LG CRNN Series, Installation Manual

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Common Installation Process
77
Indoor Unit Drain Pipe Work
Indoor unit drain pipe work
1) Drain pipe gradient and support
a) - The drain pipe must be fitted at a gradient of at least 1/100.
- The drain pipe should be as short as possible and free from airlocks.
2) Drain trap
Fit any indoor unit whose drain pipe connection is subjected to negative pressure, with a drain trap.
a) Rig the drain trap shown in the drawing below.
b) Provide one trap per unit. A single trap for converging units will prove ineffective.
c) Rig the trap to allow for future changing.
b) - Suspension bolts should be used th support long stretches of drain pipe in order to ensure that a
gradient of 1/100 is maintained (PVC pipe should not be bent)
Spacing of supports for horizontal piping
c) - The length of pipe laid horizontally should be kept a minimum.
Gradient of least 1 / 100
(1cm / 1m)
Indoor unit
Indoor unit
H
H
Indoor unit
Plug
Indoor unit
Plug
Class Norminal diameter Spacing
Rigid PVC pipe 25~40mm 1.0m or less