NATE AC Service Certification Questions & Answers Already Passed
8 views 0 purchase
Course
NATE AC Service Certification
Institution
NATE AC Service Certification
A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15 foot line set. The line
set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added
for each added foot of refrigerant line set length. What is the total refrigerant ch...
NATE AC Service Certification A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15 foot line set. The line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant line set length. What is the total refrigerant charge for the system? A. 6 ounces B. 5 pounds C. 5 pounds 10 ounces D. 6 pounds - D. 6 pounds 15ft - 25ft = 10ft x .6 = 6 ounces 5 pounds + 10 ounces + 6 ounces 5 pounds + 16 ounces = 6 pounds The purpose of using flux when soldering is to: A. anneal the surface. B. give better heat flow. C. reduce oxidation. D. pre -seal the oxidation. - C. reduce oxidation. Outdoor condensing units that are installed in areas where flooding is possible must: A. be mounted above flood level. B. utilize NEMA 1 enclosures. C. be mounted under an overhanging eave. D. use water resistant components. - A. be mounted above flood level. The component used to reduce sound transmission and prevent water leaks on a rooftop air conditioner packaged unit installation is the: A. curb gasket. B. silicone caulk. C. roof flashing. D. roofing tar. - A. curb gasket. Return air leakage in a hot attic will: A. Increase capacity B. Decrease capacity C. Increase airflow D. Decrease airflow - B. Decrease capacity An air conditioner refrigerant circuit should be evacuated to a minimum of: A. 0 microns. B. 200 microns. C. 500 microns. D. 1200 microns. - C. 500 microns. Which of the following substances could create an extremely dangerous condition if used to check refrigeration system for leaks? A. R-22 B. Nitrogen C. Oxygen D. Carbon Dioxide - D. Carbon Dioxide The subcooling method for checking charge is generally used on air conditioners with what type of metering? A. Only externally equalized thermostatic expansion valves B. Any thermostatic expansion valve C. Piston type D. Any fixed metering device - B. Any thermostatic expansion valve Supply ducts running through unconditioned space should be insulated and have: A. equal friction. B. excessive air velocity. C. a vapor barrier. D. a transition backing. - C. a vapor barrier. An important consideration when installing a motorized economizer is to check to be certain that: A. the vanes are set for a maximum 10% outdoor air. B. the vanes open on any call for cooling. C. the vanes operate without binding. D. the vanes are permanently set at 50%. - C. the vanes operate without binding. On a 3 ton unit installation, the measure airflow equals 1550 CFM. What does this indicate? A. Proper balancing B. Low Airflow C. Excess airflow D. Improper balancing - C. Excess airflow(400cfm per ton, 3 ton=1200cfm)
The benefits of buying summaries with Stuvia:
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
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
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 this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ACADEMICMATERIALS. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R149,69. You're not tied to anything after your purchase.
