单项选择题
In an operating refrigeration system low on refrigerant, a liquid line sight glass will（）
A.be clear
B.be blue
C.be light green
D.show bubbles
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相关考题
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单项选择题
The thermal expansion valve reacts directly to the （）
A.temperature in the space being cooled
B.liquid refrigerant pressure at the solenoid valve
C.pressure drop across the evaporator coils
D.refrigerant gas superheat at the coil outlet -
单项选择题
One function of the thermal expansion valve is to（）
A.act as a pilot from the solenoid valve
B.regulate the amount of refrigerant flow to the coil
C.regulate the water flow
D.turn the compressor off and on -
单项选择题
Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）
A.solenoid valve
B.low pressure cutout switch
C.king valve
D.thermal expansion valve
