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Flush-mount room thermostat with KNX communications, 2-/4-pipe fan coils or DX type equipment, four buttons for switching lights and blinds

Stock no. S55770-T105

Stock no. S55770-T105

Same functionality and technical data as RDF301 and:

  • Buttons for lighting systems and blinds



Operating voltage

AC 230 V


50/60 Hz

Power consumption

4 VA

Positioning signal

2-position, 3-position

Control algorithm

2-point / PI

Ambient temperature, operation

0...50 °C

Setpoint setting range

5...40 °C

Measuring range, temperature

0…49 °C

Switching differential

0.5…6 K


Bus: KNX (S-mode and LTE mode with Synco 700)

Analog inputs

External room / return air temperature, Heat / Cool changeover, Operation mode changeover, Window contact on/off, Dewpoint monitor, Electrical heater enabled, Monitor input, Fault input

Analog inputs, number


Analog input, signal

NTC 3k , Switch

Relay outputs

Fan: N.O. contacts, non-floating, Valve: N.O. contacts, non-floating

Relay outputs, number


Relay output, switching voltage

AC 230 V

Relay output, switching current

5 (2) A


Flush-mounting with recessed rectangular conduit box
Fixing center 60.3 mm (BS4662)

Type of fixing

Recessed rectangular conduit box BS4662 with fixing centres of 60.3 mm (ARG71)

Degree of protection


Dimensions (W x H x D)

86 x 86 x 57 mm