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EPA 608 NEC 2023

EPA 608 Type 2 Exam Practice Test 1

Free EPA 608 Type II Exam Practice Test 1. 25 questions covering liquid charging for large systems, pressure relief valve installation rules, pre-charging vapor pressure for R-12 water-cooled systems, accumulator location in the refrigeration cycle, nitrogen for leak checking, compressor isolation before removal, post-recovery pressure verification, reciprocating compressor safety, pressure relief requirements, R-410A idle system pressure, oil sampling after burnout, recovered refrigerant contamination, deep vacuum measurement in microns, liquid vs vapor recovery speed, EPA recovery levels for large and small systems, comfort cooling and commercial leak thresholds, R-22 saturation pressure, R-410A composition and liquid charging requirement, POE oil for R-410A, semi-hermetic compressor, triple evacuation, and 30-day leak repair obligation.

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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 Type II (high-pressure) systems: Systems with ≥200 lbs of refrigerant require recovery to 15 in. Hg vacuum using certified equipment (post-Nov 15, 1993). Systems <200 lbs require recovery to 0 psig. Leak repair is required when annual leak rate exceeds 15% for comfort cooling or 35% for commercial refrigeration (systems >50 lbs). R-410A must always be charged as liquid — never as vapor — to maintain the correct blend composition.

25

Questions

45 min

Time

70%

Pass

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EPA 608 Type 2 Exam Practice Test 1 — Question List

Question 1: If the system has a normal charge of 80 pounds, which of the following is the method to charge this system?

Charge with vapor through suction line service valve
Charge with vapor through discharge service valve
Charge with liquid through liquid line service valve
Charge with vapor through vapor line service valve

Question 2: In which of the following combination the pressure relief valves should not installed?

Series
Parallel
Vertically
Horizontally

Question 3: The R-12 refrigeration system which uses water cooled condenser should be charged first with vapor pressure of at least ………… before switching to liquid charging.

0 psig
25 psig
35 psig
100 psig

Question 4: Which of the following component directly following the evaporator in the refrigeration system?

Receiver
Metering device
Accumulator
Condenser

Question 5: The leak check should be done on heat pump that uses R-410A with ………..

Pressurised oxygen
Pressurised HCFC
Pressurised hydrogen
Pressurised nitrogen

Question 6: The compressor should be isolated before changing the compressor on a system containing R-410A then evacuate the compressor section to ……………… ……………… and hold. If the system pressure does not rise, remove the compressor.

Atmospheric pressure
10 inches of vacuum
15 inches of vacuum
25 inches of vacuum

Question 7: What should be done when you reach required recovery vacuum on a system?

Immediately disconnect the recycling equipment and open the system for service
Immediately pressurise the system with nitrogen and open the system for service
See if the system pressure rises, indicating the small amount of refrigerant is trapped in system
Immediately pressurise with hydrogen and open the system for service

Question 8: Which of the following condition the reciprocating compressor should not be energized?

When the discharge service valve is close
When the discharge service valve is open
When the suction service valve is open
When the suction pressure is high.

Question 9: Every refrigeration system should be protected by ……………………..

Low pressure control device
Pressure relief device
Refrigerant recovery receiver
stop valve

Question 10: What is the non-operating pressure inside an R-410A refrigerant system at room temperature 72°F?

78 psig
110 psig
210 psig
410 psig

Question 11: Which of the following condition the oil sample should be taken from refrigeration system?

When a new filter dryer is installed
When the compressor has burned out
When the unit is not cooling properly
When there is a leak of refrigerant

Question 12: Which of the following does the recovered refrigerant from refrigeration system contains?

Acids only
Moisture only
Both acids and moisture
Nitrogen only

Question 13: which of the following is a measuring unit of deep vacuum in a system?

psig
psia
microns
inches of hg

Question 14: The recovery process of liquid refrigerant is .................... than vapor refrigerant?

same
faster
slower
none

Question 15: Using EPA-certified recovery equipment (manufactured after November 15, 1993) on a high-pressure system containing 250 pounds of refrigerant, what is the minimum recovery level required?

0 psig (atmospheric pressure)
15 inches of mercury (in. Hg) vacuum
25 inches of mercury (in. Hg) vacuum
4 inches of mercury (in. Hg) vacuum

Question 16: Using certified recovery equipment on a high-pressure system with a refrigerant charge of 80 pounds, what is the minimum required recovery level?

15 inches of mercury vacuum
0 psig (atmospheric pressure)
25 inches of mercury vacuum
4 inches of mercury vacuum

Question 17: Under EPA Section 608, at what annual leak rate must a comfort cooling (HVAC) appliance with more than 50 pounds of refrigerant be repaired?

5% per year
15% per year
35% per year
50% per year

Question 18: Under EPA Section 608, what is the annual leak rate threshold that triggers a mandatory leak repair requirement for commercial refrigeration equipment with more than 50 pounds of refrigerant?

15% per year
35% per year
50% per year
10% per year

Question 19: Approximately what is the saturation (equilibrium) pressure of R-22 at 70°F?

About 74 psig
About 121 psig
About 210 psig
About 33 psig

Question 20: R-410A is a blended refrigerant. What two refrigerants make up R-410A, and in what proportions?

R-22 (50%) + R-115 (50%)
R-32 (50%) + R-125 (50%)
R-12 (73.8%) + R-152a (26.2%)
R-125 (50%) + R-134a (50%)

Question 21: When charging an R-410A system, why must the refrigerant be added as a LIQUID rather than as a vapor?

Because liquid refrigerant is cheaper than vapor
To maintain the correct 50/50 blend composition — vapor charging causes the ratio to shift
Vapor charging can damage the compressor immediately
There is no difference — R-410A can be charged as liquid or vapor with no effect

Question 22: What type of lubricating oil is required in R-410A air conditioning systems, and what happens if the wrong oil is used?

Mineral oil — same as R-22 systems
POE (Polyolester) oil — mineral oil does not mix with R-410A and starves the compressor
Alkylbenzene (AB) oil — compatible with all refrigerants
No oil is needed — R-410A is self-lubricating

Question 23: What distinguishes a semi-hermetic (accessible hermetic) compressor from a fully hermetic compressor?

A semi-hermetic compressor is smaller and lighter
A semi-hermetic has a bolted housing that can be opened for field service; a fully hermetic is welded shut
A semi-hermetic uses a shaft seal; a fully hermetic does not
There is no difference — semi-hermetic and fully hermetic are the same thing

Question 24: What is the purpose of the "triple evacuation" (also called multiple evacuation) method when dehydrating a refrigerant system?

To charge the system three times to make sure the correct charge is loaded
To remove moisture more effectively by breaking the vacuum with nitrogen between each evacuation pull
To test the system at three different pressures before charging
To recover refrigerant in three stages from both high and low sides

Question 25: Under EPA Section 608, when a comfort cooling system with more than 50 pounds of refrigerant is found to have a leak rate exceeding the 15% annual threshold, how soon must the leak be repaired?

Immediately — the system must be shut down and cannot be recharged
Within 30 days of discovering the leak
Within 1 year — the leak can continue until the next annual inspection
Within 7 days

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)