Carrier Container Refrigeration Unit 69NT40-511-5

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 OFF and disconnect power supply

Refer to section 6.27 for removal of the Controller module

Sensor Identification and Measurement

Identify the sensor type to be checked

Measure the ohms resistance using the plug connector marked 'EC'

Refer to Table 6-1 for resistance readings

Checking the Refrigerant Charge

Ensure compliance with environmental laws

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 discharge and suction service valves

Partially block the condenser coil inlet air to raise compressor discharge pressure to approximately 12 kg/cm@ (175 psig)

Is the refrigerant level between the sight glasses?

Ensure no mixing of refrigerants with air for leak testing.

Use R-134a electronic leak detector for finding leaks.

Test joints with soapsuds for large leaks.

Charge the system with refrigerant to build up pressure between 2.1 to 3.5 kg/cm² (30 to 50 psig).

Remove the protective guard from lower section of the unit.

Remove all refrigerant using a refrigerant recovery system.

Locate the compressor junction box and remove wiring.

Disconnect wiring from compressor terminals and remove compressor junction box.

Remove bolts from service valve flanges.

Remove compressor plate mounting bolts.

Remove compressor and mounting plate.

Remove high pressure switch (HPS) from compressor and check operation of switch.