Core

Question 1

Stratospheric ozone

Answer 1

Protective shield, ozone protects from ultraviolet radiation from the sun

Question 2

ODP

Answer 2

Ozone depletion potential measures the ability of a substance to destroy ozone in the stratosphere

Question 3

What negative effects result from ozone depletion?

Answer 3

Increased rates of skin cancer, cataracts and negative effects on the environment, resulting in decreased crop yields and damage to marine organisms 

Question 4

What is ozone made up of?

Answer 4

Three oxygen atoms

Question 5

How is an ozone molecule affected by chlorine?

Answer 5

The chlorine takes one of the ozone’s three atoms forming a compound, called chlorine monoxide (CIO). CIO collides with another ozone molecule, releasing its oxygen atom.

Question 6

A single chlorine atom can last in the stratosphere for _____ years and destroy up to ______ozone molecules

Answer 6

120 years destroying 100,000 ozone molecules

Question 7

Does the chlorine in CFCs and HCFCs breakdown into compounds that dissolve in water or rain out of the atmosphere?

Answer 7

NO

Question 8

GWP

Answer 8

Global warming potential. Established to provide comparisons of the global warming impacts of different gases over a span of time.

Question 9

What is used as a baseline measurement for global warming potential with a value of 1?

Answer 9

Carbon dioxide

Question 10

Which refrigerants have the lowest global warming potential?

Answer 10

Hydrocarbon (HC) and Hydrofluoroolefin (HFO)

Question 11

HFCs have a _______ global warming potential, making them damaging to the environment

Answer 11

Very high

Question 12

CFC

Answer 12

Chlorofluorocarbon. Highest ozone depletion potential. Examples: R-11 and R12

Question 13

HCFC

Answer 13

Hydrochlorofluorocarbon. Contains hydrogen, chlorine, fluorine, and carbon. The hydrogen makes them less harmful to stratospheric ozone

Question 14

HFC

Answer 14

Hydrofluorocarbon. Contain hydrogen, fluorine, and carbon atoms connected by single bonds. Lowest/no ozone depletion potential, but do have an effect on global warming

Question 15

HFO

Answer 15

Hydrofluoroolefin. Contain hydrogen, fluorine, and carbon atoms connected with at least one double bond between the carbon atoms. No ozone depletion potential, but do you have a very small effect on global warming

Question 16

HC

Answer 16

Hydrocarbon. Elementary compound of hydrogen and carbon. Although flammable, they post the least amount of danger to the environment considered natural refrigerants.

Question 17

Can propane cylinders for grilling be used as refrigerant?

Answer 17

No. They contain impurities that can damage refrigerant equipment. 

Question 18

Azeotropic

Answer 18

Refrigerant mixtures containing two or more refrigerant. Acts like a single or pure compound refrigerant

Question 19

Zeotropic

Answer 19

Mixtures of components that have different boiling points. Blend the refrigerant associated with temperature glide.

Question 20

Bubble point (liquid)

Answer 20

Values used when charging by condenser sub cooling

Question 21

Dew Point (vapor)

Answer 21

Values used for charging by suction or evaporator superheat

Question 22

How should zeotropic or near azeotropic blends of refrigerants be charged into the system?

Answer 22

By liquid

Question 23

Fractionization

Answer 23

Refrigerant leaking at uneven rates due to different vapor pressures

Question 24

What EPA approved refrigerant can be used as direct drop in replacements to service an R 22 or any other system?

Answer 24

The EPA does not approve any substitute refrigerants as direct drop in replacements

Question 25

When *retrofitting or converting* a system to use a different refrigerant only ______ substitutes can be used.

Answer 25

EPA-approved

Question 26

Low Pressure refrigerant

Answer 26

30 psig or lower at 104 degrees liquid phase. Example: R11, R123

Question 27

Medium Pressure refrigerants

Answer 27

Between 30 psig and 155 psig at 104 degrees liquid phase. Examples: R12, R134, R1234YF

Question 28

High Pressure refrigerants

Answer 28

Between 155 psig and 340 psig at 104 degrees liquid phase. Examples: R22, R410, R717

Question 29

Very High pressure refrigerants

Answer 29

Over 340 psig at 104 degrees liquid phase. Example: R744 CO2

Question 30

What type of oil does HCFC refrigerant blends use?

