Midea Forest MOAA31-12CN1-NB8 Technical Manual page 42

• Signal Cable: H07RN-F
Table: Minimum Cross-Sectional Area able of Power and
Signal Cables
Rated Current of
Appliance (A)
> 3 and ≤ 6
> 6 and ≤ 10
> 10 and ≤ 16
> 16 and ≤ 25
> 25 and ≤ 32
> 32 and ≤ 40
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.
The Wiring Diagram is located
on the inside of the indoor unit's
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,
 Page 42 
Nominal Cross-Sectional
Area (mm²)
0.75
1
1.5
2.5
4
6
Terminal block
Wire cover
Screw
Cable clamp
wire cover.
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
Drain hose
Signal wire
2. Using adhesive vinyl tape, attach the drain hose to the
underside of the refrigerant pipes.
Space behind unit
Refrigerant piping
Insulation tape