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EPA 608 NEC 2023

EPA 608 Type 2 Exam Practice Test 3

Free EPA 608 Type II Exam Practice Test 3. 25 questions on receiver location, filter-dryer placement, recovery machine maintenance, vacuum pump and trapped water, ice removal from sight glasses, oil sampling after leak detection, filter-dryer replacement after opening, vacuum pump micron rating, residential A/C refrigerant type, deep vacuum measurement, R-410A tooling requirements, charging by weight, leak rate calculation, high-pressure cutout, crankcase heater, recovery before opening a system, system pressure for refrigerant identification, R-407C as an R-22 replacement, suction accumulator function, moisture indicator sight glass, Type II vs Type III distinction, R-22 phase-out, pressure test limits, correct recovery cylinder selection, and R-410A operating pressure.

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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: The receiver is always at the outlet of the condenser. Always replace the filter-dryer after any system opening. Deep vacuum is measured in microns; systems are normally evacuated with a vacuum pump to 500 microns or better (a vacuum pump is not a recovery device). R-22 is still the refrigerant found in the majority of existing residential split A/C systems — Type II technicians must know it well. When removing ice from a sight glass, use an alcohol spray — never a flame.

25

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45 min

Time

70%

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EPA 608 Type 2 Exam Practice Test 3 — Question List

Question 1: Which of the following location, the receiver is installed in the refrigeration system?

Outlet of condenser
Outlet of evaporator
After accumulator
After metering device

Question 2: A filter-dryer must be installed in the ……………. Line to remove moisture and filter contaminants

Suction
Discharge
Liquid
Vapour

Question 3: Which of the following is the frequently carried maintenance of refrigerant recovery system?

Checking the compressor valves
Adding refrigerant to encounter the leakages
Changing the filter and compressor oil
Cleaning the evaporator coil

Question 4: If large vacuum pump is used for evacuating a refrigeration system………….

It causes the trapped oil to freeze
It causes the trapped refrigerant to freeze
It causes the trapped water to freeze
It causes the components to freeze

Question 5: The ice on sight glasses should be cleaned with …………………

An alcohol spray
A micron screw driver
A small heater
A HCFC spray

Question 6: If a leak is observed in the refrigeration system ………………

Oil sample should be taken for analysis
Refrigerant should be recovered first
The compressor should be changed
The filter dryer should be changed

Question 7: Which of the following component is replaced always after a system is opened for service?

Compressor heater
Filter dryer
Oil purifier
Evaporator coil

Question 8: When vacuum pump is used for refrigerant recovery process, it should be capable of pulling a vacuum of …………… microns

200
500
800
600

Question 9: Which of the following type of refrigerant is used residential split Air conditioner?

R-22
R-12
R-123
R-134a

Question 10: Which of the following measurement is suitable for measuring deep vacuum in a system?

Microns
Inches of hg
Psig
psia

Question 11: Why does servicing R-410A systems require different tools than R-22 systems?

No special tools are needed — R-22 and R-410A tools are interchangeable
R-410A operates at much higher pressures, so gauges and hoses must be rated for those pressures
R-410A requires special laser-guided tools because it is a blend refrigerant
Only the refrigerant cylinder is different — all other tools are the same

Question 12: What is the most accurate method to determine when a refrigeration system has been properly charged after repair?

Add refrigerant until the sight glass shows no bubbles and stop
Charge by weight — add exactly the amount specified on the equipment nameplate using a refrigerant scale
Add refrigerant until the suction pressure matches R-22 normal operating pressure
Charge until the discharge temperature reaches 130°F, then stop

Question 13: A comfort cooling system has a full refrigerant charge of 120 pounds. Over the past 12 months, 22 pounds of refrigerant were added due to leaks. What is the annual leak rate, and must it be repaired?

Leak rate = 18.3%; below threshold — no repair needed
Leak rate = 18.3%; exceeds the 10% comfort cooling threshold — repair required within 30 days
Leak rate = 22%; above threshold — must shut down immediately
Leak rate = 10%; exactly at threshold — no action required

Question 14: What is the purpose of a high-pressure cutout (HPCO) safety control in a refrigeration system?

To maintain the discharge pressure at the correct operating level automatically
To shut off the compressor when discharge pressure rises above a safe limit
To limit the pressure in the liquid line between the condenser and expansion device
To release excess pressure through a vent when the system is overcharged

Question 15: What is the purpose of a crankcase heater on a refrigeration compressor, and what happens if it fails?

