HVAC: What Is A Thermostat & How Does A Thermostat Work (Thermostats Explained) Thermostat Wiring

HVAC: What Is A Thermostat & How Does A Thermostat Work (Thermostats Explained) Thermostat Wiring/Heating/Cooling
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A thermostat is a regulating device component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint.

Thermostats are used in any device or system that heats or cools to a setpoint temperature, examples include building heating, central heating, air conditioners, HVAC systems, water heaters, as well as kitchen equipment including ovens and refrigerators and medical and scientific incubators. In scientific literature, these devices are often broadly classified as thermostatically controlled loads (TCLs). Thermostatically controlled loads comprise roughly 50% of the overall electricity demand in the United States.

Digital thermostats use a simple device called a thermistor to measure temperature. This is a resistor which allows electrical resistance changes with temperature. The microcontroller in a digital thermostat can measure the resistance and convert that number to an actual temperature reading.

A digital thermostat can do a few things that a regular mechanical thermostat cannot. One of the most useful features of a digital thermostat is programmable settings. In the winter, you can program it to automatically turn up the heat for an hour or two in the morning while you get ready for work, turn down the heat until you get home, turn up the heat in the evening and then turn down the heat while you sleep. This is a great money-saving feature because you can simply turn down the heat when it isn't needed.

[jeremyruutel]

Excellent job Jumper, man, easy to understand and well paced! Keep up the great work looking forward to exploring your other videos.

[izzybell]

Excellent presentation and well explained. Interesting subject. Great job JMT

[MrGarcon]

thanks for the good lesson here, ,,i am 70 retired but its always good to review, ,,,god bless go you have a heat pump thermostat ? lots of techs have issues with those ! thanks

[DS-bifz]

I think there is a much easier way to present this: The red line carries 24vac; the job of the thermostat is to connect the red wire on R/Rc to either the "G" for manual fan/no compressor selection, or to " Y" for automatic operation of the fan and the compressor per the temperature setting. That is it!

The common wire is not even needed and might not even be present for thermostats that are fully battery operated. Often, the common is already constantly connected to the fan relay ELSEWHERE and to the AC Compressor+Fan ELSEWHERE. You don't need a common wire at the thermostat unless your thermostat isn't battery operated and itself needs both legs of the 24 volts to function.

The only tricky part is that the AC installer may not have used a cable having a yellow individual lead color, so behind your thermostat you might find only red, blue, green. Usually, red=red, green=green, and blue takes the place of the missing yellow color for Y. This is why thermostat manufacturers tell you to note how a previous thermostat was wired/which wire color went to each of the standard LETTERS before you remove it to replace it.

[realfifty]

What part of the thermostat reads the temperature in your house?

[SunofYork]

But what powers the thermostat controller program itself ? Is it the batteries, or does it draw 24 volts ac from the mains transformer ? ie are the batteries only to hold the settings during a mains power outage ?

[nicolerennie]

great, clear & thorough explanation 👌🏼TY JMT!

[MarioDallaRiva]

Ah, puberty kicking in by the sound of your voice 🤙🏼😎

Or maybe a good time the night before 🍻

[muhammadnaeem]

Excellent, thanks I am Muhammad Naeem Pakistan

[joprilsubano]

Hello sir please can I ask the schematic diagram, of your HVAC presentation example Thank you