24V Thermostat Wiring Diagrams

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Course overview
  • Author: AC Service Tech
  • Level: Beginner
  • Study time: 40 minutes
  • Video time: 20 minutes
  • Knowledge Checks: 9
Course overview

This course covers the most common 24V thermostat wiring diagrams used to wire and control gas furnaces, air handlers, air conditioners, heat pumps, auxiliary heat, and emergency backup heat.

O and B terminals are discussed for reversing valves of different manufacturers. Thermostat terminal connections are shown for each thermostat mode along with the 24V circuit path being powered.

"Understanding thermostat wiring diagrams and connection points allows the technician to both install and troubleshoot effectively, based on the system type."
-Craig
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