Test 2 Flashcards
When using a passive system-dependent recovery method on an appliance with an operating compressor, you should run that appliances compressor
for several minutes, shutting it off, then recover the refrigerant from the low side.
A passive system-dependent recovery device for small appliances
captures refrigerant in a non-pressurized container
The sale of CFC and HCFC refrigerants is
restricted to technicians who are EPA certified in refrigerant recovery.
Which of the refrigerants listed below should be recovered with current EPA-approved recovery devices?
None of the above (Water, Hydrogen, Ammonia)
When servicing a small appliance with a leak
it is not mandatory to repair the leak but doing so is most responsible.
For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for refrigerant recovery?
A domestic refrigerator
When using any equipment or servicing any system that has Schrader valves, it is critical to
inspect the Schrader valve core for bends and breakage.
replace any damaged Schrader valve core to prevent leakage.
cap the Schrader ports to prevent accidental depression of the valve core.
(All of the above.)
If R-12 or R-22 are exposed to high temperatures from open flames, glowing hot metal surfaces etc, these refrigerants can decompose to form
hydrochloric acid and hydrofluoric acid
When using a graduated charging cylinder, any refrigerant that is vented from the charging cylinder
must be recovered.
A standard vacuum pump designed specifically for evacuation and dehydration can
never be used as a recovery device in combination with a pressurized container.
The EPA section 608 certification must be renewed every
The EPA certification has no expiration date.
Prior to shipping any used refrigerant it is necessary to
properly label the refrigerant container.
properly complete shipping paperwork.
check that the refrigerant container meets Department of Transportation standards.
Answer All of the above.
A refrigerant that can be used as a direct service “drop-in” substitute for R-12 in a small appliance is
R-410a
R-134a
R-141b
Answer None of the above
After installing and opening a piercing access valve, if the system is _______ do not begin the recovery procedure.
0 psig
The EPA definition of a small appliance includes which of the following?
A device manufactured, charged, and hermetically sealed from the factory.
A device with a charge of 5 pounds or less.
Products with compressors under one quarter horsepower.
Answer Both A and B.
When using _________ , it is essential to take extra measures such as heating or striking the compressor, to help release trapped refrigerant from the compressor oil.
a passive system-dependent recovery device on a small appliance with a non-operating compressor
It is an EPA regulation that any person who opens an appliance for maintenance, service, or repair, must have at least one self-contained recovery machine available at their place of business. The only exception to this rule are persons working on
small appliances.
Which of the following are part of the EPA’s recommended safe work practices?
Wear safety glasses or goggles when working with any compressed gas.
Wear a respirator when working with any refrigerant.
Wear butyl-lined gloves when connecting/disconnecting hoses.
Both A and C
Recovery devices that were manufactured before November 15 1993 and are used for recovery of refrigerant from small appliances must be capable of
recovering 80% of the refrigerant whether or not the compressor is operating or achieving a 4-inch vacuum under conditions of ARI 740-1993.
Piercing-type valves should only be used on which of the following type tubing materials?
Copper And Aluminum
When using a passive system-dependent recovery process, you should access both the high side and low side of the system for the refrigerant recovery if
the systems compressor does not run.
On a small appliance with an operating compressor that has a completely plugged capillary tube, what is the minimum number of access valves that are needed to evacuate the refrigerant?
Only one access valve on the high side of the system.
Technicians with a Type I small appliance certification are certified to recover refrigerant during the maintenance, service, or repair of
packaged terminal air-conditioners (PTACs) with pounds or less of refrigerant.
A recovery cylinder which is half full of recovered R-500 at normal room temperature, about 75F, in the absence of non-condensables, will be pressurized to
95 psig
