Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 8, Problem 11RQ
Name the two types of vacuum procedures used by technicians.
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Chapter 8 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 8 - The low-pressure side of the system must not be...Ch. 8 - Name and briefly describe the six classes of...Ch. 8 - The ________is both the greatest asset and the...Ch. 8 - Why should oxygen or compressed air never be used...Ch. 8 - List some of the foreign matter that may enter a...Ch. 8 - True or False: A vacuum pump can remove any type...Ch. 8 - Air in a refrigeration system causes which of the...Ch. 8 - The only two products that should be circulating...Ch. 8 - In order to remove moisture from a refrigeration...Ch. 8 - Are the best vacuum pumps one-stage or two-stage?
Ch. 8 - Name the two types of vacuum procedures used by...Ch. 8 - What can be done to get water out from under the...Ch. 8 - When evacuating a refrigeration system that has...Ch. 8 - What is today's most accurate type of deep vacuum...Ch. 8 - _________microns are in 1 inch.Ch. 8 - Briefly describe the method for cleaning up a...Ch. 8 - What is the advantage of using large gauge lines...Ch. 8 - Why is it important to change the oil on a vacuum...Ch. 8 - Describe the meaning of a deep vacuum, and explain...Ch. 8 - List the main advantages of a microfoam leak...Ch. 8 - What could an oily dust spot on a condenser or...Ch. 8 - Why should a condenser be covered with a sheet...Ch. 8 - Leaks that occur only when the unit is in...Ch. 8 - Briefly describe a combination-dependent leak.
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- Describe the meaning of a deep vacuum, and explain why it is important to reach and hold a deep vacuum when pulling a vacuum on a system.arrow_forwardWhat is today's most accurate type of deep vacuum gauge?arrow_forward1.A technician is traversing a duct and obtains the following 8 velocity readings: 500 fpm, 400 fpm, 375 fpm, 625 fpm, 275 fpm,360 fpm,420 fpm, and 575 fpm. What is the velocity value that will be used for system calculations?arrow_forward
- 2. Two sections must be discussed: 2.1. Talking about the material from which the air conditioner compressor is made with a presentation of the properties of the material 2.2. Preparing the executive drawing of the air conditioner compressor (job shop drawing) and it should include (dimensional and geometrical tolerances)arrow_forwardAre the best vacuum pumps one-stage or two-stage?arrow_forwardList any four factors that are to be considered in selection of storage tanks in Oil and Gas?arrow_forward
- There are many ways to clean parts while they arebeing serviced. These methods can be groupedinto three separate categories. What are they?arrow_forwardWhich of the following can be the vacuum pressure? a. Pressure above atmospheric pressure b. Pressure above gauge pressure c. Pressure below atmospheric pressure d. The pressure equal to gauge pressurearrow_forwardIndustrial Pipes: Because it does not have a way to access the entire internal part of a pipe, this type of equipment is said to have no internal inspection, because it is not possible to inspect all regions within it, although inspections in places close to opening or disconnection points are possible?arrow_forward
- 2.A. You can usually check for a leak in a vacuum system by looking at or feelingA. at the exhaust of the vacuum pump.B. at the vacuum gauge at the vacuum pump.C. for signs of dirt on the piping. 2.B. When you measure the voltage drop across a set of contacts, you'reA. checking the quality of the contact set.B. sensing how much current is flowing in the circuit.C. measuring the equivalent motor resistance. 2.C. A chain-drive system can be aligned easier than a belt-drive system since the chain-drive systemA. can have a string left on the sprockets after the alignment is complete.B. can have the chain removed while the final alignment is taking place.C. is less critical to misalignment.arrow_forwardExplain how vacuum is used to provide a power assist.arrow_forwardCompressed air can be used to clean the machine, is a general safety precaution while working in a workshop. Select one: True O Falsearrow_forward
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