U-Match Series DC Inverter Service Manual
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Table 3-1-3
1.1.8 Installation of the Supply Air Duct
(1) Installation of the Rectangular Duct.
①. The maximum length of the duct means the maximum length of the supply air duct plus the
maximum length of the return air duct.
②. The duct is rectangular and connected with the air inlet/outlet of the indoor unit. Among all
supply air outlets, at least one should be kept open.
Bottom Return Air Installation only for Units 09/12/18k
(2) 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 Figure 3-1-21.
Figure 3-1-21
(3) If the bottom return air is desired, just change the place of the rectangular flange and the return
air cover plate.