72

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60 | duct (HIgH StatIc)
Ceiling-Concealed Duct (High Static) System Engineering Manual
reFrigerant PiPing deSign
condensate drain Piping
Condensate Drain Piping Insulation
The inside temperature of the drain piping can rise to about 50°F. When high temperature and humidity air touch the outside surface of the
drain pipe, condensation may form. To prevent condensation from forming, install polyethylene insulation 1/4 to 7/16 inches thick. Drain
piping must be properly insulated to prevent damage to the indoor unit and the ceiling.
Figure 52: Condensate Drain Piping Should Be
Properly Clamped at the Connections.
Figure 51: Condensate Drain Piping Trap.
Models with drain pump
Models without drain pump
Polyethylene insulation 10t
PVC drain pipe
Metal clamp
Drain pan
Thermal insulation(bend area)
Flexible drain hose
Thermal insulation (drain pipe area)
Flexible hose
Drain pump
PVC elbow
PVC
Max.
31-1/2 inches
11-13/16 inches or less
Common drain pipe
Figure 53: Properly Insulated Condensate Drain Piping.
Sharp crook Sharp bend
Clamp connection
Reverse slope
Water flow
Figure 54: Condensate Drain Piping Should Not Include Sharp Bends.
Drain Piping Leak Test
Test the condensate drain piping system for leaks 24 hours after installation is complete. Use only water to test the drain piping.
Insulation
required
Insulation
not required
Insulation that does not
fit--too loose
Insulation that fits
Figure 55: Do Not Reverse the
Slope for the Drain Connection.
Insulation
required
Insulation
not required
Insulation that does not
fit--too loose
Insulation that fits
Figure 56: Improperly Installed
Insulation — Too Loose.
Insulation
required
Insulation
not required
Insulation that does not
fit--too loose
Insulation that fits