WorksheetsEPA 608 Type 2
Total questions: 79
Worksheet time: 40mins
A chiller for comfort cooling that contains 50 pounds or more of R-123 is leaking. Starting in 2019, at what leak rate does the EPA require that the equipment be repaired?
5%
10%
15%
20%
A cold storage warehouse chooses not to repair an appliance containing R-22 that is leaking above the threshold rate. How long can the facility continue to operate that appliance before it must be retrofitted or retired, assuming no extensions apply?
1 month
9 month
12 month
24 month
A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification test?
1 days
10 days
30 days
45 days
A company uses a chiller that diverts 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. Which leak rate category would this chiller be in?
Industrial process refrigeration
Ice making refrigeration
Commercial refrigeration
Comfort cooling
A customer has an industrial process refrigeration system that contains 1000 lbs. of R-22 that has exceeded the applicable leak rate threshold. How often is the customer required to perform a leak inspection?
Every month
Every 3 month
Every 6 month
Every 12 month
After a leak repair of a supermarket rack using 3000 lbs of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted?
The same day.
The next day.
Within 10 days.
Within 30 days.
After installation of a field piped split system, the unit should first be pressurized with;
air and leak checked.
R-22 and leak checked.
R-410A and leak checked.
nitrogen and leak checked.
After refrigerant liquid has been recovered from the appliance, any remaining vapor is;
purged to the atmosphere.
isolated in the appliance.
pumped into appliance receiver.
removed by the recovery system.
An initial leak verification test failed after repairing a leak in a rack refrigeration system for a supermarket using an HCFC refrigerant. What would be the next step(s)?
Immediately retrofit or retire the appliance.
Conduct additional repairs within the 30-day repair window or mothball the appliance.
Conduct a follow-up verification test.
Report the amount of refrigerant added to the system to the EPA.
An operating unit that has a receiver/storage tank requires refrigerant system service. When servicing the unit;
the compressor should be valved off.
liquid refrigerant should be recovered last.
refrigerant should be pumped down to and isolated in the receiver.
a gauge pressure of "0"psi should be achieved by venting.
Before making a major repair, technicians must evacuate an appliance or component containing more than 200 pounds of R-410A to which of the following levels?
0 psig
25 mm Hg absolute
10 inches of Hg vacuum
15 inches of Hg vacuum
During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with gas such as;
R-410A.
R-22.
Air.
Nitrogen.
Every refrigerating system must be protected by which of the following?
A pressure relief device.
A properly located stop valve.
A low pressure control.
A refrigerant receiver.
For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE Standard 15 provided the mechanical ventilation system in the machinery is run continuously?
R-134a
R-404A
R-410A
R-717
How can you speed up the removal of the refrigerant charge from a system?
Using a smaller recovery vessel.
Cooling the recovery cylinder to lower its pressure.
Using a two-stage vacuum pump.
Heating the recovery cylinder to raise its pressure.
How long do owners or operators of an appliance with a full charge of 50 or more pounds of ozone depleting refrigerant have to retire an appliance if the replacement uses a refrigerant that is exempt from the venting prohibition?
3 months
6 months
12 months
18 months
How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 pounds?
1 year
3 years
5 years
10 years
How long must owners and operators of regulated appliances normally containing 50 or more pounds of HCFC refrigerant keep records of leak inspections, initial leak verification and follow-up verification tests?
2 years
3 years
5 years
Life of the appliance
How would you remove moisture from refrigerant in a system?
Purge the condenser.
Drain the oil separator.
Reduce water flow to the condenser.
Use a filter drier.
Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds.
Vapor charge through the suction service valve.
Liquid charge through the discharge service valve.
Liquid charge through the suction service valve.
Liquid charge through the liquid-line service valve.
It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. However, it;
often contains moisture.
requires a minimum of 10 psig.
is toxic when released into the atmosphere.
requires a pressure regulator.
Liquid charging of an R-410A refrigeration system with risk of freezing is begun with vapor from a vacuum level to a pressure of approximately;
32 psig.
63 psig.
90 psig.
110 psig.
Pressure relief valves can only be installed;
in series.
in parallel.
vertically.
horizontally.
Recovered refrigerant may contain which of the following impurities?
Ammonia, carbon dioxide, and methyl chloride
Sodium chloride, potassium nitrate, and silicone oil
Sulphur dioxide and methane
Acids, moisture, and oil
Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following?
Water
Oil
Refrigerant
Non-condensables
Refrigerant cannot be recovered without isolating a parallel compressor system because of;
the service valve connection.
the electrical connections.
an open equalization connection.
the thermal bleed connection.
Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder, in order to replace the condenser coil. The refrigerant;
may be charged back into the system.
may be sold as is to another equipment owner.
must be reclaimed.
must be destroyed.
Starting in 2019, what leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired?
10%
20%
30%
35%
To avoid freezing the water contained in a water-cooled heat exchanger of an R-134a refrigeration system during charging, the system should be initially charged with R-134a vapor to a pressure of approximately;
0 psig.
10 psig.
30 psig.
90 psig.
