EPA Type III Flashcards
(25 cards)
A hydrostatic tube test kit is used to __________.
A. Find if there is a leak in the tube
B. Flush water from the tubes.
C. Expand replacement tubes into the chiller core
D. Clean deposits from the water-side of the chiller.
A. Find if there is a leak in the tube.
The maximum test pressure for leak testing a low pressure centrifugal chiller is __________.
A. 2000 microns
B. 2500 microns
C. 10 psig
D. 35 psig
C. 10 psig
Moisture can enter a low pressure chiller from ________.
A. Air leaks in the purge unit.
B. A poorly seated rupture disc.
C. Leaks at gaskets, fittings, or shaft seals.
D. The moisture that off gas is from filter dryers
C. Leaks at gaskets, fittings, or shaft seals
Excessive operation of a purge system means _________.
A. The system is overcharged.
B. The purge system is going to fail soon.
C. The system has a leak on the sub-ambient pressure side of the system
D. The refrigerant is decomposing.
C. The system has a leak on the sub-ambient pressure side of the system
ASHRAE Guideline 3 states the chiller should be checked for leaks if during a standard vacuum test, the pressure in the system rises from 1 mm Hg to a level above ___________.
A. 500 microns
B. 2.0 psig
C. 2.5 mm Hg
D. 600 microns
C. 2.5 mm Hg
The EPA’s mandatory leak repair requirements apply to systems with a normal name plate charge of _______ pounds or more.
A. 5
B. 15
C. 30
D. 50
D. 50
If the threshold leak rate has been exceeded, the owner must __________.
A. Notify the EPA within 10 days of the actual measured significant leak rate
B. Repair the leak within 10 days.
C. Mothball the unit until the EPA provides instructions on whether to retire or replace the appliance.
D. Repair the appliance at least enough to bring the leak rate below the threshold, retrofit, or retire the appliance.
D. Repair the appliance at least enough to bring the leak rate below the threshold, retrofit, or retire, the appliance.
The EPA definition for the type of cooling that chillers usually provide is _______.
A. Industrial refrigeration.
B. Comfort cooling.
C. Process cooling.
D. Commercial cooling.
B. Comfort cooling
When must the leak rate be calculated?
A. When topping off or recharging a system due to a loss of charge.
B. When the system charges more than 50 pounds.
C. When you have topped off or changed the system at least twice in a calendar year.
D. When both A and B are true.
D. When both A and B are true
When working with low pressure systems, the high-pressure cut off should be set to no more than __________ to avoid damaging the system or activating the pressure blow off device (rupture disk).
A. 100 psig
B. 50 psig
C. 10 psig
D. 500 micron
C. 10 psig
According to the EPA, when all the R-123 liquid has been removed from an average 350 ton R-123 chiller and the system vapor pressure is 0 psig, the system contains _________.
A. Trace amounts of refrigerant, which does not need to be recovered.
B. Almost 10 pounds of refrigerant in the system.
C. 100 pounds of refrigerant in the system.
D. Oil that must be recovered.
C. 100 pounds of refrigerant in the system
The use of a severely oversized vacuum pump can cause _______.
A. Oil breakdown.
B. Refrigerant to decompose.
C. Trapped water to freeze.
D. Over evacuation.
C. Trapped water to freeze
The rupture discs on the low pressure chiller and on the recovery tank should relieve at __________ to prevent damage to the system during refrigerant transfer into or out of the system.
A. 500 microns
B. 10 psig
C. 15 psig
D. 25 psig
C. 15 psig
Water must be circulated through a chiller during refrigerant evacuation to avoid _________.
A. Acid buildup
B. Oil overheating.
C. Freezing of the water.
D. System isothermalization.
C. Freezing of the water
When charging a low pressure chiller, first introduced the refrigerant as a vapor until _______.
A. The system pressure reaches 10 PSIG
B. The saturation temperature of the refrigerant being charged increases above 32°F.
C. The system pressure reaches 15 psig
D. Either A or C
B. The saturation temperature of the refrigerant being charged increases above 32°F.
After reaching the required recovery vacuum, _______.
A. Immediately break the vacuum with nitrogen before the pressure rises.
B. Begin leak checking so the deep vacuum can help identify leaks
C. Wait a few minutes to see if the system pressure rises before opening the system up for repairs.
D. Immediately open the system for service.
C. Wait a few minutes to see if the system pressure rises before opening the system up for repairs.
Replacement of _________ is always considered “major” under EPA‘s regulations.
A. A condenser.
B. A compressor
C. And evaporator.
D. All of the above.
D. All of the above
When does the EPA allow you to not evacuate to the prescribed level?
A. When using a system dependent recovery unit with a failed compressor.
B. When the repair is minor and less than half of the charge will be vented.
C. When leaks in the appliance make evacuation to the prescribed level unattainable.
D. When the approved recovery unit cannot achieve, the EPA required evacuation level.
C. When leaks in the appliance make evacuation to the prescribed level unattainable.
Every recovery and recycling unit must be _________.
A. Test tested by AHRI.
B. Equipped with low loss flare fittings.
C. Able to handle more than one refrigerant
D. Labeled as certified to meet EPA’s requirements.
D. Labeled as certified to meet EPA’s requirements.
How can you pressurize a low pressure chiller to make a non-major repair?
A. Add nitrogen to the system.
B. Warm the system.
C. Add compressed air to the system.
D. All of the above our EPA approved methods
B. Warm the system.
When disposing a system with a normal charge of more than 5 pounds and less than 50 pounds, the disposal record must be kept by the technician for _________.
A. 18 months.
B. 3 years.
C. 30 months.
D. Five years.
B. 3 years
A purge unit is connected to the _______.
A. Evaporator inlet.
B. Top of the condenser.
C. Lowest point on the evaporator.
D. Oil equalization line.
B. Top of the condenser
At 23.8 in Hg, R-123 boils at approximately:
A. 3°F.
B. 15°F.
C. 48°F.
D. 74°F
B. 15°F.
ASHRAE standard 15 calls for the activation of an alarm and mechanical ventilation when the __________.
A. TLV-TWA is exceeded
B. UTL (upper threshold limit) is exceeded
C. Oxygen level drops below 16%.
D. EEL (emergency exposure limit) is exceeded by 10%
A. TLV-TWA is exceeded
