Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN: 9781337399128
Author: Russell E. Smith
Publisher: Cengage Learning
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Chapter 18, Problem 23RQ
To determine
The reason why the unit is heating when it is commanded to cool.
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Students have asked these similar questions
Which of the following is a gas charged accumulator?
a.
spring loaded accumulator
b.
bladder type
c.
all of the mentioned
d.
weighted accumulator
If the compressor and condenser fan motor will not operate but the indoor fan motor is operating, what would be the probable cause of the malfunction?
a. Bad contactor coil
b. Bad thermostat
c. Bad condenser fan motor
d. Bad compressor
The A/C compressor cycles rapidly, and air coming from the vents is only slightly cool. Technician A says the problem could be a low refrigerant charge. Technician B says the problem could be a defective thermostatic switch. Who is right?
Group of answer choices
Technician A
Technician B
Both A and B
Neither A nor B
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Chapter 18 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Which of the following should be turned off while working on the compressor circuit? A. The indoor unit fan B. The unit disconnect C. The thermostat D. The main power supply to the buildingarrow_forwardWhat is the purpose of the internal overload protector in the compressor motor?arrow_forwardWhere are auxiliary limit switches used in heating applications?arrow_forward
- Select which one of the following is a gas charged accumulator? a. all of the mentioned b. bladder type c. weighted accumulator d. spring loaded accumulatorarrow_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_forwardThe compressor motor and condenser fan motor wired series or parallel?arrow_forward
- What would be done to increase the compressor speedon a belt-driven compressor?A. Decrease drive pulley sizeB. Increase drive pulley sizeC. Increase driven pulley sizeD. Both A and Carrow_forwardTechnician A says that when the refrigerant is pumped out of the compressor and sent to the condenser, heat in the refrigerant is moved to the outside air by conduction and convection. Technician B says that the refrigerant leaves the bottom of the condenser as a high-pressure, high-temperature liquid. Who is correct? Technician A only Technician B only Both A and B Neither A nor Barrow_forward8. What would be done to increase the compressor speed on a belt-driven compressor? A. Decrease drive pulley size B. Increase drive pulley size C. Increase driven pulley size 13. What lubricates the refrigeration compressor? A. Refrigerant B. Moisture C. Desiccants D. Oil D. Both A andC 9. Describe the reciprocating compressor piston, rod, crankshaft, valves, valve plate, head, shaft seal, internal motor overload device, pilot-duty motor overload de- vice, and coupling. 10. Name two things in the design of a reciprocating com- pressor that control the efficiency of the compressor. А. 14. What can the service technician do to keep the refrig- eration system operating at peak efficiency? 15. List the main advantage that a discus compressor's valve plate design has over a conventional piston-type В. 11. At what speeds in rpm does a hermetic compressor nor- mally turn? A. 1750 В. 3450 C. 4500 D. Both A and B 12. What effect does a slight amount of liquid refrigerant have on a compressor…arrow_forward
- What is the purpose of the internal overload protector inthe compressor motor?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_forwardvibration absorbers is not true? C. The end of the vibration absorber farthest from B. Vibration absorbers should be installed vertically &Which of the following statements regarding V Vihration absorbers can be placed on either side s. the compressor. whenever possible. the vibration source should be secured. D. Vibration absorbers should be insulated if they are installed in a suction line that is below 32°F (0°C).arrow_forward
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