Evaporator feed control, Objective 2

What is the main purpose of an evaporator feed controller?

• To reduce the temperature on the evaporating side of the system

• To control the speed of the compressor

• To increase the pressure on the condensing side of the system

• To manage the rate of refrigerant flow into the evaporator

Which of the following is NOT a type of evaporator feed control?

• Capillary Tube

• Float

• Expansion Valve

• Fixed Orifice

What is the purpose of a fixed orifice evaporator feed control?

• To drastically reduce the pressure and flow of liquid refrigerant

• To increase the pressure on the evaporating side of the system

• To regulate the temperature in the condenser

• To control the speed of the compressor

What is the function of a capillary tube evaporator feed control?

• To regulate the temperature in the evaporator

• To increase the pressure on the condensing side of the system

• To reduce the pressure of liquid refrigerant as it passes through

• To control the speed of the compressor

How does a float type evaporator feed control operate?

• By regulating the temperature in the evaporator

• By controlling the liquid refrigerant level in the receiver or evaporator

• By increasing the pressure on the condensing side of the system

• By controlling the speed of the compressor

What is the purpose of an expansion valve in refrigeration systems?

• To start and stop refrigerant flow

• To control the speed of the compressor

• To increase the pressure on the evaporating side of the system

• To regulate the temperature in the condenser

What is the main difference between a hand expansion valve and an automatic expansion valve?

• Hand valve increases pressure while automatic valve decreases pressure

• Hand valve is used in large chillers while automatic valve is used in small systems

• Hand valve is fixed while automatic valve is adjustable

• Hand valve is manually controlled while automatic valve is automatic

What is the function of a thermostatic expansion valve?

• To increase the pressure on the condensing side of the system

• To control the speed of the compressor

• To maintain a constant superheat leaving the evaporator

• To regulate the temperature in the evaporator

What is the purpose of superheat in a refrigeration system?

• To control the speed of the compressor

• To regulate the temperature in the condenser

• To prevent compressors from pumping liquid refrigerant

• To increase the pressure on the evaporating side of the system

What is the acceptable superheat range for low temperature applications?

• 4°F to 6°F

• 8°F to 10°F

• 15°F to 20°F

• 6°F to 8°F