Carrier HVAC Unit 30GT390

Select the cleaning method used

Corrosive Environment Maintenance

Ensure coil cleaning is part of the planned maintenance schedule

Clean all accumulations of dirt off the coil

Avoid using high-pressure water or air to prevent fin damage

Turn off all power to unit before servicing

Use field disconnect instead of ON-OFF switch on control panel

Verify refrigerant circuit pressure

Is there sufficient pressure to conduct a leak test?

Describe the method used for leak detection if no pressure is present

Repair the leak using good refrigeration practices

Brush gaskets with a light film of compressor oil

Ensure gaskets are not soaked to prevent deterioration

Use new gaskets within 30 minutes to prevent deterioration

Reassemble cooler nozzle end or plain end cover with gaskets

Torque 5/8-in. Diameter Perimeter Bolts (ft-lb)

Record the current oil level in the sight glass

Is the oil level within the acceptable range (1/8 to 3/8 of sight glass)?

Use only Carrier-approved compressor oil for charging

Ensure not to reuse drained oil or use oil exposed to atmosphere

Verify that the oil level is now within the acceptable range after charging, if applicable

Open and tag all electrical disconnects before any work begins.

Ensure the refrigerant is in the condenser by performing the following actions:

Have you ensured that the discharge valve of an operating compressor is not closed?

Close the shutoff valves in the cooler fluid lines, if installed, and remove the cooler fluid piping.

Remove the cooler fluid-side strainer (130-210, 230A-315A, and 330A/B-420A/B only).

Open the air vent at the top of the cooler, and open the drain on the bottom of the cooler to drain it.

Disconnect the conduit and cooler heater wires, if equipped.