Answer 30

Synthetic alkylbenzene

Question 31

What type of oil does HFC refrigerants use?

Answer 31

Esther based oils; they are hydroscopic and absorb moisture

Question 32

Montreal Protocol

Answer 32

An international treaty, that addresses, ozone, depleting substances and their alternatives

Question 33

As of 2017, a technician can be fined $_________ a per violation for violating the Clean Air Act.

Answer 33

$44,539

Question 34

In what year is the phase out for the production and imports of newly manufactured R22 and HCFC142 in the US?

Answer 34

2020

Question 35

And what year will all HCFC refrigerants be phased out?

Answer 35

2030

Question 36

Reclaimed, refrigerant must meet what AHRI standard?

Answer 36

AHRI standard 700

Question 37

Technicians can only charge used CFC, HCC, or HFC refrigerants back into the ______appliance or another appliance belonging to the _______owner.

Answer 37

Same owner. Used refrigerant unless reclaimed cannot change ownership.

Question 38

Recovery equipment must be tested according to a AHRI standard _____?

Answer 38

AHRI 740

Question 39

When disposing of appliances with 50 to 50 pounds of refrigerant, what must records include?

Answer 39

-type of refrigerant -quantity of refrigerant, by type -Quantity recovered from dispose of appliances in each calendar month -Quantity of refrigerant, by type, sent for reclamation or destruction

Question 40

What type of refrigerant can be vented and does not require 608 certification?

Answer 40

Carbon Dioxide R744

Question 41

Can you top off a refrigerant system with another type of refrigerant?

Answer 41

No. This can void equipment warranty, ruin the refrigerant, damage, the equipment, and cause personal injury, or death.

Question 42

Recover

Answer 42

To remove refrigerant in any condition from the system and store it in an approved recovery cylinder container

Question 43

Recycle

Answer 43

To extract, refrigerant from an appliance and clean the refrigerant for use in equipment of the same owner without meeting the requirements for reclamation

Question 44

Recycling equipment must meet what AHRI standard?

Answer 44

AHRI 740

Question 45

Reclaim

Answer 45

To process refrigerant to a level equal to new “virgin” product. Must meet AHRI 700 standards

Question 46

System dependent (passive) recovery

Answer 46

Capture refrigerant with the assistance of components in the appliance from which refrigerant is being recovered (compressor etc)

Question 47

Self-contained (active) recovery

Answer 47

Has its own means to draw refrigerant out of the appliance. Example: recovery machine

Question 48

Low ambient temperatures or long hoses between the unit and recovery machine _________ recovery time

Answer 48

Increase

Question 49

What type of hoses should be used for the recovery of refrigerant?

Answer 49

Short as possible and large diameter hoses

Question 50

How should newly install systems be checked for leaks?

Answer 50

System should be pressurized with dry nitrogen for leak detection purposes. If any electronic leak detector is to be used, a trace refrigerant can be added along with dry nitrogen. Soap bubbles can pinpoint the leak.

Question 51

Evacuate to ______ microns

Answer 51

500 or lower

Question 52

Dehydration

Answer 52

Purpose is to remove water and water vapor from the system. Moisture and the system can cause hydrochloric and hydrofluoric acids to form.

Question 53

For accurate readings during system evacuation, vacuum gauge should be connected where in relation to the pump?

Answer 53

As far away from the vacuum pump as possible. Measuring final system, vacuum should be done with system, isolated and pump off.

Question 54

When pressurizing the system with nitrogen, you should always charge through a _________?

Answer 54

Pressure regulator and relief valve downstream from the regulator. If using multiple relief valves, they should be installed in parallel to each other.

Question 55

Recovery cylinders should be filled to no more than _____% of its capacity by weight 

Answer 55

80%

Question 56

A reusable container for refrigerant that is under high-pressure (above 15psig) must be hydrostatically tested every _____ years?

Answer 56

5 years

Question 57

Recovery tanks have ______bodies and ______tops

Answer 57

Grey bodies and yellow tops