To heat the compressor during the cooling season to improve efficiency
To keep compressor oil warm during off-cycle to prevent refrigerant from dissolving into the oil
To warm the suction gas before it enters the compressor to increase superheat
To prevent the compressor from starting in cold weather by locking it off below 32°F

Question 16: A technician needs to replace a TXV (thermostatic expansion valve) on a commercial R-22 system. What must be done FIRST before opening the refrigerant circuit?

Only wear gloves — refrigerant can be vented into a well-ventilated area before opening
Recover all refrigerant from the system before opening any refrigerant-containing connection
Simply front-seat the service valves to isolate the section — no recovery needed
Call the equipment manufacturer for permission before recovering refrigerant

Question 17: A technician arrives at a commercial refrigeration system with no visible service label. How can the technician determine what refrigerant is in the system before beginning service?

There is no way to identify refrigerant without a service label — call the manufacturer
Measure system pressure and compare to P-T charts, or use a refrigerant identifier
Smell the refrigerant — each type has a unique recognizable odor
Read the electrical panel label — the electrical requirements indicate the refrigerant type

Question 18: R-407C is sometimes used as a replacement for R-22 in existing systems. What important characteristic of R-407C must technicians know when using it?

R-407C is a true azeotropic drop-in for R-22 — no changes needed
R-407C is a zeotropic blend with about 10°F of temperature glide — must be charged as liquid, and oil may need changing
R-407C is a single-component HFC, exactly like R-22 but without chlorine
R-407C cannot be used in R-22 systems under any circumstances

Question 19: What component is installed in the suction line between the evaporator and the compressor, and what does it protect against?

A liquid receiver — stores extra refrigerant when load decreases
A suction line accumulator — prevents liquid refrigerant from entering and damaging the compressor
An oil separator — removes oil from the suction gas before it enters the compressor
A filter-dryer in the suction line — removes moisture from vapor before compression

Question 20: A sight glass with a moisture indicator shows a yellow/yellow-green color instead of the normal green. What does this indicate?

Yellow means the system is overcharged with refrigerant
Yellow indicates moisture is present in the refrigerant — the filter-dryer should be replaced
Yellow means the refrigerant is at the correct temperature and charge level
The color of the sight glass indicator has no practical meaning for the technician

Question 21: What is the key difference between Type II and Type III certification under EPA Section 608?

Type II covers CFC refrigerants; Type III covers HCFC refrigerants
Type II = high-pressure systems (R-22, R-410A); Type III = low-pressure systems that operate below atmospheric pressure (R-11, R-123)
Type II covers large systems (>200 lbs); Type III covers medium systems (50-200 lbs)
Type II and Type III cover the same equipment — only the geographic region differs

Question 22: What happened to R-22 refrigerant production and import in the United States on January 1, 2020?

R-22 production was voluntarily reduced but not completely banned — it can still be manufactured
R-22 production and import was completely banned — only recovered and reclaimed R-22 is available
January 1, 2020 was when R-22 was banned in NEW equipment — existing R-22 can still be produced
Nothing changed in 2020 — R-22 is still freely produced and widely available

Question 23: When pressure-testing a refrigerant system with nitrogen, what is the maximum test pressure that should be used?

Always test at 500 psig regardless of the refrigerant or system type
Do not exceed the design pressure (maximum allowable working pressure) of the lowest-rated component
Test at 1.5 times the normal operating pressure — this is the standard safety factor
Nitrogen pressure testing has no pressure limit — stop when you find the leak

Question 24: A technician has two recovery cylinders: one labeled "R-22" with some recovered R-22 inside, and an empty unlabeled cylinder. The technician is recovering R-410A. Which cylinder should be used?

Use the R-22 labeled cylinder — it can hold any refrigerant
Neither — use a cylinder specifically labeled and dedicated for R-410A
Use the empty unlabeled cylinder — it can be labeled after filling
Both cylinders are fine — just do not fill either more than 80%

Question 25: During a hot summer day (95°F ambient), a technician measures the high-side (discharge) pressure on an R-410A system. Approximately what is the expected condensing pressure?

About 180-200 psig — same as R-22 at the same ambient temperature
About 375-420 psig — R-410A operates at much higher pressure than R-22
About 600-700 psig — R-410A always operates near the safety relief pressure
About 85 psig — high-side pressure drops in hot weather because the system works harder

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)