Unit 24 Expansion Devices Flash Cards (CRF)-Mr.Graham

Front

expansion device

Back

The component between the high-pressure liquid line and the evaporator that feeds the liquid refrigerant into the evaporator.

Front

liquid charge bulb

Back

A type of charge in the sensing bulb of the thermostatic expansion valve. This is characteristic of the refrigerant in the system and contains enough liquid so that it will not totally boil away.

Front

external equalizer

Back

The connection from the evaporator outlet to the bottom of the diaphragm on the thermostatic expansion valve.

Front

seat

Back

The stationary part of the valve that the moving part of the valve presses against for shutoff.

Front

vapor charge bulb

Back

A charge in the thermostatic expansion valve bulb that boils to a complete vapor. When this point is reached, an increase in temperature will not produce an increase in pressure.

Front

cross liquid charge bulb

Back

A type of charge in the sensing bulb of the TXV that has different characteristics from the system refrigerant. This is designed to help prevent liquid refrigerant from flooding the compressor at start-up.

Front

cross vapor charge bulb

Back

Similar to the vapor charge bulb but contains a fluid different from the system refrigerant. This is a special-type charge and produces a different temperature/ pressure relationship under different conditions.

Front

microprocessor

Back

A small, preprogrammed, solid-state microcomputer that acts as a main controller.

Front

balanced-port TXV

Back

A valve that will meter refrigerant at the same rate when the condenser head pressure is low.

Front

software

Back

Computer programs written to give specific instructions to computers.