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EPA Sec608 > Type 2 prep > Flashcards

Type 2 prep Flashcards

1
Q

What certification do technicians must have maintain, service, repair, or dispose of medium, high, and very-pressure appliances?

A

Type 2 or universal EPA certification.

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2
Q

What is defined by EPA as comfort cooling for leak repair category?

A

Air-conditioning appliances used to supply cooling in order to control heat and/or humidity in residential, office, and commercial buildings.

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3
Q

What is classified by EPA as Commercial Refrigeration?

A

Appliances (equipment) used to preserve products, as in the retail food and cold storage warehouse sectors.

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4
Q

When is the applicable maximum leak rate determined by the highest percentage of use?

A

When an appliance has a dual use.

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5
Q

What is the leak rate category when a company uses 55% of the systems cooling capacity to one of its manufacturing lines and 45% to cool its offices?

A

It is considered Industrial Process Refrigeration (IPR) for the leak rate category.

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6
Q

How do you determine normal charge for leak rate calculations when it’s a packaged system charged at the factory?

A

Use the charge stated on the equipment nameplate.

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7
Q

How do you determine the charge for field-piped split -systems?

A

Use the factory charge and calculate the added charge for pipping and accessories.

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8
Q

When can you calculate the leak rate of an appliance?

A

When topping off or recharging a system due to a loss of charge.

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9
Q

What is the easiest way to determine refrigerant type in a packaged rooftop unit?

A

Checking the nameplate.

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10
Q

Other than refrigerant type, what will the nameplate also indicate?

A

The system’s total charge.

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11
Q

When is a liquid charge by weight through the liquid-line service valve the best method to charge a system?

A

When a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds.

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12
Q

What does the EPA’s leak repair requirements apply to?

A

All appliances using regulated refrigerants.

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13
Q

When must the owner repair the appliance enough to bring the leak rate below the threshold?

A

When the threshold leak rate has been exceeded on any system with a charge size of 50 pounds or greater.

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14
Q

What else can be done if an appliance with a charge of 50 pounds or greater exceeds the threshold leak rate?

A

If the owner cannot, or chooses not to, bring the leak rate below the threshold, the appliance must be retrofitted or retired.

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15
Q

What is the same for Type 2 and Type 3 certifications?

A

Leak repair requirements.

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16
Q

What is the maximum leak rate for comfort cooling?

A

10% of the charge per year.

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17
Q

What is the maximum leak rate for commercial refrigeration?

A

20% of the charge per year.

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18
Q

What is the maximum leak rate for Industrial process refrigeration?

A

30% of the charge per year.

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19
Q

How much time does an owner operator have to repair and conduct an initial verification test to an appliance with a charge sized of at least 50 pounds ?

A

30 days unless the EPA grants additional time.

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20
Q

When must a follow-up verification test be conducted within 10 days?

A

When an appliance with at least 200 pounds of charge has passed the initial verification test.

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21
Q

What cannot be used as a reason to extend the appliance leak repair deadline?

A

Not having a certified service technician available.

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22
Q

What if the system fails the initial leak verification test after repairing a HCFC rack refrigeration system?

A

The technician has 30 days to make additional repairs or develop a retrofit plan.

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23
Q

How long can a cold storage warehouse operate an appliance leaking above the threshold rate?

A

It can continue to operate the appliance without repair for 12 months before it must be retrofitted or retired.

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24
Q

When must a report be submitted to EPA describing the efforts to identify and repair system leaks?

A

When the system leak rate exceeds 125% of its full charge in a calendar year.

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25
Q

How can the repair deadline of an appliance using an ozone-depleting refrigerant be extended?

A

By temporarily shutting down the appliance, recovering the refrigerant from a section or the entire system to at least atmospheric pressure.

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26
Q

When does the owner or operator have 18 months to retrofit or retire a leaking appliance?

A

When the replacement appliance uses refrigerant exempt from the venting prohibition.

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27
Q

What is required for appliances that exceed the applicable leak rate?

A

Initial and follow-up verification tests of leak repairs.

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28
Q

What must the verification tests demonstrate?

A

That leaks were successfully repaired.

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29
Q

What is only performed after the appliance has returned to normal operating conditions and has no minimum timeframe?

A

A follow-up verification test.

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30
Q

What are techs required to provide service invoices and records of?

A

Leak inspections or verification tests to owners/operators.

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31
Q

How often are commercial refrigeration and industrial process refrigeration system with at least a 500 pound charge inspected for leaks until verification that leak rate has not been exceeded?

A

Every 3 months for one year after repair.

32
Q

How long must records of inspections, verifications, and tests be kept on file?

A

Records must be kept on file for at least 3 years by the owner/operator.

33
Q

How do you leak check after assembly and installation of a split system?

A

First pressurize with nitrogen and then check for leaks.

34
Q

When should dry-nitrogen with a trace amount of the system’s design refrigerant be used for leak detection?

A

When absolutely necessary.

35
Q

When should you look for traces of oil?

A

When first inspecting an operating hermetic system known to be leaking.

