HVAC NATE Heat Pump Exam with All Correct & 100%
Verified Answers |Actual Complete Exam| Already
Graded A+
On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that
does not exceed what? ✔Correct Answer-6-7PSI or 6F
What is the primary purpose of using flux when soldering copper or brass parts? ✔Correct
Answer-Prevent Oxidation
The water that results from a defrost cycle of an air to air heat pump(runoff) must? ✔Correct
Answer-Drain off and away from the outdoor coil.
Why must the runoff be drained off and away from the outdoor coil? ✔Correct 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? ✔Correct 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? ✔Correct 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? ✔Correct Answer-Motor windings could become damaged.
What needs to happen in order to consider an evacuation to be complete? ✔Correct 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? ✔Correct Answer-6lbs
Where are drive slips typically installed? ✔Correct Answer-On the shorter sides of rectangular
duct.
What is a necessary check to properly set a heat anticipator? ✔Correct 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? ✔Correct Answer-Coil TD.
What is the smallest refrigerant leak that an electronic leak detector should be capable of sensing?
✔Correct 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? ✔Correct Answer-No
What is the absolute pressure at sea level if a gauge pressure is 35 psig? ✔Correct Answer-49.7psia
100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? ✔Correct Answer-1323CFM
What is the best method of repair when a residential supply diffuser is noisy because of a loose
vane? ✔Correct Answer-Replace the diffuser.
When performing preventive maintenance on a heat pump what should the technician check and
why? ✔Correct Answer-Outdoor fan. To be certain it runs freely with no binding.
What is the effect of 170 volts supplied to a 208/230 volt compressor? ✔Correct Answer-Would
cause the current to 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. What is most likely to cause this? ✔Correct Answer-Restriction in the liquid
line.
What is a reason for cool air complaints when a heat pump is operating in the heating cycle?
✔Correct Answer-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. /auxiliary heat ON 115°F
• Return air temp. /auxiliary heat ON 70°F
• CFM 1228
What is the heating capacity in BTUH? ✔Correct Answer-29,177 BTU/H
Inadequate heating can be caused by what? ✔Correct Answer-Dirty or clogged air filter.
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? ✔Correct Answer-700 to
900 fpm
conditions while checking a packaged heat pump in cooling.
Verified Answers |Actual Complete Exam| Already
Graded A+
On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that
does not exceed what? ✔Correct Answer-6-7PSI or 6F
What is the primary purpose of using flux when soldering copper or brass parts? ✔Correct
Answer-Prevent Oxidation
The water that results from a defrost cycle of an air to air heat pump(runoff) must? ✔Correct
Answer-Drain off and away from the outdoor coil.
Why must the runoff be drained off and away from the outdoor coil? ✔Correct 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? ✔Correct 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? ✔Correct 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? ✔Correct Answer-Motor windings could become damaged.
What needs to happen in order to consider an evacuation to be complete? ✔Correct 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? ✔Correct Answer-6lbs
Where are drive slips typically installed? ✔Correct Answer-On the shorter sides of rectangular
duct.
What is a necessary check to properly set a heat anticipator? ✔Correct 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? ✔Correct Answer-Coil TD.
What is the smallest refrigerant leak that an electronic leak detector should be capable of sensing?
✔Correct 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? ✔Correct Answer-No
What is the absolute pressure at sea level if a gauge pressure is 35 psig? ✔Correct Answer-49.7psia
100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? ✔Correct Answer-1323CFM
What is the best method of repair when a residential supply diffuser is noisy because of a loose
vane? ✔Correct Answer-Replace the diffuser.
When performing preventive maintenance on a heat pump what should the technician check and
why? ✔Correct Answer-Outdoor fan. To be certain it runs freely with no binding.
What is the effect of 170 volts supplied to a 208/230 volt compressor? ✔Correct Answer-Would
cause the current to 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. What is most likely to cause this? ✔Correct Answer-Restriction in the liquid
line.
What is a reason for cool air complaints when a heat pump is operating in the heating cycle?
✔Correct Answer-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. /auxiliary heat ON 115°F
• Return air temp. /auxiliary heat ON 70°F
• CFM 1228
What is the heating capacity in BTUH? ✔Correct Answer-29,177 BTU/H
Inadequate heating can be caused by what? ✔Correct Answer-Dirty or clogged air filter.
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? ✔Correct Answer-700 to
900 fpm
conditions while checking a packaged heat pump in cooling.
