TYPE III EPA 608 Review Questions

What evacuation level must technicians recover refrigerant to before disposing of a low- pressure appliance

25 mm of Hg absolute

A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold. Unless granted additional time, what must be completed within 30 days?

Repair the appliance so that it leaks below the threshold and conduct the initial verification Test

Which of the following methods can be used to pressurize an R-123 system for the purpose of opening the system for a non-major repair?

Warming the liquid refrigerant in the system.

R-123 at a Pressure of 18,1 inches Hg vacuum has a saturation temperature of:

40°F

When should an appliance NOT be evacuated all the way to the prescribed

When leaks in the appliance make evacuation to the prescribed level unattainable.

How long must a technician evacuating refrigerant from appliances with a full charge of more than 5 pounds and less than 50 pounds, that are being disposed of, keep records of the event.

3 years

Which of the following statements is true of recycling and recovery equipment?

It must be labeled as certified to meet EPA requirements.

typical setting for the high pressure cut-out on a recovery unit used for evacuating the refrigerant from a low-pressure chiller is;

10 psig.

Starting in 2019, EPA regulations require that all chillers containing 50 or more pounds of ozone-depleting refrigerant that are used for comfort cooling be repaired when the leak rate exceeds;

10% of the charge per year.

What should you do after reaching the required recovery vacuum on a low-pressure appliance?

Wait for at least a few minutes to see if the system pressure rises before charging.

What is the best method to determine a chiller's normal charge for leak rate calculations?

Use the charge stated on the equipment nameplate.

After servicing, and recharging, why is refrigerant vapor re-introduced to the chiller before refrigerant liquid?

Liquid charged into a deep vacuum will evaporate and may lower the temperature, freezing water in the heat exchanger tube bundle.

ASHRAE Standard 15-2013 requires the use of room sensors and alarms to detect:

Refrigerant leaks.

Charged low-pressure refrigeration machines may be most efficiently leak checked by;

Adding heat with circulated hot water or heating blankets.

Where does refrigerant go after it leaves the purge unit of a low-pressure centrifugal

The evaporator

Which of the following indicates air in a low-pressure system?

High head pressure

Why should the oil be removed from a low-pressure system at 130°F?

Less refrigerant will be contained in the oil at the higher temperature.

When leak testing a low-pressure centrifugal with nitrogen, what is the maximum test pressure

10 psig

When should an appliance NOT be evacuated all the way to the prescribed level?

When leaks in the appliance make evacuation to the prescribed level unattainable.

Starting in2019, what is the leak rate threshold for comfort cooling appliances with a full charge of 50 or more pounds of an HFC refrigerant?

10%

What should be used to remove ice from the sight glasses or viewing glasses?

Isopropyl alcohol

If an owner or operator of an appliance with 50 or more pounds of an ozone-depleting refrigerant charge are required to retrofit or retire an appliance that has exceeded the threshold leak rate, how many months do they have if the replacement appliance uses a refrigerant exempt from the venting prohibition.

18 months

Where is refrigerant added to a centrifugal machine?

Evaporator charging valve

Which of the following is a reason to take an oil sample?

The unit has had a compressor burnout.

When evacuating a system, the use of a severely oversized vacuum pump could;

Cause trapped water to freeze.

ASHRAE Standard 15-2013 requires the use of room sensors and alarms to detect:

All refrigerant safety groups

Approximately how much refrigerant vapor is left in an average 350-ton R-123 chiller at 0 psig Once all the R-123 liquid has been removed?

100 pounds

A Hydrostatic tube test kit will;

Determine if a tube leaks.

Where does the purge unit on a centrifugal system take its suction?

Top of the condenser

Which of the following methods can be used to pressurize an R-123 system for the purpose of opening the system for a non-major repair?

Warming the liquid refrigerant in the system.

What is the primary purpose of a purge unit on a low-pressure chiller?

Remove non-condensables out of the system.

When leak testing a low-pressure centrifugal with nitrogen, what is the maximum test pressure?

10 psig

R-123 at 14.7 PSIA will boil at approximately:

82° F

Wha k reconsible for keeping records of all leak inspections and any completed leak repa

verifontion tests?

The owner eith operator of the equipment.

What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?

Leak test and repair the chiller

Refrigerant removal from a low-pressure system starts with;

Liquid removal.

What must be done after recovering the liquid refrigerant from a low-pressure chiller?

Recover the vapor refrigerant.

ASHRSE Guideline 3, the system should be checked for leaks if during a standard vacuum trae the pressure in the system rises from 1 mm Hg to a level above;

2.5 mm Hg.

Where is the lowest access point on a low pressure centrifugal air-conditioning appliance?

Evaporator charging valve.

What is a typical advantage of a water cooled recovery unit?

Faster recovery of large quantities of refrigerant.

Which of the following always falls under the EPA definition for "major maintenance, service or repair?

Replacing a compressor

Excessive running of a purge system on a low-pressure chiller generally indicates what condition?

Leaking system

When must the leak rate of an appliance using an ozone-depleting refrigerant be calculated?

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

How long must a technician evacuating refrigerant from appliances with a full charge of more than 5 pounds and less than 50 pounds that are being disposed of keep records of the event?

3 years

What is the typical design burst pressure for a rupture disk on a low-pressure centrifugal air-conditioning system?

15 psig

Why must water be circulated through a chiller during refrigerant evacuation?

To prevent freezing of the water in the appliance.

Refrigerant removal from a low-pressure system starts with;

Liquid Removal

Which of the following statements is true of recycling and recovery equipment?

It must be labeled as certified to meet EPA requirements

Why do chillers using low-pressure refrigerants require purge units?

These systems operate below atmospheric pressure.

What evacuation level must technicians recover refrigerant to before disposing of a low-pressure appliance?

25 mm of Hg absolute