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HVAC NATE Heat Pump Questions and Answers | Latest Update
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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 ...

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  • September 27, 2024
  • 36
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • hvac nate heat pump questions and answers lates
  • on an r 22 system line diameters and lengths are

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2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!

HVAC NATE Heat Pump Questions and
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



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,2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!


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 added foot of refrigerant line length. How much refrigerant

is needed to completely charge the system?


✓ 6lbs




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,2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!
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



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, 2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!
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.




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?




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