Air Conditioning

Front 1

Ozone in the stratosphere above the earth consist of Molecules containing?

Back 1

3 oxygen atoms

Hint 1

Atoms

Front 2

Each chlorine atom in the stratosphere can destroy how many ozone molecules?

Back 2

100,000

Front 3

Which atom of the CFC molecule causes ozone depletion?

Back 3

Chlorine

Hint 3

Swimming pool water

Front 4

Why are CFCs more like to reach the stratosphere than most other compounds?

Back 4

CFCs neither dissolve in water not break down into compounds that dissolve in water

Front 5

What had forms the earth's protective shield?

Back 5

Stratospheric ozone

Front 6

What refrigerant is most dangerous to the ozone?

Back 6

CFC

Front 7

What is being done to stop damage of the stratospheric ozone layer?

Back 7

Canoeing and eliminating chlorofluorocarbons

Front 8

What are violations of the clean air act?

Back 8

1.Falsifying/failing to keep records

2. Failing to reach required evacuation levels before opening or disposing of appliances

3. Knowingly releasing CFC or HCFC refrigerants into the air

Front 9

Some state and local governments may establish laws that?

Back 9

Follow the clean air act/EPA regulations or contain stricter regulations

Front 10

Before you dispose of any appliances containing a CFC or HCFC refrigerant, you must?

Back 10

Recover the refrigerant

Front 11

Violations can result in?

Back 11

1. Fine

2. Lose certification

3. Appear in federal court

Front 12

A reward of _____ may be paid to a person supplying information that leads to penalty against a tech who is intentionally venting wrong

Back 12

10,000

Front 13

Blended refrigerants leak from a system

Back 13

At uneven rates than other refrigerants

Front 14

R-13a refrigerant charged systems should be leak checked with?

Back 14

Pressurized nitrogen

Front 15

The state of the refrigerant leaving the condenser is?

Back 15

High pressure liquid

Front 16

Refrigerant entering the compressor is?

Back 16

Superheated vapor

Front 17

Cleaning refrigerant for immediate reuse?

Back 17

Recycling

Front 18

Most effective leak detection test?

Back 18

Electronic or ultrasonic

Front 19

Recovering during low temperatures will?

Back 19

Slow recovery process

Front 20

Factors effecting speed of evacuation?

Back 20

Size of equipment

Ambient temperature

Amount of moisture in system

Front 21

When should PPE be worn?

Back 21

Handling and refilling cylinders

Front 22

When pressurization a refrigeratoration system with nitrogen what rule should you always follow?

Back 22

Change through pressure regulator

Front 23

When transporting cylinders a ____ _______ tag must be attached

Back 23

DOT classification

Front 24

EPA include what in the definition of a small appliance?

Back 24

Products manufacturered, charged and hermetically sealed in a factory.

5lbs or less of refrigerant

Front 25

If EPA regulations change after a tech is certified

Back 25

Tech certification is grandfathered in for one year to allow time for re-certification.

A new test must be taken

Front 26

All recovery devices manufactured before November 15, 1993 for use with small appliances must meet what requirements?

Back 26

Capable of recovering 80% of the refrigerant whether or not the compressor is operating or achieving a 4" vacuum under conditions of ARI 740

Front 27

Small appliance recovery equipment manufactured after November 15, 1993 must be certified to be capable of?

Back 27

Recovering 90% of the refrigerant when the compressor is operating or achieving a 4" vacuum under conditions of ARI 740

Front 28

Techs receiving a passing grade on this small appliance examination are certified to recover refrigerant during the maintenance service or repair of?

Back 28

Packaged terminal air conditioners with 5lbs or less of refrigerant

Front 29

Recovery equipment used during maintenence service or repair of small appliances must be certified by an EPA approved lab if manufactured after?

Back 29

November 13, 1993

Front 30

Equipment manufactured after November 15, 1993 which is used to recover refrigerant from small appliances for the purpose of disposal must meet what standard?

Back 30

Recover 90% of the refrigerant with an operative compressor

Recover 80% of the refrigerant with an inoperative compressor

Front 31

When checking non-condensables inside a recovery cylinder why should the tech allow the temperature to stabilize to room temperature before taking a reading?

Back 31

Comparisons to a pressure-temperature chat ate only valid if both the pressure and temperature ate stable and known

Front 32

When recovering refrigerant into a non pressurised container from a refrigerator worth an inoperative compressor

Back 32

It is nessesary to heat the compressor and strike it with a rubber mallet

Front 33

The system-dependent (passive) recovery process for small appliances

Back 33

Captures refrigerant in a non-pressurized container

Front 34

When filling a graduated cylinder refrigerant that is vented off the top of the cylinder must be

Back 34

Recovered

Front 35

When R-500 is recovered from an appliance it?

