Multi Variable Air Conditioners Duct Type Indoor Unit 
13 
(8)  Each unit should be installed with one water-sealed joint. 
Unit: mm 
 
Fig 4.12 
(9)  The horizontal pipe can be connected to vertical pipe in the same level; please select the 
connection way as shown in Fig4.13~ Fig4.15 
 
 
Fig 4.13          Fig 4.14        Fig 4.15 
①
  : Connection of drainage pipe joints (Fig 4.13) 
②
  : Connection of downspout elbow (Fig 4.14) 
③
  : Inserting pipe connection (Fig 4.15) 
(10) The installation height of raising pipe for drainage should be lower than 850mm. The gradient 
from raising pipe towards drainage direction should be at least 1%~2%. If the raising pipe is 
vertical with the unit, the raising height should be less than 800mm.   
 
Fig 4.16 
(11) Drain pipes should have a downward slope of at least 1%~2%, in order to prevent pipes from 
sagging, install hanger bracket at intervals of 1000~1500mm. 
 
Fig 4.17