R410A 60Hz Top-discharge Outdoor Series Technical Manual
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Ceiling 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)
集中排水管
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
4.5.1Drainage without drain pump
After finishing drainpipe installation, pour some water into the water receiver plate to check if the water flows
smoothly.
4.5.2 Drainage with drain pump
①
Poke the Water Level Switch, remove the cover, use water pipe to pour 2000ml water into the water
receipt plate through the water inlet.
②
Turn on the 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.
