A detailed AHU DAILY preventive maintenance checklist

General Information

Visual Inspection

  • Examine all ductwork and connections thoroughly.
  • Look for moisture, discoloration, or condensation.
  • Check around joints and seams for potential leaks.
  • Use a flashlight if necessary to see difficult areas.
  • Look for dark spots or discoloration on surfaces.
  • Check for a musty smell indicating mold presence.
  • Inspect insulation for dampness or deterioration.
  • Identify any water stains on walls or floors nearby.
  • Check that all access panels are closed and latched.
  • Inspect for any cracks or damage on the panels.
  • Confirm that screws or fasteners are present and tight.
  • Ensure that gaskets around panels are in good condition.
  • Examine metal surfaces for rust spots or flaking.
  • Check for discoloration indicating corrosion underneath.
  • Inspect joints and seams for signs of wear.
  • Assess the overall condition of painted surfaces.
  • Look for dents, scratches, or other physical damage.
  • Check for missing panels or protective covers.
  • Inspect for wear on rubber or plastic components.
  • Ensure that the unit appears structurally sound.
  • Inspect all visible fasteners for tightness.
  • Identify any missing screws or bolts.
  • Check for signs of wear on fasteners.
  • Use a screwdriver or wrench to tighten as needed.
  • Examine insulation for tears, rips, or holes.
  • Check for signs of moisture or mold on insulation.
  • Ensure insulation is securely attached to surfaces.
  • Replace any damaged insulation promptly.
  • Inspect for droppings or nests around the unit.
  • Look for entry points where pests could enter.
  • Check for chewed wires or other damage.
  • Consider using traps or contacting pest control if needed.
  • Clear away any clutter or obstacles near the unit.
  • Inspect for any items that could impede airflow.
  • Ensure the area is accessible for future maintenance.
  • Check for any potential hazards in the vicinity.
  • Check for water accumulation in the drain pan.
  • Inspect drain lines for clogs or blockages.
  • Ensure proper drainage to prevent overflow.
  • Clean any debris from the drain area as needed.
  • Observe the fan and motor during operation.
  • Ensure that they are aligned without wobbling.
  • Check for unusual noises indicating misalignment.
  • Make adjustments if necessary to maintain proper operation.
  • Listen for irregular sounds that may indicate issues.
  • Feel for excessive vibrations on the unit casing.
  • Check that all components are securely mounted.
  • Investigate and address any abnormal operations.
  • Examine gaskets for cracks, tears, or brittleness.
  • Check seals around doors and access points.
  • Ensure that seals are creating a proper airtight fit.
  • Replace any damaged gaskets or seals immediately.
  • Use a level tool to check the unit's orientation.
  • Inspect mounting brackets for security and stability.
  • Ensure that the base is not warped or damaged.
  • Make adjustments to maintain a level position.

