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 30, Problem 4RQ
A 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)
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Why is a low-voltage thermostat normally more accuratethan a high-voltage thermostat?
Explain the layout and the basic operation of a centralized air conditioning system
(or chiller system).
If the thermostat contacts are closed the compressor and the condenser fan motor are not operating, and all the other loads are operating properly, which might be the problem?
A. A bad high pressure safety switch.
B. A bad low pressure switch
C. Both A. and B.
D. A bad thermostat
Chapter 30 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 30 - The material often used to manufacture electric...Ch. 30 - Portable or small space heaters with glowing coils...Ch. 30 - Baseboard heaters transfer heat by______.Ch. 30 - A disadvantage of a central forced-air electric...Ch. 30 - Three common controls used in central electric...Ch. 30 - Prob. 6RQCh. 30 - Prob. 7RQCh. 30 - Prob. 8RQCh. 30 - True or False: A package sequencer can start or...Ch. 30 - Two types of wiring diagrams are the pictorial and...
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- to run d. both a and b 44. Ifa thermostatic expansion valve's thermal bulb came loose from the suction line at the outlet of the evaporator, whích of the following could result? The bulb pressure would increase and the c. thermostatic expansion valve would open. b. The superheat in the evaporator would decrease. a. Liquid refrigerant would flow back to the compressor. d. All of the above are correct. 45. If the thermal bulb assembly develops a leak, what will occur? All of the system's refrigerant will leak a. The valve will open to allow more c. refrigerant to flow. d. It will have no effect on system operation. out. b. The bulb pressure will reduce and the valve will close. 46. The purpose of an externally equalized thermostatic expansion valve is to compensate for excessive evaporator pressure drop b. allow system to equalize faster a. prevent the expansion valve from frosting up d. c. allow refrigerant to expand in the compressor 47. The primary function of an expansion device is…arrow_forwardWhat is the total length of this furnace and air-conditioning system?arrow_forward2. Design a thermostatarrow_forward
- How is defrost accomplished when the equipment room is in the back and the medium-temperature fixtures are in the front?arrow_forwardDescribe the method a service technician should follow when measuring the current that normally travels through a heating anticipator.arrow_forwardDescribe how a modulating furnace operates.arrow_forward
- What 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_forwardCompare and contrast the control system for a domestic central heating system involving a bimetallic thermostat and that involving a microprocessor.arrow_forwardSelect the most accurate system from the following, O a. Lamp with on/off switch O b. Room heating system O c. Traffic light O d. Air conditionerarrow_forward
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