Thermostat with OpenTherm

Intelligent thermostat PT55 with OpenTherm communications
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Description of product

Properties PT55:

Digital thermostat for operation of heat sources with the OpenTherm communication (= system
of data communication between the boiler and thermostat).

Advantages PT55:

  • option nine week programs for CH (with six temperature changes per day)
  • option one weekly program for DHW (with three time intervals per day)
  • equithermal control
  • equithermal control with correction according to the internal temperature
  • constant of the building influence
  • PI control
  • premature activation of the heating (PZT)
  • possibility of connection of an external sensor (CT01-10k C/S/P)
  • summer mode
  • choice even/odd week
  • simple to controlling and programming


PT55 can be used for the boiler according to the protocol OpenTherm communicating and meeting the technical specifications. 


Power supply directly across the line OT

Communication line



twin-lead for OpenTherm

without the polarity

to 50 m

Min. prog. time for CH 10 min.
Min. prog. time for DHW 1 hour
Temp. setting range +2°C to +39°C
Temp. setting range of CH water +5°C to +80°C
Temp. setting range of DHW +30°C to +65°C
Min. indicating jump 0,1°C
DHW hysteresis 5°C
Measurement accuracy ±0,5°C
Protection IP20
Working temperature 0°C to +40°C

Technical specification

Power supply universal directly over the line OT
Thermostat type wire with OT communication
Type of control OTC/PI control
Accuracy 0,5 °C
Dimensions (LxWxD) 80x130x20 mm
Protection IP20
Working temperature 0 °C to 40 °C
Switching element -
Output OpenTherm
Temperature changes per day 6
Range of adjustable temperature 5 °C to 80 °C
Temperature setting by 0, 5 °C
Min. programming time 10 min
Min. indication step 0, 1 °C
Communication type bidirectional OpenTherm Plus (pair max.50 m, without polarity)
Min. Programming time for DHW 60 min
Temp. setting range of DHW 30 °C to 65 °C
DHW hysteresis 5, 0 °C

Downloads files

File name Size
pt55.pdf 1.07 MB Download
pt_size.jpg 68.11 kB Download

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