To provide refrigerant to the evaporator.

To prevent liquid floodback.

To absorb heat energy.

To charge the flux capacitor.

AEV.

Capillary tube.

PRV

Solenoid

Prevents floodback and evaporator flooding.

Changes incoming liquid to a spray and lowers its temperature.

Increases the evaporator pressure and superheat.

Increases the evaporator subcooling and decreases evaporator pressure.

Yes, pocket thermometers are very accurate.

No, they are not accurate enough for measuring line temp.

What is a pocket thermometer?

Yes, because they fit nicely in the holes located in refrigerant piping.

When the space temperature is withing 5 degrees of design.

On initial startup of the system.

When the system is satisfied.

The third Sunday after the full moon.

It keeps the temperature of the evaporator up so id doesn't freeze.

It allows the evaporator to operate at its maximum efficiency.

It acts as a margin of safety to prevent compressor damage.

It keeps the compressor lubricated.

Thermostatic Expansion Valve

Electronic Refrigerant Vaporizer

Refrigerant Bypass Valve

Fixed Orifice

Head pressure, suction pressure and valve pressure.

Bulb pressure, evaporator pressure and spring pressure.

Bulb pressure, liquid line pressure and evaporator pressure.

Hot gas pressure, suction pressure and bulb pressure.

Spring pressure

Evaporator pressure

Bulb pressure

Inlet pressure

Adjust the stem all the way in until it stops.

Find the midpoint stem position.

Adjust the stem all the way out until it stops.

Adjust the refrigerant charge.