Performing routine maintenance and inspection of your AboveAir Technologies unit is imperative for maintaining peak operating condition. A minimum maintenance and inspection schedule will include all of the checks indicated here. Site conditions, including water and air quality, may necessitate more frequent maintenance than the minimums indicated here. All maintenance should be performed by qualified technicians familiar with the safety requirements for working on HVAC equipment.
Drive belts should be examined prior to start-up and then checked monthly for wear and correct tension. An over tensioned belt can cause wear; an under tensioned belt can cause slippage and excessive noise. If the two legs of the belt are pressed in midway between the pulley and the sheave, a properly tensioned belt will result in 1 to 1-1/2 inches of movement. Belt tension can be adjusted by means of the adjusting bolt attached to the motor bracket. Larger units may have motors mounted to a support on the bottom pan, which requires loosening of four nuts to adjust the motor location and change belt position.
Drive belts should be examined prior to start-up and then checked monthly for wear and correct tension. An over tensioned belt can cause wear; an under tensioned belt can cause slippage and excessive noise. If the two legs of the belt are pressed in midway between the pulley and the sheave, a properly tensioned belt will result in 1 to 1-1/2 inches of movement. Belt tension can be adjusted by means of the adjusting bolt attached to the motor bracket. Larger units may have motors mounted to a support on the bottom pan, which requires loosening of four nuts to adjust the motor location and change belt position.
Checks of the blower system should be performed biannually at minimum. Check the blower wheel for any signs of damage. Verify that the blower wheel is mounted tightly on the shaft and does not make contact with the unit housing. The squirrel cage should rotate freely. Check that the blower motor mounts, all housing bolts, and all electrical connections are secure.
The blower motor features permanently lubricated bearings and should not require lubrication during the useful life of the equipment.
All cooling and heating coils should be maintained biannually. Inspect the coil for bent or damaged fins and repair if necessary. Clear all debris from the coil(s) using industry standard coil cleaning techniques. Brushes, pressurized air, water, or commercial cleaning solutions may be used. Do not use a pressure washer. Check all coil connections for signs of damage or leakage and repair as necessary.
Inspect the drain pan monthly to verify it is free from debris and leaks. Verify that the drain is clear and that the drain pan is draining properly.
Biannually, inspect the components in the electrical panel. Confirm that all electrical connections are tight. Check all contacts for pitting.
A dirty filter results in increased static pressure and leads to less efficient operation. Do not wait for the dirty filter switch alarm for filter maintenance unless you have calibrated it to a desired pressure drop. Examine the filter monthly, as a minimum, and replace when necessary. Frequency of filter replacement will vary based on specific local conditions and outside air percentage. High outside air units will typically require filter replacement monthly.
Biannually, inspect the refrigerant system. Check the sight glass to verify that the system is moisture free. Inspect refrigerant piping for signs of damage or leaking.
Follow the maintenance recommendations for blowers, belts, and coils. During fall operation with a remote outdoor condensing section, ensure that leaves are not allowed to build up around the unit and disrupt airflow. During winter operation with a remote condensing section, do not allow snow to build up on or around the unit.
Biannually, inspect the water or glycol piping and any valves for signs of leakage or corrosion. Check the glycol solution concentration to ensure it meets the system requirements.
Biannually, inspect the piping and control valves for any signs of leakage or corrosion.
Biannually, clean the condensate pump and verify operation.
Examine the humidifier cylinder on a monthly basis for build-up. Refer to the supplemental humidifier IOM manual for further information.