MVAC System Components & Operation Flashcards
6 cards from real EPA 609 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 MVAC System Components & Operation flashcards as text
What is the primary function of the compressor in an MVAC system?
Answer: To pressurize refrigerant vapor and circulate it through the system
The compressor pumps and pressurizes refrigerant vapor, raising its temperature before it enters the condenser to release heat.
Where does heat absorption (cooling of the vehicle cabin) occur in an MVAC system?
Answer: Evaporator
The evaporator is located inside the vehicle cabin where liquid refrigerant absorbs heat by evaporating, cooling the air blown over it.
What is the function of the condenser in an MVAC system?
Answer: To release heat from the refrigerant to the outside air
The condenser, located in front of the radiator, releases the heat absorbed from the cabin to the outside air, converting refrigerant vapor back to liquid.
What device in an MVAC system controls the flow of refrigerant into the evaporator?
Answer: Thermal Expansion Valve (TXV) or Orifice Tube
A TXV or orifice tube meters liquid refrigerant into the evaporator, maintaining the correct pressure drop for proper evaporation.
The high-pressure side of an MVAC system runs between which components?
Answer: Compressor outlet to evaporator inlet (through condenser)
The high-pressure side runs from the compressor outlet through the condenser and to the metering device inlet.
What is the purpose of the receiver-drier (or accumulator) in an MVAC system?
Answer: To store liquid refrigerant and remove moisture and contaminants
The receiver-drier stores excess liquid refrigerant and contains desiccant to absorb moisture that could cause acid formation and system damage.