Air Filters

  • Visually examine filters for visible dirt or obstructions.
  • Use a flashlight if necessary to see into the filter housing.
  • Check both sides of the filter for contamination.
  • Document any significant dirt accumulation.
  • Remove filters carefully to avoid dust release.
  • If cleanable, use a vacuum or compressed air to remove dirt.
  • Replace filters that are too dirty or damaged.
  • Follow manufacturer guidelines for cleaning methods.
  • Use a manometer or pressure gauge to measure pressure drop.
  • Record pressure readings at both inlet and outlet.
  • Compare readings against manufacturer specifications.
  • Identify any significant drop indicating a clogged filter.
  • Examine frames for cracks, bends, or deterioration.
  • Ensure frames are free from rust and corrosion.
  • Replace any damaged frames to maintain filter integrity.
  • Document any findings and actions taken.
  • Check all fasteners and clips holding the filters in place.
  • Ensure there are no gaps that could allow bypass air.
  • Tighten any loose fittings to secure filters.
  • Record any issues found.
  • Note the type and size of each filter in use.
  • Update inventory management system with this data.
  • Ensure that stock levels are adequate for replacements.
  • Document any changes made.
  • Inspect the perimeter of the filter housing.
  • Look for gaps or leaks that may cause bypass air.
  • Seal any identified leaks to improve efficiency.
  • Record any necessary repairs.
  • Review current filter change schedule.
  • Adjust frequency based on usage and air quality.
  • Document any changes to the replacement plan.
  • Notify relevant personnel of upcoming changes.
  • Check pre-filters for dirt and damage.
  • Assess their ability to capture larger particles.
  • Clean or replace pre-filters as necessary.
  • Document findings and actions taken.
  • Monitor airflow rates before and after filter changes.
  • Assess any changes in system performance.
  • Document observations related to airflow and efficiency.
  • Recommend adjustments based on findings.
  • Record the exact date of each filter change.
  • Include filter type and any relevant notes.
  • Update maintenance logs regularly.
  • Ensure logs are easily accessible for future reference.
  • Verify filter specifications against manufacturer guidelines.
  • Confirm dimensions, efficiency ratings, and materials used.
  • Replace with equivalent or better quality filters.
  • Document compliance with specifications.
  • Listen for abnormal sounds when the AHU is operating.
  • Inspect for vibrations that could signal filter problems.
  • Conduct further diagnostics if issues are detected.
  • Document any findings and actions taken.
  • Analyze historical data for filter changes and performance.
  • Identify any patterns in filter lifespan or effectiveness.
  • Adjust maintenance schedules based on historical trends.
  • Document insights gained from the review.

Fan and Motor

  • Use a soft cloth or brush to gently remove dirt.
  • Check for any obstructions that may affect airflow.
  • Ensure all areas of the blades are clean and free from buildup.
  • Stand close to the unit while it operates.
  • Identify any grinding, squeaking, or rattling sounds.
  • Document any unusual noises for further inspection.
  • Feel the motor casing for excessive heat.
  • Look for any discoloration or burnt smell.
  • Ensure the motor runs smoothly without stalling.
  • Use the appropriate lubricant as specified by the manufacturer.
  • Apply lubricant until it begins to seep out of the bearing.
  • Wipe away any excess to prevent dirt attraction.
  • Look for cracks, chips, or bends in the blades.
  • Check for any missing sections that could affect performance.
  • Replace blades if significant damage is observed.
  • Check for any signs of fraying or wear on the belts.
  • Ensure belts are tight but not overly strained.
  • Adjust tension as needed to maintain optimal performance.
  • Use a vibration meter to measure levels during operation.
  • Identify sources of excessive vibration and rectify them.
  • Balance the fan if necessary to reduce vibrations.
  • Inspect mounting brackets for corrosion or damage.
  • Tighten any loose screws, bolts, or nuts.
  • Ensure stability during operation to avoid vibrations.
  • Use a multimeter to take accurate readings.
  • Compare measurements with the manufacturer's specifications.
  • Document findings for future reference.
  • Examine all connections for signs of rust or deterioration.
  • Tighten any loose wires or connections as needed.
  • Replace any corroded components to ensure safety.
  • Use a vacuum or soft brush to remove debris.
  • Ensure the area is free from obstructions.
  • Regular cleaning prevents overheating and prolongs motor life.
  • Activate the fan and observe its startup sequence.
  • Ensure it stops without hesitation or noise.
  • Document any irregularities during the test.
  • Examine the alignment visually or with a straightedge.
  • Adjust as necessary to ensure smooth operation.
  • Misalignment can cause excess wear on components.
  • Use a thermometer to check the temperature near the motor.
  • Ensure it remains within acceptable limits.
  • Address any overheating issues promptly.
  • Look for any physical damage or deterioration.
  • Check for proper sealing to prevent air leaks.
  • Replace any damaged components to maintain efficiency.
  • Confirm that all components meet specified standards.
  • Check for updates or recalls on parts.
  • Ensure proper installation as per guidelines.
  • Use an anemometer to measure airflow rates.
  • Adjust dampers or settings to optimize performance.
  • Ensure clean filters to maintain adequate airflow.
  • Keep a detailed log of inspections and maintenance actions.
  • Note any issues that need follow-up or repair.
  • Use this documentation for future reference and compliance.

