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25 Cards in this Set
- Front
- Back
Shipping used refrigerant
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To much **** to type |
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Ozone in stratosphere consists of molecules containing |
3 oxygen atoms |
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Unlike other chlorine compounds and naturally occurring chlorine,the chlorine in cfcs and hcfcs will ? |
Neither dissolve in water nor break down into compounds that dissolve in water |
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HFCs are made up of hydrogen, fluorine and carbon. They do NOT contain? |
Chlorine that effects the ozone layer but most HFCs have a high GWP |
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Most HFC refrigerants such as R-410A |
Have global warming potentials thousands of times greater then carbon dioxide |
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The global warming potential of isobutane (R600a) propane (R-290) and R441a are significantly lower |
When compared to GWP of HFCs such as (R-134a,R-407c,R-404a and R-410a |
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Azeotropic refrigerants mixtures contains 2 or more refrigerants.at a certain pressure an azeotropic mixture evaporates and condenses at constant temperature |
It acts like a single component refrigerant over its entire range |
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Zeotropic or non azeotropic refrigerants their blend may be ? |
Maybe binary (2 parts ) or ternary (3 parts) |
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Temperature glide can range ? |
A few tenths of a degree to 12degrees or more |
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The R 400 series of refrigerants are near azeotropic blends that can leak from a system at uneven rates due to? |
Different vapor pressure which can effect the percentage of each refrigerant remaking in the system |
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The EPA does not approve any substitute refrigerant as direct drop in replacement to service any? |
R22 or any other system |
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Most HCFC binary and ternary blends use |
Alkylbenze lubricant |
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Care must be taken when using ester based oils ? |
They are very hydroscopic and will absorb moisture out of the air and through some containers |
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The clean air acts (epa regulations) allows for releasing refrigerant ? |
A small amount of refrigerant mixed with nitrogen (trace gas) for leak detection |
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Reclamied refrigerant must meet ? |
AHRI standard 700 |
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Technicians can only charge used CFC HCFC or HFC if |
Appliance is owned by same customer |
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Recovery equipment must be tested according to |
AHRI standard 740 |
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Recovery devices remove refrigerant from a appliance without assistance from other components |
Self contained |
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Recovery devices remove refrigerant from a appliance without assistance from other components |
Self contained |
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Recovery that relies on the compressor in the appliance is ? |
System dependent |
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Epa requires appliances that do not have service valves to have ? |
Aperture or process’s stub |
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Release of CFC,HFC HCFC or HFO refrigerant is ? |
Prohibited |
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A technician must have separate refrigerant cylinders for |
Each type of refrigerant and should have a separate cylinder for know mixed refrigerant |
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Most manufacturers require system evacuation to ? |
500 microns or lower |
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When pressurizing a system with nitrogen you should always charge through |
Pressure regulator and a relief valve in the downstream line from the pressure regulator |
