Room thermostat, AC 24 V, for fan coil units (3-speed or ECM fan), universal applications and heat pump applications. 7-day time switch. Outputs DC 0..10V or ON/OFF

Stock no. S55770-T343

Stock no. S55770-T343

  • Operating modes: Auto timer, Comfort, Energy Saving and Protection

  • Auto Timer mode with 8 programmable timers

  • 2-position or DC 0...10V control outputs

  • ECM fan or 3-speed fan outputs

  • Automatic or manual fan speed

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

  • Automatic or manual heating / cooling changeover

  • Adjustable commissioning and control parameters

  • Minimum and maximum setpoint limitation

  • Infrared remote control receiver

  • Backlit display

  • Auto timer can be disabled

Application selectable:

  • 2-pipe system

  • 2-pipe system with electrical heater

  • 2-pipe system and radiator / floor heating

  • 4-pipe system

  • 2-stage heating or cooling system



Operating voltage

AC 24 V


50/60 Hz

Power consumption

2 VA / 1 W

Positioning signal

DC 0...10, 2-position V

Operating range

AC 24 V

Control algorithm

P / PI

Ambient temperature, operation

0...50 °C

Setpoint setting range

5…40 °C

Measuring range, temperature

0…49 °C

Switching differential

Heating: 0.5…6 K
Cooling: 0.5…6 K

Analog inputs

External room / return air temperature, Heat / Cool changeover, Window contact on/off, Presence detector, Dewpoint monitor, Electrical heater enabled, Supply air temperature sensor

Analog inputs, number


Analog input, signal

NTC 3k , Switch

Analog outputs

Valve, el. heater: 2, Fan: 1 (ECM)

Analog outputs, number


Analog output, signal

DC 0...10 V

Analog output, current

Valve, el. heater: Max. ±1, Fan: Max. ±5 mA

Digital inputs, number


Relay outputs

Fan: 1- or 3- speed, Valve: N.O. contacts, El. heater and external equipment: N.O. contacts

Relay outputs, number


Relay output, switching voltage

AC 24…230 V

Relay output, switching current

5 (4) A

Mounting position

Wall mounting


Wall mounting with screws

Type of fixing

Wall mounting with screws

Degree of protection


Dimensions (W x H x D)

93 x 128 x 30.8 mm