EPA 608 TYPE III COMPREHENSIVE QUESTIONS |
Complete 200-Question Bank with Correct
Answers and Detailed Rationales 2026/2027
EXAM OVERVIEW
Component Details
Certification Type Type III - Low-Pressure Appliances
Primary
Centrifugal chillers using refrigerants like CFC-11, HCFC-123
Equipment
Recovery procedures, leak detection, purge units, safety regulations, evacuatio
Key Topics
levels
SECTION 1: TYPE III FUNDAMENTALS & EQUIPMENT IDENTIFICATION
Question 1
What type of equipment does a Type III certified technician primarily work on?
A) Small appliances with less than 5 pounds of refrigerant
B) High-pressure systems using HCFC-22
C) Low-pressure appliances such as chillers using CFC-11 or HCFC-123
D) Motor vehicle air conditioning systems
Correct Answer: C
Rationale: A Type III technician primarily works on equipment using a low-pressure
refrigerant such as HCFC-123 or CFC-11. These units are primarily chillers. Type I covers
small appliances, and Type II covers high-pressure systems.
,Question 2
Which refrigerants are classified as low-pressure refrigerants for Type III certification?
A) R-12, R-22, R-502
B) R-11, R-113, R-123
C) R-134a, R-410A, R-404A
D) R-744, R-717
Correct Answer: B
Rationale: Low-pressure refrigerants for Type III certification include R-11, R-113, and R-
123. These refrigerants have a boiling point above 10°C at atmospheric pressure. R-12,
R-22, and R-502 are high-pressure refrigerants for Type II.
Question 3
What is the boiling point characteristic of a low-pressure refrigerant?
A) Below -50°C at atmospheric pressure
B) Between -50°C and 10°C at atmospheric pressure
C) Above 10°C at atmospheric pressure
D) Below -100°C at atmospheric pressure
Correct Answer: C
Rationale: Low-pressure refrigerants have a boiling point above 10°C at atmospheric
pressure. High-pressure refrigerants have a boiling point between -50°C and 10°C at
atmospheric pressure.
Question 4
Why do chillers using refrigerants such as CFC-11 and HCFC-123 require a purge unit?
A) To remove oil from the system
B) To remove non-condensables from the system
C) To add refrigerant to the system
D) To increase system pressure
,Correct Answer: B
Rationale: Because chillers using refrigerants such as CFC-11 and HCFC-123 operate
below atmospheric pressure, they require a purge unit. The primary purpose of a purge
unit is to remove non-condensables (air and other gases) from the system.
Question 5
What is the primary purpose of a purge unit on a low-pressure chiller?
A) To remove refrigerant from the system
B) To remove non-condensables from the system
C) To add refrigerant to the system
D) To increase system pressure
Correct Answer: B
Rationale: The primary purpose of a purge unit is to remove non-condensables from
the system. Non-condensables reduce system efficiency and can cause corrosion. A
purge unit removes air and other gases while returning refrigerant to the system.
Question 6
Because a low-pressure system operates below atmospheric pressure (in a vacuum),
leaks in gaskets or fittings will cause:
A) Refrigerant to escape to the atmosphere
B) Air and moisture to enter the system
C) The system pressure to increase
D) The system to become over-pressurized
Correct Answer: B
Rationale: Because a low-pressure system operates below atmospheric pressure (in a
vacuum), leaks in the gaskets or fittings will cause air and moisture to enter the system.
This is opposite to high-pressure systems where refrigerant escapes.
, Question 7
All refrigeration systems must be protected by which device?
A) Purge unit
B) Pressure relief valve
C) Filter drier
D) Sight glass
Correct Answer: B
Rationale: All refrigeration systems must be protected by a pressure relief valve(s),
which must not be installed in series. This safety device prevents catastrophic over-
pressurization of the system.
Question 8
To protect the system from over-pressurization, low-pressure chillers typically use a
rupture disc mounted on the:
A) Compressor housing
B) Condenser shell
C) Evaporator housing
D) Liquid line
Correct Answer: C
Rationale: To protect the system from over-pressurization, low-pressure chillers
typically use a rupture disc mounted on the evaporator housing. The typical design
burst pressure for a rupture disc is 15 psig.
Question 9
What is the typical design burst pressure for a rupture disc on a low-pressure chiller?
