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WorksheetsEPA Type III
Total questions: 80
Worksheet time: 41mins
What type of appliance can a technician work on with a Type III Certification?
Low pressure appliances such as chillers
Ice machines that fit under the counter
Convenience store refrigerators
High pressure appliances such as heat pumps
What do CFC-11, HCFC-123, HFC-245fa, and HFO-1233zd have in common?
They all contain chlorine
They are high pressure refrigerants that have high boiling points
They are low pressure refrigerants that have high boiling points
They are low pressure refrigerants that have low boiling points
Low pressure appliances operate...
As a high pressure system.
In a vacuum or below atmospheric pressure.
Above atmospheric pressure.
Where does the purge unit take its suction from?
The lowest point of the system
The top of the condenser
The bottom of the condenser
The evaporator charging valve
What is the pressure relief device on a low-pressure chiller called?
A purge unit
A rupture disc
A vent pipe
An evaporator valve
What is the boiling point of R-123 refrigerant at atmospheric pressure?
26 degrees F
- 15 degrees F
83 degrees F
0 degrees F
When charging a low pressure water chiller with R-123, charging begins with vapor, until what pressure is reached in the system?
0 "hg
18.9 "hg
84 psig
25 "hg
If the condensing temperature of a low pressure chiller is 100 degrees F, that means the high side pressure is:
6.1 "hg
83 psig
19 psig
6.1 psig
What can happen when a low pressure appliance has a leak at a fitting or gasket?
Water can spill from the system
Air and moisture can enter the system
refrigerant can leak from the system
The fitting or gasket can corrode and may need to be replaced
What do low pressure appliances require since they operate below atmospheric pressure?
A condenser
A pressure relief valve
A process stub
A purge unit
What is the most effective way to leak test a charged low pressure chiller?
Use controlled hot water or electric heating blankets to increase system pressure
Use cold water and ice decrease system pressure
Add nitrogen to the system
Use an open flame to speed up the system
Why should a technician NEVER add nitrogen to a charged low pressure appliance for the purposes of leak detection?
It will decrease the system pressure
It will mix with the refrigerants and oils in the system
It will result in inaccurate pressure readings
It will cause the purge unit to operate resulting in refrigerant loss
When pressurizing a low pressure appliance for the purpose of leak detection DO NOT exceed ____.
25 psig
17 psig
10 psig
30 psig
What happens when a low pressure system exceeds 10 psig and the rupture disk opens?
The system vents refrigerant
The system leaks oil
The moisture in the system is released
Nothing
What should be done if a purge unit that is operating excessively?
evaluate the refrigerant charge
pressurize the unit and leak test
check voltage to the purge unit
clean the units water tubes
Which of the following can be used to pressurize a charged, low pressure chiller for the purpose of leak detection?
nitrogen
R410a refrigerant
controlled hot water or heating blankets
running the compressor at full speed
What is used to leak test a water tube in a chiller?
refrigerant
hot water above 125 degrees F
hydrostatic tube test kit
standing vacuum test
To leak test the water box of a chiller, drain the water and place the leak detector probe in:
the evaporator charging valve
suction of the purge unit
one of the water tubes
the drain valve
As of 2019, a chiller used for comfort cooling needs to be repaired when the annual leak rate exceeds ____.
20% of the charge
10% of the charge
15% of the charge
30% of the charge
How long does an owner have to retrofit or retire a low pressure appliance that has exceeded the leak rate threshold?
24 months
4 months
18 months
6 months
How long does an owner have to repair a leaking low pressure appliance to below the leak rate threshold and get an initial verification test?
90 days
30 days
15 days
60 days
How long does the owner or operator need to keep leak inspection, leak repair verification test, and follow up verification test records?
3 years
13 years
20 years
5 years
Recovery equipment manufactured on or after November 15, 1993 must be capable of achieving a recovery level of ____.
45 mm Hg
25 mm Hg
35 mm Hg
30 mm Hg
When a leak in a low pressure appliance makes the required recovery level unattainable the appliance should be evacuated to ____.
10 psig
5 psig
25 psig
0 psig or atmospheric pressure
Why should all recovery equipment be fitted with low-loss fittings?
To minimize moisture from entering the system
To minimize oil loss when hoses are disconnected
To minimize refrigerant loss when hoses are disconnected
To minimize oxygen from escaping when hoses are disconnected
After the required level is reached on a low pressure appliance what can indicate that there is still refrigerant remaining in the system?
Moisture in the system
A rise in pressure after the recovery unit is turned off
Air in the system
A drop in pressure after the recovery unit is turned off
Refrigerant recovery on a low pressure appliance begins with ____.
Liquid removal
Oil removal
Vapor removal
Condensing
After recovering liquid refrigerant from a low pressure chiller what remains in the system?
Liquid refrigerant
No refrigerant
A substantial amount of vapor
Non-condensables only
What should be done with the remaining vapor in a low pressure appliance after the liquid has been recovered?