Coils

  • Remove any visible dust or debris.
  • Use a soft brush or vacuum for delicate areas.
  • Check for any buildup that may affect performance.
  • Ensure surrounding areas are also clean to prevent contamination.
  • Look for water stains or corrosion on the coils.
  • Inspect fittings and joints for moisture.
  • Use a leak detection solution if necessary.
  • Document any findings for further action.
  • Check for obstructions in front of the coils.
  • Verify that fan operation is within expected parameters.
  • Listen for unusual noises indicating airflow issues.
  • Measure airflow using an anemometer if needed.
  • Use a coil cleaner suitable for the coil type.
  • Apply cleaner and let it sit as per instructions.
  • Rinse thoroughly with water to remove residue.
  • Ensure coils are dry before re-energizing the system.
  • Look for bent, broken, or corroded fins.
  • Use a fin comb to repair any damaged fins.
  • Check for any signs of rust or deterioration.
  • Document any issues for repair planning.
  • Use a fin straightening tool or comb for precision.
  • Gently straighten fins without causing further damage.
  • Check airflow after adjustments to ensure improvement.
  • Reinspect regularly to maintain straightened condition.
  • Remove any debris from the drain pan.
  • Ensure that the drain line is clear and flowing.
  • Inspect for any signs of standing water.
  • Clean and disinfect the pan if mold is present.
  • Check calibration of sensors against standard temperatures.
  • Look for any physical damage to the sensors.
  • Ensure wires are connected securely.
  • Replace faulty sensors if readings are inconsistent.
  • Use a thermometer to measure inlet and outlet temperatures.
  • Calculate the differential to assess coil performance.
  • Note any significant deviations from expected values.
  • Report any irregularities for further investigation.
  • Look for fraying, tearing, or moisture in insulation.
  • Ensure insulation is properly covering all exposed areas.
  • Replace any damaged insulation to prevent energy loss.
  • Document condition for future maintenance planning.
  • Look for dark spots or discoloration on coils.
  • Check for dampness that could encourage growth.
  • Use a mold remediation cleaner if necessary.
  • Schedule regular inspections to prevent future growth.
  • Check that covers fit snugly without gaps.
  • Inspect for any signs of wear on the covers.
  • Replace any damaged or missing covers immediately.
  • Document cover status for maintenance records.
  • Record temperatures, airflow, and cleaning dates.
  • Use a standardized format for consistency.
  • Store records in an accessible location for review.
  • Analyze data periodically to track performance trends.
  • Assess the level of buildup against company standards.
  • Contact a certified HVAC cleaning service.
  • Schedule cleaning at a time that minimizes downtime.
  • Ensure proper documentation of the cleaning service.

Drainage System

  • Remove any debris or buildup from the pan.
  • Use a flashlight to check for hidden clogs.
  • Ensure the pan is positioned correctly.
  • Verify the pan's slope allows for proper drainage.
  • Inspect the entire length of the drain line visually.
  • Use a flexible brush or hose to clear any blockages.
  • Perform a water test to confirm drainage efficiency.
  • Check for any kinks or bends in the line.
  • Look for standing water near the base of the unit.
  • Inspect surrounding areas for leaks or overflow.
  • Assess the ground for proper drainage away from the unit.
  • Document any findings for future reference.
  • Use mild detergent and warm water for cleaning.
  • Rinse thoroughly to remove all cleaning agents.
  • Dry the pan completely to prevent mold growth.
  • Reinstall the pan securely after cleaning.
  • Check the pump for any unusual vibrations or noise.
  • Ensure the pump starts and stops as expected.
  • Verify the discharge line is clear and unobstructed.
  • Test the pump with water to confirm operation.
  • Manually lift the float to check pump activation.
  • Listen for the pump to engage when float rises.
  • Ensure the float moves freely without obstruction.
  • Replace the float switch if it is not functioning.
  • Inspect each joint visually for water stains or corrosion.
  • Use a tissue or cloth to check for moisture.
  • Tighten any loose connections as necessary.
  • Document any leaks for repair scheduling.
  • Look for cracks, tears, or missing insulation.
  • Check for moisture accumulation on the insulation.
  • Replace damaged insulation to prevent condensation.
  • Ensure insulation is securely fastened to the pipe.
  • Use a level to check the slope of the drain line.
  • Adjust any sections that are not properly sloped.
  • Ensure the slope directs water towards the drain outlet.
  • Document any adjustments made for future reference.
  • Check for proper installation of the device.
  • Perform a functional test to ensure it prevents backflow.
  • Inspect for signs of wear or damage.
  • Document the test results for compliance records.
  • Listen for rattling, grinding, or excessive noise.
  • Identify the source of any unusual sounds.
  • Document any unusual findings for further investigation.
  • Schedule maintenance if persistent issues are noted.
  • Take photographs of corroded areas for records.
  • Note specific locations and severity of deterioration.
  • Schedule repairs or replacements based on findings.
  • Report significant issues to maintenance personnel.
  • Check for patterns in previous inspections.
  • Identify any recurrent problems that need addressing.
  • Document any trends that may require attention.
  • Communicate findings with the maintenance team.
  • Prioritize repairs based on severity and urgency.
  • Coordinate with maintenance staff for scheduling.
  • Document all scheduled repairs and their timelines.
  • Follow up on completed repairs for effectiveness.

