What is subcooling?
A) Lowering refrigerant temperature by flashing some of it off to a gas, cooling the remaining liquid
B) Lowering liquid refrigerant temperature below its saturation temperature
C) Lowering refrigerant temperature below freezing
D) Lowering refrigerant temperature below 0°F
B
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How does a coil sensing tstat prevent frost on a medium temperature evaporator?
a. It has a narrow temperature swing to prevent frost buildup. b. It has a wide temperature swing to allow time to defrost. c. The tstat won’t start the compressor until the evaporator frost has melted. d. The tstat knows when to go into defrost.
The ____ circuit electrical floor plan shows electrical outlets and devices and includes duplex outlets, specialty outlets, telephone, fire alarm, etc.
A. solid B. power C. riser D. schematic
How far apart should hangers for metal duct be placed?
What will be an ideal response?
This geometric tolerance allows a specified amount of surface variation from a flat plane.
a. straightness b. flatness c. profile d. parallelism