Midea Forest MOAA31-12CN1-NB8, Technical Manual

 Installation



 Page 42 



•  Signal Cable: H07RN-F

Table: Minimum Cross-Sectional Area able of Power and 
Signal Cables

Rated Current of 

Appliance (A)

Nominal Cross-Sectional 

Area (mm²)

> 3  and  ≤ 6

0.75

> 6  and ≤ 10

1

> 10  and ≤ 16

1.5

> 16  and ≤ 25

2.5

> 25  and ≤ 32

4

> 32  and ≤ 40

6

1. Prepare the cable for connection:

•  Using wire strippers, strip the rubber jacket from both 

ends of signal cable to reveal about 40mm (1.57in) of 
the wires inside. 

•  Strip the insulation from the ends of the wires.
•  Using wire crimper, crimp u-type lugs on the ends of 

the wires.

2. Open front panel of the indoor unit.

3. Using a screwdriver, open the wire box cover on the 
right side of the unit. This will reveal the terminal block.

Terminal block

Wire cover

Screw

Cable clamp

The Wiring Diagram is located 

on the inside of the indoor unit’s 

wire cover.

4. Unscrew the cable clamp below the terminal block and 
place it to the side.

5. Facing the back of the unit, remove the plastic panel on 
the bottom left-hand side.

6. Feed the signal wire through this slot, from the back of 
the unit to the front.

7. Facing the front of the unit, match the wire colors with 
the labels on the terminal block, connect the u-lug and 
and firmly screw each wire to its corresponding terminal.

8. After checking to make sure every connection is secure, 

use the cable clamp to fasten the signal cable to the unit. 
Screw the cable clamp down tightly.

9. Replace the wire cover on the front of the unit, and the 
plastic panel on the back.

NOTE:

•  Choose the right cable size

The size of the power supply cable, signal cable, fuse, and 
switch needed is determined by the maximum current 
of the unit. The maximum current is indicated on the 
nameplate located on the side panel of the unit. Refer to 
this nameplate to choose the right cable, fuse, or switch.

•  Take note of fuse specifications

The air conditioner’s circuit board (PCB) is designed with a 
fuse to provide overcurrent protection. The specifications 
of the fuse are printed on the circuit board, such as: 
T3.15A/250VAC, T5A/250VAC, etc.

•  Pay attention to live wire

While crimping wires, make sure you clearly distinguish the 
Live (“L”) Wire from other wires.

•  All wiring must performed strictly in accordance with 

the wiring diagram located on the back of the indoor 
units front panel.

•  Do not mix up live and null wires.

This is dangerous, and can cause the air conditioning unit 
to malfunction.

•  The wiring connection process may differ slightly 

between units.

3.7  Wrap piping and cables

Before passing the piping, drain hose, and the signal cable 
through the wall hole, you must bundle them together to 
save space, protect them, and insulate them.

1. Bundle the drain hose, refrigerant pipes, and signal 
cable according tothe picture below:

Indoor Unit

Space behind unit

Refrigerant piping

Drain hose

Signal wire

Insulation tape

2. Using adhesive vinyl tape, attach the drain hose to the 
underside of the refrigerant pipes.