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EPA 608 NEC 2023

EPA 608 Type 1 Exam Practice Test 3

Free EPA 608 Type I Exam Practice Test 3. 25 questions covering passive recovery with non-operating compressor, piercing valve tube materials, nitrogen venting, R-410A cylinder pressure, refrigerant mixing prohibition, nitrogen tank regulator, certification permanence, vacuum pump prohibition for recovery, smoking and open flames near refrigerants, R-134a ozone impact, high-side recovery with operating compressor, both-side access without compressor, self-contained recovery compressor, R-600a flammability precautions, recovery efficiency standards, refrigerant density and oxygen displacement, process tube location, process tube sealing, dedicated recovery cylinders, appliance heating to speed recovery, Type I equipment scope, end-of-life disposal, recovery equipment EPA approval, process tube service access, and refrigerant identification.

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The EPA 608 certification is required by law for any technician who purchases or handles refrigerants. It covers safe handling, leak detection, recovery, and environmental regulations.

Type I covers small appliances (≤5 lbs refrigerant), Type II covers high-pressure systems, Type III covers low-pressure systems, and Universal covers all three. Most HVAC technicians pursue Universal certification.

You must score at least 70% on each section of the exam. The Universal exam has four parts: core, Type I, Type II, and Type III.

Key facts for this test: In passive (system-dependent) recovery when the compressor does NOT run, you must connect to BOTH the high side and the low side of the system. Piercing-type access valves can be used on copper OR aluminium process tubes. Nitrogen is NOT a refrigerant and can be vented after use — it is not regulated under Section 608. A vacuum pump cannot be used as a recovery device — it is only for evacuation. EPA 608 certification never expires.

25

Questions

45 min

Time

70%

Pass

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EPA 608 Type 1 Exam Practice Test 3 — Question List

Question 1: The technician should access both high and low side of the refrigerant recovery system in passive system dependent refrigerant recovery process because ............

There may be leak in the system
The system compressor operates manually
The system compressor runs at half speed only
The system compressor does not run

Question 2: Which of the following tube materials on which piercing-type valves should be used?

Copper only
Aluminium only
Both copper and aluminium
Silver

Question 3: If pressurized nitrogen is used to blow debris or of refrigeration system. After the prices the nitrogen ,.........

Must be recovered
Can be vented
Can be mixed with R-22
Should be left in the system to check leaks in the system online.

Question 4: A half full of R-410A recovered cylinder at 90 degrees F, in the absence of non condensables, will be pressurized to ............

100 psig
200 psig
300 psig
400 psig

Question 5: Which of the following refrigerants can be mixed?

R-22 and R-134a
R-12 and R-500
R-22 and R-410A
refrigerants can never be mixed

Question 6: The nitrogen tank should always be equipped with a .............

regulator
level sensor
yellow top
hand valve

Question 7: The technician should renew the EPA section 608 certification every..................

3 years
5 years
10 years
it has no expiration date

Question 8: The vacuum pump designed for evacuation and dehydration can ..........

be used alone self contained recovery device
never be used as a recovery device
be used as a substitute for recovery device
be used as a system dependent recovery device

Question 9: Should a technician smoke or use open flames while handling or recovering refrigerants?

Yes — smoking is allowed outdoors during refrigerant recovery
No — smoking and open flames are prohibited during refrigerant service work
Only smoking is allowed — open flames are prohibited
Open flames are acceptable if the refrigerant is R-134a

Question 10: R-134a replaced R-12 in new small appliances because R-134a has a much lower ozone depletion potential (ODP). What is R-134a's ODP?

ODP = 1.0 (same as R-12)
ODP = 0 (zero)
ODP = 0.055 (same as R-22)
ODP = 0.5 (half of R-12)

Question 11: When using system-dependent recovery on a small appliance with a working compressor, the technician only needs to connect to the __________ of the system.

Low side only
High side only
Both high side and low side
Process tube only

Question 12: When recovering refrigerant from a small appliance with a NON-OPERATING compressor, a technician should connect recovery equipment to ___________.

Only the high side — the low side has no refrigerant when compressor is off
Both the high side and the low side
The liquid line only
Neither side — recovery is not possible without a working compressor

Question 13: What component in a self-contained (active) recovery machine allows it to recover refrigerant even when the system's compressor is not working?

