Examen Studio bloghttps://examenstudio.com/blog/313A refrigeration and air conditioning concepts explained, with sources.en-ca Superheat vs subcooling: what each reading tells youhttps://examenstudio.com/blog/superheat-vs-subcooling/https://examenstudio.com/blog/superheat-vs-subcooling/Mon, 21 Sep 2026 12:00:00 GMTSuperheat reads the evaporator, subcooling reads the condenser. How to calculate both, which one to charge by, and how to read them together. Undercharge or restriction? Telling two starved evaporators aparthttps://examenstudio.com/blog/undercharge-vs-restriction/https://examenstudio.com/blog/undercharge-vs-restriction/Mon, 21 Sep 2026 12:00:00 GMTLow suction pressure and high superheat can mean a leak or a restriction. Subcooling and a temperature drop across the drier tell you which. Reading a vacuum decay test: leak or moisture?https://examenstudio.com/blog/vacuum-decay-test/https://examenstudio.com/blog/vacuum-decay-test/Mon, 21 Sep 2026 12:00:00 GMTWhat a micron gauge is telling you after you valve off the pump, why the compound gauge can't, and how to set up an evacuation that finishes. Temperature glide, dew point and bubble point, explainedhttps://examenstudio.com/blog/temperature-glide-dew-bubble/https://examenstudio.com/blog/temperature-glide-dew-bubble/Mon, 21 Sep 2026 12:00:00 GMTWhy zeotropic blends like R-407C have two PT values, which one to use for superheat and subcooling, and why they must be charged as liquid. What Canada's Federal Halocarbon Regulations, 2022 actually sayhttps://examenstudio.com/blog/federal-halocarbon-regulations-2022/https://examenstudio.com/blog/federal-halocarbon-regulations-2022/Mon, 21 Sep 2026 12:00:00 GMTA section-by-section summary of the rules on release, recovery, leak testing and charging, who they apply to, and where Ontario's own regulation takes over. A2L refrigerants: what the safety class means for the jobhttps://examenstudio.com/blog/a2l-refrigerants/https://examenstudio.com/blog/a2l-refrigerants/Mon, 21 Sep 2026 12:00:00 GMTWhat the A and the 2L stand for, which common refrigerants are A2L, and what changes in tools, recovery and installation practice. Identifying compressor terminals with an ohmmeterhttps://examenstudio.com/blog/compressor-windings-ohmmeter/https://examenstudio.com/blog/compressor-windings-ohmmeter/Mon, 21 Sep 2026 12:00:00 GMTHow to find common, start and run on a single-phase compressor from three resistance readings, check the math, and test for a grounded winding. A 90-day 313A study plan built on the exam weightshttps://examenstudio.com/blog/313a-study-plan/https://examenstudio.com/blog/313a-study-plan/Mon, 21 Sep 2026 12:00:00 GMTHow to spend study time in proportion to the Red Seal breakdown, find weak areas early, and use the last weeks for review instead of new material.