HVAC NATE HEAT PUMP 171 2026 TEST PAPER
PRACTICE QUESTIONS AND COMPREHENSIVE
SOLUTION SET
◉ The primary purpose of using flux when soldering copper or
brass parts is to... Answer: Prevent oxidation
◉ The water that results from a defrost cycle of an air to air heat
pump (runoff) must drain off and away from the outdoor coil to...
Answer: Prevent excessive ice can build up on the bottom of the coil
and reduce capacity
◉ The component used to reduce sound transmission and regent
water leaks of a packaged heat pump installed on a roof is... Answer:
The 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... Answer: Add a control so that 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... Answer: Be damaged if
energized
◉ In order for evacuation to be considered complete, a heat pump
refrigerant circuit should be evacuated to a vacuum pressure of...
Answer: 500 microns or below
◉ A system is supplied from the factory with charge for a 15 foot
line set. The data plate shows the required system charge o be 5
pounds 10oz. The line set uses a 3/8 inch liquid line and is 25 feet
long. The manufacturer's instruction she specifies 0.6 oz of
refrigerant to be added for... Answer: each added foot of refrigerant
line length so the total regrigerrant charge for the system would be 6
pounds
◉ Drive slips are typically installed on... Answer: the shorter sides of
rectangular duct
◉ To properly set a heat anticipator it is necessary to check...
Answer: 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. This
temperature difference is referred to as... Answer: coil TD
, ◉ The smallest refrigerant leak that an electronic leak detector
should be capable of sensing is... Answer: 0.05 oz. per year
◉ When checking the pressure 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 ... Answer: an
absolute pressure of 49.7 psia
◉ A technician measures the return air temperature of a 100,000
BTU output furnace to be 65(F) and the supply side air temperature
is 135(F). The CFM would be... Answer: 1323
◉ A residential supply diffuser that is noisy because of a loose vane
is best serviced by... Answer: replacing the filter
◉ When performing preventive maintenance on a heat pump the
technician should... Answer: check the outdoor fan to be certain that
the 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
PRACTICE QUESTIONS AND COMPREHENSIVE
SOLUTION SET
◉ The primary purpose of using flux when soldering copper or
brass parts is to... Answer: Prevent oxidation
◉ The water that results from a defrost cycle of an air to air heat
pump (runoff) must drain off and away from the outdoor coil to...
Answer: Prevent excessive ice can build up on the bottom of the coil
and reduce capacity
◉ The component used to reduce sound transmission and regent
water leaks of a packaged heat pump installed on a roof is... Answer:
The 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... Answer: Add a control so that 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... Answer: Be damaged if
energized
◉ In order for evacuation to be considered complete, a heat pump
refrigerant circuit should be evacuated to a vacuum pressure of...
Answer: 500 microns or below
◉ A system is supplied from the factory with charge for a 15 foot
line set. The data plate shows the required system charge o be 5
pounds 10oz. The line set uses a 3/8 inch liquid line and is 25 feet
long. The manufacturer's instruction she specifies 0.6 oz of
refrigerant to be added for... Answer: each added foot of refrigerant
line length so the total regrigerrant charge for the system would be 6
pounds
◉ Drive slips are typically installed on... Answer: the shorter sides of
rectangular duct
◉ To properly set a heat anticipator it is necessary to check...
Answer: 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. This
temperature difference is referred to as... Answer: coil TD
, ◉ The smallest refrigerant leak that an electronic leak detector
should be capable of sensing is... Answer: 0.05 oz. per year
◉ When checking the pressure 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 ... Answer: an
absolute pressure of 49.7 psia
◉ A technician measures the return air temperature of a 100,000
BTU output furnace to be 65(F) and the supply side air temperature
is 135(F). The CFM would be... Answer: 1323
◉ A residential supply diffuser that is noisy because of a loose vane
is best serviced by... Answer: replacing the filter
◉ When performing preventive maintenance on a heat pump the
technician should... Answer: check the outdoor fan to be certain that
the 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
