Overview - Basic Documentation - RDF600KN - RDF600KN/S - RDF600KN/VB

Semi-flush mount room thermostats with KNX communications RDF301, RDF301.50, RDF301.50H, RDF600KN, RDF600KN/VB, RDF600KN/S
Product Family
Desigo Open
Desigo PX Open
Product Group
Thermostats (temperature controller with sensor)
Building automation
Content Language
English
Content Type
Technical Documentation > Basic Documentation
Product Version
Status
Valid
Date
2020-02-21
Document No
CE1P3171en
Download ID
A6V10385333
Stock No.
S55770-T293
S55770-T400
S55770-T430
Product No.
RDF600KN
RDF600KN/S
RDF600KN/VB
Access level
Internet
File Type
html

Overview of control outputs

Different control output signals are available. They need to be defined during commissioning (see below).

Control output
Product no. 2-position
 2-position
PWM		 3-position DC 0…10 V

RDF301,

RDF301.50,

RDF301.50H,

RDF600KN, RDF600KN/VB, RDF600KN/S

 Y11, Y21
(2 x SPST)		 --- Y11, Y21 *)
(1 x / )		 ---

*) Only on 2-pipe application

Note:

In the ACS tool, Y11 and Y21 are called Y1 and Y2.

ON/OFF control signal (2-position)

The valve or compressor receives the OPEN/ON command via control output Y11 or Y21 when…

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

  2. the control outputs have been inactive for more than the "Minimum output OFF-time" (factory setting 1 minute, adjustable via parameter P48).

OFF command when…

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

  2. the valve has been active for more than the "Minimum output on-time" (factory setting 1 minute, adjustable via parameter P49).

Electric heater control signal
(2-position)

The electric heater receives an ON command via the auxiliary heating control output (Y…, see Mounting Instructions) when…

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

  2. the electric heater has been switched off for at least 1 minute.

The OFF command for the electric heater is output when…

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

  2. the electric heater has been switched on for at least 1 minute.

Caution

A safety limit thermostat (to prevent overtemperatures) must be provided externally.

Adaptive temperature compensation for electric heater (RDF600KN, RDF600KN/VB)

When an electric heater is connected directly to the ON/OFF Y21, the current causes the relay contact to heat up. This falsifies the reading of the internal temperature sensor. The thermostat compensates the temperature if the rated current/power of the electric heating is entered in the parameters.

P45 (load current el. Heater): Factory setting 0kW, setting range: 0.0…1.2 kW.

3-position
control signal

Output Y11 provides the OPEN command, and Y21 the CLOSE command to the
3-position actuator.
The factory setting for the actuator's running time is 150 seconds. It can be adjusted via parameter P44.
The parameter is only visible if 3-position is selected via DIP switches.

Synchronization

  1. When the thermostat is powered up, a closing command for the actuator running time + 150% is provided to ensure that the actuator fully closes and synchronizes to the control algorithm.

  2. When the thermostat calculates the positions "fully close" or "fully open", the actuator's running time is extended + 150% to ensure the right 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.