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Siemens RDU340… Basic Documentation CE1P3078en

Building Technologies Functions 2014-09-05

The output signal of the air flow (DC 0..10V) can be limited to a minimum value by

using parameter P63 and to a maximum value using parameter P64. These air flow

limitation values can be set between 0% and 100%.

This is used to ensure a minimum or maximum supply air volume.

max

min

Changeover

XpH

Y10

100%

TR [°C]

XpC

Vmin

Vmax

T Room temperature

Y10 Control output

W Room temperature setpoint

XpH Proportional band Heating

XpC Proportional band Cooling

Vmin Minimum limitation air flow

Vmax Maximum limitation air flow

The output signals DC 0…10V can be inverted by means of DIP switch #2.

– If DIP switch #2 is set to “OFF”, 0V corresponds to 0% travel and 10V to 100%

(factory settting).

– In position ON, 0V corresponds to 100% travel and 10V to 0% travel.

This function is useful in conjunction with normally open valves.

The floor temperature should be limited for 2 reasons: Comfort and protection of

the floor.

The floor temperature sensor, connected to multifunctional input X1, acquires the

floor temperature. If the floor temperature exceeds the parameterized limit

(parameter P51), the heating valve is fully closed until the floor temperature drops

to a level 2 K below the parameterized limit.

This function is factory-set to OFF (disabled).

Input X1 or X2 must be commissioned accordingly (P38 = 1).

See section 4.8“Multifunctional input”.

Living rooms:

Up to 26 °C for long-time presence, up to 28 °C for short-time presence.

Bath rooms:

Up to 28 °C for long-time presence, up to 30 °C for short-time presence.

The table below shows the relation 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.

limit. 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

Min / Max air flow

Output signal inversion

Floor temperature

limitation function

Recommended values

for P51:

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 31 32

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