Aaon HVAC Unit RN-013-3-0-KP

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

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

Check for debris or foreign matter in the vent outlet

Remove any debris or foreign matter found

Is the vent outlet screen intact?

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 all necessary cleaning agents and tools are available

Verify the availability of approved cleaning agents

Ensure no harsh chemicals, household bleach, or acid cleaners are present

Verify that the cleaning area is clear of any obstructions

Clean the coil with Enviro-Coil Concentrate

Remove any grease or oil film with the approved cleaning agent