Aaon HVAC Unit RN-015-3-0-EA

Is the fan at normal operating temperature?

Select the grease used for lubrication

Add grease to purge the seals (grams)

Was the lubrication process completed without over-lubricating?

Temperature and Pressure Measurement

Measure the temperature of the suction line close to the compressor

Read gauge pressure at the suction line close to the compressor

Temperature Conversion and Calculation

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

Subtract the saturated temperature from the measured suction line temperature to determine the evaporator superheat

Compare calculated superheat to the table below for the appropriate unit type and options

Ensure only clean water is available for cleaning

Is the water pressure set to not exceed 140 psi?

Position nozzle 6 inches from coil face at an angle of 80° to 90°

Ensure water is aimed perpendicular to the coils from no closer than 3 inches

Is the cleaning solution pH between 5 and 9, if used?

Check for any visible coil damage

Inspect the wire screen for debris or foreign matter

Is the wire screen free of debris?

Remove any debris or foreign matter from the wire screen

Was the debris successfully removed?

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.

Was it necessary to remove some of the control door jambs?