R-427A is a non-azeotropic mixture of HFC refrigerant gases, with zero ozone layer depletion, used as an indirect replacement (retrofit), in R-22 equipment at above-zero and mid-range temperatures.
R-427A is a similar refrigerant to R-22 and R-407C in terms of working pressures, capacity and energy efficiency for above-zero and mid-range evaporation temperatures. Emptying of the original oil is required (mineral o alkylbenzene) to be replaced with a POE synthetic oil. R-427A has a very high temperature slip so that in the case of leakage in the low pressure line (vapour) a refill is not recommended as the mixture present in the system will be extremely deteriorated and the equipment would not function satisfactorily. The composition of the vapour phase remaining in the containers will have diverged from the product specifications.
· General commercial and domestic air conditioning systems.
· Rooftop Units.
· Supermarket chilled goods equipment.
· Food Storage.
· Cold chambers.
· Refrigerated transport.
- High temperatures
- Medium temperatures
· Dos not damage the ozone layer, ODP = 0.
· Changing mineral oil or alkylbenzene for POE synthetic oil is required.
· No need for existing equipment to be changed.
· In case of leakage, empty and refill with a completely new load.
· Lower discharge temperatures than R-22, which extends the life of the compressor.
· Achieves a cooling capacity and energy efficiency similar to that of R-22 in most systems.
· Global warming potential (GWP) = 2138
· Boiling point at 1.013 bar (ºC): -42.7
· Temperature slip or glide (ºC): 7.1
· Saturated vapour density at 25ºC (kg/m3): 41.47
· UN nº: 1078
· Safety classification: A1. Low toxicity and nonflammable.
· Always load in its liquid phase.
- Synthetic POE oils
· Not recommended for flooded evaporators or centrifugal compressors.
· An R-22 retrofit in equipment with hermetic compressors is complicated due to the difficulty of changing the system’s original oil.
· Because of the great similarity to R-407C in its composition, R-427A behaves in virtually the same way.