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
Using the Total Superheat Charging Method for HVAC Units!
The Total Superheat method step by step for fixed orifice systems. See also Target Superheat.
Read more →
Why Can't You Just Measure Pressures to Check a Refrigerant Charge?
Why pressure alone does not tell you whether the charge is correct.
Read more →
Checking the Charge of a Mini-Split Unit!
How checking the charge on an inverter mini split differs from a single speed system.
Read more →
10 Reasons Why a Mini-Split Ductless Flare May Leak Refrigerant!
Ten things that cause a flare connection to leak on a ductless mini split.
Read more →
How NOT to Check the Refrigerant Charge!
The common shortcuts that produce a wrong charge, and what to do instead. See Charging Procedures.
Read more →
Charging a System in a Dry Climate? Consider a TXV and Accumulator!
Why a dry climate changes the charging picture, and where a TXV and accumulator help.
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