Refrigeration System Flashcard

Front

What are the two broadest categories of special HVACR system components?

Back

Controls and accessories

Front

What is the purpose of an oil pressure safety control?

Back

To prevent compressor damage

Front

What is the set suction pressure for the evaporator pressure regulator for R-134a?

Back

No less than 29.5 psig

Front

What happens to the EEPR valve when the discharge air temperature drops to the valve's set point?

Back

It starts to throttle closed

Front

What happens when the CPR valve is properly adjusted?

Back

The valve will be fully open and the outlet pressure will equal the inlet pressure

Front

What is the role of the screen layer in a helical oil separator?

Back

Acts as an oil stripping and draining medium

Front

What is the primary function of a crankcase heater in a refrigeration system?

Back

To keep the oil in the compressor's crankcase at a temperature higher than the coldest part of the system

Front

What is the role of low-ambient controls in refrigeration systems?

Back

To operate year-round and manage head pressure

Front

What is a common problem with compressor start-ups in cold ambient conditions?

Back

Refrigerant migration

Front

What is a potential issue with compressor start-ups with liquid refrigerant in the crankcase?

Back

Liquid refrigerant floodback