HVAC Shop Blog

R32's higher operating pressures and A2L flammability classification mean manifold gauge compatibility is a genuine safety and compliance issue, not just a spec sheet detail. This guide covers how to verify pressure ratings, seal materials, and refrigerant compatibility on your existing manifold, plus what changes in the charging workflow when you move from R22 or R410A onto R32 systems.

Reading a manifold gauge correctly is a foundational skill that separates confident diagnosis from guesswork. This step-by-step guide covers gauge layout and scales, superheat and subcooling calculation, and how to interpret abnormal pressure readings to diagnose what's actually happening in the system.