Carrier Container Refrigeration Unit 69NT40-511-11

Ensure a pressure regulator is used with the nitrogen cylinder

Ensure no oxygen is present near the refrigeration system

Remove the high pressure switch as outlined in section 6.12.1

Connect ohmmeter or continuity light across switch terminals

Connect hose to a cylinder of dry nitrogen

Cut wires to 25.4 cm (10 inches) from the back of the mounting stud of the defective sensor and discard.

Cut one of the two wires 25.4 mm (1.0 inch) shorter than the other wire.

Cut one replacement sensor wire back 25.4 mm (1.0 inch).

Strip back insulation on all wiring 6.35mm (1/4 inch).

Fill thermos container with ice cubes or chips

Fill voids between ice with plain water

Stir the solution until it registers 0 to 0.3°C (32 to 32.5°F) on a laboratory thermometer

Check Resistance Thermometer Accuracy

Immerse the resistance thermometer in the 0°C (32°F) solution

Is the recommended length of the check probe immersed?

Does the resistance thermometer register 0°C (32°F)?

Refer to section 6.27 for removal of the Controller module

Identify the plug connector marked 'EC' connected to the Controller module

Locate the wires marked AMBS or DTS

Measure the ohms resistance using the pins of the plug

Record the ohms resistance readings

Operate the unit in cooling mode for at least 20 minutes

Is there any foaming of the oil in the front oil sight glass after 20 minutes of operation?

Turn unit off to check the oil level

Is the oil level between the bottom to one-eighth level of the sight glass?

Select the action based on oil level

Adding Oil with Compressor in System