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NATE Heat Pump Exam 2026- 2027 Questions and
Correct Answers Rated A+
R-22 vapor line diameters and lengths are typically specified for a... - ANSWER
-Vapor pressure drop that does not exceed a 6-7psi or 6 degrees F
The primary purpose of using flux when soldering copper or brass parts is... -
ANSWER To prevent oxidation
The water that results from a defrost cycle of an air to air heat pump(runoff)
must... - ANSWER Drain off and away fro the outdoor coil to prevent excessive
ice build up on the bottom of the coil and reduce capacity
The component used to reduce sound transmission and prevent water leaks of a
packaged heat pump installed on a roof is... - ANSWER -Curb Gasket
On some installations, a heat pump indoor coil can be installed on an existing,
operable, fossil fuel furnace. When this type of installation is done, you need to
add a control so that... - ANSWER -The furnace and heat pump do not operate at
the same time in normal heating
When under a deep vacuum, a hermetic refrigeration compressor's motor windings
could be... - ANSWER -Damaged if energized
,2 | Page
In order for an evacuation to be considered complete... - ANSWER -A heat pump
refrigeration circuit should be evacuated to a vacuum pressure of 500 microns or
below
A system is supplied from the factory with charge for a 15 FOOT LINESET. The
data plate shows the required system charge to be 5 POUNDS 10 OUNCES. The
lineset uses 3/8 inch liquid line and is 25 FEET LONG. The manufacturers
instruction sheet specifies 0.6 ounces of refrigerant to be added for each added
foot of refrigerant line length so... - ANSWER -The total refrigerant charge for
the system would be 6 pounds
Drive slips are typically installed on the... - ANSWER -Shorter sides of
rectangular duct
To properly set a heat anticipator, it is necessary to... - ANSWER -Check the
heating control circuit amperage draw.
A heat pump operating in normal ice free conditions maintains a certain
temperature difference between the outdoor coil temperature and the surrounding
outdoor ambient... - ANSWER -This temperature difference is referred to as coil
TD
The smallest refrigerant leak that an electronic leak detector should be capable of
sensing is... - ANSWER -1/2 an ounce a year
When checking the pressures in an operating system with a manifold gauge set... -
ANSWER Refrigerant oil in a hose will have no effect on the gauge reading
,3 | Page
At sea level, a gauge pressure of 35 psig is equal to an... - ANSWER -Absolute
pressure of 49,7 psia
A technician measures the return air temperature of a 100,000 Btu output furnace
to be 65F and the supply side air temperature is 135F... - ANSWER -The CFM
should be 1323
A residential supply diffuser that is noisy because of a loose vane is best serviced
by... - ANSWER Replacing the diffuser
When performing preventive maintenance on a heat pump the technician should
check the outdoor fan to be certain that the... - ANSWER Fan runs freely with no
binding
What is the effect of 170 volts supplied to a 208/230 volt compressor... -
ANSWER -Would cause a current increase and the motor may trip on overload
On a service call for a cooling problem with a heat pump, your inspections find a
liquid line that has condensation on it... - ANSWER -The most likely cause would
be the liquid line is restricted
A reason for cool air complaints when a heat pump is operating in the heating
cycle... - ANSWER -
Excessive supply air velocities
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The following measurements are recorded on an operating heat pump system. The
heat pump is operating with the compressor only with no auxiliary heat
Heat pump only supply air temp.- 92F
Heat pump only return air temp.-70F
Outdoor temp.-54F
Supply air temp./ AUX heat ON- 115F
Return air temp./ AUX heat ON- 70F
CFM- 1228 - ANSWER -The heating capacity of the unit in would be 29,177
A dirty or clogged air filter in an operating heat pump system can cause... -
ANSWER Inadequate heating
To minimize noise problems in residential systems, what is the
range(recommended to maximum) of design air velocity in the rectangular main
supply trunk... - ANSWER -700900fpm
Proper ductwork connections and sealing is critical to good system performance.
