ACR 105

What is the primary function of all metering devices?

• To maintain superheat

  
  

• To provide refrigerant to the evaporator in order to absorb heat

• To prevent floodback

What could be a potential consequence of floodback in a refrigeration system?

• Increased efficiency of the system

• Damage to the compressor

• Improved cooling capacity

Why is it important to maintain superheat in a refrigeration system?

• To ensure the refrigerant is at the correct temperature before it enters the compressor

• To increase the cooling capacity of the system

• To prevent the evaporator from freezing

What are two ways a metering device lowers the temperature of refrigerant as it enters the evaporator?

• Subcooling and de-superheating

• Drop in pressure and increase in superheat

• Drop in pressure and adiabatic expansion

What is the role of the compressor in a refrigeration system?

• To increase the pressure of the refrigerant

• To decrease the temperature of the refrigerant

• To prevent floodback

What could be a potential consequence of having too much superheat in a refrigeration system?

• Increased efficiency of the system

• Damage to the compressor

• Decreased cooling capacity

What is the primary purpose of the cap on a service valve stem?

• To keep the valve stem from being hit accidentally

• To prevent dirt from damaging the packing when the valve is opened

• To prevent refrigerant leaks

What will happen if the compressor is started with the discharge service valve front-seated?

• The valve plate gasket will be damaged or even injure the technician.

• The liquid line will get excessive pressure.

  
  

• The suction reed valves will break.

  
  

What controls the pump-down solenoid?

• Fan switch

• Liquid-line service valve

• Thermostat

What is the primary function of a hot gas bypass valve?

• Maintains a minimum suction pressure at the compressor

• It's quick acting

• It's slow closing