Midea MCD-18HRFN1-QRC4 Service Manual page 159

Controller
Remark:
The wired controller will reset to factory setting with auto mode, auto fan and 24℃ setting temperature when
the air conditioner restarts after power failure.
And this may cause inconsistent displays on the wired controller and on the air conditioner. You need to
readjust the running status through the wired controller.
Installation
Installation Notice:
When the air conditioner needs the constant frequency wire Controller, be sure adding a Wire Joint with 5
terminal named A, B, C, D, E in indoor unit, and fixing a infrared emitter whose anode and cathode
connecting with A and B near the receiver in the Indoor Unit Switch Board, then connecting the terminal +5v,
GND, Run in the Switch Board to C,D,E respectively.
NOTE
Never turn screws too tightly, or else the cover would be dented or the liquid crystal breaks.
Please leave enough long cable for maintenance of the wire controller board.
Electrical Control System 165