单项选择题
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
Constant superheat is maintained at the evaporator outl...
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
Hot gas bypass is one of the methods used to （）A.reliev...
单项选择题Hot gas bypass is one of the methods used to （）
A.relieve excessive compressor head pressure B.produce flash gas at the expansion valve C.reduce flooding of the receiver at low load D.defrost the evaporator coils
Thermostatic expansion valves can be adjusted for （）A.s...
单项选择题Thermostatic expansion valves can be adjusted for （）
A.suction pressure only B.head pressure only C.superheat only D.suction pressure and box temperature
