HVAC NATE HEAT PUMP ACTUAL EXAM PAPER
2026 QUESTIONS WITH SOLUTIONS GRADED
A+
◉ What is the primary purpose of using flux when soldering copper or
brass parts? Answer: Prevent Oxidation
◉ The water that results from a defrost cycle of an air to air heat
pump(runoff) must? Answer: Drain off and away from the outdoor coil.
◉ Why must the runoff be drained off and away from the outdoor coil?
Answer: Excessive ice can build up on the bottom of the coil and can
reduce capacity.
◉ What is the component that reduces sound transmission and prevents
water leaks of a package heat pump installed on a roof? Answer: Curb
Gasket
◉ Why do you need to add a control for a heat pump indoor coil that is
installed on a fossil fuel furnace? Answer: So the heat pump and furnace
do not operate at the same time in normal heating.
,◉ What happens when you energize a hermetic refrigeration compressor
and the system is in a deep vacuum? Answer: Motor windings could
become damaged.
◉ What needs to happen in order to consider an evacuation to be
complete? Answer: System should be evacuated to a vacuum of 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 to be 5 pounds 10
ounces. The line set uses a 3/8 inch liquid line and is 25 feet long. The
manufacturer's instruction sheet specifies 0.6 ounces of refrigerant to be
added for each added foot of refrigerant line length. How much
refrigerant is needed to completely charge the system? Answer: 6lbs
◉ Where are drive slips typically installed? Answer: On the shorter sides
of rectangular duct.
◉ What is a necessary check to properly set a heat anticipator? Answer:
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. What is this temperature referred to
as? Answer: Coil TD.
, ◉ What is the smallest refrigerant leak that an electronic leak detector
should be capable of sensing? Answer: .o5oz per year.
◉ When checking the pressures in an operating system with a manifold
gauge set, will refrigerant oil in a hose will have an effect on the gauge?
Answer: No
◉ What is the absolute pressure at sea level if a gauge pressure is 35
psig? Answer: 49.7psia
◉ 100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? Answer: 1323CFM
◉ What is the best method of repair when a residential supply diffuser is
noisy because of a loose vane? Answer: Replace the diffuser.
◉ When performing preventive maintenance on a heat pump what
should the technician check and why? Answer: Outdoor fan. To be
certain it runs freely with no binding.
2026 QUESTIONS WITH SOLUTIONS GRADED
A+
◉ What is the primary purpose of using flux when soldering copper or
brass parts? Answer: Prevent Oxidation
◉ The water that results from a defrost cycle of an air to air heat
pump(runoff) must? Answer: Drain off and away from the outdoor coil.
◉ Why must the runoff be drained off and away from the outdoor coil?
Answer: Excessive ice can build up on the bottom of the coil and can
reduce capacity.
◉ What is the component that reduces sound transmission and prevents
water leaks of a package heat pump installed on a roof? Answer: Curb
Gasket
◉ Why do you need to add a control for a heat pump indoor coil that is
installed on a fossil fuel furnace? Answer: So the heat pump and furnace
do not operate at the same time in normal heating.
,◉ What happens when you energize a hermetic refrigeration compressor
and the system is in a deep vacuum? Answer: Motor windings could
become damaged.
◉ What needs to happen in order to consider an evacuation to be
complete? Answer: System should be evacuated to a vacuum of 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 to be 5 pounds 10
ounces. The line set uses a 3/8 inch liquid line and is 25 feet long. The
manufacturer's instruction sheet specifies 0.6 ounces of refrigerant to be
added for each added foot of refrigerant line length. How much
refrigerant is needed to completely charge the system? Answer: 6lbs
◉ Where are drive slips typically installed? Answer: On the shorter sides
of rectangular duct.
◉ What is a necessary check to properly set a heat anticipator? Answer:
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. What is this temperature referred to
as? Answer: Coil TD.
, ◉ What is the smallest refrigerant leak that an electronic leak detector
should be capable of sensing? Answer: .o5oz per year.
◉ When checking the pressures in an operating system with a manifold
gauge set, will refrigerant oil in a hose will have an effect on the gauge?
Answer: No
◉ What is the absolute pressure at sea level if a gauge pressure is 35
psig? Answer: 49.7psia
◉ 100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? Answer: 1323CFM
◉ What is the best method of repair when a residential supply diffuser is
noisy because of a loose vane? Answer: Replace the diffuser.
◉ When performing preventive maintenance on a heat pump what
should the technician check and why? Answer: Outdoor fan. To be
certain it runs freely with no binding.
