单项选择题
A.high-pressure cutout switch is jammed open B.low-pressure switch is jammed shut C.thermal bulb is not operating properly D.scale trap is clogged
The bulb for the thermal expansion valve is located（）A....
单项选择题The bulb for the thermal expansion valve is located（）
A.in the middle of evaporator coils B.near the evaporator coil outlet C.near the evaporator coil inlet D.on the bottom row of evaporator coils
The thermal expansion valve responds to the（）A.amount o...
单项选择题The thermal expansion valve responds to the（）
A.amount of superheat in the vapor leaving the coil B.amount of superheat in the liquid C.temperature in the evaporator coils D.pressure in the evaporator coils
The thermostatic valve has a throttling action, that is...
单项选择题The thermostatic valve has a throttling action, that is to say the valve can（）
A.stop the refrigerant from flowing B.force the refrigerant to flow C.cause the refrigerant pressure to rise D.cause the refrigerant pressure to fall
