Aaon HVAC Unit RN-060-3-0-C2

Has the need for cleaning been confirmed by a qualified service agency?

Was consultation with an AAON Service representative completed?

Ensure cleaning is performed by a qualified service agency.

Describe any issues identified during cleaning.

Is the unit operating correctly after cleaning?

Is the fan at normal operating temperature?

Select the grease used for lubrication

Was the lubrication process completed without over-lubricating?

Measure the temperature of the liquid line as it leaves the condenser coil

Read the gauge pressure at the liquid line close to the point where the temperature was taken

Convert the pressure obtained to a saturated temperature using the appropriate refrigerant temperature-pressure chart

Subtract the measured liquid line temperature from the saturated temperature to determine the liquid sub-cooling

Compare calculated sub-cooling to the table below for the appropriate unit type and options

Measure the current sub-cooling temperature

Measure the current superheat temperature

Is the system overcharged or undercharged?

Is the sub-cooling temperature too high and evaporator fully loaded?

Reduce the amount of refrigerant in the system to lower the sub-cooling

Shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts.

Check the gas pipe in the unit for leaks before startup.

Disconnect all wiring on the heat exchanger.

Disconnect flex gas lines and pull out of the way.

Remove screws around the perimeter of the heat exchanger face plate that connect it to the unit. Only the outermost screws should be removed.

Pull the heat exchanger straight back and out of the unit. Remove control door jambs if necessary.

Reinstallation of Heat Exchanger