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 power circuit. This circuit can be either single-phase or three-phase, and power the equipment which is doing the work of either heating, cooling or ventilating.

The second circuit we will focus on is the control circuit. This is the circuit which tells the power circuit when to engage. The control circuit will sometimes operate at an extra-low voltage 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 Copyright © 2021 by Aaron Lee is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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