Hisense HD Pro R454B Wiring Diagram

454B UNITS ARE USING A "O" INSTEAD OF THE "B" LIKE THE 410A UNITS.  ALSO, NOTICE WIRING DIAGRAM AND PLACEMENT OF LV FROM INDOOR UNIT TO OUTDOOR UNIT, IT LANDS ON DIFFERENT TERMINALS.  SEE WIRING DIAGRAM BELOW

ALSO SEE NOTE 4 ON WIRING LV TERMINAL "L" 

Note:

1. Wiring must be performed according to wiring diagram that pasted on indoor unit.
2. The YY2-th wire between the indoor and outdoor units is not indispensable, especially when the outdoor unit is connected to an indoor unit of a different brand.  It is more energy-saving when the outdoor units is connected to an indoor unit of the same brand by Y/Y2-th wire.  However, it still can run without it.
3. Since the thermostat is locally provided, the terminal block in the diagram may differ from the actual one.  The letter Y is the same as Y1-th.
4. When connecting the same brands indoor unit, it should be matches with a wire controller with fault signal detection, connect the thermostat to the to the terminal L of the indoor unit.  After any refrigerant leakage is detected, the terminal L outputs on AC 24 V fault signal to the wire controller, and then the wire controller displays the fault and give an alarm.
5. When electric auxiliary heating is selected, the thermostat needs to be connected to terminals W1 and W2 of the indoor unit, as shown by the dotted line in the wiring diagram.