The thermostat is an important component for any heating and cooling system, as it communicates the HVAC equipment’s operating instructions to maintain comfortable room temperatures. While there’re lots of different thermostat models on the market, but we can distinguish to only a few types of thermostats.    THE DIFFERENT TYPES OF THERMOSTATS Differentiating the types of thermostats is done by looking at the various functions and features they provide. In general,there are two different types of thermostats: line-voltage thermostats and low-voltage thermostats. Each of these thermostat types works with certain types of heating systems and they differ based on the voltage they use to operate.   Line-voltage thermostats(110-230VAC): Line-voltage thermostats are most often used to control electric resistance heating equipment. Typically, they are paired with electric baseboard heaters, underfloor heating matts, in-wall heaters, radiant heaters, and other heating units.   The line-voltage thermostat gets its name fromeither 120 volts or 240 volts. This type of thermostat essentially acts as a switch that supplies the heater with power, as electrical current flows through the unit.   Low-voltage thermostats: Low-voltage thermostats are used with central forced air heating systems such as furnaces and heat pumps, as well as central boiler heating systems. Because electrical resistance is not used to create heat in these systems, much less voltage is required versus a line-voltage thermostat. A low-voltage thermostat requires around 24 volts to run, or with alkaline battery e.g. AA*2 or AAA*2 ,which is ideal for powering system equipment like boiler, pumps, and fans which has their own power. Low-voltage thermostats do not run on the heating system’s circuit – the thermostat communicates with the heater through low-voltage signals to control operation rather than sending power to the heater to operate it.  

This room thermostat is only used in heating systems to maintain the selected room temperature. If the room temperature falls below the selected setpoint, the heating contact will open. If the room temperature exceeds the selected setpoint, the heating contact will close. Temperature control is based on internal sensor. An external sensor (SENSOR 10K ) can be connected without any additional external power supply. Compatibles with both NC and NO actuators, such as Gas boiler or oil buners Mounting, Installation and Commissioning The room thermostat should be located where the air temperature can be sensed as  accurately as possible, without getting adversely affected by direct solar radiation or other heat or refrigeration sources. Mounting height is about 1.5 m above the floor. The unit can be fitted to most commercially available recessed conduit boxes or directly on the wall. Only authorized personnel may open the unit to perform service. The unit must be isolated from the mains supply before opening. When installing the unit, first remove the cover of room thermostat, and then fix the thermostat body to wall. Then make the calibration as below. Use a sensible thermometer with this thermostat, in some atmosphere and be sure about the real temperature of room. Then remove plastic round cover of set point. For example, the room temperature is 20 °C indicated on sensible thermometer. You must turn set point till you hear click voice. Then put the set point cover by matching 20 °C with arrow on cover of room thermostat. The thermostat must be mounted on a flat wall. The local electrical regulations must be complied with. If there are thermostatic radiator valves in the reference room, set them to their fully open position. The diaphragm is filled with environmentally friendly gas. The thermostat housing is made of plastic.