EB 5573 EN
63
Functions of the heating circuit
6.3 Underfloor heating/drying of jointless floors
Using function block setting CO1, 2 > F05 - 1, the respective heating circuit is configured as
an underfloor heating circuit. In doing so, the controller at first only limits the value ranges of
the heating characteristic gradient and the maximum flow temperature in PA1, 2 parameter
levels:
−
Value range of the gradient: 0.2 to 1.0
−
Value range of the maximum flow temperature: 5 to 50 °C
In addition, it is possible to activate the
drying of jointless floors
function. In connection with
this, the function block parameters are listed which appear after activating this function
block. They determine the drying process: the first heating up phase starts at the entered
'Start temperature', which has a flow temperature of 25 °C in its default setting. The start
temperature is held constant for the days entered in 'Hold (days)'. Afterwards, this tempera-
ture is raised by the value entered in 'Temp. rise/day' within 24 hours, i.e. the default setting
causes the flow temperature set point to rise to 30 °C 24 hours after the holding phase. If the
'Maximum temperature' is reached, it is kept constant for the number of days entered in
'Max. temperature sustaining time'. The 'Temp. reduction/day' parameter determines the
temperature reduction downwards. If the 'Temp. reduction/day' is set to 0, the temperature
maintaining phase moves directly to automatic mode. If the function block parameter 'Start
temperature' is set to 25 °C and 'Temp. rise/day' to 0.0 °C, the drying functions runs as
specified in Part 4 of DIN EN 1264: the drying of jointless floors function starts with a flow
temperature of 25 °C, which is kept constant for three days. Afterwards, the controller
switches to the maximum adjusted temperature. The further process remains unchanged. The
drying of jointless floors function is activated by changing the default setting 'STOP' to
'START' (display:
STArT). The restarting phases 'START temperature build-up phase' (display:
STArT), 'START maximum temperature hold phase' (display:
STArT) and 'START tem-
perature reduction phase' (reading:
STArT) can be selected to continue an interrupted
drying process. The course of the drying process can be monitored in the operating level in
the reading of the flow temperature reading (
) of the associated heating circuit. For ex-
ample:
r
Maximum temperature hold phase
When the additional reading in the flow temperature reading disappears after the last
phase, this indicates that the drying process has been completed. Any power failure that
occurs while the function is running automatically restarts the drying function.