A) 5 psig
B) 10 psig
C) 15 psig
D) 25 psig
Complete 200-Question Bank with Correct
Answers and Detailed Rationales 2026/2027
EXAM OVERVIEW
Component Details
Certification Type Type III - Low-Pressure Appliances
Primary
Centrifugal chillers using refrigerants like CFC-11, HCFC-123
Equipment
Recovery procedures, leak detection, purge units, safety regulations, evacuatio
Key Topics
levels
SECTION 1: TYPE III FUNDAMENTALS & EQUIPMENT IDENTIFICATION
Question 1
What type of equipment does a Type III certified technician primarily work on?
A) Small appliances with less than 5 pounds of refrigerant
B) High-pressure systems using HCFC-22
C) Low-pressure appliances such as chillers using CFC-11 or HCFC-123
D) Motor vehicle air conditioning systems
Correct Answer: C
Rationale: A Type III technician primarily works on equipment using a low-pressure
refrigerant such as HCFC-123 or CFC-11. These units are primarily chillers. Type I covers
small appliances, and Type II covers high-pressure systems.
,Question 2
Which refrigerants are classified as low-pressure refrigerants for Type III certification?
A) R-12, R-22, R-502
B) R-11, R-113, R-123
C) R-134a, R-410A, R-404A
D) R-744, R-717
Correct Answer: B
Rationale: Low-pressure refrigerants for Type III certification include R-11, R-113, and R-
123. These refrigerants have a boiling point above 10°C at atmospheric pressure. R-12,
R-22, and R-502 are high-pressure refrigerants for Type II.
Question 3
What is the boiling point characteristic of a low-pressure refrigerant?
A) Below -50°C at atmospheric pressure
B) Between -50°C and 10°C at atmospheric pressure
C) Above 10°C at atmospheric pressure
D) Below -100°C at atmospheric pressure
Correct Answer: C
Rationale: Low-pressure refrigerants have a boiling point above 10°C at atmospheric
pressure. High-pressure refrigerants have a boiling point between -50°C and 10°C at
atmospheric pressure.
Question 4
Why do chillers using refrigerants such as CFC-11 and HCFC-123 require a purge unit?
A) To remove oil from the system
B) To remove non-condensables from the system
C) To add refrigerant to the system
D) To increase system pressure
,Correct Answer: B
Rationale: Because chillers using refrigerants such as CFC-11 and HCFC-123 operate
below atmospheric pressure, they require a purge unit. The primary purpose of a purge
unit is to remove non-condensables (air and other gases) from the system.
Question 5
What is the primary purpose of a purge unit on a low-pressure chiller?
A) To remove refrigerant from the system
B) To remove non-condensables from the system
C) To add refrigerant to the system
D) To increase system pressure
Correct Answer: B
Rationale: The primary purpose of a purge unit is to remove non-condensables from
the system. Non-condensables reduce system efficiency and can cause corrosion. A
purge unit removes air and other gases while returning refrigerant to the system.
Question 6
Because a low-pressure system operates below atmospheric pressure (in a vacuum),
leaks in gaskets or fittings will cause:
A) Refrigerant to escape to the atmosphere
B) Air and moisture to enter the system
C) The system pressure to increase
D) The system to become over-pressurized
Correct Answer: B
Rationale: Because a low-pressure system operates below atmospheric pressure (in a
vacuum), leaks in the gaskets or fittings will cause air and moisture to enter the system.
This is opposite to high-pressure systems where refrigerant escapes.
, Question 7
All refrigeration systems must be protected by which device?
A) Purge unit
B) Pressure relief valve
C) Filter drier
D) Sight glass
Correct Answer: B
Rationale: All refrigeration systems must be protected by a pressure relief valve(s),
which must not be installed in series. This safety device prevents catastrophic over-
pressurization of the system.
Question 8
To protect the system from over-pressurization, low-pressure chillers typically use a
rupture disc mounted on the:
A) Compressor housing
B) Condenser shell
C) Evaporator housing
D) Liquid line
Correct Answer: C
Rationale: To protect the system from over-pressurization, low-pressure chillers
typically use a rupture disc mounted on the evaporator housing. The typical design
burst pressure for a rupture disc is 15 psig.
Question 9
What is the typical design burst pressure for a rupture disc on a low-pressure chiller?
A) 5 psig
B) 10 psig
C) 15 psig
D) 25 psig
