Electrical Terms and Definitions

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When discussing HVAC controls, there are two main circuits that we focus on. The first being the . This circuit can be either or , and power the equipment which is doing the work of either heating, cooling or ventilating.

The second circuit we will focus on is the . This is the circuit which tells the when to engage. The control circuit will sometimes operate at an value of 24 volts relative to the power circuit, which usually operates at a line voltage value of 240 volts or more.


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Basic HVAC by Aaron Lee is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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