A detailed AHU WEEKLY preventive maintenance checklist
1. Visual Inspection
2. Air Filters
- Visually examine filters for accumulated dirt.
- Look for visible debris or blockages.
- Use a flashlight if necessary to inspect thoroughly.
- Remove filters carefully from their housing.
- Clean reusable filters with water or compressed air.
- Replace disposable filters with new ones if dirty.
- Record the filter type in maintenance logs.
- Write down the date of last replacement.
- Update records immediately after maintenance is performed.
- Ensure filters fit snugly in their housings.
- Inspect for any gaps or misalignments.
- Adjust or replace filters to ensure a proper seal.
- Check housings for dust buildup or debris.
- Look for cracks or physical damage.
- Clean housings as needed before reinstalling filters.
- Use a manometer to measure pressure drop.
- Compare readings to manufacturer specifications.
- Replace filters if readings exceed recommended limits.
- Cross-check filter specifications with equipment manual.
- Ensure size and type match installation requirements.
- Consult manufacturer if unsure about specifications.
- Check pre-filters for dirt and wear.
- Clean or replace pre-filters as needed.
- Document the condition of pre-filters in logs.
- Record filter conditions and observations.
- Note any cleaning or replacements performed.
- Ensure documentation is clear and accessible.
- Check for directional arrows on filters.
- Install filters with airflow direction indicators.
- Confirm orientation before securing filters in place.
- Smell for musty or unusual odors.
- Inspect filters for mold or microbial growth.
- Address moisture sources if growth is detected.
- Set calendar reminders for next maintenance.
- Consider usage patterns for scheduling.
- Refer to manufacturer’s recommendations for timing.
3. Fan and Motor Checks
- Check for visible cracks or chips on the blades.
- Ensure blades are securely attached and not loose.
- Look for signs of corrosion or material degradation.
- Verify that blades are clean and free from debris.
- Identify any rattling, grinding, or squeaking sounds.
- Note any changes in sound during operation.
- Determine if noise is consistent with normal operation.
- Inspect for loose components if unusual noises are present.
- Inspect bearings for visible wear or damage.
- Ensure bearings are adequately lubricated as per guidelines.
- Check for any unusual resistance during manual rotation.
- Replace bearings if signs of wear are detected.
- Use a tachometer to measure fan speed.
- Compare measured speed to manufacturer specifications.
- Adjust fan speed settings if necessary.
- Document speed readings for future reference.
- Check mounting bolts for tightness and security.
- Inspect for any signs of movement during operation.
- Use a vibration meter to assess stability.
- Address any loose components immediately.
- Inspect all metal parts for discoloration and flaking.
- Use a wire brush to remove light corrosion.
- Apply anti-corrosive treatment where necessary.
- Replace corroded components if structural integrity is compromised.
- Check for cracks or holes in the housing.
- Look for signs of air leaks around joints.
- Ensure seals are intact and functioning properly.
- Repair or replace any damaged housing components.
- Inspect all terminals for tightness and cleanliness.
- Look for corrosion on connectors and wires.
- Clean connections as needed with appropriate tools.
- Replace corroded wires or connectors immediately.
- Use an ammeter to measure current draw.
- Document the measurements for record-keeping.
- Compare results with manufacturer's specified limits.
- Investigate any discrepancies for potential issues.
- Check the motor casing for excessive heat.
- Feel for abnormal temperature during operation.
- Ensure adequate airflow around the motor.
- Investigate causes of overheating if detected.
- Use alignment tools to verify proper positioning.
- Check for any misalignment signs during operation.
- Adjust as needed to maintain proper alignment.
- Recheck alignment after adjustments are made.
- Inspect guards for physical integrity and secure attachment.
- Ensure no gaps or openings that could pose hazards.
- Replace any damaged safety covers immediately.
- Document the condition of safety measures in maintenance logs.
- Engage sensors and switches to verify functionality.
- Check for proper response to fan operation.
- Replace faulty sensors or switches immediately.
- Document testing results for compliance.
- Use appropriate cleaning tools to remove dust.
- Vacuum or blow out debris from hard-to-reach areas.
- Ensure no cleaning materials obstruct moving parts.
