16
Indoor Unit
Installation
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
25~40 mm
1.0 m or less
Drain Pipe Work