Back 35

Must be recovered into its own vessel that is clearly marked

Front 36

Using the system dependent (passive ) recovery process which condition requires the access both high and low side of the system for refrigerant recovery?

Back 36

When the compressor doesn't run

Front 37

When a house hold refrigerator compressor does not run it is recommended that low and high side access valves be installed when recovering refrigerant from the system

Back 37

It can enhance recovery speed and may be nessesary to achieve required recovery efficiency

Front 38

At high temperatures R12 & R 22 can decompose to form?

Back 38

hydrochloric and hydrofluric acid

Front 39

When using recovery cylinders and equipment with Schrader valve it is crucial to?

Back 39

Inspect core for breakage and bends

Replace core to prevent leak

Cap ports to prevent accidental depression of valve core

Front 40

If a large leak of refrigerant occurs such as from a filled cylinder in an enclosed area what action should be taken with no breathing apparatus available?

Back 40

Vacate and ventilate area

Front 41

Sale if CFC and HCFC is restricted to techs with?

Back 41

EPA certified in recovery

Front 42

A storage cylinder of recovered R-22 at normal room temp in the absence of non-condensables will be pressurized to?

Back 42

130 psig

Front 43

Maximum allowable charge of refrigerant for type 1 appliances

Back 43

15 lbs

Front 44

Refrigerant in large quantities can cause suffocation because?

Back 44

Heavier than air and displace oxygen

Front 45

What refrigerant must be recovered with equipment currently regulated by the equipment certification requirements of the EPA under section 608?

Back 45

R-12

Front 46

The system dependent (passive) recovery process recovers refrigerant in a?

Back 46

Non-pressurized container

Front 47

At high temperatures R-12 and R-22 can decompose to form?

Back 47

Phosgene gas

Front 48

Before beginning a refrigerant recovery procedure it is always nessesary to?

Back 48

Know the type of refrigerant that goes into the system

Front 49

When first inspecting a hermetic austen known to be leaking you should look for?

Back 49

Traces of oil

Front 50

Which part of the compressor is most likely to leak if a unit is not used for several months?

Back 50

Rotating shaft seal

Front 51

All appliances containing more than 50 lbs of refrigerant (except for commercial and industrial process refrigerant) be repaired when the leak rate exceeds ____ prevent of the charge per year.

Back 51

15

Front 52

In general what is one routine maintenance task which most br preformed on most refrigerant recycling machines

Back 52

Change oil and filter

Front 53

You can save time recovering the refrigerant from the system by removing as much as possibles in the _____ phase

Back 53

Liquid

Front 54

Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover refrigerant from a unit with R-22. What must be done before the R-22 refrigerant can be recovered/recycled?

Back 54

Recover as much R-502 from the recovery unit as possibles, change filter and evacuate

Front 55

Worth a air cooled condenser on the roof of a building and the evaporator on the first floor recovery should first occur from?

Back 55

From the liquid line entering the evaporator

Front 56

Guage hosea used dope field service work should have self sealing connectors pure hand valves in order to?

Back 56

Minimize refrigerant release when hoses are connected

Front 57

When using recovery and recycling equipment manufactured after November 15, 1993, techs must evacuate an appliance component containing more than 200 lbs of CFC-12 to the following level before making making major repairs

Back 57

15" of hg vacuum

Front 58

After reaching the required recovery vacuum on an appliance, you should?

Back 58

Wait a few minutes to see if the austen pressure rises. Indicating that they're is still refrigerant in liquid form ore in the oil

Front 59

When using recovery and recycling equipment manufactured before November 15, 1993 techs must evacuate an appliance containing 10 lbs of CFC-500 on the following level before disposing of the appliance.

Back 59

0 psig

Front 60

What would be considered a major repair?

Back 60

Removal of any or all of the compressor, condenser, evaporator, or an auxiliary heat exchanger coil

Front 61

Appliances containing CFC refrigerants can be evacuated to atmospheric pressure when?

Back 61

Leaks in the appliance make evacuation to the prescribed level unattainable

Front 62

You are changing out the compressor of a system containing 40 lbs of R-502. Your recycling equipment was manufactured after November 15, 1993. In addition to isolating the compressor as much as possible, what procedure would you follow?

Back 62

Evacuate the isolated section of the system to 10" of vacuum and hold if system pressie does not rise, remove the compressor

Front 63

Recovering refrigerant from a system in vapor form phase will minimize loss of?

