NATE HEAT PUMP EXAM QUESTIONS
AND ANSWERS (VERIFIED AND
UPDATED)
R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop that does
not exceed... - ANS 6-7 psi or 6°F
The primary purpose of using flux when soldering copper or brass parts is to... - ANS 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... - ANS 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... - ANS 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... - ANS 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... -
ANS Be damaged if energized
@2026/2027 ALLRIGHTS RESERVED.
, In order for evacuation to be considered complete, a heat pump refrigerant circuit should be
evacuated to a vacuum pressure of... - ANS 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... -
ANS 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... - ANS the shorter sides of rectangular duct
To properly set a heat anticipator it is necessary to check... - ANS 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... - ANS coil TD
The smallest refrigerant leak that an electronic leak detector should be capable of sensing is... -
ANS 0.05 oz. per year
When checking the pressure in an operating system with a manifold gauge set... -
ANS 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 ... - ANS 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... - ANS 1323
A residential supply diffuser that is noisy because of a loose vane is best serviced by... -
ANS replacing the filter
@2026/2027 ALLRIGHTS RESERVED.
AND ANSWERS (VERIFIED AND
UPDATED)
R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop that does
not exceed... - ANS 6-7 psi or 6°F
The primary purpose of using flux when soldering copper or brass parts is to... - ANS 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... - ANS 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... - ANS 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... - ANS 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... -
ANS Be damaged if energized
@2026/2027 ALLRIGHTS RESERVED.
, In order for evacuation to be considered complete, a heat pump refrigerant circuit should be
evacuated to a vacuum pressure of... - ANS 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... -
ANS 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... - ANS the shorter sides of rectangular duct
To properly set a heat anticipator it is necessary to check... - ANS 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... - ANS coil TD
The smallest refrigerant leak that an electronic leak detector should be capable of sensing is... -
ANS 0.05 oz. per year
When checking the pressure in an operating system with a manifold gauge set... -
ANS 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 ... - ANS 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... - ANS 1323
A residential supply diffuser that is noisy because of a loose vane is best serviced by... -
ANS replacing the filter
@2026/2027 ALLRIGHTS RESERVED.
