Water Drainage MCAC-UTSM-2008-11
132 Installation
For Four-way cassette
4.4 Convergent drainage
4.4.1. The number of indoor units should be as small as possible to prevent the traverse main pipe overlong.
4.4.2. Indoor unit with drain pump and indoor unit without drain pump should be in different drainage system.
4.4.3. Selecting the diameter
Number of connecting indoor units→Calculate drainage volume→Select the diameter
Calculate allowed volume =Total cooling capacity of indoor units(HP)×2 (l/ hr)
Allowed volume(lean 1/100) (l/ hr) I.D. (mm) Thick
Hard PVC ≤14∽ ￠25 3.0
Hard PVC 14＜ ≤88∽ ￠30 3.5
Hard PVC 88＜ ≤334∽ ￠40 4.0
Hard PVC 175＜ ≤334∽ ￠50 4.5
Hard PVC
334＜∽ ￠80
6.0
4.5 Drainage test
Drainage without drain pump
After finishing drainpipe installation, pour some water into the water receiver plate to check if the water flows
smoothly.
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