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
Adjusting the Furnace/AC Airflow Speed on a 120v PSC Blower Motor!
In this HVAC training article, we will be discussing how to adjust the fan speeds on an indoor PSC blower motor in furnace and air conditioning units. PSC stands for P...
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Top 10 Gas Water Heater Pilot Light Problems! When It Won’t Stay Lit!
This article explains how the thermocouple, gas valve solenoid, and pilot flame work on a water heater. I will be discussing 10 problems that may occur that causes the...
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How to Find Common, Start, and Run on a PSC Compressor Motor!
In this HVACR Training article, we are using electrical resistance measurements on the PSC compressor terminals in order to determine which tab is Common, Start, and R...
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Gas Furnace Electrical Safety Switch Testing!
In this article, we will be discussing methods to test the safety switches in a gas furnace using a multimeter. These switches include the flame rollout switch, therma...
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20 Causes of Low Indoor Airflow on Ducted HVAC Units!
In this HVAC training article, I discuss 20 AIRFLOW Problems that you may find on ducted gas furnaces, air conditioners, heat pumps, air handlers, and packaged units. ...
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Finding a Low Voltage Short Quickly, Step by Step!
In the world of HVAC, low voltage shorts are a common occurrence on a service call. Low voltage shorts occur when an electrical circuit finds a shortcut to the ground ...
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