Aaon Horizontal Indoor Air Handling Units H3 Series

To clean, gain access to the polymer energy recovery wheel, remove the segments, then use the following methods:

• Soak in the solution until grease and tar deposits are loosened (Note: some staining of the desiccant may remain and is not harmful to performance).

• Before removing, rapidly run finger across surface of segment to separate polymer strips for better cleaning action.

• Rinse dirty solution from segment and remove excess water before reinstalling in wheel.

CAUTION: Do not use acid based cleaners, aromatic solvents, steam or temperatures in excess of 170°F; damage to the wheel may occur!;

Routine maintenance of the Energy Recovery

Wheel includes periodic cleaning of the Energy Recovery Wheel as well as inspection of the Air Seals and Wheel Drive Components.

CAUTION: Disconnect electrical power before servicing energy recovery cassette. Always keep hands away from bearing support beam when installing or removing segments. Failure to do so could result in severe injury to fingers or hand.

Cleaning the energy transfer media will help maintain optimal performance. The frequency of cleaning is largely dependent on the application and air quality. Use ASHRAE’s Classes of Air categories, to create a routine cleaning schedule.

Class 1 air has low contaminant concentration with inoffensive odor and sensory irritation intensity.

Class 2 air has moderate contaminant concentration, with mildly offensive odors or sensory-irritation intensity.

Class 3 air has significant contaminant concentration and significant offensive odor or sensory-irritation intensity.

Class 4 air has highly objectionable fumes or gases and potentially contains dangerous particles, bio-aerosols, or gases at a concentration high enough to be considered harmful, not suitable for recirculation or transfer to any other space.

Every 1-2 years Clean Dirty Air:

Is the power to the unit turned on and the thermostat set to call for heat?

Check for proper start-up and ignition as outlined in Start-Up section

Check the appearance of the burner flame

Is the circulating air fan operating?

Verify the proper airflow through furnace

Verify proper flow of condensate from drain system

Is the thermostat or heat controller returned to normal setting?

WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a qualified installer. A copy of this IOM must be kept with the unit.

See Startup section for information on air flow adjustment and refrigerant charge adjustment.

Warning: This procedure requires trained personnel with PPE!

Initial manifold pressure reading

Did the pressure hold at 1.2” w.c for 2 minutes?

Manifold pressure reading after 2 minutes

Did the pressure increase to 3.5” w.c.(10.0”wc for LP gas) within 30 to 45 seconds?

Sign off on the manifold pressure check