HVAC EPA
As of 2017, how much can a technician be fined for violating the clean air act, including knowingly releasing non-exempt refrigerant from appliances.
$44,539 per day per violation
Before making a major repair, technicians must evacuate an appliance or component containing more than 200 lbs of R-410A to which of the following levels?
10 inches of HG vacuum
A chiller for comfort cooling that contains 50 lbs or more of R123 is leaking. Starting in 2019, at what leak rate does the EPA require that the equipment be required?
10%
Starting in 2019, EPA regulations require that all chillers containing more than 50 lbs of ozone- depleting refrigerant that are used for comfort cooling be repaired when the leak rate exceeds;
10% of the charge per year
What is the maximum allowable factory charge of refrigerant for Type 1 appliances using CFCs, HCFCs, or HFCs?
15 lbs
What is the maximum normal charge of HCFC or HFC refrigerant in an appliance that is allowed to use system dependent recovery equipment?
15 lbs
System-dependant devices may only be used on appliances containing;
15 lbs of refrigerant
A rupture disk for low pressure chiller will rupture at
15 psig
The date when the production and import of new R-22 in the U.S. ends is?
2020
How long must a technician evacuating from appliances with a full charge of more than 5 lbs and less than 50 lbs that are being disposed of keep records of the event?
3 years
How long must a technician evacuating refrigerant from appliances with a full. charge of more than 5 lbs and less than 50 lbs that are being disposed of keep records of the event?
3 years
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;
30 psig
Industrial process and refrigeration units with a 50 pound charge or more with an annualized leak rate of _____ or more must have leaks repaired.
30%
The stratosphere is located ___ to ___ miles above sea level
7 to 30
R-123A at n14.7 PSIA boil at approximately:
82 F
Which of the following is and indicator of a leak in a high pressure system with a capillary tube?
Excessive superheat
What is a typical advantage of a water cooled recovery unit?
Faster recovery of large quantities of refrigerant
Which type of refrigerant typically has the lowest global warming potential?
HFO's
Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants?
HFOs
Self-contained or active recovery equipment;
Has its own means of recovery
Non-condensables will cause;
High discharge pressure
What is the state of the refrigerant leaving the receiver in a refrigeration system?
High pressure liquid
What will non- condensable in a refrigeration system result in?
Higher discharge pressure
What acids can CFC and HCFC refrigerants decompose into a high temperatures (e.g. open flames, glowing metal surfaces, etc.)?
Hydrochloric and hydrofluoric acids
What effect will low ambient temperatures have on recovery?
Increase the recovery time
When an appliance containing 50 lbs or more of a regulated refrigerant leaks refrigerant at an annual rate of 125% or more, what more must be included on the leak inspection records submitted to the EPA?
Initial verification, verification tests and records of recovered refrigerant from equipment
Which of the following statements are true of recycling and recovery equipment?
It must be labeled as certified to meet EPA's requirements
how does the global warming potential of R-410A. compare to carbon dioxide?
Its thousands of times greater
What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?
Leak test and repair the chiller
How long must owners and operators of low-pressure chillers using HCFC refrigerant keep records of leak. inspections, initial verification, and follow-up verification tests?
Life of the appliance
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?
Life of the appliance
What is the primary water source for a water cooled recovery unit's condensing coil?
Local municipal water supply
What steps may be taken to prevent air accumulation into an idle low pressure refrigeration system?
Maintain system pressure slightly above atmospheric pressure
For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for recovery of CFCs, HCFCs, and HFCs?
A domestic refrigerator
For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for refrigerant recovery of CFCs, HCFCs, and HFCs?
A domestic refrigerator
EPA section rules require capture of 80% of the HCFCs and HFCs from a small appliance sealed system with a non operation compressor is technicians are using;
A system dependent process
How can you speed up the removal of the refrigerant charge from a system?
Cooling the recovery cylinder to lower its pressure
What are the characteristics of hydrofluoroolefins?
Non-ozone depleting and have a low global warming potential
The sale of CFC and HCFC refrigerants has been restricted to certified technicians since
November 14th, 1994
CFCs and HCFCs are ____ substances
ODP
Permanent safety markings are not required on which of the following areas on household refrigerator using HC refrigerants?
On the inside of the refrigerator door
The layer of the Stratosphere that protects us from excessive Ultra Violet radiation is comprised of;
Ozone
Which type of lubricants are HFO refrigerants miscible in?
POE lubricants
What must be done before shipping any used refrigerant in a cylinder?
Properly label the refrigerant container
Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE
Purchases of such equipment must be reported to the EPA
Which refrigerant has a GWP of "1"?
R-1233zd
Which of the following refrigerants is an HFO..
R-1234yf
New household refrigerators may be factory charged with any of the following refrigerants EXCEPT
R-404A
New household refrigerators may be factory charged with any of the following refrigerants, Except
R-404A
Which of the following is and approved substitute refrigerant for new household refrigerators, freezers, and combination refrigeration/ freezers?
R-600A
For what refrigerant is an equipment room refrigerant detector NOT required under ASHRAE standard 15 provided the mechanical ventilation system in the machinery room is run continuously?
R-717
What is the term for removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in any way.
Recovering
Recovery devices for use with small appliances containing CFCs, HCFCs, and HFCs must meet which of the following requirements?
