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
When Installing or Replacing an Air Conditioner, Use These Procedures for the Refrigerant Tubing!
The refrigerant tubing procedures to follow on an air conditioner installation or changeout.
Read more →
Don't Get Locked Out! Locking Port Cap Quick Tip!
A quick tip on locking refrigerant port caps.
Read more →
TOP 5 HVAC CONTACTOR Troubleshooting Problems!
The five contactor faults that come up most often, and how to confirm each one.
Read more →
Troubleshooting a Cad Cell Flame Detector for an Oil Burner!
How the cad cell works on an oil burner and how to troubleshoot it.
Read more →
Testing if an HVACR Compressor is Shorted to Ground, Open, or the Thermal Overload is Tripped!
How to tell a compressor that is shorted to ground from one that is open or simply on thermal overload.
Read more →
Fridge or Freezer Compressor Not Starting? Test Start Relay, Overload, Capacitor, PTC Thermistor
Testing the start relay, overload, capacitor and PTC thermistor when a refrigerator or freezer compressor will not start.
Read more →Electronics, in plain language.
Occasional notes on components, circuits and projects worth building. No hype, unsubscribe anytime.
We never share your email.
Read it at your own bench first.
Then decide.
30-day money-back guarantee, free shipping