Carrier Container Refrigeration Unit 69NT40-511-6

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 excess capillary tube is secured to the power head assembly and wrapped with 'Presstite'.

Ensure thermal bulb is tightly secured to the suction line and wrapped with 'Presstite'.

Pump down the unit per section 6.3.

Remove insulation (Presstite) from expansion valve bulb and power assembly and then remove thermal bulb from the suction line.

Loosen flare nut and disconnect equalizing line from expansion valve.

Remove capscrews and lift off power assembly and remove cage assembly.

Check for foreign material in valve body.

Turn power OFF and remove power plug

Remove screws securing the panel covering the evaporator section (upper panel)

Disconnect the defrost heater wiring

Disconnect the sensor from the coil

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

Is the temperature stabilized at 0°C (32°F) as verified by the resistance thermometer?

Enter the temperature indicated by the thermometer when the compressor cycles off

Does the thermometer reading differ from 0°C (32°F) by more than 0.6°C (1°F)?

Checking the Refrigerant Charge

Set the controller set point to -25°C (-13°F)

Ensure the suction modulation valve is fully open

Connect the gauge manifold to the compressor service valves

Enter the compressor discharge pressure

Is the refrigerant level within the sight glass boundaries?

Adding Refrigerant to System (Full Charge)

Evacuate unit and leave in deep vacuum