Field Notes
Plain-language notes on components, circuits and how to read a schematic, written for people at the bench, not for a classroom.
Field Notes
TOP 5 HVAC CONTACTOR Troubleshooting Problems!
This article explains the "Top 5 Problems" that can occur on a contactor and how to troubleshoot them! The HVAC Contactor is a device that turns on the outdoor unit co...
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Don't Get Locked Out! Locking Port Cap Quick Tip!
Just because your company only uses one type of port cap doesn’t mean you won’t be called to service a system with another manufacturer’s locking port cap. C&D Valve C...
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When Installing or Replacing an Air Conditioner, Use These Procedures for the Refrigerant Tubing!
When installing a new HVAC system, replacing an existing HVAC system, or only replacing one part of the system, there is a sequence of procedures that must be performe...
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HVAC Electrical Training Board For Wiring, Components, Wiring Diagrams, Troubleshooting
Downloadable Wiring Diagrams and the measurement layout are available at the bottom of this page. Instructors are always looking for a low cost, hands-on project, that...
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TXV Bulb Mounting Position and External Equalization!
The question we are looking to answer is, should we install the TXV bulb before (upstream) or after (downstream of) the external equalization port? The first thing to ...
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Adjusting the Airflow Speed on ECM Blower Fan Motors! (Variable & Multi-Speed Types)
In this HVAC training article, we will be discussing how to adjust the fan speeds on an indoor ECM variable speed blower motor and an ECM constant torque/multi-speed b...
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