Basic Documentation

Functions
Additional functions
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4.5.4 Monitoring and limitation functions
The floor temperature should be limited for two reasons: Comfort and protection of
the floor.
The floor temperature sensor, connected to multifunctional input B1/X1 or S1/X2,
acquires the floor temperature. If the temperature exceeds the parameterized limit
(P51), the heating valve is fully closed until the floor temperature drops below the
parameterized limit. This function is factory-set to Off (disabled).
Input B1/X1 or S1/X2 must be commissioned accordingly (P38/P40 = 1).
See Multifunctional input, digital input [➙ 43].
● Living rooms:
Up to 26 °C for extended presence, up to 28 °C for short presence.
● Bathrooms:
Up to 28 °C for extended presence, up to 30 °C for short presence.
The table below shows the relationship between parameter, temperature source
and temperature display.
Parameter
P51
External temp.
sensor
available
Source for display of
room temperature
Output control according to
Floor temp.
limitation
function
OFF
No
Built-in sensor
Built-in sensor
Not active
OFF
Yes
External temp. sensor
External temp. sensor
Not active
10...50 ˚C
No
Built-in sensor
Built-in sensor
Not active
10...50 ˚C
Yes
Built-in sensor
Built-in sensor + limit by external
sensor
Active
The "Floor temperature limitation" function influences the outputs listed in the table
below:
Application
Output Y1
Output Y2
“Floor temp. limit” function impacts on
Remark
Heating
(P01 = 0/2/3)
Cooling
P01 = 1/2/3
Heating and
cooling
(P01 = 4)
2-pipe
H/C valve
Y1
N/A
2-pipe with electric
heater
(RDF660MB only)
H/C valve
Electric
heater
Y2
Y2
*)
Only electric
heater
4-pipe
Heating
valve
Cooling
valve
Y1
N/A
Y1
*) If P13 = ON, electric heater is in cooling mode.
Either a floor temperature sensor or an external room temperature sensor can be
used.
Dewpoint monitoring is essential to prevent condensation on the chilled ceiling
(cooling with fan disabled, parameter P52). It helps avoid associated damage to
the building.
A Dewpoint sensor with a potential-free contact is connected to multifunctional
input X1 or X2 (P38/P40 = 4). If there is condensation, the cooling valve is fully
closed until no more condensation is detected, and the cooling output is disabled
temporarily.
If the fan function is enabled (P52 ≠ 0), the fan continues to work as long as the
dewpoint function is active.
The condensation symbol is displayed during temporary override and fault
"Condensation in room" is sent via Modbus.
The input must be commissioned accordingly (P38, P40).
See Multifunctional input, digital input [➙ 43].
Dewpoint monitoring
(RDF660MB only)
Fault state
Fault information (P38,
P40)
Floor temperature
limitation function (P51)
Recommended values
for P51
Note