Aaon HVAC Unit RN-020-3-0-FK

Ensure only clean water is used for cleaning

Verify water pressure does not exceed 140 psi

Ensure nozzle distance is no closer than 3 inches from the coils

Check nozzle angle from coil face

Aim water perpendicular to the coils

Is a cleaning solution mandatory?

If cleaning solution is mandatory

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

Remove surface loaded fibers or dirt

Ensure surface loaded fibers are completely removed prior to using low velocity clean water rinse.

Verify water temperature is less than 130°F before rinsing.

Verify water pressure is less than 900 psig before rinsing.

Perform a monthly clean water rinse for coils in coastal or industrial environments.

Ensure the furnace is turned off and cooled down

Verify that the gas supply is shut off

Flue Product Carrying Areas Inspection

Inspect flue product carrying areas for blockages or damage

Are all flue connections secure and leak-free?

Check main burners for cleanliness and proper alignment

Temperature and Pressure Measurement

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

Pressure Conversion and Calculation

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 for the appropriate unit type and options

Check for debris or foreign matter in the vent outlet

Is the vent outlet clear of debris?

Was any cleaning required during this inspection?