Carrier Container Refrigeration Unit 69NT40-511-20

Operate the unit in cooling mode for at least 20 minutes

Check the front oil sight glass for oil foaming after 20 minutes of operation

Is the oil foaming excessively?

Check the refrigerant system for flood-back of liquid refrigerant if oil is foaming excessively

Turn unit off to check the oil level

Check if the oil level is between the bottom to one-eighth level of the sight glass

Remove oil from the compressor if the level is above one-eighth

Add oil to the compressor if the level is below the bottom of the sight glass

Adding Oil with Compressor in System

Turn unit OFF and disconnect power source

Remove upper back panel and bulb clamps securing bulb to unit

Remove two flange screws from recording thermometer and feed capillary and element through the unit

Push replacement bulb end and capillary through the unit

Fill slots with silastic (RTV432, Dow Corning)

Attach bulb clamps tightly to bulb

Connect element flange to recorder ensuring hub of flange faces out to fit into the hole in instrument case

Install inlet air grille and upper panel

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

Prepare an ice-water bath at 0°C (32°F)

Ensure the ohmmeter is calibrated and ready for use

Sensor Placement and Initial Check

Place the sensor in the ice-water bath

Check air temperature/data readout on the control panel

Is the air temperature/data readout 0°C (32°F)?

Handling of Controller/DataCORDER

Ensure all safety precautions are followed

Obtain a grounding wrist strap and a static dissipation mat

Disconnect and secure power to the unit

Place strap on wrist and attach the ground to an unpainted metal area

Carefully remove the Controller/DataCORDER and place it on the static mat

Remove ground strap if servicing the refrigeration unit

Re-install the module into the refrigeration unit after service

Removing and Installing the Controller/DataCORDER Module