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The specifications are:Receiver1 Relay output for compressor1 Relay output for inverter valve or heat resistor.2 Relay outputs for high and low fan on the indoor unit.1 Room temperature sensor1 Gas temperature sensor for determinig failure on the system or frozen .Failure and function indicator leds The system has to have memory if there is a power failure, when the power returns, the indoor unit has to be at the same conditions before it was the failure. The board has to have a switch to choose between pump or heating resistance.Power: 220VAC 50HzThe main board, the led board and IR receiver has to be wired by 0, 5m of wire. Transmitter Liquid Quartz Display with:Low/High FanCoolingHeatingTemperature (2 digits). Buttons:FanFunction ( Fan, Cooling, Heating)Temperature Setpoint Power on/off . hvac, remote, split HVAC remote controllers