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EPA 608 NEC 2023

EPA 608 Type 2 Exam Practice Test 2

Free EPA 608 Type II Exam Practice Test 2. 25 questions on oil sampling after burnout, excessive superheat as a leak indicator, oil foaming in compressors, non-condensables increasing discharge pressure, vacuum pump causing water freeze, recovery machine maintenance, filter-dryer placement, receiver refrigerant phase, ASHRAE 15 monitoring, nitrogen regulator function, subcooling and superheat measurements, service valve positions, Schrader valves, record keeping for large systems, 120-day repair extension, relief valve discharge piping, R-22 classification, R-502 composition, R-404A use, annual leak inspection, oil separator function, non-condensable accumulation, hot gas bypass, and scroll compressor advantages.

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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: Excessive superheat on the suction line is a primary indicator of low refrigerant charge (leak) in a high-pressure system. The filter-dryer must be in the liquid line between the receiver and the expansion device. The receiver holds liquid refrigerant at high pressure after the condenser. ASHRAE Standard 15 requires refrigerant monitors in machinery rooms for ALL refrigerant types regardless of toxicity classification.

25

Questions

45 min

Time

70%

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EPA 608 Type 2 Exam Practice Test 2 — Question List

Question 1: Which of the following case in refrigerant requires an oil sample should taken?

Compressor burn out
Evaporator coil failure
Filter dryer damage
Whenever the system is opened for maintenance

Question 2: Which of the following is an indicator of possible leak in high pressure refrigeration system?

High head pressure
Low water pressure
Excessive super heat
Frequent purging

Question 3: Usually in which of the following refrigerant component the oil foaming occurs ?

Condenser
Accumulator
Evaporator
Compressor

Question 4: Which of the following is effect of non-condensables in refrigeration system?

Lower suction pressure
Higher suction pressure
Lower discharge pressure
Higher discharge pressure

Question 5: 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 6: 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 compressor oil

Question 7: A filter-dryer must be installed in the ……………. Line to remove moisture and filter contaminants

Suction
Discharge
Liquid
Vapour

Question 8: The phase of the refrigerant in the receiver of refrigeration system is ………………………

Low temperature high pressure liquid
Low temperature high pressure vapour
High temperature low pressure liquid
High temperature low pressure vapour

Question 9: As per ASHRAE Standard 15, the following refrigerants require equipment room monitoring?

R-410
R -22
R-134 a
All refrigerants

Question 10: The purpose of regulator equipped with nitrogen tank?

To increase the outer pressure so that leak test is efficient
To lower the outlet pressure
To control the nitrogen flow from the rank
To the control the nitrogen temperature at outlet

Question 11: What is subcooling in a refrigeration system, and how is it measured?

The temperature drop across the evaporator from inlet to outlet
The number of degrees the liquid refrigerant is below its saturation temperature at condenser pressure
The temperature of the liquid refrigerant below the freezing point of water
The amount of heat removed from the refrigerant in the receiver

Question 12: How is suction line superheat measured on a refrigeration system?

The temperature difference between the suction and discharge lines
Actual suction line temperature minus the saturation temperature at the suction (low-side) pressure
The number of degrees the refrigerant vapor is below the condenser saturation temperature
The temperature at the evaporator inlet minus the temperature at the evaporator outlet

Question 13: A refrigeration service valve has three positions. What is the normal OPERATING position, and what is the SERVICE (isolation) position?

Front-seated = normal operating; back-seated = isolation
Back-seated = normal operating (valve open); front-seated = isolation (valve closed, service port open)
Mid-position = normal operating; back-seated = isolation
Both front-seated and back-seated allow refrigerant flow — only mid-position stops flow

Question 14: What type of valve is commonly found on modern residential and commercial air conditioning refrigerant circuits for gauge access, and what is its key feature?

Globe valve — manually closed to isolate the compressor for service
Schrader valve — a spring-loaded valve with a removable valve core for gauge access
Ball valve — used to completely stop refrigerant flow in the liquid line
Check valve — allows refrigerant to flow in only one direction

Question 15: Under EPA Section 608, what refrigerant system size triggers mandatory service record-keeping, and what information must be recorded?