To determine if the system is leaking more than the allowable rate, the EPA allows the use of which one of the following methods to determine the full charge?
Use of the calculations based on power consumption, in kWh.
Use of the calculations based on compressor horsepower
Use of calculations based on component and pipe sizes.
Use of the calculations based on the BTU capacity of the system.
What action must an owner/operator take if a supermarket system containing 50 or more pounds of R22 leaks more than 125% of its full charge in a calendar year?
Retrofit the appliance with a substitute refrigerant.
Recover the refrigerant and leak check the appliance with a trace gas.
Retire the appliance until it can be replaced with a new one.
Submit a report to EPA describing efforts to identify leaks and repair the appliance.
What are refrigeration and air-conditioning compressor heaters used for?
To reduce the amount of refrigerant in the oil.
To prevent refrigerant vaporization.
To reduce the amount of entrained water in the receiver.
To prevent acid pitting.
What area of a refrigeration system does oil foaming usually occur?
Condenser
Evaporator
Compressor
Expansion device
What can happen when using a large vacuum pump to evacuate a system?
Trapped oil can freeze.
Trapped refrigerant can freeze.
Water in system can freeze.
The valve seats can freeze.
What is a deep vacuum usually measured in?
Psig
Psia
Inches of Hg
Microns
What is a moisture indicating sight glass useful for?
Determining the type of refrigerant.
Checking for moisture in refrigerant.
Providing sub-cooling.
Determining the type of oil used.
What is the approximate refrigerant pressure in an R-134a refrigerator, when it has been off for a long time and the room temperature has been maintained at 80°F?
87 psig
158 psig
219 psig
300 psig
What is the best use for testing with soap bubbles?
To pinpoint refrigerant leaks.
To find refrigerant leaks in coil fin area.
To detect leaks in water tube condensers.
To detect leaks if the condenser is excessively dirty.
What is the component directly following the condenser in a refrigeration system using a thermal expansion valve?
Receiver
Compressor
Accumulator
Evaporator
What is the easiest way to check the type of refrigerant used in a 60-ton packaged rooftop unit?
Look at the unit nameplate.
Use your service gauge set and a PT chart.
Ask the owner.
Measure the condenser pressure
What is the evaporation temperature of R-134a at 0 psig?
-21°F
-15°F
-5°F
-1°F
What is the first thing to do when a new system has been assembled {built up), and is ready for testing?
Pull a vacuum.
Pressurize with an inert gas and leak check.
Pressurize with the refrigerant to be used in the system.
Introduce an initial charge of refrigerant and start the compressor.
What is the primary water source for a water cooled recovery unit's condensing coil?
Chilled water from the evaporator
Condenser water
Local municipal water supply
De ionized water
What is the state of the refrigerant leaving the receiver in a refrigeration system?
Low pressure liquid
Low pressure vapor
High pressure liquid
High pressure vapor
What level of vacuum should be pulled when evacuating a vapor compression system to ensure all moisture has been removed?
2 mm Hg.
1 mm Hg.
1000 microns.
500 microns.
What must an owner of a commercial refrigeration appliance with a charge of 2000 pounds of R-22 do once the leak rate threshold has been exceeded?
Take further action by repairing, retiring, mothballing, or retrofitting the appliance.
Check to see if it has leaked above the mandatory retirement threshold.
File a report to EPA describing their efforts to repair the appliance.
Retrofit the appliance to an exempt substitute refrigerant.
What should be done after reaching the required recovery vacuum on an appliance?
Immediately disconnect the recycling or recovery equipment, and open the system for service.
Wait for at least a few minutes to see if the system pressure rises.
Break the vacuum with nitrogen and open the system for service.
Pressurize the system with nitrogen and perform a leak check.
What should be done before transferring refrigerant to an empty cylinder?
The refrigerant should be chilled.
The refrigerant should be mixed.
The cylinder should be heated.
The cylinder should be evacuated.
What should be used to remove ice from sight glasses or viewing glasses?
Non-scratching abrasive pad
lsopropyl alcohol
Water
Torch
What should systems that use R-407C be leak checked with?
Any available CFC.
Any available HCFC.
Pressurized nitrogen and a trace amount of R-407C.
Pressurized nitrogen and a trace amount of R-22.
What steps should be taken before using a recovery unit to remove a charge?
The refrigerant should be tested for acid.
The recovery is unit should be purged with nitrogen.
The recovery unit oil should be changed and recovery cylinder evacuated.
Service valve positions and recovery oil level should be checked, when applicable.
What will back-seating a suction shutoff valve close?
Suction line and compressor port
Compressor and gauge port
Compressor port
Gauge port
What will non-condensables in a refrigeration system result in?
Lower suction pressure
Higher suction pressure
Lower discharge pressure
Higher discharge pressure
What would be the approximate refrigerant pressure of an R-410A machine at (80°F) room temperature while the machine is idle?
143 psig
212 psig
236 psig
260 psig
When a trace gas becomes absolutely necessary, which of the available gases should be used to help locate a leak?
Nitrogen with HCFC R-22.
R-22 due to its universal system compatibility and its miscibility with various oils.