Recovering 90% of the refrigerant when the compressor is operating or achieving a 4-inch vacuum under conditions of AHRI 740
If after installing a fitting for the purpose of recovering the appliances refrigerant, you find that the system pressure is 0 psig;
Recovery is not required
What is the center port on a three port manifold used for?
Recovery, evacuation, and charging
Which. of the following is and acceptable method or device presently used for monitoring the 80% fill level in a recovery tank?
Refrigerant scale or tank internal float device
Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from a unit with R-410A. What must be done before the R-410A refrigerant can be recovered/recycled?
Remove the R-22 from the recovery unit and change the filter
A chiller containing 150 lbs of HCFC refrigerant is leaking above the leak rate threshold. Unless granted additional time, what must be completed in 30 days?
Repair the appliance so that it leaks below the threshold and conduct the initial verification test.
When using a system-dependent recovery system on an appliance that has a non-operating compressor, the technician should;
Run the compressor and recover from the high side of the system
What steps should be taken before using a recovery unit to remove a charge
Service valve positions and recovery oil level should be checked, when applicable
What steps should be taken before using a recovery unit to remove a charge?
Service valve positions and recovery oil level should be checked, when applicable
Which of the following is NOT required to mothball an appliance (thereby extending the leak repair deadline)?
Shut down the appliance temporarily
What action must an owner/operator take if a supermarket system containing 50 lbs or more of R-22 leaks more than 125% of its full charge in a calendar year?
Submit a report to the EPA describing efforts to identify leaks and repair the appliance
What does ozone depletion potential measure?
The ability of a substance to destroy ozone in the stratosphere?
What should be done before transferring refrigerant to an empty cylinder.
The cylinder should be evacuated
What should be done before transferring refrigerant to an empty cylinder?
The cylinder should be evacuated
Where does refrigerant go after it leaves the purge unit of a low-pressure centrifugal system?
The evaporator
When filling a charging cylinder with a regulated refrigerant;
The refrigerant vapor that is vented off the top of the cylinder must be recovered
Why do chillers using low-pressure refrigerants require purge units?
These systems operate below atmospheric pressure.
Why should long hoses between the unit and the recovery machine be avoided?
They cause excessive pressure drop and increased recovery time
Which of the following is a reason to heat a system during dehydration?
To decrease dehydration time
Why should low and high side access valves be installed when recovering refrigerant from a household refrigerator?
To prevent oil migration
When first inspecting a hermetic system known to be leaking, you should look for;
Traces of oil
What may be done to speed the recovery process and ensure that all CFC,HCFC, or HFC refrigerants has been removed from a frost free refrigerator>
Turn on the defrost heater to increase the refrigerant's temperature and vaporize any liquid
How many access valves are needed to recover the refrigerant on a sealed system with an operating compressor that has a completely restricted capillary tube?
Two valves, one on the high and one on the low side of the system
Refrigerants CFC R-12, HCFC R-22, and HFC 134a are all classified as;
Type A-1
When transporting cylinders containing used refrigerants, DOT requires you...
Use OSHA approved containers, Ship by EPA certified carrier, attach DOT classification tags
Refrigerant will migrate to a compressor crankcase when there is a difference between crankcase pressure and what characteristics of the refrigerant?
Vapor pressure
Which condition requires accessing both the high and low side of the system for refrigerant recovery when using the system-dependent (passive) recovery process?
When the compressor does not run
Which of the following additions of refrigerant, when added to an appliance that contains 50 or more pounds of an ozone depleting refrigerant, trigger the requirement to calculate a leak rate?
When topping off a system
A chiller with a charge of 200 lbs has passed the initial verification leak test. When must a follow-up verification test be conducted?
Within 10 days
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?
Within 10 days
EPA section 608 rules require capture of 80% of the HCFCs and HFCs from small appliance sealed systems with non operating. compressor if technicians are using;
a system dependent process
Refrigerant cannot be recovered without isolating a parallel compressor system because of
an open equalization connection
Applying heat with a heat gun to the compressor;
can help vaporize any trapped liquid refrigerant during recovery.
Refrigerant recovery and/ or recycling equipment manufactured after November 15, 1993 must be...
certified and labeled by an EPA approved equipment testing organization
When using a self-contained (active) recovery device on a CFC, HCFC, or HFC system with an operating compressor, a technician must;
either recover the refrigerant to 4 inches or mercury vacuum or 90% of the nameplate charge
The condenser changes a ______ pressure vapor to a _______ pressure liquid
high, high
Pressure relief valves can only be installed
in parallel
After recovering refrigerant, the Nirtogen used to flush the system may be:
legally vented
After recovering refrigerant from a sealed system, if nitrogen is used to pressurize or blow debris out of the system, the nitrogen;
may be vented to the ambient air
The system dependent (passive) recovery process:
recovers refrigerant in a non-pressurized container.
An operating unit that has a receiver/storage tank requires refrigerant system service. When servicing the unit
refrigerant should be pumped down to and isolated in the receiver
It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. however, it;
requires a pressure regulator
it is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. However, it;
requires a pressure regulator
Propane (R-290) and isobutane (R-600) are examples of ASHRAEs safety classification ___
A3
Which type of lubricants of HFO refrigerants miscible in?
AB lubricants
What synthetic lubricant is presently used with ternary blends containing HCFC's?
Allkylbenzene
When transporting cylinders containing used refrigerant, DOT requires the you:
Attach DOT classification tags
Refrigerant should be removed from the condenser outlet if the condenser is
Below the receiver