A special non-pressurized recovery vessel that automatically draws refrigerant
The recovery machine's own built-in compressor
A large fan that pushes refrigerant vapor into the recovery tank
An external vacuum pump connected to the machine

Question 14: A household refrigerator is found to use R-600a (isobutane) as its refrigerant. What is the primary safety concern when servicing this appliance?

R-600a is highly toxic — wear a respirator at all times
R-600a is highly flammable — eliminate all ignition sources before service
R-600a is under very high pressure — use special high-pressure recovery equipment
No special precautions needed for R-600a

Question 15: Recovery equipment for small appliances (certified after November 1993) must be able to remove at least ___% of refrigerant when the system compressor is OPERATING.

80%
90%
95%
70%

Question 16: Recovery equipment for small appliances must remove at least ___% of refrigerant when the system compressor is NOT operating.

90%
80%
70%
60%

Question 17: If refrigerant leaks in a closed room or basement, where does the refrigerant vapor collect, and why?

Refrigerant rises and collects near the ceiling because it is lighter than air
At the floor and in low areas, because refrigerant vapor is heavier than air
Refrigerant spreads evenly throughout the room at all heights
Refrigerant immediately escapes through any opening — it does not collect indoors

Question 18: Where is the process tube (service access tube) typically located on a small household appliance such as a refrigerator?

On the condenser coil, at the highest point of the system
On the suction line (low side), near the compressor
On the expansion valve, at the inlet
Inside the compressor housing

Question 19: After completing service on a small appliance and removing the piercing access valve, how should the technician seal the process tube?

Leave the piercing valve in place for easy future access
Braze (silver-solder) the process tube closed to permanently seal it
Cap the tube with a rubber plug
Wrap the process tube end with PTFE tape

Question 20: Can a technician use the same recovery cylinder for two different refrigerants — for example, putting R-134a into a cylinder that already contains some recovered R-12?

Yes — any refrigerant can go into any recovery cylinder
No — each refrigerant must have its own dedicated recovery cylinder
Yes — as long as the cylinder is less than half full
Only if both refrigerants are HFCs

Question 21: Why does gently warming a small appliance (such as a refrigerator) help to improve refrigerant recovery speed and completeness?

Warming the appliance makes the refrigerant contract and easier to pump
Warming increases refrigerant vapor pressure, pushing more refrigerant into the recovery vessel
Warming has no effect on recovery — it only helps with evacuation
Warming the appliance reduces the need for recovery entirely

Question 22: EPA Type I certification authorizes a technician to service appliances with a refrigerant charge of ___________.

Any amount of refrigerant
5 pounds or less
50 pounds or less
15 pounds or less

Question 23: A household refrigerator has broken down and the owner decides to throw it away. What must happen to the refrigerant before the appliance is taken to a landfill or recycling center?

Nothing — the refrigerant will leak out safely as the appliance ages in the landfill
The refrigerant must be recovered by a certified technician before disposal
The owner can vent the refrigerant themselves before placing the appliance at the curb
Small appliances are exempt from the recovery requirement at end of life

Question 24: Recovery equipment manufactured after November 15, 1993 must be ____________ before it can be used to service refrigeration equipment under EPA Section 608.

Registered with the state HVAC licensing board
Tested and certified by an EPA-approved laboratory (certified to ARI 740)
Inspected by the EPA directly before each use
No certification is needed — any recovery equipment is acceptable

Question 25: What is a "process tube" on a hermetically sealed small appliance, and what is its purpose?

A tube that connects the outdoor condenser to the indoor evaporator
A straight copper tube on the refrigerant circuit used as a service access point for adding or removing refrigerant
The capillary tube that controls refrigerant flow into the evaporator
The discharge line from the compressor to the condenser

Study Tip: The EPA 608 exam is closed book. Memorize: recovery is required before opening any refrigerant system. Venting refrigerant is illegal. Know the ODP and GWP values for R-22, R-410A, R-134a, R-32, and R-454B.

EXAM CARD EPA 608

Questions25

Time limit45 min

Pass score70%

RegulationEPA Section 608

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: EPA Section 608 (40 CFR Part 82)