Aaon HVAC Unit RN-008-1-0-CB

Set unit controls to cooling mode of operation with supply fans on

Is the fan operating in the correct direction?

Is the compressor operating correctly?

Is the compressor rotating correctly?

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

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

Verify that the water pressure does not exceed 140 psi

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

Aim water perpendicular to the coils from no closer than 3 inches

Ensure no detergents or coil cleaners are used

If using a cleaning solution, confirm it has a pH between 5 and 9 and does not contain chlorides, sulfates, copper, iron, nickel, or titanium

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

Filter Inspection and Replacement

Open access door and pull filters straight out to inspect all of the filters

Replace filters with the size indicated on each filter or as shown in the tables

Ensure the arrow on the replacement filters points towards the blower

Verify the following components are in place

Check for debris or foreign matter in the vent outlet

Is the vent outlet clear of debris?

Clean the vent outlet if debris is found

Was the vent outlet cleaned successfully?

Check vent outlet each time air filters are changed