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Semi Flush-mount room thermostat for rectangular conduit box with KNX communications, for VAV application

Stock no. S55770-T106

Stock no. S55770-T106

Semi Flush-mount room thermostat for VAV application

  • KNX communications

  • Output for a DC 0…10 V actuator and AC 230V electrical heater (ON-OFF)

  • 2 multifunctional inputs for keycard contact, external room / return air temperature (QAH11.1, QAA32), heat / cool changeover, operation mode changeover, window contact on/off, dewpoint monitor, electrical heater enabled, fault contact

  • Operating modes: Comfort, Economy and Protection

  • Modulating PI control

  • Control depending on the room or the return air temperature

  • Automatic or manual heating/cooling changeover

  • Adjustable commissioning and control parameters

  • Minimum and maximum setpoint limitation

  • Adjustable minimum and maximum limitation for air flow signal DC 0...10V

  • Output signal inversion as an option

Application selectable:

  • Single-duct system

  • Single-duct system with electrical heater

Additional info

The matching ARG71 flush-mounting box must be ordered separately. See chapter Display and Operation untis - Room Temperature Controller.



Operating voltage

AC 24 V


50/60 Hz

Power consumption

4 VA

Positioning signal

DC 0...10 V

Control algorithm

PI / P

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

Analog inputs, number


Analog input, signal

NTC 3k , Switch

Analog outputs

VAV actuator

Analog outputs, number


Analog output, signal

DC 0...10 V

Analog output, current

Max. ±1 mA

Relay outputs

N.O. contact, potential-free

Relay outputs, number


Relay output, switching voltage

AC 230 V

Relay output, switching current

Max. 5 (2) A

Type of fixing

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

Degree of protection


Dimensions (W x H x D)

86 x 86 x 57 mm