Midea MCA3U-18HRFNX-QRD0W Service Manual page 71

installing the indoor unit.
Model(KBtu/h)
12
18
24~55
Change the fan motor static pressure according to external
duct static pressure.
NOTE: 1.Do not put the connecting duct weight on the
indoor unit.
2.When connecting duct, use inflammable canvas tie-in to
prevent vibrating.
3.Insulation foam must be wrapped outside the duct to
avoid condensate. An internal duct underlayer can be
added to reduce noise, if the end-user requires.
3.4 Adjust the air inlet direction(From rear
side to under-side.)
1. Take off ventilation panel and flange,
Ventilation panel
2. Change the mounting positions of ventilation panel and
air return flange .
Air return flange
3. When installing the filter mesh, fit it into the
flange as illustrated in the following figure.
Static Pressure(Pa)
0-60
0-100
0-160
Air return flange
Ventilation panel
 Installation 8
NOTE: All the figures in this manual are for demonstration
purposes only. The air conditioner you have purchased may
be slightly different in design, though similar in shape.
3.5 Fresh air duct installation
Dimension :
Duct joint for fresh air
Ø125mm(4.92")

Ø160mm(6.3")