unit 2 vocabulary

desiccant

a chemical agent used to absorb moisture from refrigerant in air conditioning systems. it's located in the receiver-drier or accumulator

clutch

a coupling device that connects the compressor drive pulley to the compressor drive shaft

drier

a device containing desiccant. a canister that serves multiple functions

compressor cutout switch

a device that disengages the compressor clutch on the basis of low charge, high charge, or temperature within the air conditioning systems

evaporator temperature regulator

a device that regulates evaporator outlet volume on the basis of outlet temperature. the regulator prevents evaporator carryover

thermal expansion valve

a device that regulates the refrigerant flow into the evaporator inlet on the basis of temperature and pressure

evaporator

a heat exchange device that takes heat from the passenger compartment and transports it to the condenser

condenser

a heat exchange device used to transfer heat from inside the air conditioning system to the outside air

equalizer line

a line used to transfer sensor pressure from one side of the thermal expansion valve to some other point on the valve.

compressor

a pump that circulates the refrigerant through the air conditioning systems. it also raises the pressure and temperature of the refrigerant

refrigerant oil

a special oil that lubricates air conditioning parts and eliminates contaminants and tars from refrigerants

clutch cycling switch

a switch that engages or disengages the compressor clutch in relation to evaporator pressure or temperature

pressure cycling switch

a switch that turns the compressor in and off in cycling clutch systems

capillary tube

a tube that connects the remote temperature sensing bulb with a thermal expansion valve or thermostatic switch

orifice tube ( fixed orifice tube)

a tube with a metered passage through the center. the orifice tube is located between the condenser and the evaporator in the high-pressure line

evaporator pressure regulator ( EPR)

a valve that regulates pressure in the evaporator. located in the evaporator outlet to prevent liquid refrigerant carryover

ram air

air that enters the ole um chamber or flows across the radiator or condenser as the vehicle moves down the road

thermostatic expansion valve system

an air conditioning system that uses a receiver-drier and thermal expansion valve instead of an accumulator and orifice tube

cycling clutch system

an air conditioning system that uses an accumulator and an orifice tube instead of a receiver-drier and thermal expansion valve

magnetic clutch

an electromagnetic device used to couple the drive belt to the compressor shaft

thermostatic cycling switch

cycles the compressor clutch according to evaporator temperature

accumulator

device found on cycling clutch air conditioning systems that filters moisture from the refrigerant and stores excess refrigerant

receiver-drier

device found on thermostatic expansion valve air conditioning systems that filters moisture from the refrigerant and stores excess refrigerant

compressor discharge switch

device that disengages the compressor clutch when the refrigerant pressure becomes too low

oil bleed

line it passage that ensures a continuous oil vapor supply to the compressor. the line starts prior to the EPR or thermal expansion valve

head pressure

the discharge pressure at the compressor

high side

the section of the air conditioning system between the compressor outlet and the thermal expansion valve or orifice tube

low side

the section of the air conditioning system that runs from the evaporator to the compressor inlet