Thermostat with OpenTherm and connect. for GSM

Intelligent thermostat PT55X with OpenTherm communications and connectivity options GSM module
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Description of product

Properties PT55X:

Digital thermostat for operation of heat sources with the OpenTherm communication. Suitable for cascade boiler rooms. Its great advantage is a possibility of extension of functions by connection of external modules of the MS1 fault signaling and the GSM module, GST1.

Advantages PT55X:

  • possibility to connect external modules (not part-PT55X can buy!)
  • option nine week programs for UT (with six temperature changes per day)
  • option one weekly program for TUV (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

Externí moduly:

1, GST1 module for controlling the thermostat by mobile phone

2, module failure alarm MS1 (if is error from boiler sent to the  thermostat then is switched to the sleep-contact MS1, which may be connected to other visual or audio element)


PT55X 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
pt55x.pdf 1.02 MB Download
pt55x_en.pdf 1.1 MB Download
PT55gst_v1001.pdf 1.67 MB Download

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