MLCAC-UTSM-2010-10 Water Drainage
Installation 121
For Four-way cassette
4.4 Convergent drainage
1). The number of indoor units should be as small as possible to prevent the traverse main pipe overlong.
2). Indoor unit with drain pump and indoor unit without drain pump should be in different drainage system.
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 1/50) (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
1). Drainage without drain pump
After finishing drainpipe installation, pour some water into the water receiver plate to check if the water flows smoothly.
2). Drainage with drain pump
Poke the Water Level Switch, remove the cover, use water pipe to pour 2000ml water into the water receipt plate through the① water
inlet.
Turn on t② he power to Cooling operation. Check the pump’s operation and switch on the Water Level Switch. Check the pump’s sound
and look into the transparent hard pipe in the outlet at the same time to check if the water can discharge normally.
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