609 ESCO 100% EXPERT VERIFIED CORRECT
AND UPDATED 2025!
Contaminated refrigerants must be handled with some extra precautions. If you
are unsure about a refrigerant, EPA strongly recommends (but does not require)
that technicians obtain a refrigerant identifier as a useful tool. When a technician
encounters a "mystery" refrigerant, it must be recovered using a piece of
equipment dedicated to this purpose. Unapproved refrigerants may contain a high
percentage of flammable substances, such as propane or butane, and a fire hazard
may result. Check with your equipment manufacturer to be sure the equipment has
protection against risks of ignition. Once the refrigerant has been recovered, it
must be properly stored and/or sent to a reclamation facility to be reclaimed or
destroyed. Refrigerants From Non-Mobile Sources Refrigerant recovered from non-
mobile sources, such as residential or commercial air conditioners or refrigeration
systems may not be used in MVAC systems or reco --- correct answer ---page 5
HFO-1234yf The Hydro Fluoro Olefin Refrigerant HFO-1234yf was developed
through a joint project between Chemours (Formally DuPont) and Honeywell. HFO-
1234yf is expected to become the preferred global alternative refrigerant candidate
for automotive OEM applications and the aftermarket. HFO-1234yf has a GWP of 4
and an ODP of zero. HFO-1234yf has a cooling capacity that is comparable to HFC-
134a and is compatible with HFC-134a components. Furthermore, this refrigerant
does have a flammability factor, which will need to be addressed prior to its
adoption as a substitute for HFC-134a. Recovery Cylinders Recovery cylinders
differ in many ways from disposable cylinders. A disposable cylinder such as those
used for new product, are not refillable and MUST NEVER be used for recovery.
Recovery cylinders are specifically designed to be refilled. Recovery cylinders have
at least two ports, one vapor and one liquid. The EPA is --- correct answer ---page
6
, Manifold Gauge Set When servicing a system with a manifold gauge set, the high,
low, and center hoses must have shut off valves within 12 inches (30 cm) of the
service ends. Shut off valves can be manually operated or close automatically when
the hose is removed. During all service operations, the shut off valves should be
closed until connected to the system or the charging source to prevent the
introduction of air and to contain rather than vent any refrigerant. When the gauge
set is removed from the vehicle or charging source, it must be connected to the
recovery equipment to recover the refrigerant from the hoses. Recycling
Requirements Approved recycling equipment must meet all of the criteria that
recovery only equipment must meet. In addition, recycling equipment must clean
the used refrigerant to the minimum purity level as defined in SAE standards
before it can be used in a motor vehicle air conditioning sys --- correct answer ---7
When using an electronic leak detector, always follow the manufacturer's
operating instructions. In addition to the manufacturer's instructions, the
following should be observed: 1. Always leak test with the engine off. 2. Only, a
small amount of refrigerant is required to perform a leak test. A gauge reading of
50 psi is all that is needed. At temperatures below 50°F., leaks may not be
measurable, since 50 psi may not be attainable. 3. To avoid contaminating the tip
of your leak detector, remove excessive dirt from suspected leak areas. Do not use
cleaners or solvents, your detector may be sensitive to their ingredients. 4.
Visually inspect the system, and look for signs of air conditioning oil leakage,
damage, and corrosion on all lines, hoses, and components. Each suspected area
should be carefully checked. 5. Follow the system around in a continuous path to
ensure that no areas are missed. If a leak is found, con --- correct answer ---page 8
concerning the issue of leak repairs. 7 Proper Charging and Recharging of MVAC
Systems After system evacuation, and dehydration the system can be charged with
AND UPDATED 2025!
Contaminated refrigerants must be handled with some extra precautions. If you
are unsure about a refrigerant, EPA strongly recommends (but does not require)
that technicians obtain a refrigerant identifier as a useful tool. When a technician
encounters a "mystery" refrigerant, it must be recovered using a piece of
equipment dedicated to this purpose. Unapproved refrigerants may contain a high
percentage of flammable substances, such as propane or butane, and a fire hazard
may result. Check with your equipment manufacturer to be sure the equipment has
protection against risks of ignition. Once the refrigerant has been recovered, it
must be properly stored and/or sent to a reclamation facility to be reclaimed or
destroyed. Refrigerants From Non-Mobile Sources Refrigerant recovered from non-
mobile sources, such as residential or commercial air conditioners or refrigeration
systems may not be used in MVAC systems or reco --- correct answer ---page 5
HFO-1234yf The Hydro Fluoro Olefin Refrigerant HFO-1234yf was developed
through a joint project between Chemours (Formally DuPont) and Honeywell. HFO-
1234yf is expected to become the preferred global alternative refrigerant candidate
for automotive OEM applications and the aftermarket. HFO-1234yf has a GWP of 4
and an ODP of zero. HFO-1234yf has a cooling capacity that is comparable to HFC-
134a and is compatible with HFC-134a components. Furthermore, this refrigerant
does have a flammability factor, which will need to be addressed prior to its
adoption as a substitute for HFC-134a. Recovery Cylinders Recovery cylinders
differ in many ways from disposable cylinders. A disposable cylinder such as those
used for new product, are not refillable and MUST NEVER be used for recovery.
Recovery cylinders are specifically designed to be refilled. Recovery cylinders have
at least two ports, one vapor and one liquid. The EPA is --- correct answer ---page
6
, Manifold Gauge Set When servicing a system with a manifold gauge set, the high,
low, and center hoses must have shut off valves within 12 inches (30 cm) of the
service ends. Shut off valves can be manually operated or close automatically when
the hose is removed. During all service operations, the shut off valves should be
closed until connected to the system or the charging source to prevent the
introduction of air and to contain rather than vent any refrigerant. When the gauge
set is removed from the vehicle or charging source, it must be connected to the
recovery equipment to recover the refrigerant from the hoses. Recycling
Requirements Approved recycling equipment must meet all of the criteria that
recovery only equipment must meet. In addition, recycling equipment must clean
the used refrigerant to the minimum purity level as defined in SAE standards
before it can be used in a motor vehicle air conditioning sys --- correct answer ---7
When using an electronic leak detector, always follow the manufacturer's
operating instructions. In addition to the manufacturer's instructions, the
following should be observed: 1. Always leak test with the engine off. 2. Only, a
small amount of refrigerant is required to perform a leak test. A gauge reading of
50 psi is all that is needed. At temperatures below 50°F., leaks may not be
measurable, since 50 psi may not be attainable. 3. To avoid contaminating the tip
of your leak detector, remove excessive dirt from suspected leak areas. Do not use
cleaners or solvents, your detector may be sensitive to their ingredients. 4.
Visually inspect the system, and look for signs of air conditioning oil leakage,
damage, and corrosion on all lines, hoses, and components. Each suspected area
should be carefully checked. 5. Follow the system around in a continuous path to
ensure that no areas are missed. If a leak is found, con --- correct answer ---page 8
concerning the issue of leak repairs. 7 Proper Charging and Recharging of MVAC
Systems After system evacuation, and dehydration the system can be charged with
