Multi Variable Air Conditioners Duct Type Indoor Unit
16
17
◆
Size of air-return opening
1450
555
Fig 4.4.8
4.4.3 Installation of Air-return Duct
(1)
Square flange is defaulted to be fitted on the back before ex-factory. Air-return cover is on the
bottom, as shown in Fig 4.4.9.
Return Air Cover Plate
Bottom Return Air
Rear Return Air
Rectangular Flange
Fig 4.4.9
(2)
If air return from the bottom is needed, switch the positions of square flange and air-return
cover.
(3) Use a clincher to connect air-return duct to the air-return opening of indoor unit. The other end
of air-return duct connects with the air-return louver. In order to adjust the height conveniently,
you can make a folded canvas duct and have it strengthened by 8# iron wire.
(4) Air return from the bottom will produce more noise than air return from the back. So we
suggest you to add a noise damper and static pressure case to lower noise if you choose air
return from the bottom.
(5) Select the appropriate installation way based on actual construction and maintenance needs,
as shown in Fig 4.4.10.
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
Fig 4.4.10
