CFCs are highly inert in lower levels of atmosphere corresponding to longer residence time and higher life time in lower levels of atmosphere.

Montreal Protocol is signed on Sep 16th, 1987 to regulate the use and production of chemicals responsible for ozone layer depletion. Initially 46 counties signed the treaty, now has more than 200 signatories.

Ozone depletion substances (Man made) attributes to about 82% of the stratospheric chlorine levels. In that about 51%  is by CFC-11 & CFC-12 refrigerants.

Ozone Depletion Potential (ODP) is relative amount of degradation of the ozone layer a substance can cause with respect to R-11 or CFC-11. Therefore CFC-11 will have ODP equal to 1.

Nitrogen is purged into the evacuation system slightly above the atmospheric pressure to remove any non condensable gases & moisture from the system

Flushing agent will removes lubrication oil of compressor

The inlet to the compressor in refrigeration system is called the suction line. This line brings the low pressure vapour in to the compressor

The longer the hose, higher will be the pressure drop in the system and longer it will take time for recovery

R-410A- High Pressure Appliance
R-503- Very High Pressure Appliance
R-500- Medium Pressure Appliance
R-22- High Pressure Appliance

In push-pull recovery method the refrigerant moves directly into the storage tank without any separation of oil from the refrigerant. Push-pull generally does not work on smaller systems

Liquid refrigerant recovery method is ideal for recovering large amount of refrigerant. This recovery method is faster but leaves vapour in the system

Recycling refrigerant refers to the reduction of used refrigerant contaminants using devices that reduce oil, water, acidity, and particulates. Reclamation of refrigerants refers to the reprocessing of used refrigerants to ARI 700 specifications. Reclamation is different from recycled refrigerant, which involves process of single or multiple passes through devices like filter driers.

Reclaimed refrigerant shall meet ARI 700 purity specifications. Reclamation facilities generally purchase used recovered refrigerant if they determine it can be reclaimed from technician. They sell technician other reclaimed refrigerant that is processed earlier and certified as pure as per ARI 700

Dehydration evacuation system will remove contaminants which are capable of evaporating

The leakage rate is calculated by determining the current leak rate and projecting it over a 12-month period.

Pipe or hose carrying the refrigerant liquid from the condenser or receiver of a refrigeration system to a pressure-reducing device constitute liquid line. In liquid line refrigerant will be warm liquid phase.

Liquid line connects condenser to expansion device