Overview of control outputs

Different control output signals are available and defined during commissioning (see below).

Control output

On/Off 2-wire

3-position

DC 0…10 V

On/Off 3-wire

Product No.

RDF400.., RDF460..

Y1, Y2
(2 x NO *)

Y1, Y2
(1 x /)

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Y1, Y2
(1 x /)

RDF440..

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Y10, Y20

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Notes

*) NO: Normally open

On/Off control signal
(2-wire)

The valve receives the On command via control output Y1, if:

  1. The acquired room temperature is below the setpoint (for heating) or above the setpoint (for cooling).

The valve receives the Off command via control output Y1, if:

  1. The acquired room temperature is above the setpoint (for heating) or below the setpoint (for cooling).

Note

On/Off control signal
(3-wire)

The valve receives the On command via control output Y1, if:

  1. The acquired room temperature is below the setpoint (for heating) or above the setpoint (for cooling).

The valve receives the Off command via control output Y2, if:

  1. The acquired room temperature is above the setpoint (for heating) or below the setpoint (for cooling).

Note

Electric heater control signal (On/Off)

The electric heater receives an On command via the auxiliary heating control output, if

  1. The acquired room temperature is below the "Setpoint for electric heater",

Note

  • The electric heater is switched off for at least 1 minute.

The Off command for the electric heater is output, if

  1. The acquired room temperature is above the setpoint (electric heater),

Note

  • The electric heater is switched on for at least 1 minute.

 

CAUTION! A safety limit thermostat (to prevent overtemperature) must be provided externally.

3-position
control signal
(RDF400.., RDF460..)

Heating: Output Y1 provides the Open command, and Y2 the Close command to the 3-position actuator. Cooling: Same with Y1 and Y2.

The factory setting for the actuator run time is 150 seconds. It can be adjusted via P46.

The parameter is displayed only, if 3-position is selected via P04.

Synchronization

  1. When the thermostat is powered up, a close command for the actuator run time by + 150 % is issued to ensure the actuator closes fully and synchronizes to the control algorithm.
  2. When the thermostat calculates the positions "fully close" or "fully open", the actuator run time is extended by + 150 % to ensure the correct actuator position is synchronized to the control algorithm.
  3. After the actuator reaches the position calculated by the thermostat, a waiting time of 30 seconds is applied to stabilize the outputs.

DC 0...10 V control

This function is available with RDF440.. only.

DC 0...10 V
for valve actuators

The demand calculated by PI control from the current room temperature and setpoint is provided via Y10, Y20 to the valve actuator as a continuous DC 0...10 V signal.

Note