Monitoring And Limiting Functions - Siemens RDG20 KN Series Basic Documentation

4
Functions
Additional functions
Notes
Output heating/cooling
sequence
Humidity control
Note

4.6.4 Monitoring and limiting functions

Floor temperature
limitation function
(P252)
Recommended values
for P252
54 | 186
To enable the function, set the related output parameter:
●
To energize the output during heating/cooling demand, set the parameter to 2.
●
To energize the output during heating demand, set the parameter to 3.
●
To energize the output during cooling demand, set the parameter to 4.
For application examples, see Relay functions [➙ 170].
●
During heating demand, the relay contact remains Off only with electric heater
or radiator (output signal on Y2/Y20 > 0 V).
● If the purge function (P251) is active (1...5 minutes every 2 hours), the relay
contact turns on to run the external equipment, e.g., a water pump.
This function switches the relay output on or off depending on the sequence, either
heating or cooling. The output can be used to release a heat pump compressor, a
reversing valve or 6-port ball valve as changeover.
To enable the function, set the related output parameter:
●
To close the contact when the thermostat is in heating mode (even in the dead
zone), set the parameter to 5.
●
To close the contact when the thermostat is in cooling mode (even in the dead
zone), set the parameter to 6.
For application examples, see Relay functions [➙ 170].
To reduce wear and tear on HVAC equipment, the minimum output On/Off time of
the Qx relay output can be adjusted (1...20 minutes) via P212 and P213. The
factory setting is 1 minute.
Depending on room humidity and the humidity setpoint, the humidity control
function switches the relay outputs to control the external equipment, e.g.,
dehumidifier/humidifier. See Humidity control [➙ 167].
To enable the function, set the related output parameter:
●
To control the dehumidifier, set the parameter to 7
●
To control the humidifier, set the parameter to 8
To reduce wear and tear on the HVAC equipment, the minimum output On/Off time
of the Qx relay output can be adjusted (1...20 minutes) via P212 and P213. The
factory setting is 1 minute.
When the operating mode is changed from Comfort to Protection, the relay contact
remains energized until the end of the minimum on time set via P212.
The floor temperature should be limited for two reasons: Comfort and protection of
the floor.
The floor temperature sensor, connected to multifunctional input X1, X2 or U1
(RDG2..KN)/X3 (RDG2..T), acquires the floor temperature. If the temperature
exceeds the parameterized limit (P252), the heating valve is fully closed until the
floor temperature drops to a level 2 K below the parameterized limit. The factory
setting of P252 is 28 ℃.
Input X1, X2 or U1/X3 must be commissioned accordingly (P150, P153, P155 =
11) and the type of sensor need to be selected (P151, P154, P156 = 2 (NTC 3K) or
3 (LG-Ni1000)).
See Multifunctional input, digital input [➙ 115].
●
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.
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