- Document cleaning activities in the maintenance log.
4. Belts and Pulleys
- Check for fraying, cracking, or glazing.
- Ensure belts are properly tensioned according to specifications.
- Confirm belts are aligned with pulleys using a straight edge.
- Look for signs of slippage or abnormal wear patterns.
- Inspect pulleys for cracks, dents, or surface damage.
- Ensure all mounting hardware is tight and secure.
- Check for proper alignment with belts.
- Look for any excessive play or wobble in the pulleys.
- Loosen belt tensioner or mounting hardware using appropriate tools.
- Adjust the tension to the manufacturer's specified level.
- Replace belts if worn beyond acceptable limits.
- Ensure new belts are installed with proper alignment.
- Check for fraying, cracking, or glazing.
- Ensure belts are properly tensioned according to specifications.
- Confirm belts are aligned with pulleys using a straight edge.
- Look for signs of slippage or abnormal wear patterns.
- Inspect pulleys for cracks, dents, or surface damage.
- Ensure all mounting hardware is tight and secure.
- Check for proper alignment with belts.
- Look for any excessive play or wobble in the pulleys.
- Loosen belt tensioner or mounting hardware using appropriate tools.
- Adjust the tension to the manufacturer's specified level.
- Replace belts if worn beyond acceptable limits.
- Ensure new belts are installed with proper alignment.
5. Condensate Drainage
- Visual inspection for debris or obstructions.
- Use a flashlight to check hidden areas.
- Clear any blockages immediately using appropriate tools.
- Remove any visible debris from the pan.
- Wipe down the pan with a suitable cleaner.
- Check for any signs of rust or damage.
- Activate the pump manually to check operation.
- Listen for unusual noises during operation.
- Ensure the pump turns off after the water level drops.
- Observe the water level in the pan.
- Ensure it is below the overflow level.
- Adjust drain settings if necessary.
- Look for rust, discoloration, or moisture on pipes.
- Check all joints and connections for leaks.
- Replace any corroded or leaking sections immediately.
- Inspect the discharge line visually for blockages.
- Run water through the line to test flow.
- Remove any obstructions found in the line.
- Check for loose screws or bolts on the pump.
- Ensure the pump is level and stable.
- Confirm proper electrical connections are secure.
- Manually lift the float switch to test activation.
- Ensure the pump activates and deactivates correctly.
- Replace the float switch if it does not function.
- Check for blockages or buildup in the trap.
- Clean the trap using appropriate cleaning methods.
- Ensure the trap is functioning as designed.
- Visual inspection of the slope of the drain.
- Use a level to measure the slope accurately.
- Adjust the drain setup if it is not sloped.
- Listen for grinding, rattling, or excessive noise.
- Document any unusual sounds for further investigation.
- Schedule repairs if abnormal sounds are detected.
- Inspect surfaces for discoloration or growth.
- Use a mold remover or bleach solution for cleaning.
- Rinse thoroughly and ensure the area is dry.
- Record all inspections and maintenance actions taken.
- Note any issues and recommended follow-up actions.
- Ensure documentation is accessible for future reference.
6. Electrical Components
- Use a torque wrench to ensure connections are tight.
- Look for frayed wires or corrosion.
- Secure loose connections with appropriate fasteners.
- Document any damaged components for replacement.
- Test each safety switch to confirm functionality.
- Check for physical damage or misalignment.
- Ensure all controls respond correctly to inputs.
- Replace any faulty switches immediately.
- Calibrate sensors and thermostats if necessary.
- Record temperature readings and compare to set points.
- Check for accurate response to environmental changes.
- Log any discrepancies for further analysis.
- Use a torque wrench to ensure connections are tight.
- Look for frayed wires or corrosion.
- Secure loose connections with appropriate fasteners.
- Document any damaged components for replacement.
- Test each safety switch to confirm functionality.
- Check for physical damage or misalignment.
- Ensure all controls respond correctly to inputs.
- Replace any faulty switches immediately.
- Calibrate sensors and thermostats if necessary.
- Record temperature readings and compare to set points.
- Check for accurate response to environmental changes.
- Log any discrepancies for further analysis.
