Carrier Container Refrigeration Unit 69NT40-511-2

Disconnect leads by unplugging the connector.

Remove snap cap or locknut and lift off coil.

Verify coil type, voltage and frequency of old and new coil.

Replacing Valve Internal Parts -- Alco

Remove enclosing tube collar using installation/removal tool.

Check plunger for restriction due to:

WARNING: Never mix refrigerants with air for leak testing.

Use R-134a electronic leak detector to find leaks.

Test joints with soapsuds for large leaks.

System Charging and Leak Checking

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

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.

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.

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 ohmmeter or continuity light across switch terminals

Connect hose to a cylinder of dry nitrogen

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