HVAC NATE HEAT PUMP COMPREHENSIVE
EXAM 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◉ 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
,◉ 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
◉ 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
EXAM 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◉ 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
,◉ 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
◉ 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
