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AAON M3 Series Indoor Air Handlers Unit Yearly Maintenance

The AAON M3 Series Indoor Air Handlers Unit Yearly Maintenance is a standard procedure that checks the operation quality of the machines components. Maintain the quality of you Air Handler by following this procedure.

MaintainX

04/26/2021

AAON M3 Series Indoor Air Handlers Unit Yearly Maintenance

Check operation of heating and cooling sequences.

Check for correct damper operation.

Check fans for wear. Clean if necessary. Refer to motor manufacturer IOM for re lubrication schedule.

Winterize coils if necessary.

Inspect and if necessary clean unit interior.

Clean coils, drain pan and drain line.

Check electrical connections for tightness.

Check piping and valves for correct operation.

Blower Assembly

The M3 Series air handling unit uses only direct drive fans.

The only bearings that will need to be lubricated are the ones contained in the motor.

Refer to the motor manufacturer maintenance manual for the correct re-lubrication schedule and lubricant information.

It is important that fans be kept clean to maintain efficiency and reduce stress on the unit

To clean the fans first make sure the power to the unit is turned off. Secure the fan so it cannot free-wheel.

Clean dust and debris on the fan.

Check set screws for tightness.

Rotate the fan by hand and check for noise and roughness. The fan should rotate smoothly.

Coils/Drain Pans

Coils must be kept clean to maintain peak unit efficiency and capacity.

Clean filters will help prevent dirty coils; however, coils should still be cleaned at least annually by an HVAC professional.

The coils should be cleaned using lowpressure water, low-pressure air, or a noncorrosive coil cleaner.

Take care not to damage fins while cleaning. High pressure water can damage fins.

Condensate drain pans should be inspected often and cleaned at least annually to maintain proper drainage and prevent the spread of disease.

Cooling coils are raised off the drain pan to facilitate cleaning.

The drain and p-traps should also be checked to prevent clogging. A clogged drain will result in water backing up in the drain pan and potentially damaging the unit and the building.

E-Coated Coil Cleaning

Documented routine cleaning of e-coated coils is required to maintain coating warranty coverage.

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

Surface loaded fibers or dirt should be removed prior to water rinse to prevent restriction of airflow.

If unable to back wash the side of the coil opposite of the coils entering air side, then surface loaded fibers or dirt should be removed with a vacuum cleaner. If a vacuum cleaner is not available, a soft non-metallic bristle brush may be used. In eithe

Coil surfaces can be easily damaged (fin edges bent over) if the tool is applied across the fins.

Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil.

This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity clean water rinse.

A monthly clean water rinse is recommended for coils that are applied in coastal or industrial environments to help to remove chlorides, dirt, and debris.

It is very important when rinsing, that water temperature is less than 130°F and pressure is than 100 psig to avoid damaging the fin edges. An elevated water temperature (not to exceed 130°F) will reduce surface tension, increasing the ability to remove

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. Coil cleaning shall be part of the unit’s regularly scheduled maintenance procedures. Failure to clean an e-coated coil will void

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

For routine quarterly cleaning, first clean the coil with the below approved coil cleaner.

After cleaning the coils with the approved cleaning agent, use the approved chloride remover to remove soluble salts and revitalize the unit.

Recommended Coil Cleaner

The following cleaning agent, 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 e-coated coils to remove

mold

mildew

dust

soot

greasy residue

lint and other particulate

Enviro-Coil Concentrate, Part Number HEC01.

Recommended Chloride Remover

CHLOR*RID DTS™ should be used to remove soluble salts from the e-coated coil, but the directions must be followed closely.

This product is not intended for use as a degreaser. Any grease or oil film should first be removed with the approved cleaning agent.

Remove Barrier

Soluble salts adhere themselves to the substrate. For the effective use of this product, the product must be able to come in contact with the salts.

These salts may be beneath any soils, grease or dirt; therefore, these barriers must be removed prior to application of this product. As in all surface preparation, the best work yields the best results.

Apply CHLOR*RID DTS

Apply directly onto the substrate. Sufficient product must be applied uniformly across the substrate to thoroughly wet out surface, with no areas missed.

