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EPA Sec608 > Type 1 prep > Flashcards

Type 1 prep Flashcards

1
Q

What certification must persons handling refrigerant during maintenance, service, or repair of small appliances have?

A

Type 1 or universal certificiation.

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2
Q

What is the EPA definition of a small appliance?

A

Products manufactured, fully charged, and hermetically sealed in a factory containing five pounds or less of refrigerant.

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3
Q

What kind of systems may not be serviced by Type 1 technicians?

A

Split systems.

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4
Q

What can technicians who are EPA certified in refrigerant recovery NOT do?

A

Sell CFC, HCFC, HFC, and HFO refrigerants to service or install refrigeration and air-conditioning equipment.

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5
Q

What does not meet the criteria for type 1 appliance certification no matter the type or quantity of refrigerant?

A

MVAC-like systems.

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6
Q

What cannot be used for new type 1 appliances?

A

HCFCs and HFCs such as R-404A.

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7
Q

When do you use only EPA-approved substitutes?

A

When retrofitting or converting a system to use a different refrigerant.

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8
Q

Do “drop-in” substitutes exist?

A

There are no such thing as “drop-in” substitutes.

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9
Q

Does the EPA approve any substitute refrigerants as a direct “drop-in” replacement?

A

The EPA does not approve any substitute refrigerants as a direct “drop-in” replacement.

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10
Q

What must be certified by an EPA-approved laboratory?

A

Recovery equipment used during the maintenance, service, or repair of small appliances that use CFCs, HCFCs, and HFCs.

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11
Q

When can either self-contained (active) or passive recovery equipment be used?

A

When performing maintenance, service, or repair of Type 1 appliances containing a CFC, HCFC, or HFC.

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12
Q

Provide an example of an appliance on which it would be permissible to use a passive recovery device.

A

A domestic refrigerator.

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13
Q

What is the limit for passive recovery use for an appliance containing HCFCs or HFCs?

A

Maximum charge of 15 pounds.

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14
Q

What are good maintenance practices for recovery equipment?

A

Checking for refrigerant leaks and oil leaks on a regular basis.

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15
Q

What is an acceptable method for monitoring that the fill level in a recovery tank does not exceed 80%?

A

A refrigerant scale or tank internal float device.

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16
Q

What must be able to recover 90% of the refrigerant when compressor is operating?

A

Self-contained recovery devices, for use with small appliances containing CFCs, HCFCs, HFCs, and HFOs.

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17
Q

What else can a self-contained recovery device for small appliances be able to achieve?

A

A 4-inch vacuum under the conditions of AHRI 740.

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18
Q

When a compressor is inoperable what must the recovery equipment for the purpose of disposal of refrigerants from small appliances be able to recover?

A

80% of the refrigerant or achieve a 4-inch vacuum.

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19
Q

How can refrigerant recovery devices used to recover CFCs, HCFCs, HFCs, HFOs be closed?

A

Either manually or automatically closed when disconnected to prevent loss of refrigerant from hoses.

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20
Q

When should hoses with manual or self-sealing valves on the ends be used to minimize the release of refrigerant?

A

When attaching a gauge set to check system pressures.

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21
Q

When must the refrigerant that is vented off the top be recovered?

A

When filling a charging cylinder with a regulated refrigerant.

22
Q

When can a vacuum pump used for system dehydration be used as a recovery device?

A

It may be used to evacuate a recover cylinder.

23
Q

When can a vacuum pump used for system dehydration not be used as a recovery device?

A

It cannot be used in combination with a pressurized recovery cylinder or vessel for recovery.

24
Q

What is Hydrocarbon (HC) R-600a an approved refrigerant for?

A

New household refrigerators, freezers, and combination refrigeration/freezers.

25
Q

What are Hydrocarbon refrigerants not approved for?

A

Retrofit into existing household refrigerators designed for refrigerants other than hydrocarbons.

26
Q

What has approved R-290, R-450A, and R-600a refrigerants for newly manufactured household refrigerators?

A

New SNAP regulations.

27
Q

When is it NOT mandatory to repair a leak, but recommended to do so whenever possible?

A

When servicing a small appliance.

28
Q

Do you need to prevent the mixing of refrigerants during recovery?

A

Yes, always.

29
Q

Is it acceptable to mix refrigerants in an appliance or recovery cylinder?

A

No, Never.

30
Q

What refrigerant generally does not need to be recovered?

A

R-744, carbon dioxide CO2, a very high pressure refrigerant.

31
Q

Why should you clearly mark recovery vessels?

A

To ensure that mixing of refrigerants does not occur.

32
Q

When only are comparisons to a pressure-temperature chart valid to check for contaminated refrigerant?

A

If both the pressure and temperature of the refrigerant are stable and known.

33
Q

When must a technician allow temperature of the cylinder to stabilize to room temperature before taking a pressure reading for comparison using a PT chart?

A

When checking for non-condesnables inside a recovery cylinder containing one refrigerant.

34
Q

What if you suspect a refrigerant is contaminated in a recovery cylinder?

A

A pressure measurement should be taken and compared to a pressure-temperature chart.

35
Q

What if the pressure-temperature relationship between a recovered refrigerant inside a cylinder and the PT chart does not match?

A

The recovered refrigerant should be turned into a reclamation facility.

36
Q

Why may some reclamation facilities refuse or charge extra to process or destroy recovered refrigerant?

A

It may be harder to accept mixed refrigerants.

37
Q

What is typically used on small appliances that is entered using a piercing access valve to add or remove refrigerant?

A

A straight piece of tubing called a service aperture or process stub.

38
Q

What should be done after installing any type of access fitting onto a sealed system but before recovery?

A

The fitting should leak tested.

39
Q

What kind of valves should be removed from the system after repairs are completed?

A

Solderless type piercing valves because they tend to leak overtime.

40
Q

What can capture refrigerant in a non-pressurized container?

A

A passive, system dependent, recovery process for small appliances.

41
Q

When is it essential to take measures to help trapped, regulated refrigerant from the compressor oil during recovery?

A

When using passive recovery devices on small appliances with non-operating compressors.

42
Q

What is helpful when recovering refrigerants into a non-pressurized container from a small appliance with a non-operative compressor?

A

It is helpful to heat (with a heat gun) and strike the compressor with a rubber mallet.

43
Q

Where in the system may refrigerant get trapped?

A

It may be trapped under the oil in the compressor crankcase.

44
Q

When must the high and low side of the system be accessed for refrigerant recovery?

A

When using the system-dependent (passive) recovery process and the compressor does not run.

45
Q

Why should both high and low side access valves be installed during passive recovery on a small appliance (refrigerator)?

A

To improve the speed of recovery.

46
Q

How do you, after passive recovery, ensure that all CFC, HCFC, and HFC refrigerant has been removed from a frost-free refrigerator?

A

Energize the defrost heater to increase the refrigerant’s temperature and vaporize any liquid.

47
Q

What requires only one access valve on the high side of the system during passive recovery?

A

An appliance with an operating compressor and a completely restricted capillary tube or metering device.

48
Q

What if a pungent oder is detected from the refrigerant during a system recovery and or repair?

A

It normally indicates a compressor burn-out.

49
Q

Why can a very large refrigerant leak cause suffocation?

A

Refrigerants are heavier than air and can displace oxygen.

50
Q

What can CFC and HCFC refrigerants decompose into at high temperatures?

A

Phosgene gas, hydrochloric acid, and/or hydrofluoric acid.

EPA Sec608 (4 decks)

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