Test 1 Flashcards
Test 1
At high temperatures (for example open flames and glowing metal surfaces) R-12 and R-22 can decompose to form?
Phosgene Gas
If the EPA regulations should change after a technician becomes certified?
it is the technicians responsibility to comply with any future changes in the law
Which of the following refrigerants is most commonly used as a replacement for R-12 in new household refrigerators
R-134a
Recovery equipment used for the service or repair of small appliances must be certified by an EPA-approved laboratory if the recovery equipment was manufactured after
November 15 1993
What is the maximum allowable factory charge of refrigerant for type 1 appliances
5 pounds
Why is it important to obtain an accurate pressure reading of refrigerant inside a recovery cylinder
The pressure reading along with a temperature reading can indicate if there is excessive air or other non-condensables in the cylinder
Recovery devices that were manufactured after November 15 1993 and are used for the recovery of refrigerant from small appliances must be capable of
Recovering 90% of the refrigerant when the compressor is operating or achieving a 4 inch vacuum under the conditions of ARI
solderless piercing valves should not remain installed on refrigeration systems after completions of repairs because
They tend to leak overtime
Whenever nitrogen is used to pressurize or blow debris out of a system
Only nitrogen vapor should be used
What can cause excessive pressure on the high side of an active self-contained recovery device
A closed recovery tank inlet valve
a closed recovery tank outlet valve
Answer: Either A or B
Portable refillable tanks or containers used to ship recovered refrigerants must meet what standards
Department of transportation (DOT)
A recovery cylinder which is half full of recovered R-22 at normal room temperatures ( about 75F), in the absence of non-condensable will be pressurized to
130 psig
Which of the following refrigerants must be recovered with equipment currently regulated by the equipment certification requirements of the EPA under sections 608
R-12
In the event of a large release of R-12 or R-22 in a contained area, which of the following is true
Self contained breathing apparatus or leaving the area is required
Which recovery equipment maintenance procedure should be performed on a regular basis
Check recovery device for refrigerant leaks
Small amounts of refrigerant are odorless, so if a pungent odor is detected during a system recovery or repair
A compressor burnout has likely occurred
When recovering refrigerant into a non-pressurized container from a refrigerant with an inoperative compressor
It is necessary to heat and strike the compressor with a rubber mallet
Large spills of refrigerants can cause suffocation because
They are heavier than air and displace the oxygen
Which of the following is not a type 1 appliance
An MVAC system that holds three pounds of r-12
When R-500 is recovered from an appliance it
must be recovered into its own recovery vessel or a recovery cylinder that already contains R-500
