Bottom Return Air Installation ONLY - 18K Units.
1. The default installation location of the rectangular flange is at the back and the return air
cover plate is at the bottom, as shown in Fig. 4.35 .
Fig. 4.35
2. If bottom return air is desired, change the place of the rectangular flange and the return air
cover plate.
3. Connect one end of the return air duct to the return air outlet of the unit by rivets and the
other to the return air louver.
4. More noise is likely to be produced in the bottom return air mode than the backward return air
mode, so it is suggested to install a silencer and a static pressure box to minimize the noise.
5. The installation method should be chosen with considering the conditions of the building and
maintenance etc., as shown in Fig. 4.36.
Fig. 4.36
Table 4.6 Installation of the return air duct
No. Name No. Name
1 Return Air Inlet (with filter) 4 Indoor unit
2 Canvas Duct 5 Supply Air Duct
3 Return Air Duct 6 Grille
MS-SVN043-EN
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