Nitrogen with a trace amount of the system's design refrigerant.
Nitrogen with HFC R-410A.
When can appliances containing refrigerants be recovered to atmospheric pressure?
For major repairs such as replacing the compressor, condenser, or evaporator.
The repair is followed by an evacuation of the appliance to the environment.
Leaks in the appliance make recovery to the prescribed level unattainable.
The appliance is being disposed of and recycled.
When could a reciprocating compressor be damaged if energized?
When the discharge service valve is closed.
When the suction service valve is open.
When the discharge service valve is open.
When the demand for cooling is at a steady state
When first inspecting a hermetic system known to be leaking, you should look for;
frost on the tubing.
puddles of refrigerant.
particles of filter drier core.
traces of oil.
1. When is it against EPA regulations to use system-dependent recovery equipment?
When the compressor of the appliance is operational.
When the ambient temperature is over 105°F.
When the appliance contains over 15 pounds of refrigerant.
When the appliance is leaking.
When recovery is first started, at what phase is the refrigerant removed to save recovery time?
Recovery phase
Recycle phase
Liquid phase
Vapor phase
When should refrigerant be removed from the condenser outlet?
When the condenser is below the receiver.
When the condenser is on the roof.
When the condenser is inoperative.
When the evaporator has a small leak.
When under a deep vacuum, the motor winding of a hermetic refrigeration compressor;
could be damaged if energized.
must be kept warm to operate properly.
will be protected by its insulation if the compressor is started.
will overheat only if the crankcase heater is energized.
Where must you connect a hose in order to recover liquid refrigerant?
compressor suction valve.
compressor discharge valve.
liquid line.
condenser inlet.
Which leak repair category does the EPA define as the refrigeration appliances used in the retail food and cold storage warehouse sectors?
Commercial refrigeration
Industrial process refrigeration
Comfort cooling
Ice making refrigeration
Which of the following additions of refrigerant, when added to an appliance that contains 50 or more pounds of an ozone-depleting refrigerant, triggers the requirement to calculate the leak rate?
Following a retrofit.
During the installation of a new appliance.
When using a qualified seasonal variance.
When topping off the system.
Which of the following CANNOT be used as a reason to extend the appliance repair deadlines?
Requirements of federal, state, or local regulations make the repair within 30 days impossible.
A necessary component is not available.
The appliance is located in an area that is subject to radiological contamination.
A certified service technician is not available.
Which of the following components is located after the evaporator?
Receiver
Liquid line drier
Accumulator
Condenser
Which of the following is a reason to take an oil sample?
A new filter drier has been installed.
The unit has had a compressor burnout.
The unit is not cooling properly.
Recycled refrigerant has been added to the unit.
Which of the following is an indicator of a leak in a high-pressure system with a capillary tube?
High head pressure
Low water temperature
Excessive superheat
Frequent purging
Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)?
Shut down the appliance temporarily
Remove the appliance and store it in a warehouse at the facility
Recover the refrigerant from the isolated section or component
Recover refrigerant from the appliance to at least atmospheric pressure
Which of the following refrigerants would be used in a low-pressure appliance?
R-22
R-123
R-410A
R-407A
Which of the following repairs would always be considered "major" under EPA's regulations?
Replacement of an evaporator coil.
Replacement of a filter-drier.
Replacement of a Schrader valve core.
Replacement of a condenser fan motor.
Which of the following should be replaced if a system is opened for servicing?
Filter drier
Thermostat
Metering devic
Crankcase heater
Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE?
It must be tested by an EPA-approved third party
Purchases of such equipment must be reported to the EPA
It must be equipped with low-loss fittings
Equipment designed to recover flammable refrigerant must meet a specific UL safety standard
Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months?
Suction service valve
Rotating shaft seal
One or both of the king valves
Head gasket on discharge side
Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums?
It runs faster than other equipment with oil less compressors.
The motor relies on the flow of refrigerant through the compressor for cooling.
It has a higher compression ratio limit than other equipment.
The oils used in hermetic compressors are a lower viscosity than the oils used in other equipment.
Why do gauge set hoses used for field service work have self-sealing connectors or hand valves?
To minimize the chance of an explosion during refrigerant recovery.
To prevent vapor lock during vapor transfer to recovery cylinder.
To minimize refrigerant release when hoses are connected and disconnected.
To prevent vapor lock during liquid transfer to recovery cylinder.
You are changing out the compressor of a system containing 40 pounds of R-404A. In addition to isolating the compressor, which of the following procedures should you follow?
Simply remove the compressor and cap the ends.
Evacuate the isolated section of the system to atmospheric pressure, then remove the compressor.
Evacuate the isolated section of the system to 0 psig and if system pressure does not rise after a few minutes, remove the compressor.
Evacuate the isolated section of the system to 5 inches of vacuum and when the system's pressure rises out of the vacuum, remove the compressor.
Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from an R-410A unit. What must be done before recovery?
Change the recovery cylinder on the recovery machine.
Change the expansion valve on the recovery machine.
Change the filter and expansion valve on the recovery machine.
Remove the R-22 from the recovery unit and change the filter.