Controls and Sensors

  • Set thermostat to desired temperature.
  • Allow system to run for a few minutes.
  • Check if the temperature reaches set point.
  • Verify that the controls respond accurately to adjustments.
  • Check sensor mounting and positioning.
  • Test each sensor by simulating conditions.
  • Ensure switches engage and disengage smoothly.
  • Look for any visible signs of wear or damage.
  • Inspect the control panel for alerts.
  • Document any error codes displayed.
  • Refer to the manual for troubleshooting.
  • Reset alarms if resolved.
  • Use calibration tools as per manufacturer instructions.
  • Adjust sensors to ensure accurate readings.
  • Recheck readings post-calibration.
  • Document calibration results.
  • Check data logs for communication consistency.
  • Run diagnostics on the control system.
  • Test BMS commands to ensure responsiveness.
  • Document any communication failures.
  • Look for frayed wires or loose connections.
  • Check for corrosion on terminals.
  • Ensure all connections are secure.
  • Replace any damaged wiring immediately.
  • Simulate an emergency condition.
  • Activate the shut-off function.
  • Confirm that the system shuts down immediately.
  • Reset the system after testing.
  • Access the control system logs.
  • Look for irregular patterns or anomalies.
  • Document any findings for further investigation.
  • Set alerts for future unusual activities.
  • Review operational guidelines for the facility.
  • Compare current settings with recommended values.
  • Adjust settings as necessary to meet requirements.
  • Document any changes made.
  • Check the status of the backup power unit.
  • Test the backup power system by simulating an outage.
  • Ensure battery levels are adequate.
  • Replace batteries if they are low or expired.
  • Access each wireless sensor.
  • Check battery indicators or replace batteries.
  • Ensure proper installation of new batteries.
  • Document any replacements made.
  • Test each user interface for responsiveness.
  • Check for any error messages on displays.
  • Ensure accessibility for all users.
  • Document any issues for follow-up.
  • Check for available updates from the manufacturer.
  • Follow the update procedure carefully.
  • Backup current settings before updating.
  • Document the update process.
  • Record details of changes in a maintenance log.
  • Include date, time, and reason for changes.
  • Ensure documentation is accessible for future review.
  • Notify relevant personnel of changes made.

