Carrier Container Refrigeration Unit 69NT40-511-4

Select the method for temperature stabilization

Set the unit's set point to 0°C (32°F)

Allow the unit to pull down to 0°C (32°F)

Enter the number of compressor ON-OFF cycles observed

Enter the temperature indicated by the thermometer when compressor cycles off

Is the temperature difference more than 0.6°C (1°F)?

Turn unit power OFF and disconnect power supply.

Remove and save any cover over wiring and probe holder, if present.

Cut cable 5 cm (2 inches) from shoulder of defective sensor and discard the defective probe only.

Save cap and grommet assembly for reuse on the replacement probe.

Cut one wire of existing cable 41 mm (1-5/8 inches) shorter than the other wire.

Cut one replacement sensor wire (opposite color) back 41 mm (1-5/8 inches).

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 testing device across switch terminals

Is the switch closed after relieving compressor pressure?

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).

Turn unit start-stop switch OFF

Frontseat both suction and discharge service valves to isolate compressor

Remove the refrigerant from the compressor

Disconnect wiring from defective switch

Remove the high pressure switch by turning counterclockwise

Verify switch settings before installation