When recharging a low-pressure system, you should allow enough ____________ to enter the system until the refrigerant saturation temperature increases to _______degrees before introducing liquid refrigerant.

EPA regulations require that all chillers containing 50 or more pounds of ozone-depleting refrigerant that are used for comfort cooling be reparied when the leak rate exceeds___________percent fo the charge per year.

Charging liquid R-245f refrigerant into a low-pressure refrigeration system under ___ mercury vacuum can cause the system water to freeze.

The leak rate threshold for comfort cooling appliances with a full charge of 50 pounds or more of HCFC refrigerant is _________%.

The purpose of a hydrostatic tube test is to:

In low pressure chillers, the most frequent route of moisture entry is:

On a centrifugal system chiller, the rupture disc connects to the:

Removal of refrigerant oil at high temperatures (_____F) will result in less refrigerant being contained in the oil.

The ________is particularly susceptible to leaks in low-pressure chillers with open-drive type compressors.

Excessive running of a purge system on a low pressure chiller generally indicate that the refrigeration system is:

Before disposing of a low-pressure appliance technicians must recover refrigerant to an evacuation level of _________.

A technician servicing low pressure appliances must be certified under:

ASHRAE standard _____________requires that each machinery room activate an alarm and mechanical ventilation system when the TLV-TWA is exceeded.

__________is a SNAP approved replacement for low-pressure centrifugal compressor systems.

Under Standard 34 R-123 falls under group _________.

Select one:

According to _______________, if the pressure in a system rises from 1mm of Hg. To a level above 2.5 mm of Hg. During a standing vacuum test, the system should be checked for leaks.

In an average 350 ton R-11 chiller, at 0 psig, once all the R-11 liquid refrigerant has been removed, the system still contains about _______lbs. of refrigerant vapor.

The rupture disk on a recovery vessel for low pressure refrigerant releases at:

When setting up for vapor removal, which of the following do you NOT need to do?

Purge venting rupture disks and purges must be vented:

During a chiller refrigerant recovery process, you should:

Replacement of an evaporator coil is always considered a:

A rupture disc on an R-11 chiller will relieve at ______psig

R-11 & R-123 recovery should always be started with _________removal.

HCFC R-123 is a ______class refrigerant.

The _________is the lowest access point on a low-pressure centrifugal air conditioning appliance.

A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold.  The repair must be completed within ___days unless granted additional time.

In order to determine a chillers normal charge for leak rate calculations the best method would be to:

Under EPA regulations, the replacement of a _______________would always be considered a major repair.

After evacuating a system for a repair, wait at several minutes to see if pressures rise...a rise in pressure would indicate:

A typical advantage of using a water cooled recovery unit will be ____________recovery of large quantities of refrigerant.

Set the recovery units cutout for _________psig on a low-pressure system recovery unit.

Pressure relief valves must not be installed in_____________.

ASHRAE Standard 15-2013 requires the use of room sensors and alarms to detect refrigerant leaks for safety groups:

The primary purpose of a purge unit on an R-11 chiller is to:

On a centrifugal system, the purge device removes _______from the refrigerant

 _________refrigerant will be contained in oil at a higher temperature.

The EPA considers which of the following refrigerant a low-pressure refrigerant?

During evacuation of a system containing large amounts of moisture, it may be necessary to prevent freezing by increasing pressure using __________.

_________should be used to remove ice from sight glasses or viewing

Industrial process refrigeration with ozone-depleting refrigerant to be repaired when the leak rate exceeds _____% of the charge per year.

When you are recovering oil from a low pressure system and you want to expedite the process, it will be to your advantage to remove the oil:

According to the EPA, when you are charging a refrigeration system with R-12, you need ______-inches of mercury vacuum in the shell before charging with liquid refrigerant.

R-1233zd is______________

Owners and or operators of low-pressure chillers using HCFC refrigerants are responsible for keeping records of leak inspections, initial verification, and initial follow-up verification test for __________.