Kaisai KOU-12HDN1, Service Manual

Page: 133 / 144

MLCAC-UTSM-2010-10 Water Drainage
Installation 129
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 1.5~2m
3). Precautions
① The diam eter of drainpipe should m eet the drainage requirem ent at least.
② the drainpipe should be heat
-insulated to prevent atomization.
③ Drainpipe should be installed before installing indoor unit. After powering on, there is som e
water in water-receiver plate. Please check if the
drain pump can operate correctly.
④ All connection should be firm .
⑤ W ipe color on PVC pipe to note connection.
⑥ Clim bing, horizontal and bending conditions are prohibited.
⑦
The dimension of drainpipe can’t less than the connecting dimension of indoor drainpipe.
⑧ Heat
-insulation should be done well to prevent condensation.
⑨
Indoor units with different drainage type can’t share one convergent drainpipe.
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
cm
5
0
c
m
4.3 Upwards drainage (drain pump)
For Four-way cassette(compact)