HVAC NATE Heat Pump Exam Questions & Answers Latest Update
HVAC NATE Heat Pump Exam Questions
& Answers Latest Update.
On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that
does not exceed what? - ✔✔✔ - 6-7PSI or 6F
What is the primary purpose of using flux when soldering copper or brass parts? - ✔✔✔ - 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.
Why must the runoff be drained off and away from the outdoor coil? - ✔✔✔ - 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? - ✔✔✔ - Curb Gasket
Why do you need to add a control for a heat pump indoor coil that is installed on a fossil fuel furnace? -
✔✔✔ - 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? - ✔✔✔ - Motor windings could become damaged.
What needs to happen in order to consider an evacuation to be complete? - ✔✔✔ - 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
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,HVAC NATE Heat Pump Exam Questions & Answers Latest Update
added foot of refrigerant line length. How much refrigerant is needed to completely charge the
system? - ✔✔✔ - 6lbs
Where are drive slips typically installed? - ✔✔✔ - On the shorter sides of rectangular duct.
What is a necessary check to properly set a heat anticipator? - ✔✔✔ - 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? - ✔✔✔ - Coil TD.
What is the smallest refrigerant leak that an electronic leak detector should be capable of sensing? -
✔✔✔ - .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? - ✔✔✔ - No
What is the absolute pressure at sea level if a gauge pressure is 35 psig? - ✔✔✔ - 49.7psia
100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? - ✔✔✔ - 1323CFM
What is the best method of repair when a residential supply diffuser is noisy because of a loose vane? -
✔✔✔ - Replace the diffuser.
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, HVAC NATE Heat Pump Exam Questions & Answers Latest Update
When performing preventive maintenance on a heat pump what should the technician check and why?
- ✔✔✔ - 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? - ✔✔✔ - 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? - ✔✔✔ - Restriction in the liquid line.
What is a reason for cool air complaints when a heat pump is operating in the heating cycle? - ✔✔✔ -
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
©®™ Page 3
HVAC NATE Heat Pump Exam Questions
& Answers Latest Update.
On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that
does not exceed what? - ✔✔✔ - 6-7PSI or 6F
What is the primary purpose of using flux when soldering copper or brass parts? - ✔✔✔ - 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.
Why must the runoff be drained off and away from the outdoor coil? - ✔✔✔ - 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? - ✔✔✔ - Curb Gasket
Why do you need to add a control for a heat pump indoor coil that is installed on a fossil fuel furnace? -
✔✔✔ - 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? - ✔✔✔ - Motor windings could become damaged.
What needs to happen in order to consider an evacuation to be complete? - ✔✔✔ - 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
©®™ Page 1
,HVAC NATE Heat Pump Exam Questions & Answers Latest Update
added foot of refrigerant line length. How much refrigerant is needed to completely charge the
system? - ✔✔✔ - 6lbs
Where are drive slips typically installed? - ✔✔✔ - On the shorter sides of rectangular duct.
What is a necessary check to properly set a heat anticipator? - ✔✔✔ - 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? - ✔✔✔ - Coil TD.
What is the smallest refrigerant leak that an electronic leak detector should be capable of sensing? -
✔✔✔ - .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? - ✔✔✔ - No
What is the absolute pressure at sea level if a gauge pressure is 35 psig? - ✔✔✔ - 49.7psia
100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? - ✔✔✔ - 1323CFM
What is the best method of repair when a residential supply diffuser is noisy because of a loose vane? -
✔✔✔ - Replace the diffuser.
©®™ Page 2
, HVAC NATE Heat Pump Exam Questions & Answers Latest Update
When performing preventive maintenance on a heat pump what should the technician check and why?
- ✔✔✔ - 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? - ✔✔✔ - 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? - ✔✔✔ - Restriction in the liquid line.
What is a reason for cool air complaints when a heat pump is operating in the heating cycle? - ✔✔✔ -
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
©®™ Page 3
