Refrigeration System Quiz

What should the box temperature be when testing the refrigerant charge with an empty trailer?

• 32 F (0 C)

• 0 F (-17.2 C)

• 50 F (10 C)

• 18 F (-7.8 C)

What should the discharge or head pressure gauge read when testing the refrigerant charge with an empty trailer?

• 150 psi (1034 kPa)

• 90-124 kPa

• 275 psi (1896 kPa)

• 18 psi (124 kPa)

What should be used to test the refrigeration system for leaks?

• A thermometer

• A reliable leak detector

• A pressure gauge

• A cardboard piece

When should the compressor oil be checked?

• When the unit is turned off

• When there is evidence of oil loss or components have been removed for service or replacement

• When the refrigerant charge is low

• When the unit is running on high pressure

What should the head pressure be when testing the refrigerant charge with a loaded trailer?

• 18 psi (124 kPa)

• 275 psi (1896 kPa)

• 150 psi (1034 kPa)

• 90-124 kPa

What should be done if the pressure is below the required level when testing the refrigerant charge with a loaded trailer?

• Add more refrigerant

• Cover a portion of the roadside condenser grille with a piece of cardboard to block condenser airflow

• Replace the compressor

• Increase the thermostat setting