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Specific Wiring Method
Connection method A:
This is the preferred method of control with the communicating control, Midea indoor and
outdoor unit. Refer to the wiring method of internal and external machine communication
and wired controller as follows:
Wired
Controller
HA HB
HA HB
Wired
Controller
WARNING
Please refer to the wiring nameplate for the wiring method. Do not connect
24V AC to S1 - S2, as this will damage the system.
Connection method B:
This is the preferred method when using a 24V thermostat with Midea indoor and outdoor
unit. To use a 24V thermostat, you need to refer to the following wiring:
R C G Y1 Y2 B W
NOTICE
The use of shielded communication or thermostat wire is not required, but
is recommended where separation from high voltage conductors can not be
maintained, or in areas with high electrical noise.
The shield and drain conductor must be grounded at the outdoor unit and stripped
back and taped at the indoor unit. Grounding at both ends results in an increase of
noise transmitted onto the signal wires.
When using a 24V thermostat, please refer to the non-communicating wiring diagrams
that follow:
Indoor Unit Display Board
R C L
G Y1
B W
Y1/Y2
Indoor Unit Display Board
R C G Y1 Y2 B W
W1
W2 E
DH L
24V Thermostat
Control
Board
W1
W2 E
DH
S1 S2
R C Y1 Y2 B W
D
L
Outdoor Unit
Control
Board
W1
W2 E
DH L
S1 S2
R C Y1 Y2 B W D L
Outdoor Unit
S1
S2
S1 S2
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