Pro1 T755S Thermostat



   Up to 2 Heat 2 Cool Conventional
   Up to 3 heat 2 Cool Heat Pump 
   Battery or Hardwired
   7 Day, 5/1/1 or Non-Programmable 
   Compatible with Wired Remote Sensors





  • Universal 2H/2C Conventional or 3H/2C Heat Pump

  • Compatible with Indoor Remote Sensor (R251S) or Outdoor Remote Sensor (R250S)

  • Add Indoor Sensor(s) to move the System Sensing Point or Sense a System Average

  • 7 Day, 5/1/1 Programmable or Non-Programmable

  • Set Hardware Dual Duel Balance Point with Outdoor Remote Sensor (250S)

  • Tightly Control Hydronic Radient System with Slab Sensor (250S)



T805 Installation Manual T805 Operation Manual







T755S Thermostat
The display range of temperature 41°F to 95°F (5°C to 35°C)
The control range of temperature 44°F to 90°F (7°C to 32°C)

Load rating

1 amp per terminal, 1.5 amp maximum all terminals combined
Display accuracy ± 1 °F 
Swing (cycle rate or differential) Heating is adjustable from 0.2°F to 2.0°F 
Cooling is adjustable from 0.2
°F to 2.0°F 
Power source 18 to 30 VAC, NEC Class II, 50/60 Hz for hardwire (common wire) 
Battery power from 2 AA Alkaline Energizer batteries 
Operating ambient

32° to +105° (O° to + 41°C) 

Operating humidity

90% non-condensing maximum

Dimensions of thermostat

4.7"W x 4.4"H x 1.1"D






Pro1 R251S



The R251S provides a better level of comfort by averaging as many as 16 different sensing points. Additional indoor sensors increase the accuracy of the temperature reading throughout a home.

 Pro1 R250S


The R250S can be used as an outdoor temperature sensor to set a Dual Fuel Balance Point. This feature chooses the most efficient heat source based on the outside temperature. At this predetermined point the system will automatically choose the best heating source to save energy.

The R250S can also be used as a floor sensor in Radiant Heating applications. By sensing the temperature at the heat source, this accessory greatly improves the comfort of the space and the efficiency of the heating system.


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