All systems, regardless of charge size
Systems with 50 pounds or more of refrigerant
Only systems with more than 200 pounds of refrigerant
Record keeping is voluntary — not required by law

Question 16: An owner of a commercial refrigeration system discovers that the annual leak rate has exceeded the 35% threshold. A replacement compressor must be ordered and cannot arrive for 6 weeks. Can the owner wait for the compressor before completing the repair?

No — the system must be shut down immediately and cannot be operated until repaired
Yes — EPA allows up to 120 days from discovery when a major component must be ordered
No — the 30-day rule has no exceptions for any reason
Yes — but only if the system charge is less than 100 lbs

Question 17: When a pressure relief valve activates on a refrigeration system inside a machinery room, where must the discharged refrigerant be directed?

Into the compressor oil separator for safe disposal
To a safe outdoor location away from people and air intakes
Into the refrigerant receiver for reuse
Relief valve discharge goes directly into the machinery room — no piping needed

Question 18: R-22 is classified as which type of compound, and what is its ozone depletion potential (ODP)?

HFC — no chlorine, ODP = 0
HCFC — contains chlorine, ODP = 0.055
CFC — ODP = 1.0, same as R-12
Natural refrigerant — derived from hydrocarbons, ODP = 0

Question 19: What is R-502, and why is it no longer produced?

R-502 is a single-component HFC refrigerant with zero ODP, still in production
R-502 is an azeotropic blend of R-22 + R-115; no longer produced due to its CFC content depleting ozone
R-502 is a natural hydrocarbon refrigerant replaced by propane
R-502 is the same as R-410A — just an older name for the same blend

Question 20: What refrigerant commonly replaced R-502 in commercial and transport refrigeration applications, and what are its key properties?

R-22 — R-502 was replaced by R-22 in all commercial applications
R-404A — an HFC blend with zero ODP used in supermarket and transport refrigeration
R-410A — which replaced all older CFC and HCFC refrigerants
R-134a — used exclusively in all commercial refrigeration as the R-502 replacement

Question 21: After a large appliance (>50 lbs) has exceeded the leak rate threshold and been repaired, how often must the system be inspected for leaks?

Monthly inspections are required after any leak
Annually — the system must be inspected for leaks each year following a threshold-triggered repair
Every 5 years — same as recovery cylinder testing
No follow-up inspection is required after a repair is completed

Question 22: What is the function of an oil separator in a refrigeration system, and where is it located?

Removes refrigerant from the compressor oil before the oil is drained
Removes compressor oil from the discharge gas and returns it to the compressor crankcase
Filters water and moisture from the oil in the crankcase
Controls the oil level in the receiver to prevent oil from entering the condenser

Question 23: In a refrigeration system, where do non-condensable gases (such as air or nitrogen) accumulate, and how does their presence affect system performance?

At the bottom of the receiver — they sink in liquid refrigerant
At the top of the condenser — causing higher than normal head pressure
In the suction line — causing lower than normal suction pressure
Non-condensables dissolve in refrigerant and have no effect on system pressure

Question 24: What is the purpose of a hot gas bypass (HGBP) in a refrigeration or A/C system?

To recover hot refrigerant gas from the discharge line into the recovery cylinder
To prevent evaporator freeze-up at part-load by bypassing hot discharge gas into the evaporator inlet
To defrost the evaporator coil by passing hot gas through it on a timer
To superheat the suction gas before it enters the compressor

Question 25: What is a scroll compressor, and what makes it different from a reciprocating compressor?

A scroll compressor uses pistons in a rotating barrel arrangement for high efficiency
A scroll compressor uses two interlocking spirals — no valves, fewer parts, quieter and more efficient
A scroll compressor uses a rotating screw to compress refrigerant, requiring high-viscosity oil
A scroll compressor is only used in low-pressure (Type III) refrigeration systems

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

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Source: EPA Section 608 (40 CFR Part 82)