Exam 25: Special Refrigeration System Components

What are the two forces that control the EPR valve?

Technician "A" says that a multi-evaporator system equipped with three evaporators (one high temperature, one medium temperature, and one low temperature) will use one evaporator pressure regulator and two flow check valves. Technician "B" says that the crankcase pressure regulator is used to keep the low-temperature compressor from overloading on a hot pulldown. Which of the following statements is correct?

Frequently on smaller condensing units, one fan will run continuously and the other fan will be cycled on and off with a(n) ____.

What is a check valve?

To protect the compressor during periods of hot pull down, a(n) ____ valve is used.

Automatic pumpdown systems are equipped with a(n) ____________________ to prevent refrigerant from reaching the evaporator .

Two-temperature operation is desirable when more than one evaporator is used with a compressor .

Where is the refrigerant sight glass normally located?

The refrigeration compressor motor can be operated at about ____% over its rated capacity without harm during the pulldown .

The ____________________ is a mechanical control that keeps the refrigerant pressure in the evaporator from going below a predetermined point.

Two types of relief valves are the spring-loaded valve and the ____________________ valve .

The one-time relief valve is caused to relieve by ____________________.

____ are snap-acting valves that open and close very fast when the electrical energy is applied to the coil .

EPR valves are also referred to as ____ valves.

Helical oil separators are about 58% efficient in separating oil.