Carrier HVAC Unit 30GT150

Open and tag all electrical disconnects before any work begins.

Ensure cooler is not under pressure before removal.

Open circuit breakers and close discharge valves for lag compressors

Ensure discharge valve of operating compressor is not closed.

Monitor pressure until it reaches approximately 10 to 15 psig (68.8 to 103.2 kPa).

Shut down lead compressor by opening the compressor circuit breaker.

Close the discharge service valve for the lead compressor.

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 to 150 to 170 ft-lb (201 to 228 N-m)

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)?

Add Carrier-approved compressor oil if necessary

Verify that the oil level is now within the acceptable range

Turn off all power to unit before servicing

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

Verify refrigerant circuit pressure

Conduct leak test if pressure is sufficient

Describe the method used for leak detection

Repair the leak using good refrigeration practices