AAON H3 Series 450-10,000 (Horizontal Indoor) Packaged Rooftop Yearly Maintenance

At least once each year, a qualified service technician should check out the unit. Supply fans, evaporator coils and air filters should be inspected monthly.

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 should be kept with the unit

Periodically during operation, it is necessary to perform routine service checks on the performance of the unit. This includes checking of the

DX Cooling

Condensate Drain Pans

Gas Heater

WARNING! Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Startup and service must be performed by a Factory Trained Service Technician. A copy of this IOM should be kept wit

WARNING! Disconnect all electrical power sources before servicing the unit. More than one power source may be provided. Failure to do so may result in injury or death from electrical shock or entanglement in moving parts.

CAUTION! If any original wiring needs to be replaced it must be replaced with wiring materials suitable for 105ºC. Label all wires prior to disconnection when servicing unit. Wiring errors can cause improper or dangerous operation. Verify proper operation

Condensate Drainage System Inspection

Furnace Exhaust Vent Termination

Furnace Inspection

Turn off all electrical power to the unit before inspection and servicing.

Check condition and should be determined

Clean

Furnace Operation Check

E-Coated Coil Cleaning

Documented quarterly cleaning of e-coated coils is required to maintain coating warranty coverage. E-Coated Coil Maintenance Record document is available on the AAON website.

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

CAUTION ! High velocity water from a pressure washer or compressed air should only be used at a very low pressure to prevent fin and/or coil damages. The force of the water or air jet may bend the fin edges and increase airside pressure drop. Reduced unit

Quarterly cleaning is essential to extend the life of an e-coated coil and is required to maintain coating warranty coverage.

CAUTION !Harsh chemicals, household bleach, or acid cleaners should not be used to clean outdoor or indoor e-coated coils. These cleaners can be very difficult to rinse out of the coil and can accelerate corrosion and attack the E-coating. If there is dir

Recommended Coil Cleaner – Step 1

GulfCoatTM Coil Cleaner, assuming it is used in accordance with the manufacturer's directions on the container for proper mixing and cleaning, has been approved for use on

Never use any cleaners that are not approved.

Recommended Chloride Remover – Step 2

Warranty Protection – Step 1

Complete the coil cleaning following these steps:

NOTE: Coils should always be cleaned / back flushed, opposite of airflow to prevent impacting the dirt into the coil.

Then, staying in the same vertical area, slowly move back up to the top where you started. Now move over slightly overlapping the area just completed and repeat above. Continue until all coil areas on the inside of the unit have been rinsed.

Warranty Protection – Step 2

Complete the coil chloride (salt) removal following these steps:

Winterizing Coils

Supply Fans

CAUTION ! Blower wheels must be inspected for excessive dust build up periodically and cleaned if required. Excessive dust build up on blower wheels may cause an unbalanced state; leading to vibration and/or component failure. Damages due to excessive dus

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