Carrier Container Refrigeration Unit 69NT40-511-1

Fill a thermos container with ice cubes or chips

Fill voids between the ice with plain water

Stir the solution until the mixture registers 0 to 0.3°C (32 to 32.5°F) using 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)?

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

For Units equipped with receiver

Connect the gauge manifold to the compressor discharge and suction service valves

Partially block the condenser coil inlet air

Raise compressor discharge pressure to approximately 12 kg/cm@ (175 psig)

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

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 resistance thermometer

Does the temperature differ from 0°C (32°F) by more than 0.6°C (1°F) when compressor cycles off?

Open door and remove chart nut and platen.

Push voltage indicator test switch. Is the voltage indicator in the red or white zone?

Replace battery if voltage indicator points to the red or white zone.

Place recorder bulb in ice bath for 10 minutes.

Rotate the chart by hand and check the stylus indicated temperature.

Is adjustment required for the stylus?