Type 2 prep

Question 1

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

Answer 1

Type 2 or universal EPA certification.

Question 2

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

Answer 2

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

Question 3

What is classified by EPA as Commercial Refrigeration?

Answer 3

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

Question 4

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

Answer 4

When an appliance has a dual use.

Question 5

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?

Answer 5

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

Question 6

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

Answer 6

Use the charge stated on the equipment nameplate.

Question 7

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

Answer 7

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

Question 8

When can you calculate the leak rate of an appliance?

Answer 8

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

Question 9

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

Answer 9

Checking the nameplate.

Question 10

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

Answer 10

The system’s total charge.

Question 11

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

Answer 11

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

Question 12

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

Answer 12

All appliances using regulated refrigerants.

Question 13

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

Answer 13

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

Question 14

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

Answer 14

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

Question 15

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

Answer 15

Leak repair requirements.

Question 16

What is the maximum leak rate for comfort cooling?

Answer 16

10% of the charge per year.

Question 17

What is the maximum leak rate for commercial refrigeration?

Answer 17

20% of the charge per year.

Question 18

What is the maximum leak rate for Industrial process refrigeration?

Answer 18

30% of the charge per year.

Question 19

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 ?

Answer 19

30 days unless the EPA grants additional time.

Question 20

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

Answer 20

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

Question 21

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

Answer 21

Not having a certified service technician available.

Question 22

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

Answer 22

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

Question 23

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

Answer 23

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

Question 24

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

Answer 24

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

Question 25

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

Answer 25

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

Question 26

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

Answer 26

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

Question 27

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

Answer 27

Initial and follow-up verification tests of leak repairs.

Question 28

What must the verification tests demonstrate?

Answer 28

That leaks were successfully repaired.

Question 29

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

Answer 29

A follow-up verification test.

Question 30

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

Answer 30

Leak inspections or verification tests to owners/operators.

Question 31

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?

Answer 31

Every 3 months for one year after repair.

Question 32

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

Answer 32

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

Question 33

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

Answer 33

First pressurize with nitrogen and then check for leaks.

Question 34

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

Answer 34

When absolutely necessary.

Question 35

When should you look for traces of oil?

Answer 35

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

Question 36

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

Answer 36

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

Question 37

How do you best pinpoint refrigerant leaks?

Answer 37

Testing with soap bubbles.

Question 38

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

Answer 38

When the system operates with excessive superheat.

Question 39

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

Answer 39

Active recycling and recovery equipment for Type 2 refrigeration appliances.

Question 40

What must be determined before you recover refrigerant?

Answer 40

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

Question 41

When does the EPA prohibit passive recovery techniques?

Answer 41

When the system charge is greater than 15 pounds.

Question 42

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

Answer 42

Check the service valve positions and recovery oil level.

Question 43

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

Answer 43

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

Question 44

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

Answer 44

The recovered refrigerant.

Question 45

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

Answer 45

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

Question 46

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

Answer 46

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

Question 47

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

Answer 47

The equalization connections between compressors are closed.

Question 48

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

Answer 48

Recovery machines that utilize a water-cooled condenser.

Question 49

How do you reduce recovery time?

Answer 49

Connect one of the service hoses to the liquid line.

Question 50

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

Answer 50

Remove refrigerant from the condenser outlet.

Question 51

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

Answer 51

Recovering refrigerant in the vapor phase.

Question 52

When must HVAC service companies keep records for 3 years?

Answer 52

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

Question 53

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

Answer 53

Cooling the recovery cylinder by lowering its pressure.

Question 54

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

Answer 54

Heating the system.

Question 55

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

Answer 55

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

Question 56

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

Answer 56

It can become damaged if energized under a deep vacuum.

Question 57

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

Answer 57

0" Hg.

Question 58

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

Answer 58

0" Hg.

Question 59

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

Answer 59

10" hg.

Question 60

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

Answer 60

10" Hg.

Question 61

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

Answer 61

15" Hg.

Question 62

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

Answer 62

10 inches of Hg vacuum.

Question 63

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

Answer 63

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

Question 64

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

Answer 64

A high-pressure liquid.

Question 65

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?

Answer 65

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

Question 66

What is used for checking refrigerant for moisture?

Answer 66

A moisture indicating sight glass.

Question 67

Where is the sight glass located?

Answer 67

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

Question 68

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

Answer 68

The liquid-line filter drier.

Question 69

What is the filter drier's purpose?

Answer 69

To remove moisture from the refrigerant in the system.

Question 70

Where can accumulators be found?

Answer 70

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

Question 71

What is the purpose of an accumulator?

Answer 71

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

Question 72

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

Answer 72

back-seated position.

Question 73

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

Answer 73

Discharge valve should never be closed on operating compressor.

Question 74

How should multiple pressure relief valves be installed?

Answer 74

In parallel.

Question 75

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

Answer 75

Crankcase heaters.