Line Set
Refrigerant piping: length, flares and charge.
How to Find a Refrigerant Leak: Methods, Common Spots and the Standing Pressure Test
A step-by-step leak search for AC and heat pump systems, the leak detection methods and where each works best, the most common leak spots, and how to confirm the repair.
Mini-Split Not Cooling or Heating: A Diagnostic Order for Ductless Systems
How to troubleshoot a ductless mini-split that runs but won't cool or heat: error codes, mode and remote settings, filters and blower wheels, the outdoor unit, sensors, communication and charge.
Mini-Split Flare Connections That Don't Leak: Cutting, Flaring and Torque
The steps that keep mini-split flare joints leak-free, from cutting and deburring to flare size, oil, torque and nitrogen testing.
Mini-Split Line Set Length and Charge: When to Add Refrigerant
How factory pre-charge works on mini-splits, how to calculate additional charge for long line sets, and the limits on length and height.