Outside temperature sensor CT4-R type is used for ecoMAX850 automation. It allows you to monitor the outside air temperature, according to which the automation adjusts the algorithms and the temperature of the coolant, maintaining comfortable conditions in the room. Waterproof design. Install in shady areas on the north or north-east side of the facility, avoiding direct sunlight. The sensor should measure the natural air temperature without reacting to sunlight or heat flows rising along the wall (broadcasting on the sunny side but in the shade under the visor is a gross violation).