36
Q

What is an indication of leak on a belt-driven compressor?

A

Oil traces on the rotating shaft seal, especially if the compressor has not been used for several months.

37
Q

How do you best pinpoint refrigerant leaks?

A

Testing with soap bubbles.

38
Q

When should a refrigerant leak be suspected on a high-pressure capillary tube system?

A

When the system operates with excessive superheat.

39
Q

What purchase is not required to be reported to the EPA?

A

Active recycling and recovery equipment for Type 2 refrigeration appliances.

40
Q

What must be determined before you recover refrigerant?

A

The maximum amount of refrigerant that is contained in the system.

41
Q

When does the EPA prohibit passive recovery techniques?

A

When the system charge is greater than 15 pounds.

42
Q

What must be checked before using a recovery unit to remove a charge?

A

Check the service valve positions and recovery oil level.

43
Q

When must you remove any refrigerant remaining in the recovery unit and change the unit’s filter?

A

When recovering a different refrigerant type than the last recovered using the specific recovery unit.

44
Q

What may contain impurities of acids, moisture, and oil?

A

The recovered refrigerant.

45
Q

What is required to minimize refrigerant release when the hoses are connected or disconnected?

A

The gauge hoses used to recover refrigerant require self-sealing connectors or hand valves.

46
Q

What should be done before transferring refrigerant to an empty cylinder?

A

The cylinder should be evacuated to reduce the pressure and remove non-condensables.

47
Q

What must be made certain before recovering refrigerant in a parallel piped compressor system?

A

The equalization connections between compressors are closed.

48
Q

What recovery machines are generally connected to the municipal water supply?

A

Recovery machines that utilize a water-cooled condenser.

49
Q

How do you reduce recovery time?

A

Connect one of the service hoses to the liquid line.

50
Q

How do you reduce recovery time when the condenser is below the receiver?

A

Remove refrigerant from the condenser outlet.

51
Q

What will minimize oil loss from the appliance although slower than liquid recovery?

A

Recovering refrigerant in the vapor phase.

52
Q

When must HVAC service companies keep records for 3 years?

A

When disposing an appliance with a charge of 5 to 50 pounds.

53
Q

What will speed up the recovery process or removal of refrigerant charge from a system?

A

Cooling the recovery cylinder by lowering its pressure.

54
Q

What can also speed up the recovery process by increasing the pressure differential between the system and the tank?

A

Heating the system.

55
Q

Why should the recovery unit’s compressor temperature be closely monitored?

A

Hermetic compressor motors on recovery machines rely on the flow of refrigerant for cooling and may overheat when drawing deep vacuums.

56
Q

How can the motor winding of a hermetic refrigeration compressor become damaged while being recovered?

A

It can become damaged if energized under a deep vacuum.

57
Q

What is the required level of evacuation during recovery for very high-pressure appliances?

A

0” Hg.

58
Q

What is the required level of evacuation during recovery for a high-pressure appliance with a charge under 200 lbs?

A

0” Hg.

59
Q

What is the required level of evacuation during recovery for a high-pressure appliance with a charge of 200 lbs or greater?

A

10” hg.

60
Q

What is the required level of evacuation during recovery for a medium-pressure appliance with a charge of less than 200 lbs?

A

10” Hg.

61
Q

What is the required level of evacuation during recovery for a medium-pressure appliance with a charge of 200 lbs or greater?

A

15” Hg.

62
Q

What is the evacuation level of an appliance using more than 200 lbs of R-410A (high-pressure)?

A

10 inches of Hg vacuum.

63
Q

Where can the liquid receiver be found on a system that using a TXV as its metering device?

A

Typically on the liquid line at the outlet of the condenser.

64
Q

What is the state of refrigerant leaving the receiver during system operation?

A

A high-pressure liquid.

65
Q

What should be done prior to opening a system with a liquid line receiver for repair, to eliminate the need to recover the system’s refrigerant?

A

The system’s refrigerant should be pumped down and isolated in the receiver.

66
Q

What is used for checking refrigerant for moisture?

A

A moisture indicating sight glass.

67
Q

Where is the sight glass located?

A

In the liquid line, immediately downstream after the liquid-line filter drier.

68
Q

What should be replaced whenever the system is opened up for service?

A

The liquid-line filter drier.

69
Q

What is the filter drier’s purpose?

A

To remove moisture from the refrigerant in the system.

70
Q

Where can accumulators be found?

A

In the suction line, at the outlet of the evaporator before the compressor.

71
Q

What is the purpose of an accumulator?

A

To prevent any liquid refrigerant flowing from the evaporator to the compressor.

72
Q

What are the normal operating positions for the suction service valve and discharge valve?

A

back-seated position.

73
Q

When should the discharge valve be closed on an operating reciprocating compressor?

A

Discharge valve should never be closed on operating compressor.

74
Q

How should multiple pressure relief valves be installed?

A

In parallel.

75
Q

What is used to reduce the amount of refrigerant in the oil and to reduce oil foaming?

A

Crankcase heaters.

EPA Sec608 (4 decks)

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