Page 37
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:
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:
Wiring
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:
Outdoor Unit
RC L G
Y1
Y1/Y2
B W W2 EW1 DH
R C Y1 Y2 B W L S1DS2
S1 S2
Indoor Unit Display Board
Wired
Controller
Wired
Controller
HA HB
HA HB
Control
Board
Outdoor Unit 24V Thermostat
RCGY1Y2BW W2EW1 DH L
RCGY1Y2BW W2EW1 DH L
R C Y1 Y2 B W D L
S1 S2
S1 S2
Indoor Unit Display Board
Control
Board
To Next Page
Loading...
