NATE HEAT PUMP RETAIL 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 prevent 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 an 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 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 so:
The total refrigerant 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 pressures 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 diffuser.
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 inspections find a liquid line that has
condensation on it:
The most likely cause would be the liquid line is restricted.
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 prevent 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 an 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 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 so:
The total refrigerant 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 pressures 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 diffuser.
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 inspections find a liquid line that has
condensation on it:
The most likely cause would be the liquid line is restricted.
