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AAON M2 Series 1,000-14,500 Indoor Air Handlers Unit Yearly

The AAON M2 Series 1,000-14,500 Indoor Air Handlers Unit Yearly aims to maintain the quality performance of your machine. Quickly identify components that need to be replaced or repaired.

MaintainX

04/26/2021

AAON M2 Series 1,000-14,500 Indoor Air Handlers Unit Yearly

The AAON M2 Series 1,000-14,500 Indoor Air Handlers Unit Yearly aims to maintain the quality performance of your machine. Quickly identify components that need to be replaced or repaired.

Clean the coils with water or noncorrosive coil cleaner

Clean the drain line, “P” trap, and condensate pan.

Check refrigerant pressures and temperatures every Spring.

Check heating section every Fall.

Check all electrical connections for tightness and check heater elements for indications of overheating.

Fan Assembly

M2 Series units use backward curved fan wheels which are non-overloading, energy efficient and easy to clean.

Cleaning the wheels is necessary to reduce electrical use, maintain capacity, and reduce stress on the unit. The wheel and fan section need to be inspected periodically and cleaned of dust or debris.

To inspect and clean the blower, set thermostat to the “OFF” position. Turn the electrical power to the unit to the “OFF” position at the disconnect switch. Clean the assembly.

Check the bearings. Inspect the belt condition and tightness.

Check screws for tightness. Rotate blower wheels while listening closely to each bearing to check for noise or roughness in the bearing, which can indicate a failing bearing.

Bearings

AAON uses pre-lubricated bearings, and bearings that have been sized for an average failure rate of 50% after 200,000 hours, or 22.8 years, of operation (see heading “Lubrication” in this section for more information).

The bearing sizing tables below are based on rotational speeds and radial loading. However, the alignment of the bearing to the shaft and the security of the bearing inner race to the shaft will greatly affect bearing life.

Even though the manufacturer is responsible for bearing tolerances and mounting design, the servicer is advised to regularly check the security of the bearing locking system.

Table 19 - Bearing Setscrew Torque Recommendations

Belts

Belt drive misalignment is one of the most common causes of premature belt failure. A belt can be destroyed in a matter of days if the drives have been aligned incorrectly.

The most common tool for measuring misalignment is a straightedge. Hold the straightedge flush across one pulley to gauge the degree of misalignment of the two sheaves.

The maximum allowed misalignment is one half degree of angular misalignment, and 1/10th of an inch per foot between sheave centers for parallel misalignment.

Figure 49 - Angular Misalignment

Correct by moving the position of the motor.

Figure 50 - Parallel Misalignment

Correct by adjusting sheaves on one, or both shafts.

Frequent belt tensioning is highly recommended. Most belt manufacturers would suggest a re-tensioning after as little as 8 hours of operation.

A simplified method of adjusting tension is to gauge the amount of force required to deflect the belt by 1/64th of an inch per inch of distance between sheave centers.

For example, if the sheaves are 20 inches apart, then the amount of deflection with the forces listed below is 20/64th (5/16th) of an inch.

Deflection required for

“A” belts: 4-6 lbs.
“B” belts: 6-10 lbs.
“C” belts: 10-18 lbs.

Figure 51 - Belt Deflection

Indoor Coils

Indoor cooling/evaporator coils must be cleaned regularly to maintain unit efficiency and operation.

Dirty evaporator coils will eventually freeze up and often result in a time consuming and expensive service call.

Clean filters will help to prevent dirt from accumulating on cooling coils, however cooling coils should be cleaned at least annually by an HVAC professional.

Refrigeration Cycle

Satisfactory performance of the refrigeration cycle can be determined by measuring suction line superheat. In order to determine if refrigerant flowing from the evaporator is dry, ensure that the system has enough refrigerant to produce liquid line subcoo

Refrigerant cycle analysis is best performed in conditions that approach the conditions where the air conditioner will be expected to operate.

Brazed Plate Heat Exchanger Cleaning

Because of a normally high degree of turbulence in brazed plate heat exchangers, for many applications the heat exchanger channels are self-cleaning.

