The purpose of the refrigeration system low pressure cutout

Low compressor head pressure in a refrigeration system can be caused by ___.

A.insufficient condenser cooling water

B.excessive condenser cooling water

C.air in the refrigeration system

D.excessive refrigerant in the system

The sensing line for the low pressure cutout switch to a refrigeration system is located ______.

A.in the chill box(冰箱)

B.before the receiver

C.on the suction side of the compressor

D.on the discharge side of the compressor

If a refrigeration compressor is short cycling on high head pressure, you should

A.purge the condenser if the waterside is dirty

B.check for proper water flow through the condenser

C.increase the high pressure cutout setting

D.reduce the cooling water flow

Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?

A.A shortage of liquid refrigerant.

B.Excessive frost on the evaporator.

C.Excessive condenser cooling water.

D.Insufficient condenser cooling water flow.

The refrigeration system low pressure cutout switch is actuated by______.

A.an electric system manager

B.a sensing bulb at the tail coil of the evaporator

C.pressure changes in the suction line

D.failure of the king solenoid valve

When adding oil to a refrigeration system, precautions must be taken to ensure that

A.the compressor suction pressure is not too high

B.all air is purged from the pump and charging fittings

C.the high pressure cutout switch is held open to prevent accidental starting

D.the condenser is completely shutdown first