CFCs are highly stable in lower atmosphere and have a lifetime of about 20 to 100 years. This higher lifetime helps in diffusing CFCs into stratosphere where CFC molecule react with UV radiation depleting ozone layer.

In stratosphere, when sun’s UV radiation breaks down the CFC molecule chlorine ion is formed. This chlorine ion strips an oxygen atom from ozone (O3) forming chlorine monoxide (ClO) and molecular oxygen (O2). The formed chlorine monoxide (ClO) radical strips another free oxygen atom and releases the chlorine ion to repeat the process. This process continuous in cycle resulting in greater depletion of ozone layer.

CFCs has highest Ozone Depletion Potential because of the presence of chlorine element which reacts with ozone at stratosphere

Suction line brings low pressure vapor from evaporator to compressor

As heat is removed from the refrigerant at condenser, it reaches its saturation temperature and starts to flash (change its state) into high pressure liquid

Thermostatic Expansion Valve connected between condenser and evaporator helps in regulating the flow of liquid refrigerant entering the evaporator for variation in the load. It helps in maintain the predetermined constant evaporator superheat in refrigeration system.

Electronic leak detector can able to detect the leak rates of about 0.5 oz per year. Ultra sound leak detector listens to the noise of gas leakage.Fluorescent leak detector detects the leak with the help of dyes. These dyes can cause strains on the equipment and foreign substances in dyes could invalidate the warranty. Also this method cannot be able to detect the immediate leak.

Nitrogen is colorless, odourless, non inflammable and readily available (economical) gas. It may not cause any acidic formation when reacts with oxygen or moisture which can result in corrosion. CO2 in presence of moisture forms carbonic acid

Vacuum test is not the efficient of leak detection.

If system has leak, the pressure increases to 0 psig (atmospheric pressure) and stops. If the pressure is greater than 0 psig and stops at some point means refrigerant or water is still evaporating in the system.

If it is filled beyond 80% during increase in temperature the refrigerant expands results in increase in pressure inside the cylinder which can lead to bursting of cylinder

1. Small appliances (Type I)
2. Low pressure appliances (Type III)
3. Medium Pressure appliances (Type II)
4. High pressure appliance (Type II)
5. Very high pressure appliances (Type II)

Reclaimed refrigerant shall meet ARI 700 purity standard

Recovery unit with sub-cooling feature accelerates the rate of recovery as it lowers the temperature of the recovery tank

In recovery cylinder refrigerants shall not be mixed