Page 53 - Advanced Course
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KNX ADVANCED COURSE
Room thermostats sometimes have extensive parameters: they can for instance be set as
2-step or continuous controllers.
Figure 26: Controlled systems for 2-step and continuous controller
2-step heating is frequently used in connection with underfloor heating. Underfloor heating
is a very slow system. It takes a long time to heat up a room (up to several hours). To
shorten the warming-up phase, a rapid heating system (e.g. hot water convector heating)
is used in addition.
Figure 27: Controlled system for 2-step heating
The cooling function has a second operating mode. It is used in connection with the
heating to achieve a constant room temperature. When using the cooling mode, the
occurrence of condensed water on the cooling surfaces (dew point) should be noted.
Home and Building Management Systems KNX Association
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