Carrier HVAC Unit 30GT290

Brush gaskets with a light film of compressor oil

Use new gaskets within 30 minutes

Reassemble cooler nozzle end or plain end cover with gaskets

Bolt Installation and Tightening

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

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 additional charge

Do not use oil exposed to atmosphere

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 for leak testing?

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

Repair the leak using good refrigeration practices

Evacuate and dehydrate the system after leak repair

Open and tag all electrical disconnects before any work begins.

Ensure the refrigerant is in the condenser by opening circuit breakers and closing discharge valves for lag compressors.

Ensure discharge valve of operating compressor is not closed.

Close the liquid line service valve for one circuit.

Allow the lead compressor to pump down the circuit until it reaches 10 to 15 psig (68.8 to 103.2 kPa).

Shut down the lead compressor by opening the compressor circuit breaker and quickly close the discharge service valve.

Repeat the procedure for the other circuit.