EPA Section 608 Type III Certification
Exam Practice Questions And Correct
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1. What type of appliance is considered low-pressure under EPA Section
608?
A. Small window air conditioner
B. Residential refrigerator
C. Centrifugal chiller
D. Split-system heat pump
Low-pressure appliances operate below 30 psig; centrifugal chillers
use R-11, R-123, etc., which are low-pressure refrigerants.
2. What is the typical pressure of R-123 at 80°F?
A. 118 psig
, B. 124 psig
C. 15 psig
D. 195 psig
R-123 has a low vapor pressure of about 124 psig at 80°F, consistent
with low-pressure systems.
3. When evacuating a low-pressure system, the required vacuum level is
measured in:
A. Inches of water column
B. Inches of mercury above zero
C. Inches of mercury vacuum
D. Microns absolute pressure
EPA mandates evacuation requirements in inches of mercury vacuum
for Type III.
4. What is the maximum allowable leak rate for low-pressure appliances?
A. 10% per year
B. 15% per year
C. 10% per year
D. 30% per year
The EPA leak rate threshold for low-pressure systems is 10% per year.
5. Which refrigerant is commonly used in low-pressure chillers?
A. R-410A
B. R-22
C. R-123
, D. R-404A
R-123 is widely used in centrifugal chillers as a low-pressure
refrigerant.
6. What is the purpose of a purge unit on a low-pressure system?
A. Add oil
B. Control temperature
C. Remove non-condensables
D. Add refrigerant
Purge units remove air and other non-condensable gases from the
chiller to maintain efficiency.
7. What can cause high system pressure in a low-pressure chiller?
A. Low water temperature
B. Excessive air in system
C. Low refrigerant charge
D. Faulty TXV
Air and other non-condensables raise condenser pressure in low-
pressure systems.
8. What is a key indication of non-condensables in a low-pressure chiller?
A. High suction pressure
B. High condenser pressure
C. Low evaporator pressure
D. Low oil pressure
Non-condensables collect in the condenser, increasing pressure.
, 9. Before recovering refrigerant from a low-pressure chiller, the water
box should be:
A. Left open
B. Isolated and drained
C. Heated
D. Pressurized
Isolating and draining prevents water contamination or pressure
damage during recovery.
10. What refrigerant state is typically recovered from low-pressure
systems?
A. Liquid only
B. Vapor only
C. Both liquid and vapor
D. None
Recovery occurs from both liquid and vapor phases to remove all
refrigerant.
11. When is refrigerant recovered as vapor from a low-pressure
system?
A. When liquid is exhausted
B. When system pressure is below atmospheric
C. When the chiller is running
D. When oil is added
Below atmospheric pressure, only vapor recovery is possible.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What type of appliance is considered low-pressure under EPA Section
608?
A. Small window air conditioner
B. Residential refrigerator
C. Centrifugal chiller
D. Split-system heat pump
Low-pressure appliances operate below 30 psig; centrifugal chillers
use R-11, R-123, etc., which are low-pressure refrigerants.
2. What is the typical pressure of R-123 at 80°F?
A. 118 psig
, B. 124 psig
C. 15 psig
D. 195 psig
R-123 has a low vapor pressure of about 124 psig at 80°F, consistent
with low-pressure systems.
3. When evacuating a low-pressure system, the required vacuum level is
measured in:
A. Inches of water column
B. Inches of mercury above zero
C. Inches of mercury vacuum
D. Microns absolute pressure
EPA mandates evacuation requirements in inches of mercury vacuum
for Type III.
4. What is the maximum allowable leak rate for low-pressure appliances?
A. 10% per year
B. 15% per year
C. 10% per year
D. 30% per year
The EPA leak rate threshold for low-pressure systems is 10% per year.
5. Which refrigerant is commonly used in low-pressure chillers?
A. R-410A
B. R-22
C. R-123
, D. R-404A
R-123 is widely used in centrifugal chillers as a low-pressure
refrigerant.
6. What is the purpose of a purge unit on a low-pressure system?
A. Add oil
B. Control temperature
C. Remove non-condensables
D. Add refrigerant
Purge units remove air and other non-condensable gases from the
chiller to maintain efficiency.
7. What can cause high system pressure in a low-pressure chiller?
A. Low water temperature
B. Excessive air in system
C. Low refrigerant charge
D. Faulty TXV
Air and other non-condensables raise condenser pressure in low-
pressure systems.
8. What is a key indication of non-condensables in a low-pressure chiller?
A. High suction pressure
B. High condenser pressure
C. Low evaporator pressure
D. Low oil pressure
Non-condensables collect in the condenser, increasing pressure.
, 9. Before recovering refrigerant from a low-pressure chiller, the water
box should be:
A. Left open
B. Isolated and drained
C. Heated
D. Pressurized
Isolating and draining prevents water contamination or pressure
damage during recovery.
10. What refrigerant state is typically recovered from low-pressure
systems?
A. Liquid only
B. Vapor only
C. Both liquid and vapor
D. None
Recovery occurs from both liquid and vapor phases to remove all
refrigerant.
11. When is refrigerant recovered as vapor from a low-pressure
system?
A. When liquid is exhausted
B. When system pressure is below atmospheric
C. When the chiller is running
D. When oil is added
Below atmospheric pressure, only vapor recovery is possible.
