DC Inverter Duct Type Unit
22
(2). The default installation location of the rectangular flange is at the back, as shown in Fig.37.
Return Air Cover Plate
Bottom Return Air
Rear Return Air
Rectangular Flange
Fig.37
(3). If the bottom return air is desired, just change the place of the rectangular flange and the
return air cover plate.
(4). 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. For the sake of the convenience to freely adjust the height, a
cutting of canvas duct will be helpful, which can be reinforced and folded by 8# iron wire.
(5). 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.
(6). The installation method can be chosen with considering the conditions of the building and
maintenance etc., as shown in Fig.38.
1
Return air
Return air
Install the Return Air Duct (a)
Supply air
Supply air
Install the Return Air Duct (b)
1
2
4
5
3
6
4
5
Supply air
Supply air
Return air
Return air
Install the return air duct (b)
Install the return air duct (a)
Fig.38 Install the return air duct
Table 10 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
