Core
An ozone molecule is made up of blank
What is 3 oxygen atoms
When filling a charging cylinder with a refrigerant, the refrigerant that is vented off the top
What is must be recovered
The evaporation temperature of R-410a at 130 psig is
What is 45 degrees fahrenheit
If using a recovery machine after this date you must evacuate the unit to 0 psig
When is November 15, 1993
During chiller evacuation water is circulated to prevent
What is the freezing of water
How many microns are needed to reach dehydration?
What is 500 microns
The process of removing refrigerant from an appliance and storing it in an external container
What is recovery
If an appliance with 50 or more pounds of regulated refrigerant has exceeded the threshold leak rate, the equipment owner or operator has
What was the CFC phase out date?
When is December 31,1995
What requires purge units because they operate below atmospheric pressure
Low pressure chillers
A refillable refrigerant cylinder must never be filled more than what percent of its capacity by weigh
What is 80%
If a technician suspects that the refrigerant in a recovery cylinder to be contaminated, what should be done?
What is, the technician should check pressures and compare it to the PT chart
When under a deep vacuum the motor winding of a hermetic refrigeration compressor will be damaged if
What is energized
As of what date is it illegal to vent Class I and CLass II refrigerants into the atmosphere?
When is July 1st 1992
What is a 25 mm og Hg absolute
____ Values are used for charging by suction or evaporator superheat
What is Dew Point (Vapor)
When retrofitting or converting a system to use a different refrigerant, only what can be used?
What is only EPA-approved substitutes (Remember there is no such thing as a "drop-in" substitute.
What is the charge per year when used for industrial process refrigeration?
What is 30%
As of January 1st, 2019, what is the applicable maximum leak rates of a commercial refrigeration system?
What is 20% of the charge per year
If a chiller with a charge of 200 pounds of an ozone depleting refrigerant has passed the initial verification leak test, a follow-up verification test must be conducted within ___
What is 10 days
A single chlorine atom can last in the stratosphere for ____ years and destroy upto _____ ozone molecules?
What is 120
What is 100,000
When using a passive system dependent recovery process you should access both the high and low side of the system for the refrigerant recovery if
What is when the compressor is not energized
What is the required level of recovery for a high pressure appliance?
What is 10" Hg
What date was the sale of CFC's and HCFC's restricted to technicians in refrigerant recovery?
When is November 14,1994
When recovering equipment from a low pressure chiller, to what should it be heated in temperature as less refrigerant will be contained in the oil at higher temperatures?
What is 130 degrees