Back 63

Oil

Front 64

Any time you open the system replace _____

Back 64

Dryer

Front 65

Saddle clamps are not a permanent fix for a ____?

Back 65

Leak

Front 66

System requires a 30" vacuum or ____ microns?

Back 66

500

Front 67

If coil freezes up the system is?

Back 67

Low on freon or coil is clogged

Front 68

Too much freon makesnthe cooling capacity go?

Back 68

Down

Front 69

There should be a __ degree difference between supply and return

Back 69

15

Front 70

You need a positive shut off valve within __ inches of end of hose

Back 70

12

Front 71

______ pressure could mean air in system

Back 71

High discharge

Front 72

Relieving system of freon with king pin valve

Back 72

Pump down

Front 73

Only charge when system is running on low side in?

Back 73

Vapor form

Front 74

What color are recovery tanks?

Back 74

Grey and yellow

Front 75

When would i ever invert a recovery tank?

Back 75

Never

Front 76

Outside system is matched with?

Back 76

Coil

Front 77

If pressie is too high or low

Back 77

Bad valves or expansion valve is stuck open

Front 78

How do you find a leak on high side?

Back 78

Oil deposits

Front 79

Only charge you can vent in atmosphere

Back 79

Test charge

Front 80

Always check ___ in vacuum

Back 80

Oil

Front 81

Always open ___ side first

Back 81

High

Front 82

Changed state to high pressure liquid coming out of condenser

Back 82

Sub-cooled liquid

Front 83

Done ever operate ____ under vacuum

Back 83

Compressor

Front 84

Stores excess refrigerant and maintains liquid flow to device

Back 84

Liquid reservoir

Front 85

What could cause head pressure?

Back 85

Air in system or bad metering device

Front 86

Vacuums can only suck ____ out of unit

Back 86

Air

Front 87

Length, size, and temperature of lines effect the ____ of vacuum

Back 87

Speed

Front 88

R-12

Back 88

CFC

Front 89

R-134A

Back 89

HFC

Front 90

R-22

Back 90

HCFC

Front 91

Which refrigerant is a replacement for CFC?

Back 91

None

Front 92

A Guage reading 30/30 means?

Back 92

Low on freon

Front 93

When do you vent?

Back 93

Never

Front 94

Where will oil show up if you have a leak in system?

Back 94

High side

Front 95

Suction pressure

Back 95

Low side

Front 96

Head pressure

Back 96

High

Front 97

What is vapor charging method?

Back 97

Charge on low side while running and upright

Front 98

After charging system using manifold guages, the refrigerant must be?

Back 98

Recovered

Front 99

Before transferring recycled refrigerant into an empty storage cylinder the cylinder should be?

Back 99

Evacuated

Front 100

All refrigeratoration systems must be protected by a?

Back 100

Pressure relief valve

Front 101

An operating unit that had a receiver/storage tank requires refrigerant system service. When servicing unit refrigerant should be recovered by the?

Back 101

Receiver

Front 102

Refrigerant should be removed from the condenser out let when?

Back 102

The condenser is below the receiver

Front 103

When leak testing a low pressie centrifugal with nitrogen, what is the max test pressure?

Back 103

10 psig

Front 104

Charged low pressure refrigeratoration machines may be mossy efficiently leak checked by?

Back 104

Raising system pressie by heading with circulated hot water

Front 105

Appliances containing 50lbs or more of refrigerant (except commercial and industrial process) be repaired when the leak exceeds ___ of the charge per year

Back 105

15

Front 106

Typical setting for the high pursue cut-out control on a recovery unit is used for evacuating the refrigerant Ferron a low pressure chillier is?

Back 106

10 psig

Front 107

R-11 or R-123 system refrigerant removal starts with?

Back 107

Liquid removal

Front 108

With a low pressure chiller what must you do after recovering the liquid refrigerant?

Back 108

Recover vapor

Front 109

When removing oil from low pressure system, the temperature should be 130 degrees F because?

Back 109

Less refrigerant will be contained in the oil ay a higher temp

Front 110

If the pressure in a system rises fob 1mm hg to a level above __ during a standing vacuum test the system should be checked for leaks.

Back 110

2.5mm hg

Front 111

Why is vape reintroduced to the refrigerating system before liquid?

Back 111

Liquid charged into deep vacuum will boil and may lower temperature enough to freeze water in tubes

Front 112

Appliances need not be evacuated all the way to the prescribed level when?

Back 112

Leafless in the appliance make evacuation to the prescribed level unattainable

Front 113

When reaching the required recovery vacuum on a appliance you should?

Back 113

Wait a few min to see if the system pressure rises, indicating there is still refrigerant in liquid form or in oil