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 25, Problem 9RQ
Which is not a method of low-ambient control on air-cooled equipment?
A. Modulating TXV
B. Fan-cycling controls
C. Flooding a condenser
D. Fan speed control
Describe the devices in questions 10-13.
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Chapter 25 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 25 - Which is not a basic component of the compression...Ch. 25 - Describe modulating fluid flow.Ch. 25 - The purpose of the crankcase pressure-regulating...Ch. 25 - Describe the function of an electric evaporator...Ch. 25 - Prob. 5RQCh. 25 - Briefly describe the function of a...Ch. 25 - Two types of relief valves are_______and ______.Ch. 25 - Why is low-ambient control necessary?Ch. 25 - Which is not a method of low-ambient control on...Ch. 25 - Low-pressure switch
Ch. 25 - High-pressure switchCh. 25 - Low-ambient(switch)Ch. 25 - Oil safety switchCh. 25 - What is the function of the current sensing relay...Ch. 25 - Why is there a time delay in an oil safety...Ch. 25 - What is off-cycle defrost?Ch. 25 - Two types of off-cycle defrost are______and...Ch. 25 - Two methods for accomplishing defrost on...Ch. 25 - Filter drierCh. 25 - Heat exchangerCh. 25 - Suction accumulatorCh. 25 - ReceiverCh. 25 - Prob. 23RQCh. 25 - Prob. 24RQCh. 25 - What will happen if the float in an oil separator...Ch. 25 - The function of the evaporator pressure regulator...Ch. 25 - What is the function of the oil return hole or...Ch. 25 - What is the function of the pressure equalization...
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- Induced-draft condensers are typically used with units that have _____defrost. A. automatic B. manualarrow_forwardName two problems a refrigeration system may have if the condensing unit is exposed to a low-ambient condition when not equipped with a low-ambient head pressure control valve.arrow_forwardWhat kind of material is used in the waterless ground loop in a waterless, earth-coupled, closed-loop geothermal heat pump system?arrow_forward
- 8. 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_forwardDescribe four ways in which the heater control valve may be controlledarrow_forwardIf a hot water reheat coil is installed with a two way modulating valve. A. The VAV box can only be used for a heating-only application . B. A variable volume circulating pump must be used. C. A constant volume circulating pump can be used. D. The VAV box can only be used for a cooling-only applicationarrow_forward
- Explain how liquid floodback to the compressor may occur during an ice maker hot gas defrost period.arrow_forwardThe adjustment device used for low atmospheric pressure conditions is called the _____ thermostatic adjustment control. A. positive temperature coefficient B. altitude C. dual-voltage D. condenser coilarrow_forwardThe indoor coil is called a condenser during the______season.arrow_forward
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