NATE AC Service Certification Exam Latest 2026
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Terms in this set (99)
A system is supplied from the D. 6 pounds
factory with charge of 5 pounds 10
ounces for a 15 foot line set. The 15ft - 25ft = 10ft x .6 = 6 ounces
line set is 25 feet long. The 5 pounds + 10 ounces + 6 ounces
manufacturer's instruction sheet 5 pounds + 16 ounces = 6 pounds
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
The purpose of using flux when C. reduce oxidation.
soldering is to:
A. anneal the surface.
B. give better heat flow.
C. reduce oxidation.
D. pre-seal the oxidation.
,Outdoor condensing units that are A. be mounted above flood level.
installed in areas where flooding is
possible must:
A. be mounted above flood level.
B. utilize NEMA 1 enclosures.
C. be mounted under an
overhanging eave.
D. use water resistant components.
The component used to reduce A. curb gasket.
sound transmission and prevent
water leaks on a rooftop air
conditioner packaged unit
installation is the:
A. curb gasket.
B. silicone caulk.
C. roof flashing.
D. roofing tar.
Return air leakage in a hot attic will: B. Decrease capacity
A. Increase capacity
B. Decrease capacity
C. Increase airflow
D. Decrease airflow
An air conditioner refrigerant circuit C. 500 microns.
should be evacuated to a minimum
of:
A. 0 microns.
B. 200 microns.
C. 500 microns.
D. 1200 microns.
,Which of the following substances D. Carbon Dioxide
could create an extremely
dangerous condition if used to
check refrigeration system for
leaks?
A. R-22
B. Nitrogen
C. Oxygen
D. Carbon Dioxide
The subcooling method for B. Any thermostatic expansion valve
checking charge is generally used
on air conditioners with what type
of metering?
A. Only externally equalized
thermostatic expansion valves
B. Any thermostatic expansion valve
C. Piston type
D. Any fixed metering device
Supply ducts running through C. a vapor barrier.
unconditioned space should be
insulated and have:
A. equal friction.
B. excessive air velocity.
C. a vapor barrier.
D. a transition backing.
, An important consideration when C. the vanes operate without binding.
installing a motorized economizer
is to check to be certain that:
A. the vanes are set for a maximum
10% outdoor air.
B. the vanes open on any call for
cooling.
C. the vanes operate without
binding.
D. the vanes are permanently set at
50%.
On a 3 ton unit installation, the C. Excess airflow(400cfm per ton, 3 ton=1200cfm)
measure airflow equals 1550 CFM.
What does this indicate?
A. Proper balancing
B. Low Airflow
C. Excess airflow
D. Improper balancing
Electronic type leak detectors C. setting the detector for use in environments
typically have a push-button or with ambient refrigerant vapor.
knob for setting a reference
refrigerant level. This feature is
useful for:
A. adjusting the detector after
installing a new battery.
B. checking the factory calibration
of the instrument.
C. setting the detector for use in
environments with ambient
refrigerant vapor.
D. adjusting the detector for the
type refrigerant to be checked.
Actual Questions & Verified Answers (Latest
Update) A+ Grade 100% Guarantee
Verified by Experts
Save
Terms in this set (99)
A system is supplied from the D. 6 pounds
factory with charge of 5 pounds 10
ounces for a 15 foot line set. The 15ft - 25ft = 10ft x .6 = 6 ounces
line set is 25 feet long. The 5 pounds + 10 ounces + 6 ounces
manufacturer's instruction sheet 5 pounds + 16 ounces = 6 pounds
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
The purpose of using flux when C. reduce oxidation.
soldering is to:
A. anneal the surface.
B. give better heat flow.
C. reduce oxidation.
D. pre-seal the oxidation.
,Outdoor condensing units that are A. be mounted above flood level.
installed in areas where flooding is
possible must:
A. be mounted above flood level.
B. utilize NEMA 1 enclosures.
C. be mounted under an
overhanging eave.
D. use water resistant components.
The component used to reduce A. curb gasket.
sound transmission and prevent
water leaks on a rooftop air
conditioner packaged unit
installation is the:
A. curb gasket.
B. silicone caulk.
C. roof flashing.
D. roofing tar.
Return air leakage in a hot attic will: B. Decrease capacity
A. Increase capacity
B. Decrease capacity
C. Increase airflow
D. Decrease airflow
An air conditioner refrigerant circuit C. 500 microns.
should be evacuated to a minimum
of:
A. 0 microns.
B. 200 microns.
C. 500 microns.
D. 1200 microns.
,Which of the following substances D. Carbon Dioxide
could create an extremely
dangerous condition if used to
check refrigeration system for
leaks?
A. R-22
B. Nitrogen
C. Oxygen
D. Carbon Dioxide
The subcooling method for B. Any thermostatic expansion valve
checking charge is generally used
on air conditioners with what type
of metering?
A. Only externally equalized
thermostatic expansion valves
B. Any thermostatic expansion valve
C. Piston type
D. Any fixed metering device
Supply ducts running through C. a vapor barrier.
unconditioned space should be
insulated and have:
A. equal friction.
B. excessive air velocity.
C. a vapor barrier.
D. a transition backing.
, An important consideration when C. the vanes operate without binding.
installing a motorized economizer
is to check to be certain that:
A. the vanes are set for a maximum
10% outdoor air.
B. the vanes open on any call for
cooling.
C. the vanes operate without
binding.
D. the vanes are permanently set at
50%.
On a 3 ton unit installation, the C. Excess airflow(400cfm per ton, 3 ton=1200cfm)
measure airflow equals 1550 CFM.
What does this indicate?
A. Proper balancing
B. Low Airflow
C. Excess airflow
D. Improper balancing
Electronic type leak detectors C. setting the detector for use in environments
typically have a push-button or with ambient refrigerant vapor.
knob for setting a reference
refrigerant level. This feature is
useful for:
A. adjusting the detector after
installing a new battery.
B. checking the factory calibration
of the instrument.
C. setting the detector for use in
environments with ambient
refrigerant vapor.
D. adjusting the detector for the
type refrigerant to be checked.
