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 14, Problem 19RQ
Why is a line-voltage thermostat mounted on an electrical box that has conduit connected to it?
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Why is a low-voltage thermostat normally more accuratethan a high-voltage thermostat?
Question1. If an air conditioning system has three independent zones, how many space thermostats will the system have?
Question 2. A technician is traversing a duct and obtains the following 8 velocity: 500fpm, 400fpm, 375fpm,625fpm,275fpm,360fpm,450fpm,and 575fpm. What is the velocity value that can be used for the system calculations?
What is the basis for the thermostat resetting?
Chapter 14 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 14 - Why is a low-voltage thermostat normally more...Ch. 14 - The three kinds of switching mechanism used in...Ch. 14 - Prob. 3RQCh. 14 - What does a cold anticipator do?Ch. 14 - Define system overshoot when dealing with...Ch. 14 - Prob. 6RQCh. 14 - Prob. 7RQCh. 14 - Describe the method a service technician should...Ch. 14 - Explain how microelectromc or electrontc...Ch. 14 - Prob. 10RQ
Ch. 14 - What component steps down the voltage to the...Ch. 14 - Low voltage is desirable for residential control...Ch. 14 - What is the maximum amperage usually encountered...Ch. 14 - Prob. 14RQCh. 14 - Prob. 15RQCh. 14 - What two types of switches are normally found in...Ch. 14 - Prob. 17RQCh. 14 - Prob. 18RQCh. 14 - Why is a line-voltage thermostat mounted on an...Ch. 14 - What is the principle of operation for most...Ch. 14 - Describe a method for speedmg up the cooling of an...Ch. 14 - Describe two methods for cooling an overheated...Ch. 14 - How can an electronic thermometer be used in a...Ch. 14 - A temperature-sensing device used in measuring...Ch. 14 - How does a thermocouple change with a temperature...Ch. 14 - True or False: Pressures below atmospheric...Ch. 14 - Name one function of the low-pressure control.Ch. 14 - Which is true of a high-pressure control? A. It...Ch. 14 - Name two types of water pressure control.Ch. 14 - Why should a safety control not be adjusted if it...Ch. 14 - Prob. 31RQCh. 14 - True or False: A change in the differential...Ch. 14 - True or False: A change in the differential of a...Ch. 14 - Prob. 34RQCh. 14 - Explain what is meant by the range of a...
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- Three common controls used in central electric heat applications are thermostats, contactors (or relays), and A. capacitors. B. sequencers. C. cool anticipators.arrow_forwardWhat two factors determine the amount of voltage produced by a thermocouple?arrow_forwardWhat two factors initiate the defrostmode in the diagram?arrow_forward
- when must a thermostat be fully opened?arrow_forwardIdentify the various elements that might be present in a control system involving a thermostatically controlled electric heater.arrow_forwardA disadvantage of a central forced-air electric furnace is that A. there is no zone control for individual rooms. B. a thermostat must be installed in each room. C. only line-voltage thermostats can be used. D. it is difficult to add air-conditioning (cooling)arrow_forward
- What advantage does a thermostatic expansion valve have over a capillary tube?arrow_forwardDescribe 3 best practices when installing a thermostat and how they relate?arrow_forwardWhat is the primary purpose of a thermostat jiggle valve? Select one: a. To act as a bypass for coolant b. To relieve water pump pressure under load c. To ensure coolant flows the correct direction d. To aid in bleeding air from the systemarrow_forward
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