It is removed and condensed by the recovery unit
It is vented into ambient air
It stays in the compressor
It is left inside the appliance
What is the high-pressure cut out control typically set for on a recovery unit designed for recovering refrigerant from a low-pressure chiller?
5 psig
30 psig
10 psig
25 psig
Approximately how much vapor refrigerant would remain in a typical 350 ton, R-123 chiller after all the liquid refrigerant has been removed?
About 350 lbs of refrigerant
About 100 lbs of refrigerant
About 10 lbs of refrigerant
About 10,000 lbs of refrigerant
What should be on to prevent freezing, when recovering refrigerant from a low pressure chiller
the recovery unit compressor
all answers are correct
the recovery unit condenser water
the system water pumps
ASHRAE guideline 3 states that a low pressure chiller should be pressurized and leak tested, if during a standing vacuum test, the pressure rises from ____ to _____:
2.5 mm to a level above 25 mm
0 psig to 10 psig
29 inches mercury to 10 inches of mercury
1 mm to a level above 2.5 mm
If a chiller is suspected of tube leaks, what should be done prior to refrigerant recovery?
drain the water from the evaporator side of the system
drain the water from the condenser side of the system
repair the tube leaks
drain the water from both the evaporator and condenser sides of the system
Why is it important that prior to removing oil from a low pressure system, the oil be heated to 130 degrees F?
less refrigerant will be contained in the oil
to drive moisture and other contaminants from the oil
to ensure all oil is removed
the oil will flow more freely
When charging R 123 refrigerant into a low pressure chiller, charging should begin with vapor until what pressure is reached?
19.1 inches of mercury vacuum
25.9 inches of mercury vacuum
18.5 inches of mercury vacuum
20 inches of mercury vacuum
What is required by ASHRAE Standard 15 in each equipment room when the TLV-TWA (threshold limit value-time weighted average) is exceeded?
Fire sprinklers
Stationed technicians
An alarm and a mechanical ventilation system
Emergency recovery devices
On a low pressure chiller, where is refrigerant added?
the condenser charging valve
the liquid line king valve
the compressor suction valve
the evaporator charging valve
Which of the following must be accounted for in leak rate calculations?
adding refrigerant to a new system
adding refrigerant to a newly retrofitted system
topping off the system with refrigerant due to a leak
all answers are correct
What does ASHRAE require for all refrigerant safety groups?
A gauge manifold
Fire alarms
A purge valve
A refrigerant monitor
Which class of refrigerants has shown evidence of toxicity below 400 ppm?
Both Class B and C
Class B
Class C
What is the ASHRAE code classification for CFC-12, CFC-11, and HFC-134a?
B1 (toxic below 400ppm, non-flammable)
A1 (non-toxic, non-flammable)
A3 (low toxicity, highly flammable)
If more than one pressure relief device is used in a refrigeration system, how must they be piped in?
Parallel to each other
In series to each other
On a low pressure chiller, where should the vent pipe from the rupture disk lead to?
To the outdoors
Into the basement
Into an unoccupied room
Into the equipment room
Which of the following refrigerants is safety classified as a B1 refrigerant(high toxicity/low flammability)?
R 123
R 134a
R 11
R 22
Where is the rupture disc located?
on the purge unit
on the evaporator housing
on the condenser outlet
on top of the water box
Excessive moisture collection by the purge unit may indicate which of the following?
dirty condenser tubes
dirty evaporator tubes
tube leakage
shaft seal leak on compressor
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 _________.
18 months
3 years
30 months
5 years
How can you pressurize a low-pressure chiller to make a non-major repair?
Add nitrogen to the system
Warm the system
Add compressed air to the system.
All of the above are EPA-approved methods.
Every recovery and recycling unit must be _____________.
tested by an AHRI-approved third party
equipped with low-loss ball valves and flare fittings
able to handle more than one refrigerant
labeled as certified to meet EPA's requirements
When does the EPA allow you to NOT evacuated to the prescribed level?
When using a system-dependent recovery unit with a failed compressor.
When the repair is minor and less than half the charge will be vented.
When leaks in the appliance make evacuation to the prescribed level unattainable
When the approved recovery unit cannot achieve the EPA required evacuation level.
Replacement of ______________________ is always considered "major" under EPA's regulations?
a condenser
a compressor
an evaporator
all of the above
After reaching the required recovery vacuum, ___________.
immediately break the vacuum with nitrogen before the pressure rises
begin leak checking so the deep vacuum can help identify leaks
wait a few minutes to see if the system pressure rises before opening the system up for repairs
immediately open the system for service
To prevent freezing, when recharging an evacuated water-cooled chiller system with R-123, first charge with vapor to a pressure of at least _______________.
500 microns
600 microns
20 in Hg vacuum
. 2 psig
The lowest access point on a low-pressure centrifugal is the _____________.
the condenser service valve
the condenser liquid charging port
the compressor discharge port
evaporator charging valve
When charging a low-pressure chiller, first introduce the refrigerant as a vapor until__________.
the system pressure reaches 10 psig
the saturation temperature of the refrigerant being charged increases above 32 °F
the system pressure reaches 15 psig
There is multiple correct answers. Check all that apply.
