Please refer to the wiring nameplate for the
wiring method. Do not connect 24V AC to
S1 - S2, as this will damage the system.
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:
Connection method A:
To use a 24V thermostat, you need to refer to the
following wiring:
Connection method B:
When using a 24V thermostat, please refer to the
non-communicating wiring diagrams that follow:
NOTICE
This equipment uses B functionality. This terminal
is energized for heating functionality.
Please ensure that thermostat configuration is set
up for B functionality.
Note: These methods are for use with a Midea
outdoor unit and a third party indoor unit
or cased coil and gas furnace.
S1-2 dip
switch to
be “ON”
24V connection DIP Switch setting as shown
in the picture:
Connection method C:
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.
ON
1
2
3 4
Outdoor Unit
Only Mode
CN6
TO 24V THERMOSTAT
S1
R C Y1 Y2 L
S2 B W D
S1
24V communication
24V must never be connected to S1 – S2. All wiring must be in
compliance with the above scenarios. Incorrect wiring will
cause irreversible damage to control.