For applications that are not self-cleaning (i.e. hard water at high temperatures, etc.) or applications where additional cleaning is desired, it is possible to clean the brazed plate heat exchanger by circulating a cleaning liquid.

Use a tank with weak acid, 5% phosphoric acid (H3PO4) or, if the exchanger is frequently cleaned, 5% oxalic acid (H2C2O4). Pump the cleaning liquid through the exchanger.

For optimum cleaning, the cleaning solution flow rate should be a minimum of 1.5 times the normal flow rate, preferably in a back-flush mode. After cleaning, the heat exchanger must be rinsed with clean water. A solution of 1-2% sodium hydroxide (NaOH) or

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

If a vacuum cleaner is not available, a soft non-metallic bristle brush may be used. In either case, the tool should be applied in the direction of the fins. 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 wa

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 10

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 the warranty and may result in reduced efficiency and durability.

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 ot

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.

Electric Heating

Set thermostat in the heat mode; call for heat to engage all electric heat strips.

Check blower for proper rotation and voltage.

Measure the amperage and voltage. Compare them to the nameplate data.

If applicable, check remote heat pump condenser as per the manufacturer’s recommendations.

Steam or Hot Water Heating

Set thermostat in the heat mode. Observe supply blower for proper rotation and voltage.

Check boiler or hot water operation according to the manufacturer’s instructions.

Check control flow valves for correct operation and settings per the manufacturer’s instructions.

Cleaning

Inspect and clean unit interior at the beginning of each heating and cooling season and as operating conditions require.

Chilled Water

Check remote chiller operations as per the manufacturer’s instructions.

Check coolant flow valves for correct operation and settings.

DX Water Source Cooling

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

Check the fan for correct operating direction, amperage, and voltage.

Check compressor operation, rotation, amperage, and voltage to the unit nameplate (check the amperage on the load side of the compressor contactor).

Condensate Drain Pans

Drain pans will have moisture present and require periodic cleaning to prevent microbial growth.

Cleaning of the drain pans will also prevent any possible plugging of the drain lines and overflow of the pan itself.

Cleaning of the drain pans and inside of the unit should be done only by a qualified service technician.

Duct Furnace

The duct furnace should be inspected annually by a qualified service agency. The condition should be determined.

condition of the burners

heat exchanger

draft inducer

vent system

operating controls

wiring

Check for obvious signs of deterioration, accumulation of dirt and debris and any heat or water related damage.

Any damaged or deteriorated parts should be replaced before the unit is put back into service.

Check the automatic gas valve to insure the gas valve seat is not leaking.

Check wiring connections to be sure they are secure and inspect wiring for any deterioration.

Lubrication

Most motors and bearings are permanently lubricated. Some applications may require that bearings be re-lubricated periodically. The schedule will depend on the operating duty, temperature variations, and other atmospheric conditions.

For bearings equipped with lubrication fittings, the lubrication schedule is dependent on operating temperatures and rotational speeds as shown in the table below.

Lithium based grease conforming to an NLGI grade No. 2 consistency is recommended. This medium viscosity, low torque grease is rust inhibiting and waterresistant. It is satisfactory for operating temperatures in the range of –10F to 250F.

Bearings should only be re-lubricated when at normal operating temperatures and not running. Rotate the fan shaft by hand, adding only enough grease to purge the seals. A one-inch bearing has a total grease capacity of only .25 ounces. Added grease should

DO NOT OVER LUBRICATE.

Recommended greases are: SHELL OIL - DOLIUM R CHEVRON OIL - SRI No. 2 TEXACO INC. - PREMIUM RB

Table 20 - Fan Bearing Lubrication Schedule

In the event the unit is not functioning correctly and a service company is required, only a company with service technicians qualified and experienced in both commercial heating and air conditioning should be permitted to service the systems in order to

Replacement Parts

Parts for AAON equipment may be obtained from your local AAON representative. When ordering parts, reference the unit serial number and part number.

Note: Before calling, technician should have model and serial number of the unit available for the service department to help answer questions regarding the unit.

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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