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
Copper Tube Bending Tools and Methods
There are four methods for bending soft copper tubing. Copper tubing can be bent to the correct measurement using a lever type bending tool, a ratcheting type tubing b...
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Pressure Testing Gas Lines for Leaks! Natural Gas and Propane (LP)
Fuel gases such as Propane or Natural Gas are a regular part of everyday life for many. Whether it is used to heat a home, cook a meal, or to warm our water, these fue...
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6 Reasons Why a Furnace Blower Fan Motor Won’t Shut Off!
On a natural gas or propane furnace, there are typically 6 main reasons why a blower fan motor may not shut off and just continues to run. Before turning the power off...
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Fridge or Freezer Compressor Not Starting? Test Start Relay, Overload, Capacitor, PTC Thermistor
This article explains how to troubleshoot a refrigerator or freezer compressor that does not start. There are different components that can be tested to find out what ...
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Testing if an HVACR Compressor is Shorted to Ground, Open, or the Thermal Overload is Tripped!
In this HVAC Training Article, I discuss how to perform electrical troubleshooting on an HVAC/R compressor to determine if it is bad. Too many times, compressors are c...
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Troubleshooting a Cad Cell Flame Detector for an Oil Burner!
A Cad (Cadmium Sulfide) Cell is a photo conductive flame detector that changes its electrical resistance depending on how much light is available at the sensor. This i...
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