NATE Heat Pump Exam 2024 Questions with
100% Correct Answers
R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop that does not
exceed...
6-7 psi or 6°F
The primary purpose of using flux when soldering copper or brass parts is to...
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...
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...
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...
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...
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...
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...
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...
the shorter sides of rectangular duct
To properly set a heat anticipator it is necessary to 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. This temperature
difference is referred to as...
coil TD
, The smallest refrigerant leak that an electronic leak detector should be capable of sensing is...
0.05 oz. per year
When checking the pressure in an operating system with a manifold gauge set...
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 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...
1323
A residential supply diffuser that is noisy because of a loose vane is best serviced by...
replacing the filter
When performing preventive maintenance on a heat pump the technician should...
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 ...
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 inspection find a liquid line that has
condensation on it. The most likely cause would be...
the liquid linen is restricted
A reason for cool air complaints when a heat pump is operating in the heating cycle is...
excessive supply air velocities
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 temperature 92(F)
- Heat pump only return air temperature 70(F)
- Outdoor temperature 54(F)
- Supply air temp / aux heat on 115(F)
- Return air temp / auxillary heat on 70(F)
- CFM 1228
The heating capacity of the unit in BTUh would be...
29,177 BTUh
A dirty or clogged air filter in an operating heat pump system can...
be caused by inadequate heating
To minimize noise problems in residential duct systems, what is the range (recommended to
maximum) of design air velocity in the rectangular main supply trunk...
100% Correct Answers
R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop that does not
exceed...
6-7 psi or 6°F
The primary purpose of using flux when soldering copper or brass parts is to...
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...
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...
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...
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...
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...
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...
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...
the shorter sides of rectangular duct
To properly set a heat anticipator it is necessary to 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. This temperature
difference is referred to as...
coil TD
, The smallest refrigerant leak that an electronic leak detector should be capable of sensing is...
0.05 oz. per year
When checking the pressure in an operating system with a manifold gauge set...
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 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...
1323
A residential supply diffuser that is noisy because of a loose vane is best serviced by...
replacing the filter
When performing preventive maintenance on a heat pump the technician should...
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 ...
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 inspection find a liquid line that has
condensation on it. The most likely cause would be...
the liquid linen is restricted
A reason for cool air complaints when a heat pump is operating in the heating cycle is...
excessive supply air velocities
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 temperature 92(F)
- Heat pump only return air temperature 70(F)
- Outdoor temperature 54(F)
- Supply air temp / aux heat on 115(F)
- Return air temp / auxillary heat on 70(F)
- CFM 1228
The heating capacity of the unit in BTUh would be...
29,177 BTUh
A dirty or clogged air filter in an operating heat pump system can...
be caused by inadequate heating
To minimize noise problems in residential duct systems, what is the range (recommended to
maximum) of design air velocity in the rectangular main supply trunk...
