EPA 608 Core Recovery Techniques

What is the reason for not mixing refrigerants in an appliance or recovery cylinder?

• To prevent harm to the environment

• To avoid damage to the appliance

• To maintain the efficiency of the refrigerant

• To comply with safety regulations

Which refrigerant generally does not need to be recovered?

• R-744 (carbon dioxide)

• R-410A

• R-22

• R-134a

What should be done when recovering R-410A or any other refrigerant from an appliance?

• Recover it into a clearly marked recovery vessel

• Mix it with other refrigerants for better performance

• Release it into the atmosphere

• Store it in any available container

When can a pressure-temperature chart be used to check for contaminated refrigerant?

• When both the pressure and temperature of the refrigerant are stable and known

• When only the pressure of the refrigerant is stable and known

• When only the temperature of the refrigerant is stable and known

• When neither the pressure nor the temperature of the refrigerant is stable and known

What should a technician do before taking a pressure reading for comparison using the pressure-temperature chart?

• Allow the temperature of the cylinder to stabilize to room temperature

• Immediately take the pressure reading without waiting

• Heat up the cylinder to increase the pressure

• Cool down the cylinder to decrease the pressure

What should a technician do if the pressure-temperature relationship does not match when checking for contaminated refrigerant?

• Turn the refrigerant in to a reclamation facility

• Continue using the refrigerant as it is

• Mix the refrigerant with another type to balance the pressure

• Dispose of the refrigerant in any available container

What might happen if mixed refrigerants are sent to a reclamation facility?

• The facility may refuse to accept them or charge extra for processing or destroying them

• The facility may accept them without any issues

• The facility may mix them with other refrigerants for better performance

• The facility may release them into the atmosphere

What is the purpose of a service aperture or process stub on small appliances?

• To add or remove refrigerant from a small appliance

• To indicate the type of refrigerant used in the appliance

• To prevent refrigerant leaks from the appliance

• To control the temperature of the appliance

What should be done before installing an access fitting onto a sealed system?

• Leak test the fitting

• Immediately proceed with recovery

• Replace the existing refrigerant with a new one

• Check the temperature of the system

Why should solderless type piercing valves not remain on refrigeration systems after repair?

• They tend to leak over time

• They improve the efficiency of the refrigeration system

• They are not compatible with certain refrigerants

• They increase the pressure inside the system