When it comes to heating, ventilation, and air conditioning (HVAC) systems, the term 'common' refers to a low-voltage cable that carries continuous power from the system to the thermostat. This type of cable is also known as a C-cable. In today's electrical market, most newer HVAC systems are equipped with C-cables, which ensures compatibility for the installation of all smart thermostats. For instance, if you have a 110 V plug in the wall just below your Nest thermostat, you can connect a 24 V transformer to provide your Nest with the common 24 V power it needs. The C-cable is an essential component of any HVAC system as it provides the necessary power for the thermostat to function properly.
Without it, the thermostat would not be able to control the temperature in your home. Additionally, C-cables are also used to connect other components of the HVAC system such as humidifiers and air purifiers. When installing a new HVAC system or replacing an existing one, it is important to make sure that the C-cable is properly connected. If not, it could lead to problems such as inaccurate temperature readings or even damage to the system. It is also important to note that some older HVAC systems may not be compatible with C-cables and may require an adapter or other type of wiring. In conclusion, when it comes to HVAC systems, 'common' refers to a low-voltage cable that carries continuous power from the system to the thermostat.
This type of cable is also known as a C-cable and is essential for proper functioning of the system. It is important to make sure that this cable is properly connected when installing or replacing an HVAC system.
