#3 EPA 608 Type I

A passive system-dependent recovery process for small appliances;

• still uses a pump to recover refrigerant.

• must use a pressure relief device when recovering refrigerant.

• captures refrigerant in a non-pressurized container.

• can only be performed on a system with an operating compressor.

A very large refrigerant leak can cause suffocation because refrigerants;

• smell strong and make breathing difficult.

• are lighter than air and cause dizziness.

• are heavier than air and displace oxygen.

• sting the nose and cause sneezing.

All appliances must be equipped with a service aperture or process stub which is used when adding or removing refrigerant from the appliance. What is typically used on small appliances?

• A straight piece of tubing that is entered using a piercing access valve.

• A line located 15 inches below the compressor

• A valve installed at the factory which has a 1/4 inch diameter and machine threads.

• A service aperture is not present because small appliances are exempt from this requirement.

Any person who opens an appliance containing a CFC, HCFC, or HFC for maintenance, service or repair must have at least one self-contained recovery machine available for use. The exception to this rule are persons working on;

• small appliances.

• low-pressure appliances.

• high-pressure appliances.

• very high-pressure appliances.

EPA Section 608 rules require capture of 80% of the HCFCs and HFCs from a small appliance sealed system with a non-operating compressor if technicians are using;

• a system-dependent (passive) process.

• a self-contained (active) process.

• either a passive or an active recovery process.

• neither recovery process.

How many access valves are needed to recover the refrigerant on a sealed system with an operating compressor that has a completely restricted capillary tube?

• Two valves, one on the high and one on the low side of the system.

• Only one access valve, on the low side of the system.

• Only one access valve, on the high side of the system.

• Two valves, one at the inlet to the compressor and one at the outlet of the condenser coil.

A standard vacuum pump designed specifically for evacuation and dehydration can;

• be used alone as a self-contained (active) recovery device.

• never be used as a recovery device in combination with a pressurized container.

• be used alone as a substitute for any recovery device.

• be used alone as a system-dependent (passive) recovery device.

After recovering refrigerant from a sealed system, if nitrogen is used to pressurize or blow debris out of the system, the nitrogen;

• must be recovered.

• may be vented to the ambient air.

• should be returned to the cylinder.

• should only be used if mixed with R-22.

New household refrigerators may be factory charged with any of the following refrigerants, EXCEPT;

• R-290

• R-450A

• R-600a

• R-404A

What can CFC and HCFC refrigerants decompose into at high temperatures (e.g. open flames, glowing metal surfaces, etc.)?

• Boric and chromic acids

• Sulfuric and phosphoric acids

• Hydrochloric and hydrofluoric acids

• Phosphoric and dodecylbenzenesulfonic acid