This may be accomplished by use of a pump-up sprayer or conventional spray gun. The method does not matter, as long as the entire area to be cleaned is wetted.

After the substrate has been thoroughly wetted, the salts will be soluble and is now only necessary to rinse them off.

Rinse

It is highly recommended that a hose be used, as a pressure washer will damage the fins. The water to be used for the rinse is recommended to be of potable quality, though a lesser quality of water may be used if a small amount of CHLOR*RID DTS is added.

Check with CHLOR*RID International, Inc. for recommendations on lesser quality rinse water.

Winterizing Coils

In some cases it may be necessary to winterize water coils to prevent them from freezing.

First completely drain the coils. There is a drain located below the ‘water in’ connection and a vent connection located above the ‘water out’ connection. Auxiliary drain piping can also be added to exterior water piping if yearly winterizing is necessary

After the coil is drained, fill with an antifreeze solution using a circulating pump. Then thoroughly drain.

Removing Coils

Coils on the M3 units can be removed from either side of the unit.

The coils are independently supported so they can be removed independently from either side of the unit.

To remove a coil, first disconnect the water piping from the coil. Remove the coil access panel on the side from which the coil is to be removed.

Remove the screws connecting coil end panel to the coil. Slide the coil straight out onto a support that is at the same level as the coil.

CAUTION!Take care that the coil is not dropped or knocked over. This could damage the coil fins, or cause a leak in the coil.

To replace the coil, the above procedure should be reversed.

The coil should first be placed on a support that is at the same level as the coil position in the unit.

The coil should then be slid straight into the unit.

The upper coil location has angles on both the front and back side of the coil; the lower coil has an angle on the downstream side of the coil and guides on the upstream side.

Be sure that the coil is all the way up against the front (downstream) side of the coil, this should center the coil in the opening.

Push the coil all the way in so that the return-bend side of the coil is between 1/8” and 1/4” from the inside wall of the unit. For cooling coils, be sure that the vertical headers are entirely over the drain pan.

Screw the coil end panel to the coil using self-tapping sheet metal screws.

Figure 35 - Coil Removal

Doors/Panels

Removable access panels are provided directly across from most access doors. If regular access is required from the panel side of the unit, the doors and panels can be swapped or additional doors can be ordered from the factory.

Contact sales representative to order additional parts.

Note: For safety, inside-opening doors are used in positive pressure sections and outside-opening doors are used in negative pressure sections. The opening direction of doors cannot be changed.

WARNING! Shut off power to unit and wait for fans to stop turning before removing an access panel. To make sure the unit is not pressurized, open door opposite the access panel. Serious injury can result from removing a panel under positive pressure.

To remove an access panel, remove bolts from the perimeter.

When replacing a panel, make sure that the neoprene gasket on the panel is not damaged

Do not over-tighten the bolts as this could cause the rivet-nuts to come loose.

Figure 36 - Access Door/Panel Removal

Outside Opening Door and Panel

To switch the door and access panel locations remove panel and remove door by removing the screws connecting the hinge to the unit.

For inside opening doors, the gap covers around the door opening should also be removed.

Figure 37 - Access Door

Install the door on the opposite side of the unit by attaching the hinge to the unit. Be sure that the door is centered in the opening.

Rubber gasket needs to be applied on the door jamb of the new door side. The door latch parts will need to be removed and replaced on the new door side.

Filters

Pleated filters install from upstream side of filter rack.

Filters are installed in columns. For each column open snap-fasteners and remove first filter.

Slide the rest of the filters to the opening and then remove.

Bag and cartridge filters are installed with a type 8 holding frame.

Use the provided clips to attach new filters. Be sure to remove prefilter clips from cartridge filters before discarding.

Pre-filter clips will need to be attached to replacement cartridge filters.

Source: Aaon

Please note that any procedure, checklist, or other document available in the MaintainX Procedure Hub is provided for general education and information only and does not constitute legal, medical, or financial advice. MaintainX makes the materials available AS IS and AS PROVIDED, without warranties of any kind. By downloading or using any such materials, you assume the risk that they may not be appropriate for your specific situation and agree that you are solely responsible for any such use, including compliance with applicable law and with meeting any conditions of product warranties.

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