Midea Forest MOAA31-12CN1-NB8, Technical Manual

 Installation

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 Page 43 

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3. Using insulation tape, wrap the signal wire, refrigerant 
pipes, and drain hose tightly together. Double-check that 
all items are bundled in accordance with the picture above.

NOTE:

•  Drain hose must be on bottom

Make sure that the drain hose is at the bottom of the 
bundle. Putting the drain hose at the top of the bundle 
can cause the drain pan to overflow, which can lead to fire 
or water damage.

•  Do not intertwine signal cable with other wires

While bundling these items together, do not intertwine or 
cross the signal cable with any other wiring

•  Do not wrap ends of piping

When wrapping the bundle, keep the ends of the piping 
unwrapped. You need to access them to test for leaks at 
the end of the installation process.

3.8  Mount indoor unit

3.8.1  If you installed new connective piping to 

the outdoor unit, do the following:

1. If you have already passed the refrigerant piping 
through the hole in the wall, proceed to 

Prepare 

refrigerant piping.

2. Otherwise, double-check that the ends of the refrigerant 
pipes are sealed to prevent dirt or foreign materials from 
entering the pipes.

3. Slowly pass the wrapped bundle of refrigerant pipes, 
drain hose, and signal wire through the hole in the wall.

4. Hook the top of the indoor unit on the upper hook of 
the mounting plate.

5. Check that unit is hooked firmly on mounting by 
applying slight pressure to the left and right-hand sides of 
the unit. The unit should not jiggle or shift.

6. Using even pressure, push down on the bottom half of 
the unit. Keep pushing down until the unit snaps onto the 
hooks along the bottom of the mounting plate.

7. Again, check that the unit is firmly mounted by applying 
slight pressure to the left and the right-hand sides of the 
unit.

3.8.2  If refrigerant piping is already embedded 

in the wall, do the following:

1. Hook the top of the indoor unit on the upper hook of 
the mounting plate.

•  Unit is adjustable

Keep in mind that the hooks on the mounting plate are 

smaller than the holes on the back of the unit. If you find 
that you don’t have ample room to connect embedded 
pipes to the indoor unit, the unit can be adjusted left or 
right by about 30-50mm (1.25-1.95in), depending on the 
model.

Move to left or right

30-50m m

(1.2-1.95in)

30-50m m

(1.2-1.95in)

2. Use the holder in the mounting plate to prop up the 
unit, giving you enough room to connect the refrigerant 
piping, signal cable, and drain hose.

3. Connect drain hose and refrigerant piping (refer to 
Refrigerant Piping Connection section of this manual for 
instructions).

4. Keep pipe connection point exposed to perform the leak 
test (refer to Electrical Checks and Leak Checks section of 
this manual).

5. After the leak test, wrap the connection point with 
insulation tape.

6. Remove the bracket or wedge that is propping up the 
unit.

7. Using even pressure, push down on the bottom half of 
the unit. Keep pushing down until the unit snaps onto the 
hooks along the bottom of the mounting plate.