HVAC Systems · Refrigeration — Charge & Diagnostics
Fixed Orifice / Piston
A non-adjustable metering device (a fixed-bore piston or capillary tube) that meters refrigerant by pressure difference alone. Systems with a fixed orifice are charged by the superheat method against a charging chart.
Related terms
Pro launch updates
Get notified when Pro launches, plus a monthly code-change digest. Email only — no account required.