Ductwork

  • Examine joints and seams for gaps.
  • Look for any visible dents or bends.
  • Use a flashlight for better visibility.
  • Check for obstructions like debris or foreign objects.
  • Look for tears or gaps in insulation material.
  • Check for signs of moisture or mold.
  • Ensure insulation is securely attached.
  • Verify that R-value meets specifications.
  • Inspect duct joints for visible gaps.
  • Check for the presence of duct tape or sealant.
  • Ensure seals are not cracked or worn.
  • Test for air leakage using smoke or fog.
  • Examine surfaces for rust spots or flaking.
  • Check for discoloration indicative of corrosion.
  • Use a wire brush to assess the extent of corrosion.
  • Consider using rust treatment methods if necessary.
  • Check that panels close securely.
  • Ensure no obstructions block access.
  • Verify that screws or fasteners are in place.
  • Label panels for easy identification.
  • Inspect joints and seams for air escaping.
  • Use a smoke pencil to detect leaks.
  • Check for condensation around duct areas.
  • Mark any leaks for prompt repair.
  • Inspect hangers for rust or damage.
  • Check that supports are not loose or sagging.
  • Ensure all supports meet load requirements.
  • Tighten any loose fasteners.
  • Look for water stains or dripping.
  • Check for mold growth within ducts.
  • Assess insulation for wetness.
  • Identify sources of moisture intrusion.
  • Use a damp cloth or vacuum to clean surfaces.
  • Check for buildup at access points.
  • Ensure surrounding areas are also clean.
  • Dispose of debris according to regulations.
  • Inspect surrounding areas for any physical barriers.
  • Check that vents are not blocked.
  • Ensure that airflow is consistent across all ducts.
  • Use an anemometer for airflow measurement.
  • Manually operate dampers to check movement.
  • Ensure dampers are not stuck or misaligned.
  • Check that control mechanisms are functioning.
  • Verify that position matches system requirements.
  • Look for droppings or nests within ducts.
  • Check for chew marks on insulation.
  • Inspect around access points for entry signs.
  • Consider pest control measures if needed.
  • Ensure labels are clear and legible.
  • Check that labels indicate flow direction.
  • Verify that all duct sections are labeled.
  • Replace any missing or damaged labels.

Safety and Emergency Equipment

  • Locate all emergency shut-off switches.
  • Manually activate each switch to confirm operation.
  • Ensure switches reset properly after activation.
  • Document any issues for immediate attention.
  • Inspect all equipment for missing guards or covers.
  • Check for any signs of damage or wear.
  • Replace or repair any faulty components.
  • Verify that all guards are securely fastened.
  • Inspect fire dampers for visible damage.
  • Manually test each damper to ensure it opens and closes.
  • Check for any obstructions preventing operation.
  • Document findings and address any malfunctions.
  • Check all emergency lights for operational status.
  • Test battery backup systems for proper function.
  • Replace any burnt-out bulbs or faulty fixtures.
  • Ensure lights are positioned correctly for visibility.
  • Locate all fire extinguishers within the area.
  • Check for visible inspection tags and expiration dates.
  • Ensure extinguishers are easily accessible and not obstructed.
  • Confirm that pressure gauges indicate full status.
  • Walk through all designated exit routes.
  • Remove any obstacles or hazards blocking exits.
  • Ensure exit signs are illuminated and visible.
  • Document any issues that require corrective actions.
  • Inspect all safety signs for clarity and condition.
  • Replace any signs that are faded or damaged.
  • Ensure signs are positioned at appropriate heights.
  • Verify compliance with regulatory signage requirements.
  • Activate each alarm system to confirm functionality.
  • Listen for distinct sounds indicating alerts.
  • Document any alarms that fail to operate.
  • Schedule repairs for any non-functional systems.
  • Check all safety interlocks on machinery.
  • Confirm that interlocks prevent operation when not engaged.
  • Test interlocks by attempting to operate machinery.
  • Document any interlocks that require maintenance.
  • Open first aid kits to inspect contents.
  • Replace any expired or used items.
  • Ensure kits are easily accessible in emergencies.
  • Document the condition and contents of each kit.
  • Gather current emergency contact information.
  • Update any changes to procedures or contacts.
  • Distribute updated information to relevant personnel.
  • Confirm that all staff are aware of updates.
  • Inspect PPE for wear and tear.
  • Ensure adequate supply of necessary PPE.
  • Replace any damaged or expired equipment.
  • Confirm that PPE is stored in accessible locations.
  • Perform a thorough walk-through of the facility.
  • Look for potential hazards such as spills or obstructions.
  • Document any identified safety concerns.
  • Report findings to management for corrective action.

Documentation

Follow-Up Actions

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