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Water Drainage MLCAC-UTSM-2011-02
Installation
54
4. Water Drainage
4.1 Gradient and Supporting
1). Keep the drainpipe sloping downwards at a gradient of at least 1/50. Keep the drainpipe as short as possible and eliminate the air bubble.
2). The horizontal drainpipe should be short. When the pipe is too long, a prop stand must be installed to keep the gradient of 1/50 and
prevent bending. Refer to the following table for the specification of the prop stand.
Diameter Distance between the prop stands
Hard PVC pipe 25~40mm 1~1.5m
3). Precautions
The diameter of drainpipe should meet the drainage requirement at least.
①
the drainpipe s
②
hould be heat-insulated to prevent atomization.
Drainpipe should be installed before installing indoor unit. After powering on, there is some
③
water in water-receiver plate. Please check if the
drain pump can operate correctly.
All connection should be
④
firm.
Wipe color on PVC pipe to note connection.
⑤
Climbing, horizontal and bending conditions are prohibited.
⑥
The dimension of drainpipe can’t less than the connecting dimension of indoor drainpipe.
⑦
Heat
⑧
-insulation should be done well to prevent condensation.
Indoor units with different drainage type can’t share one convergent drainpipe.
⑨
4.2 Drainpipe Trap
1). If the pressure at the connection of the drainpipe is negative, it needs to design drainpipe trap.
2). Every indoor unit needs one drainpipe trap.
3). A plug should be designed to do cleaning.
Plug
5
0
c
m
5
0
c
m
4.3 Upwards drainage (drain pump)
For Four-way cassette(compact)