Hvacr unit 3 - Study guides, Class notes & Summaries

An ----- should be taken and ----- if a system has a major component failure. - Answer oil sample analyzed (evacuation) The system vacuum gauge should be connected ----- from the vacuum pump. - Answer far as possible To receive any certification, which section must be passed? - Answer Section A (core) Always review the -----, when working with any solvents, chemicals, or refrigerants - Answer material safety data sheets Cylinders should be transported in an ----- position - Answer u...

In HVACR terms, what is a feature? - A special characteristic of a product. In HVACR terms, what is a benefit? - The value the customer receives from using the feature What type of temperature is often used by customers when discussing human comfort? - Dry bulb What is an honest person? - A person who is free from fraud or deception, credible, and is marked with integrity. An honest person is fair in their dealings with other people. What is the unit of electrical pressure? - Vo...

What are the five basic components to any schematic? - 1. A power supply 2. A path for the power 3. A load or component that operates from the power. 4. A switch or component that interrupts the power to the load. 5. A legend or key that explains what the various symbols and abbreviations used in the schematic mean. What are the three basic types of wiring diagrams used in the HVACR trade? - 1. The ladder diagram 2. The pictorial diagram 3. The installation diagram Describe the cha...

HVACR Unit 13 – Compressors Questions and Answers List the major types of compressors by mechanical design. Rotary, reciprocating, scroll, screw, centrifugal Explain the difference between a positive-displacement compressor and nonpositive-displacement compressor. Positive displacement - refrigerant is replaced with physical unit like a piston to increase pressure and temperature. Non-positive displacement - the refrigerant is not replaced; it is thrown outward where centrifugal for...

EPA 608 CORE QUESTIONS AND ANSWERS 2023 what is CFCs? Chlorofluorocarbons (Chlorine, Fluorine, and carbon) What is HCFCs? Hydrochlorofluorocarbons (hydrogen, chlorine, fluorine, and carbon) What is ASHRAEs? The American Society of Heating Refrigerating and Airconditioning Engineers. A global professional association seeking to advance heating, ventilation, airconditioning and refrigeration systems. What is the greatest effect in the stratosphere? The greatest effect in ...

Unit 23 Test and Quiz Review Questions and Answers The compressor increases the pressure in the system from the low-side pressure to the high-side pressure. Which of the following best describes the function of a compressor? The compressor restricts the flow of refrigerant that enters the evaporator. The compressor pumps liquid refrigerant into the condenser to transfer heat. The compressor is used to throttle a thermostatic expansion valve (TXV) open or closed. The compressor increases ...

NATE Exam: Core Essentials, questions and answers. Verified d (very important) The ability to utilize all types of communication skills is ____ to the HVACR technician. a. not as important as "hands-on" technical skills b. somewhat important c. unimportant d. very important d (all of the above: clear, complete, concise) It is important to be ____ in filling out service orders so that office staff, other technicians, and customers will know what work you completed on the job. ...

EPA SECTION 608 CORE (2022 revision) What does ozone in the stratosphere above the earth consist of? a. Molecules containing 2 oxygen atoms. b. Molecules containing 3 oxygen atoms. c. Molecules containing 4 oxygen atoms. d. Molecules containing 5 oxygen atoms Which of the following refrigerants has the lowest global warming potential? a. R-134a b. R-407C c. R-410A d. R-600a Which of the following gases is used as the baseline measurement for global warming potential? a. Ammo...

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 off and away from the outdoor coil? - ANSWER-Excessive ice can build up ...

When explaining to a customer that you have topped off the system charge, which of the following terms is most appropriate? - ANSWER-Refrigerant It is important to be _____ in filling out service orders so that office staff, other technicians, and customers will know what work you completed on the job. - ANSWER-All of the above (clear, complete, concise) The ability to utilize all types of communication skills is _____ to the HVACR technician - ANSWER-Very important Listening carefully ...