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EPA > EPA 608 Flash > Flashcards

EPA 608 Flash Flashcards

1
Q

Under EPA’s regulations, which of the following methods can be used to pressurize a system for the pupose of opening the system for non-major repairs?

A

Controlled Hot Water

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2
Q

For what refrigerant is an equipment room refrigerant sensor required under ASHRAE standard 15?

A

HCFC-123

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3
Q

A low pressure chiller using CFC-11 as refrigerant has been shut down and has an evaporator pressure of 18.1” Hg. What is the corresponding temperature?

A

32 degrees F

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4
Q

In a refrigeration system utilizing a thermal expansion valve, the component directly following the condenser is the:

A

Evaporator

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5
Q

Required level of evacuation for recovery equipment manufactured before November 15, 1993, on a system with a CFC-12 charge of less than 200 pounds is:

A

0 in. Hg

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6
Q

The MOST IMPORTANT reason why you should NEVER heat a refrigeration container of any kind with an open flame is

A

Internal hydrostatic pressure may cause the tank to explode, causing serious injury or death

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7
Q

What is the proper method for charging blended refrigerants?

A

Charge exact weight of liquid refrigerant into the high side of the system

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8
Q

The majority of the liquid to be recovered from a system will be found in the:

A

Receiver (when applied)

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9
Q

System vacuum level is measured with the:

A

System isolated

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10
Q

Recovery of refrigerant from a low-pressure system using the “push-pull” method removes what from the chiller?

A

Liquid

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11
Q

What is the “push-pull” method?

A

Recovers large amounts of liquid refrigerant by connecting liquid line system to liquid line recovery and suction line system to suction line tank, and a connection then made from the discharge outlet of recovery unit back to the system.

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12
Q

State the condition of the refrigerant entering the compressor:

A

Low-pressure vapor

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13
Q

When shipping non-flammable compressed gases, DOT requires which of these items to be recorded on the shipping papers?

A

Number of cylinders of each gas

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14
Q

To work on small appliances after Nov. 14, 1994, technicians must be certified as:

A

Type I, not Type I and Universal

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15
Q

When using a recovery and recycling equipment BEFORE Nov. 15, 1993, techs must evacuate an appliance containing 10 pounds of CFC-500 to the following level before disposal:

A

4in. Hg Vacuum

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16
Q

Since when it has been illegal to knowingly release refrigerants during the service, maintenance, repair or disposal of refrigerated appliances:

A

1-Jul-92

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17
Q

The most common refrigerant used by low-pressure chillers has been CFC-11. The current replacement for CFC-11 is a HCFC, which is:

A

HCFC-123

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18
Q

The what of refrigeration machines having a refrigerant charge of 50lbs or more must keep records of refrigerant added to each machine.

A

Owners, not technicians

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19
Q

EPA defines what as an applieance that uses a refrigerant with a boiling point below -50 degrees C at atmos pressure. This definition includes, but not limited to, equipment utilizing CFC-13, R-503:

A

Very High-Pressure Appliances

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20
Q

The only refrigerant approved by the EPA to be used as a trace gas with nitrogen to test for a leak - except for systems using HFC-134a - is:

A

HCFC-22

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21
Q

What type of refrigerants are R-32, R-125, R-134a, R-143a

A

HFC

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22
Q

What type of refrigerants are R-22, R-123, R-124

A

HCFC

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23
Q

What type of refrigerants are R-11, R-12, R-113, R-114, R-115

A

CFC

24
Q

What is the difference between classification of high-pressure and low-pressure refrigerants?

A

Boiling point below 50 degrees F are High Pressure. 50 degrees and above are Low Pressure

25
Q

What is the boiling point of a Very High Pressure Refrigerant?

A

Very High-Pressure is -50 degrees C

26
Q

When was the 100 percent ban on production of CFC’s?

A

1/1/1996

27
Q

When was the HCFC freeze at baseline consumption?

A

1/1/1996

28
Q

When are HCFC’s being reduced by 35 percent?

A

1/1/2004

29
Q

When are HCFC’s being reducted by 65 percent, only made for old machines?

A

1/1/2010

30
Q

When are HCFC’s being reduced by 90 percent?

A

1/1/2015

31
Q

What is the significance of 1/1/20?

A

Reduction of HCFC production by 99.5 percent.

32
Q

When will HCFC be reduced by 100 percent?

A

1/1/2030

33
Q

When was the Montreal Protocol meeting?

A

Sep-87

34
Q

When was the CAA Section 608 enacted into law in the U.S.?

A

1990

35
Q

When was venting of CFC and HCFC’s prohibited legally?

A

July 1, 1992

36
Q

When was venting HFC’s made illegal?

A

November 15, 1995

37
Q

What is the replacement for CFC-12? Is it a drop in?

A

HFC-134a. No.

38
Q

What is one replacement for HCFC-22? Is it a drop in?

A

HFC-410A

39
Q

Evacuation standards for machines before and after 11/15/1993 for HCFC-22 or component below 200lb?

A

0 in. Hg and 0 in. Hg

40
Q

Evacuation standards for machines before and after 11/15/1993 for HCFC-22 or component over 200lb?

A

4 in. Hg and 10 in. Hg

41
Q

Evacuation standards for machines before and after 11/15/1993 for other high-pressure equipment or component below 200lb?

A

4 in. Hg and 10 in. Hg

42
Q

Evacuation standards for machines before and after 11/15/1993 for other high-pressure equipment or component over 200lb?

A

4 in. Hg and 15 in. Hg

43
Q

Evacuation standards for machines before and after 11/15/1993 for very high-pressure equipment?

A

0 in. Hg and 0 in. Hg

44
Q

Evacuation standards for machines before 11/15/1993 for other low-pressure equipment?

A

25 in. Hg and 25 mm. Hg

45
Q

What does ASHRAE Guideline 3-1990 state?

A

If pressure in system increases 1mm Hg to above 2.5mm Hg during vacuum testing, must leak check system

46
Q

What are the most common refrigerants found in chiller rooms today?

A

CFC-11 orange, HCFC-123 light grey, CFC-113 purple

47
Q

What does ARI-700 require?

A

Reclaimed refrigerant must be returned to virgin-like state before resale

48
Q

Name Low-Pressure refrigerants:

A

CFC-11, 113, and HCFC-123

49
Q

Name High-Pressure refrigerants:

A

CFC-12, 114, 500, 502, and HCFC-22

50
Q

What does ASHRAE 15 require?

A

Requires oxygen-deprivation sensors and emergency venting in equipment machine rooms for all refrigerants

51
Q

What does ASHRAE 34 describe?

A

Standards for Flamability and Toxicity of refrigerants

52
Q

An average low-pressure chiller requires about 3 pounds of refrigerant per ton. The large amount of liquid refrigerant involved is removed more quickly:

A

By a special liquid pump from the evaporator into the recovery vessel

53
Q

HFC-134a is classified as a ________ under ASHRAE 34 safety group.

A

A1

54
Q

After isolating a portion of the system that is leaking, what pressure must the isolated portion be brought to before starting a major repair?

A

The lowest attainable level.

55
Q

How many valve are in the centrifugal compressor?

A

0

56
Q

What will the evaporator temperature of CFC-11 be at vapor pressure of 13.1psig?

A

110 degrees F

57
Q

At what temperature will CFC-11 be at under a pressure of 13.1 psig?

A

110 degrees

EPA (3 decks)

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