Air Conditioning Flashcards
What happens to the boiling point of a liquid when pressure is increased
Boiling point increases
What refrigerant is now used
134a
What gas is released when refrigerant is burned
Phosgene
What color tank is for R-12 refrigerant
White
What color tank is for R-134a refrigerant
Blue
What does the receiver/dryer do
-Separates liquid from gas
- removes moisture and dirt
What state is the refrigerant entering and exiting the receiver/dryer
Gas in
liquid out
What do foam or bubbles on the receiver sight glass indicate
Low refrigerant level
What does the expansion valve do
Meters high pressure liquid to the evaporator
What does the evaporator do
-Absorbs heat from the cabin
- dehumidifies air
What temp must the evaporator be kept above
32 F
What is the flow of refrigerant through the system
-high pressure gas leaves the compressor
- high pressure liquid from the condenser
- high pressure liquid from the receiver
- low pressure liquid from expansion valve
Low pressure gas from evaporator
What part of the AC system changes cabin air temp
Evaporator
What does the compressor in and AC system do
Increases vaporized refrigerant pressure
What does the condenser in an AC system do
-removes heat from compressed refrigerant
- returns gas to liquid
