Midea MCA3U-18HRFNX-QRD0W Service Manual page 70

3. Indoor Unit Installation(Duct)
3.1 Service space for indoor unit
Air outlet
7.9 in (20cm)
Air inlet
3.2 Hang Indoor Unit
1. Please refer to the following diagrams to locate the four
positioning screw bolt hole on the ceiling. Be sure to mark
the areas where ceiling hook holes will be drilled.
For A6 Duct,
L
Capacity(KBtu/h)
18
2. Install and fit pipes and wires after you have finished
installing the main body. When choosing where to start,
determine the direction of the pipes to be drawn out.
Especially in cases where there is a ceiling involved, align
the refrigerant pipes, drain pipes, and indoor and outdoor
lines with their connection points before mounting the
unit..
3. Install hanging screw bolts.
1) Cut off the roof beam.
2) Strengthen the point at which the cut was made.
Consolidate the roof beam..
4. After you select an installation location,align the
refrigerant pipes, drain pipes, as well as indoor and
outdoor wires with their connection points before
mounting the unit..
5. Drill 4 holes 10cm (4") deep at the ceiling hook
positions in the internal ceiling. Be sure to hold the drill at
11.8
in
23.6 x23.6 (60cmx60cm)
in in
checking orifice
Air filter
Electric control box
Size of mounted plug
L
M
920/36.2 508/20
 Installation 7
a 90° angle to the ceiling.
6. Secure the bolt using the included washers and nuts.
7. Install the four suspension bolts.
(30cm)
8. Mount the indoor unit with at least two people to
lift and secure it. Insert suspension bolts into the unit's
hanging holes. Fasten them using the washers and nuts
provided.
9. Mount the indoor unit onto the hanging screw bolts
with a block. Position the indoor unit flat using a level
indicator to prevent leaks.
Shockproof cushion
Hanging screw bolt
Note: Confirm the minimum drain tilt is 1/100 or more.
3.3 Duct and accessories installation
1. Install the filter(optional) according to air inlet size.
2. Install the canvas tie-in between the body and duct.
3. The air inlet and air outlet duct should be far enough
apart enough to a avoid air passage short-circuit.
4. Connect the duct according to the following
diagram.
Air outlet
5. Refer to the following static pressure guidelines when

Screw nut
Overhang part
Washer
Canvas tie-in Canvas tie-in
Isolation booth
checking orifice
Isolation booth
Air inlet
Air dust filter