RT310i Installation Manual 113. Before you start3.1 LCD icons3.2 Button functionsHeating Mode OnCooling Mode OnON when thermostat is connectedto the ITG310 gatewayFrost Protection OnSchedule Mode OnManual Override(Permanent/Temporary override)ON when battery is weakbefore battery life endON during RF signaltransmission to RX boilerHoliday Mode OnTemperature displayKey FunctionTurn on the LCD backlightTurn On/Off the Frost ModePress to increase setpoint temperature, press and holdto enter fast advance.Press to decrease setpoint temperature, press and holdto enter fast advance.1. Press once to enter/exit in RF Test Mode2. Hold for 3 seconds to enter/exit Pairing ModeThere are few user controls for the RT310i, making this thermostat very easy to operate. These controls areshown below, along with a description of each of their functions. The temperature displayed on the LCD is thecurrent room temperature. All the buttons on the thermostat and receiver with a description are shown below.Thermostat