100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
HVAC NATE Heat Pump/ 171 Q&A/ Already Graded A+ $9.99
Add to cart
Quickly navigate to
Preview
  2.  
  3. HVAC NATE Heat Pump
  4.  
  5. HVAC NATE Heat Pump

Exam (elaborations)

HVAC NATE Heat Pump/ 171 Q&A/ Already Graded A+

 0 purchase
  • Course
  • HVAC NATE Heat Pump
  • Institution
  • HVAC NATE Heat Pump

HVAC NATE Heat Pump/ 171 Q&A/ Already Graded A+ Terms like: On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that does not exceed what? - Answer: 6-7PSI or 6F What is the primary purpose of using flux when soldering copper or brass parts? - Answ...

[Show more]

Preview 3 out of 21  pages

Document information

  • October 21, 2024
  • 21
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

Written for

  • HVAC NATE Heat Pump
  • HVAC NATE Heat Pump

Seller

avatar-seller
Pronurse1

Reviews received

Content preview

HVAC NATE Heat Pump/ 171 Q&A/ 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? - Answer: 6-7PSI or 6F


What is the primary purpose of using flux when soldering copper or brass parts? - Answer:
Prevent Oxidation


The water that results from a defrost cycle of an air-to-air heat pump(runoff) must? - Answer:
Drain off and away from the outdoor coil.


Why must the runoff be drained o/’ff and away from the outdoor coil? - 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? - Answer: Curb Gasket




Page 1 of 21

,Why do you need to add a control for a heat pump indoor coil that is installed on a fossil fuel
furnace? - 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? - Answer: Motor windings could become damaged.


What needs to happen in order to consider an evacuation to be complete? - 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? - Answer: 6lbs


Where are drive slips typically installed? - Answer: On the shorter sides of rectangular duct.


What is a necessary check to properly set a heat anticipator? - 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? - Answer: Coil TD.


What is the smallest refrigerant leak that an electronic leak detector should be capable of
sensing? - Answer: .o5oz per year.




Page 2 of 21

, 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? - Answer: No


What is the absolute pressure at sea level if a gauge pressure is 35 psig? - Answer: 49.7psia


100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? - Answer: 1323CFM


What is the best method of repair when a residential supply diffuser is noisy because of a loose
vane? - Answer: Replace the diffuser.


When performing preventive maintenance on a heat pump what should the technician check
and why? - 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? - 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? - Answer: Restriction in the liquid line.


What is a reason for cool air complaints when a heat pump is operating in the heating cycle? -
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


Page 3 of 21

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Pronurse1. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $9.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67418 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$9.99
  • (0)
Add to cart
Added