14. Installation
14.5Drain Pipe Work
❑Drain pipe gradient and support
1)- 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.
Indoor unit
Gradient of at least 1 / 100 (1cm/ 1m)
2)Suspension bolts should be used to 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
Class | Nominal diameter | Spacing |
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Rigid PVC pipe | 25~40mm | 1.0m or less |
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3)The length of pipe laid horizontally should be kept a minimum.
❑Drain trap
Fit any indoor unit whose drain pipe connection is subjected to negative pressure, with a drain trap.
1) Rig the drain trap as shown in the drawing below
Indoor unit
H
H | H: 50mm or more |
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2)Provide one trap per unit. A single trap for converging units will prove ineffective.
3)Rig the trap to allow for future changing.
Plug
Indoor unit
Indoor unit |
Plug
2004 Product Data 75