Info Sheet Dew Point Monitoring
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DEW POINT MONITORING UNDERSTANDING, PLANNING and CONFIGURING - and thus avoiding condensation The dew point temperature is that temperature at which condensation develops on a surface. For example: At an air temperature of 24.0°C and at 60% relative humidity, the dew point is at a temperature of 15.8°C. If there is a surface in this room that is 15.8°C or colder, water droplets will develop on it. The objective of dew point monitoring is to avoid this. In buildings, condensation, sometimes also referred to as „dew water", occurs particularly on cooled pipes and surfaces of air conditioning systems. The moisture of the warm room air can settle here if surface and dew point temperatures approach similar values. Thanks to the monitoring process, the building automation system can implement timely measures in order to avoid droplet formation. For example, the temperature of the coolant may be raised (reduction of air conditioning), the room temperature may be raised, or the air humidity lowered (ventilation). DANGER OF CONDENSATION on the cold pipes of air conditioning systems! Consequence: Water collects on building elements and damages them, or droplets fall from the ceiling. TEMPERATURE SENSOR T-NTC • Measures the surface temperature of the cooling element • The sensor is connected to an input port of the room controller Cala KNX Example for dew point monitoring and air conditioning Cooling ceiling Window contacts Conventional wiring ROOM CONTROLLER CALA KNX TH or CALA KNX AQS/TH • Measures the room temperature and monitors the dew point • Automatically controls heating and cooling (on one or two levels) Practical functions for air conditioning (selected examples): • Actuating variable output optimised for standard or 4/6-way valve • Four inputs for temperature sensor, but also push buttons or window contacts • Window contacts may, for example, activate the frost/heat protection mode Comfort functions: • Show room and nominal temperature as well as current air conditioning mode • Manual adjustments of nominal temperature and mode, comfort extension • Touch switch for window, shades, light AIR CONDITIONING ACTUATOR KNX K4 • Controls the valves of the heating/cooling system elsner* elektronik Elsner Elektronik GmbH I Sohlengrund 16 I 75395 Ostelsheim Version 07.02.17 I Technical changes and errors excepted.

DEW POINT MONITORING SETTING UP – Example of Cala KNX room controller SETTING THE PARAMETERS IN THE ETS Cooling medium temperature monitoring of the Cala KNX Dew point monitoring can be set up with Cala KNX TH or Cala AQS/ TH. Both measure the room temperature and air humidity and may control heating and cooling systems. Cooling medium temperature monitoring is used for the dew point function. In the ETS application of the Cala KNX, Monitoring of the cooling medium temperature is activated in the menu Dew point measurement. Then, the menu within the Cooling medium temperature monitoring...