If you run evaporator blower without running air cond system, sometimes you might get a burst tube in evaporator.

Why? The heat from blower air, evaporating refrigerant in evaporator tubes, and with no where to go (remember air cond compressor is not running), will cause high pressures in tubes.

So be careful that you do not run blower while air cond system is not running.

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Bad example. But you get idea? Pressurized restriction causes spray at other end.

In many refrigeration circuits, small opening is made in form of a thermostatic expansion valve. Many other designs make use of small capillary tubes. In big chillers, orifice plates are common.

All of them achieve same purpose - to expand liquid to become vapor and to cause evaporator tubes to become cold.

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