When charging a low-pressure chiller with R-245ca, first introduce the refrigerant as a vapor until the pressure is greater than 18 inches Hg vacuum to prevent
the purge unit from venting excess refrigerant into the air
the purge unit from overheating
the chiller water from freezing
over-pressurization of the system and burst disk failure
When recharging a chiller, refrigerant is first added as a vapor followed by liquid refrigerant to avoid ________________.
acid buildup
oil subcooling and subsequent oil waxing
freezing of the water in the chiller barrels
over pressurization of the system
The EPA definition for the type of cooling that chillers usually provide is ___________.
industrial refrigeration
comfort cooling
process cooling
commercial cooling
The EPA definition for the type of cooling that chillers usually provide is ___________.
industrial refrigeration
comfort cooling
process cooling
commercial cooling
After a leaking system that has been repaired has passed the initial verification leak test, when must the follow-up verification test be conducted?
within 5 days
within 10 days
within 30 days
No follow-up verification test is required
What is a valid reason to request an extension from the EPA on the appliance leak repair deadline?
Local permit regulations make the repair within 30 days impossible.
More time is needed to obtain the necessary repair parts from the manufacturer.
The service technician you hired is busy with other work
There is multiple answers. Check all that apply
If an owner of a system (with 101 pounds of refrigerant charge that has a significant leak) is going to retire the system, and the replacement appliance uses refrigerant that is exempt from the venting prohibition, how much time does the owner have to retire the system?
3 years
2 years
18 months
12 months
If an appliance with a significant leak system is to be mothballed, the system must be _________.
shut down, and the leaking section or the entire system evacuated to at least 0 psig
disconnected electrically from any power source
moved into a storage facility such as a warehouse
all of the above
If the threshold leak rate has been exceeded, the owner must ____________.
notify the EPA within 10 days of the actual measured significant leak rate
repair the leak within 10 days
mothball the unit until the EPA provides instructions on whether to retire or replace the appliance
repair the appliance at least enough to bring the leak rate below the threshold, retrofit, or retire the appliance
The EPA's mandatory leak repair requirements apply to systems with a charge of ______ pounds or greater.
5 percent or more per year of the normal charge
15 percent or more per year of the normal charge
30 percent or more per year of the normal charge
50 percent or more per year of the normal charge
After January 1, 2019, a leaking industrial process refrigeration system with a charge of 70 pounds must be repaired if the leak rate exceeds________ of the charge per year.
5 percent or more per year of the normal charge
10 percent or more per year of the normal charge
20 percent or more per year of the normal charge
30 percent or more per year of the normal charge
The owners and operators of any system that has 50 or more pounds of refrigerant charge must keep records of refrigerant added, leak inspections, initial verification tests, and follow-up verification tests for at least _______.
2 years
3 years
5 years
8 years or the life of the appliance, whichever is less
An industrial process refrigerant system containing 600 pounds has a substantial leak that is leaking at a rate above the leak rate threshold. Unless granted additional time, what must be completed within 30 days?
Repair the appliance so that it leaks below the threshold and conduct the initial verification test.
Notify the EPA of the leak.
Fix the leak and perform both the initial and follow-on verification tests.
Schedule the repair and notify the EPA of the expected repair time.
For a comfort cooling system with a charge of 50 pounds or more of refrigerant, a substantial (or threshold) leak rate will be reduced to ________________after January 1, 2019.
5 percent or more per year of the normal charge
10 percent or more per year of the normal charge
20 percent or more per year of the normal charge
30 percent or more per year of the normal charge
When must the leak rate be calculated?
When topping off or recharging a system due to a loss of charge
When the system charge is more than 50 pounds
When you have topped off or changed the system at least twice in a calendar year
Multiple answers are correct
Pressure relief valves should NEVER be installed in ________.
series
parallel
recovery tanks
liquid receivers
Every refrigerating system must be protected by ______________________.
a pressure relief device
at lease on service valves
low-pressure shutoff valves
compressor isolation valves
Whenever you are using nitrogen to flush a system or break a vacuum, always use ________.
nitrogen gas not liquid nitrogen
a pressure regulator
a pressure relief valve downstream
all of the above
An equipment room refrigerant detector is NOT required under ASHRAE Standard 15 to detect _________, but the ventilation system must operate continuously.
R-1234yf
R-22
R-410A
R-717
A deep vacuum used for dehydration is usually measured in __________.
. psi
psig
inches of Hg
microns
If an R-410A system is in a room where the temperature is 80 °F, the pressure in the system is about _______.
183 psig
202 psig
238 psig
290 psig
The _______________________ is plumbed just downstream of the condenser.
accumulator
evaporator
receiver
compressor
Oil foaming usually occurs in the ___________________.
condenser
evaporator
compressor
expansion device
Always replace the ____________________ if the system is opened for servicing.
filter drier
Schrader valves
TXV device
accumulator
