Aaon HVAC Unit RN-030-3-0-E7

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

Surface Loaded Fibers or Dirt Removal

Remove surface loaded fibers or dirt using one of the following methods

Ensure surface loaded fibers are completely removed prior to water rinse.

Verify water temperature is less than 130°F.

Verify water pressure is less than 900 psig.

Perform a low velocity clean water rinse.

Ensure only clean water is available for cleaning

Is the water pressure set to not exceed 140 psi?

Use pressurized clean water to clean the coils from no closer than 3 inches away

Ensure the water is aimed perpendicular to the coils

Verify nozzle is 6” and 80° to 90° from coil face

Is a cleaning solution mandatory?

Ensure the furnace is turned off before inspection

Verify that the area is well-ventilated

Flue Product Carrying Areas Inspection

Inspect flue product carrying areas for blockages or damage

Are all flue product carrying areas in good condition?

Inspect main burners for wear and tear

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

Ensure the gas supply is turned off before inspection

Ventilate the area to disperse any accumulated gas

Check all connections for leaks

Were any leaks detected during the inspection?

If leaks were detected, were they repaired?