Conditions are... - ANSWER -Return side air leak of 15% in a ventilated attic, 2.5
ton system rated at 1000 cfm, attic air- 95F
A technician has the following conditions while checking a packaged heat pump in
cooling
Piston-type metering device on both the indoor and outdoor coils
Outdoor temp.-75F
NATE Heat Pump Exam 2026- 2027 Questions and
Correct Answers Rated A+
R-22 vapor line diameters and lengths are typically specified for a... - ANSWER
-Vapor pressure drop that does not exceed a 6-7psi or 6 degrees F
The primary purpose of using flux when soldering copper or brass parts is... -
ANSWER To prevent oxidation
The water that results from a defrost cycle of an air to air heat pump(runoff)
must... - ANSWER Drain off and away fro the outdoor coil to prevent excessive
ice build up on the bottom of the coil and reduce capacity
The component used to reduce sound transmission and prevent water leaks of a
packaged heat pump installed on a roof is... - ANSWER -Curb Gasket
On some installations, a heat pump indoor coil can be installed on an existing,
operable, fossil fuel furnace. When this type of installation is done, you need to
add a control so that... - ANSWER -The furnace and heat pump do not operate at
the same time in normal heating
When under a deep vacuum, a hermetic refrigeration compressor's motor windings
could be... - ANSWER -Damaged if energized
,2 | Page
In order for an evacuation to be considered complete... - ANSWER -A heat pump
refrigeration circuit should be evacuated to a vacuum pressure of 500 microns or
below
A system is supplied from the factory with charge for a 15 FOOT LINESET. The
data plate shows the required system charge to be 5 POUNDS 10 OUNCES. The
lineset uses 3/8 inch liquid line and is 25 FEET LONG. The manufacturers
instruction sheet specifies 0.6 ounces of refrigerant to be added for each added
foot of refrigerant line length so... - ANSWER -The total refrigerant charge for
the system would be 6 pounds
Drive slips are typically installed on the... - ANSWER -Shorter sides of
rectangular duct
To properly set a heat anticipator, it is necessary to... - ANSWER -Check the
heating control circuit amperage draw.
A heat pump operating in normal ice free conditions maintains a certain
temperature difference between the outdoor coil temperature and the surrounding
outdoor ambient... - ANSWER -This temperature difference is referred to as coil
TD
The smallest refrigerant leak that an electronic leak detector should be capable of
sensing is... - ANSWER -1/2 an ounce a year
When checking the pressures in an operating system with a manifold gauge set... -
ANSWER Refrigerant oil in a hose will have no effect on the gauge reading
,3 | Page
At sea level, a gauge pressure of 35 psig is equal to an... - ANSWER -Absolute
pressure of 49,7 psia
A technician measures the return air temperature of a 100,000 Btu output furnace
to be 65F and the supply side air temperature is 135F... - ANSWER -The CFM
should be 1323
A residential supply diffuser that is noisy because of a loose vane is best serviced
by... - ANSWER Replacing the diffuser
When performing preventive maintenance on a heat pump the technician should
check the outdoor fan to be certain that the... - ANSWER Fan runs freely with no
binding
What is the effect of 170 volts supplied to a 208/230 volt compressor... -
ANSWER -Would cause a current increase and the motor may trip on overload
On a service call for a cooling problem with a heat pump, your inspections find a
liquid line that has condensation on it... - ANSWER -The most likely cause would
be the liquid line is restricted
A reason for cool air complaints when a heat pump is operating in the heating
cycle... - ANSWER -
Excessive supply air velocities
, 4 | Page
The following measurements are recorded on an operating heat pump system. The
heat pump is operating with the compressor only with no auxiliary heat
Heat pump only supply air temp.- 92F
Heat pump only return air temp.-70F
Outdoor temp.-54F
Supply air temp./ AUX heat ON- 115F
Return air temp./ AUX heat ON- 70F
CFM- 1228 - ANSWER -The heating capacity of the unit in would be 29,177
A dirty or clogged air filter in an operating heat pump system can cause... -
ANSWER Inadequate heating
To minimize noise problems in residential systems, what is the
range(recommended to maximum) of design air velocity in the rectangular main
supply trunk... - ANSWER -700900fpm
Proper ductwork connections and sealing is critical to good system performance.
Conditions are... - ANSWER -Return side air leak of 15% in a ventilated attic, 2.5
ton system rated at 1000 cfm, attic air- 95F
A technician has the following conditions while checking a packaged heat pump in
cooling
Piston-type metering device on both the indoor and outdoor coils
Outdoor temp.-75F
