EPA Type II Flashcards
(25 cards)
For a belt driven non-hermetic compressor system, the _________ is most likely to leak if the system has not been operated for several months.
A. Head gasket.
B. Shaft seal.
C. King valves.
D. Filter dryer.
B. Shaft seal
_________ indicates low charge in a high-pressure system with a capillary tube.
A. Low superheat.
B. Low sub cooling.
C. Excessive superheat.
D. Excessive vibration.
C. Excessive superheat
To determine the system charge for leakage rate calculations, the EPA allows the use of calculations based on _________.
A. Compressor current draw.
B. Power usage.
C. Component and pipe sizes.
D. Refrigeration or cooling capacity.
C. Component and pipe sizes
A comfort cooling appliance containing 60 pounds of refrigerant has a significant leak (leaking beyond the applicable leak rate threshold). You have _________ to repair the leak and perform a successful initial leak verification test.
A. 15 days.
B. 30 days.
C. 45 days.
D. 120 days.
B. 30 days
When beginning recovery, it is fastest to remove the refrigerant as a ___________.
A. Vapor.
B. Mixture.
C. Liquid.
D. The state of the refrigerant does not affect the recovery rate.
C. Liquid
Recovering refrigerant as a vapor minimizes the removal of ___ from the system.
A. Moisture.
B. Acid
C. Oil
D. Non-condensables
C. Oil
After all the liquid refrigerant has been recovered from a system, the remaining vapor ____________/
A. Must be purged to the atmosphere.
B. Can be vented or recovered
C. Left in the system if it is being discarded.
D. Must be removed by the recovery system to the required evacuation level.
D. Must be removed by the recovery system to the required evacuation level.
________ will speed up recovery
A. Using a smaller recovery tank.
B. Cooling the recovery tank.
C. Heating the recovery tank.
D. Cooling the system.
B. Cooling the recovery tank
A hermetic compressor will overheat if operated in a vacuum because ___________.
A. It runs fast faster when operated in a vacuum.
B. The compressor motor uses the flow of refrigerant through the compressor for cooling.
C. The oil has lower lubricity when exposed to a vacuum.
D. Offgassing of acid from the oil causes the compressor to overheat.
B. The compressor motor uses the flow of refrigerant through the compressor for cooling.
You have a recovery machine certified for both R-407C and R-410A with R-410A refrigerant in it. You now have to recover refrigerant from A R–407C unit. What must be done before beginning the R–407C recovery?
A. Nothing has to be done to the recovery unit, but you must change the recovery cylinder to one that holds R-407C.
B. Nothing, it is a dual refrigerant machine and both refrigerant are alternatives to R-22.
C. Change the filter on the recovery machine.
D. Remove the R-410A from the recovery unit (and hoses), change the filter dryer, and change the recovery cylinder to an R-407C cylinder
D. Remove the R-410A from the recovery unit (and hoses), change the filter, dryer, and change the recovery cylinder to an R-407C cylinder
During the TXV repair, refrigerant was recovered from the system. The refrigerant __________.
A. Can be charged back into the same system after repairs are made if the system is leak checked and properly evacuated.
B. Can be sold, because it is probably OK.
C. Must be reclaimed because it was a major system repair.
D. Must be destroyed because it was a major system repair.
A. Can be charged back into the same system after repairs are made if the system is leak checked and properly evacuated.
A system with a large liquid receiver needs a major system repair to replace a faulty TXV. When servicing the unit ________.
A. The compressor should be isolated.
B. The liquid refrigerant should be recovered last.
C. The refrigerant should be recovered to or isolated in the receiver.
D. The refrigerant in the liquid receiver can be vented.
C. The refrigerant should be recovered to or isolated in the receiver.
EPA approved recycling and recovery equipment must __________.
A. Be tested by an EPA approved, third-party and have a label verifying it meets EPA requirements
B. Be equipped with low loss fittings.
C. Be certified for use with the refrigerant being recovered or recycled.
D. All of the above.
D. All of the above
You are changing out the compressor of a system containing 40 pounds of R-404A, you must ___________.
A. Isolate the compressor, vent the refrigerant in the compressor to 0 psig, and remove the compressor
B. Isolate the compressor, evacuate the isolated section of the system to 0 psig, and if the system pressure does not rise, after a few minutes, remove the compressor
C. Vent the refrigerant from the entire system, because the compressor is bad
D. Calculate the leak rate to be certain you don’t have a substantial leak before removing the compressor.
B. Isolate the compressor, evacuate the isolated sections of the system to 0 psig, and if the system pressure does not rise, after a few minutes, remove the compressor
After reaching the required recovery vacuum on a system, ________.
A. Immediately open the system before there is any more out-gassing
B. Wait at least a few minutes to see if the system pressure rises.
C. Break the vacuum with compressed air.
D. Purge the system with R-410A or R-134a to flush refrigerant from the oil
B. Wait at least a few minutes to see if the system pressure rises
You have to open an R-410A system with a normal charge of 250 pounds, to replace a compressor, you must evacuate the system to ________.
A. 0 PSIG.
B. 25 mm Hg absolute
C. 10 inches of Hg vacuum.
D. 15 inches of Hg vacuum.
C. 10 inches of Hg vacuum
If leaks in the system make the recovery to a required evacuation level unattainable or if reaching this level of evacuation would draw air into the recovered refrigerant, you are only required to recover down to a pressure of __________.
A. 10 psig
B. 5 psig
C. 0 psig
D. 5 inches of mercury
C. 0 psig
Which repair is always considered “ major system repair” under EPA‘s regulations?
A. Replacement of a condenser.
B. Replacement of a capacitor.
C. Replacement of a fan blade.
D. Replacement of an evaporator blower motor
A. Replacement of a condenser
It is against EPA regulations to use system dependent recovery unit when the ___________.
A. Normal charge of the system is more than 5 pounds.
B. Ambient temperature is over 95°F.
C. Appliance contains over 15 pounds of refrigerant.
D. Appliance has a leak.
C. Appliance contains over 15 pounds of refrigerant.
To determine the type of refrigerant used in a 90 ton package rooftop unit, ________.
A. Check the unit nameplate
B. Measure the saturation, temperature and pressure.
C. Measure the sub cooling.
D. Measure the super heat.
A. Check the unit nameplate
Oil foaming usually occurs in the _________.
A. Condenser.
B. Evaporator.
C. Compressor.
D. Expansion device.
C. Compressor
If a hermetic compressor is activated while under a deep vacuum, the ________.
A. Motor windings could be damaged.
B. The compressor oil foams.
C. The run capacitor is overloaded.
D. The compressor could seize due to lack of lubrication.
A. Motor windings could be damaged
An oversized vacuum pump can cause ________ during evacuation.
A. Refrigerant to freeze.
B. Water in the system to freeze.
C. Damage to the compressor inlet valve.
D. Damage to both the inlet and outlet flapper valves of the compressor.
B. Water in the system to freeze.
An equipment room refrigerant detector is not required under ASHRAE standard 15 to detect ________, but the ventilation system must operate continuously.
A. R-1234yf
B. R-22
C. R-410A
D. R-717
D. R-717
