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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Chapter 30, Problem 6RQ
To determine
The correct reason for low voltage thermostat that is used to control an electric heating system.
Expert Solution & Answer
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2. Design a thermostat
Electrical shorts are commonly caused by
Select one:
a. Wire movement
b. heat melting the insulation
c. Accident
d. all
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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- Why is a low-voltage thermostat normally more accurate than a high-voltage thermostat?arrow_forwardWhat type of chemical is used to cause a pressure change in a bellows type thermostat?arrow_forwardto 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_forward
- Technician A says that installing a thermostat incorrectly can cause the housing to break. Technician B says that it is OK to install a thermostat in either direction. Who is correct? Select one: a. Technician A only b. Technician B only C. Both A and B d. Neither A nor Barrow_forwardAn overheating vehicle is being discussed. Technician A states that the thermostat is open until the engine fully warms up. Technician B states that the vehicle may be overheating because the thermostat is stuck closed. Who is correct? Select one: a. Technician A only b. Technician B only c. Both Technicians A and B d. Neither Technician A nor Barrow_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
- The hot circuit in the thermostat is the _______terminal.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_forwardWhat is the maximum amperage usually encountered by a low-voltage thermostat?arrow_forward
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