NATE AC Service Certification Questions & Answers(RATED A+)
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Course
NATE AC Service Cert
Institution
NATE AC Service Cert
A system is supplied from the factory with a charge of 5 pounds 10 ounces for a 15 foot line set. The line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant line set length. What is the total refrigerant ch...
NATE AC Service Certification
Questions & Answers(RATED A+)
A system is supplied from the factory with a charge of 5 pounds 10 ounces for a 15 foot line set. The
line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to
be added for each added foot of refrigerant line set length. What is the total refrigerant charge for
the system?
A. 6 ounces
B. 5 pounds
C. 5 pounds 10 ounces
D. 6 pounds - ANSWERD. 6 pounds
25ft - 15ft = 10ft
10ft x .6 = 6 ounces
5 pounds + 10 ounces + 6 ounces
5 pounds + 16 ounces = 6 pounds
Return air leakage in a hot attic will:
A. Increase capacity
B. Decrease capacity
C. Increase airflow
D. Decrease airflow - ANSWERB. Decrease capacity
Which of the following substances could create an extremely dangerous condition if used to check
refrigeration system for leaks?
A. R-22
B. Nitrogen
C. Oxygen
D. Carbon Dioxide - ANSWERD. Carbon Dioxide
, On a 3 ton unit installation, the measure airflow equals 1550 CFM. What does this indicate?
A. Proper balancing
B. Low Airflow
C. Excess airflow
D. Improper balancing - ANSWERC. Excess airflow(400cfm per ton, 3 ton=1200cfm)
What will refrigerant oil in a hose cause when a technician is checking the pressures in an operation
system with a manifold gauge set?
A. All readings on that gauge will increase in value.
B. All readings on that gauge will decrease in value.
C. All readings on that gauge will not be affected.
D. The gauge will read 0 psig. - ANSWERC. All readings on that gauge will not be affected.
Which of the following is a likely problem if the air across the evaporator of an air conditioner has a
high temperature differential?
A. Too much charge
B. Clogged expansion valve
C. Dirty filter or evaporator
D. Dirty condenser coil - ANSWERC
When performing a cycling check during a maintenance call, the technician should first check with
the owner of the equipment for their opinion of performance. The next step is to turn the unit off at
the thermostat SYSTEM switch. The technician should set the FAN switch to:
A. AUTO and measure the voltage from the R to G terminal.
B. ON and measure the voltage from the R to the W1 terminal.
C. ON and check that the blower is running.
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