Charge Limits & Recovery Calculators

Calculate the maximum permissible refrigerant charge for A2L and A3 (flammable) refrigerants based on room volume and the refrigerant's practical limit. For occupied spaces, the charge must not exceed the room volume multiplied by the refrigerant's practical limit concentration.

Refrigerant R-32 (A2L) R-454B (A2L) R-1234yf (A2L) R-1234ze(E) (A2L) R-290 Propane (A3) R-600a Isobutane (A3)

Room Length (m)

Room Width (m)

Room Height (m)

Installation Height Floor level (heavier than air) Above head height (>1.8 m)

Calculate Charge Limit

Calculate the maximum safe fill weight for a recovery cylinder. Cylinders must never be filled beyond 80% of their water capacity (WC) by weight. This ensures safe headspace for thermal expansion.

Cylinder Water Capacity - WC (kg)

Tare Weight (kg) — empty cylinder weight

Refrigerant R-410A (density 1.06 kg/L) R-32 (density 0.96 kg/L) R-134a (density 1.21 kg/L) R-404A (density 1.05 kg/L) R-407C (density 1.14 kg/L) R-507A (density 1.03 kg/L) R-290 (density 0.49 kg/L)

Calculate Fill Limit