Type 3 Flashcards
What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?
A. Leak test and repair the chiller.
B. Seal the purge unit discharge line.
C. Pipe purge unit back into the low side.
D. Pipe purge unit back into recovery unit.
A. Leak test and repair the chiller.
Leak testing a low pressure refrigeration system with nitrogen in excess of 10 psig could cause which of the following to fail? A: CONDENSER TUBES. B: PURGE UNIT SHELLS. C: EVAPORATOR D: Rupture Disc
D: Rupture Disc
What precaution should be taken prior to recovering refrigerant from a chiller suspected of having tube leaks
A. Drain the water sides of the evaporator and condenser
Industrial process refrigeration when the leak rate exceeds
D: 30%
What must a system owner do once the threshold leak rate has been exceeded on any low pressure system using an ozone depleting refrigerant?
D: Repair the applicance enough to bring the leak rate below the threshold, retrofit, or retire the applican
passed the initial verification leak test, when must a follow-up verification test be conducted
C: within 10 days
A typical setting for the high pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low pressure chiller is
C: 10 psig
Refrigenant removal from a low-pressure system starts with
B: Liquid removal
Why should the oil be removed from a low-pressure system at 103’F
B: Less refrigenant will be contained in the oil at the higher temperature
A rupture disc on a recovery vessel for low-pressure refrigeants relieves at
C: 15psig
What is the result of raising the tempurature of the room in which a low-pressure chiller is located?
B: Faster refrigerant recovery
What is a typical advantage of a water cooled recovery unit?
Faster recovery of large quantities of refrigerant
Charging liquid R-245fa into a low-pressure refrigeration system under a vacuum greater than 18 inches. Hg vacuum can cause the
C: System water to freeze
Which of the following statements is true for recycling and recovery equipment?
It must be equiped with low-loss ball valves and flare fittings
to pressurized an R-1233zd system for the purpose of opening the system for a non-major repair?
Warming the liquid refrigerant in the system
What evacuation level must technicians recover refrigerant to before disposing a low-pressure applicane?
25mm of Hg absolute
require purge unit
These system operate below atmospheric pressure
reason to take oil sample
the unit has had a compressor burnout
prevent freezing by increasing pressure using a gas such as
Nitrogen
Pressure relief valves must NOT be installed
In series
which of the following statements about R-1233zd is FALSE
It is SNAP approved replacement for low-pressure centrifugal systems
Continuous excessive moisture collection in the purge unit of a low-pressure refrigeration system could indicate what condition?
The condenser or the chiller barrel tubes are leaking
ASHRAE Guideline 3, check for leak
1 mm Hg to 2.5mm Hg
Chillers belong to which EPA leak repair category
Comfort colling
