HVACopediaRecovery cylinder max fill
The 80% rule: how much refrigerant a cylinder may hold.
More refrigeration calculators
Superheat (fixed orifice / cap tube)Actual superheat and the target from the outdoor and indoor temperaturesSubcooling (TXV systems)Subcooling from the head pressure and the liquid line tempVacuum pump sizePump size and vacuum targets by system sizeVacuum decay testLeak or moisture? Read the micron rise after isolating the pumpWalk-in cooler / freezer loadWall, door-air, product and extra heat loads; suggested capacityDefrost heater energykWh and heat added per day from the defrost cycles
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Calculation aids and reference figures for licensed technicians. Always follow the manufacturer’s data plate and manual for the exact model, and local codes. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Pressures are typical saturation values and change with load and airflow.