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1) "Hvac" -- As to hvac thermostats HVAC Function: abbreviation heating, ventilating, and air-conditioning; heating, ventilation, and air-conditioning Pronunciation Symbols ..."
2) "Thermostats" -- As to hvac thermostats 1ther·mo·stat Pronunciation: 'th&r-m&-"stat Function: noun : an automatic device for regulating temperature (as by controlling the supply of gas or electricity to a heating apparatus); also : a similar device for actuating fire alarms or for controlling automatic sprinklers - ther·mo·stat·ic /"th&r-m&-'sta-tik/ adjective - ther·mo·stat·i·cal·ly /-ti-k(&-)lE/ adverb Pronunciation Symbols Bi-metallic thermostat for buildings A thermostat is a device for regulating the temperature of a system so that the system's temperature is maintained near a desired setpoint temperature. The thermostat does this by controlling the flow of heat energy into or out of the system. That is, the thermostat switches heating or cooling devices on or off as needed to maintain the correct temperature. Thermostats can be constructed in many ways and may use a variety of sensors to measure the temperature. The output of the sensor then controls the heating or cooling apparatus. Common sensors include: - Bi-metal mechanical sensors
- Expanding wax pellets
- Electronic thermistors
- Electrical thermocouples
These may then control the heating or cooling apparatus using: - Direct mechanical control
- Electrical signals
- Pneumatic signals
- 1 History and Development
- 2 Mechanical
- 2.1 Bi-metal
- 2.2 Wax pellet
- 3 Electrical
- 3.1 Simple two wire thermostats
- 3.1.1 Millivolt thermostats
- 3.1.2 24 volt thermostats
- 3.1.3 Line voltage thermostats
- 3.2 Combination heating/cooling regulation
- 3.3 Heat Pump Regulation
- 3.4 Digital
- 3.5 Chronothermostat
- 3.6 Thermostat’s phone interface
- 3.7 Household thermostat location
- 3.8 Thermostat Terminal Codes
- 3.9 See also
- 3.10 External links
| The thermostat was invented in 1885 by Albert Butz and is the first known example of process control methodology. This invention was the genesis for what is now Honey..."
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