instructions on how to upgrade the Imax Xtra 2 in order to use an outside temperature sensor to automatically control the boiler water temperature. The warmer the outside air, the lower the set boiler temperature. To condense, a return temperature of 55°C or lower is required. Therefore, with an outside air temperature sensor fitted the boilers run more efficiently in condensing mode. Once the sensor is fitted it is automatically detected. The sensor operation may be configured by adjustment of the boiler operating parameters, if necessary. This is done using the Outside Sensor Kit. Brand new opened for pictures