- Look for tripped breakers and reset them if necessary.
- Check for signs of overheating or burning.
- Ensure breakers operate smoothly without resistance.
- Replace any breakers that show signs of failure.
- Use a multimeter to measure voltage and current.
- Compare readings with manufacturer specifications.
- Check for fluctuations that may indicate problems.
- Document all measurements for future reference.
- Inspect wires for discoloration or melting.
- Feel for excessive heat on terminals and connections.
- Replace any components showing signs of overheating.
- Ensure proper airflow around electrical components.
- Activate relays and contactors manually.
- Listen for clicking sounds indicating operation.
- Check for proper engagement and disengagement.
- Replace any non-responsive relays or contactors.
- Inspect enclosures for physical damage or wear.
- Check gaskets and seals for integrity.
- Tighten screws and fasteners to secure enclosures.
- Replace any damaged components to maintain protection.
- Use a contact cleaner to remove oxidation.
- Inspect contacts for wear or pitting.
- Ensure contacts fit snugly without excessive play.
- Document cleaning and any required replacements.
- Check for cracks, frays, or abrasions on insulation.
- Ensure proper routing away from sharp edges.
- Look for signs of exposure to moisture or chemicals.
- Replace damaged insulation immediately to ensure safety.
- Record any issues found during inspections.
- Suggest specific repairs or replacements needed.
- Prioritize actions based on safety and operational impact.
- Share findings with relevant personnel for follow-up.
7. Control System
- Access control system interface.
- Compare settings against baseline or operational standards.
- Adjust any discrepancies found in the settings.
- Document any changes made for future reference.
- Navigate to the diagnostics section of the control system.
- Record any error codes or active alarms.
- Refer to the manual for troubleshooting guidance.
- Resolve issues as necessary and clear alarms.
- Check for available updates for the control system software.
- Download updates from the manufacturer's website.
- Follow update instructions carefully to avoid system issues.
- Restart the system to apply changes.
- Visual inspection of all wiring and connections.
- Look for frayed wires, corrosion, or loose connections.
- Tighten or replace damaged components as needed.
- Document any repairs made for future reference.
- Test signal transmission from the control system to devices.
- Check for proper response from sensors and actuators.
- Ensure no communication errors are present.
- Document results of the communication tests.
- Interact with all user interfaces to check responsiveness.
- Ensure touch screens and remote access function properly.
- Test all buttons and features for correct operation.
- Document any issues encountered during testing.
- Use calibrated reference equipment for comparison.
- Adjust sensors to meet specified accuracy levels.
- Document calibration results and any adjustments made.
- Schedule future calibration checks as needed.
- Review current system performance data.
- Adjust setpoints according to operational needs.
- Ensure setpoints align with efficiency standards.
- Document any adjustments for future reference.
- Test the backup power system to ensure functionality.
- Check battery levels and replace if necessary.
- Verify automatic switching works during a power outage.
- Document status of the backup power supply.
- Maintain a log of all changes, including dates and reasons.
- Ensure all team members are informed of updates.
- Review documentation for accuracy and completeness.
- Store logs in a centralized location for easy access.
- Create scenarios to simulate various operational states.
- Observe system response to simulated conditions.
- Record performance metrics during the test.
- Identify and address any performance issues noted.
- Check firmware versions for each component.
- Download and install updates as necessary.
- Follow manufacturer instructions for firmware updates.
- Document any updates applied for future reference.
- Record any unexpected findings during inspections.
- Analyze anomalies to determine potential causes.
- Take corrective action as needed.
- Document all findings and actions taken.
8. Airflow Measurements
- Use a calibrated anemometer for accurate readings.
- Position the device at the center of each vent.
- Record measurements for both supply and return vents.
- Ensure the system is operating under normal conditions.
- Inspect coils and filters for cleanliness and obstructions.
- Use airflow measurement tools to assess performance.
- Compare readings with manufacturer specifications.
- Ensure airflow is sufficient for proper heat exchange.
- Record all measurements and observations systematically.
- Note any deviations from expected airflow values.
- Implement corrective measures as needed.
- Update maintenance logs with findings and actions taken.
- Use a calibrated anemometer for accurate readings.
- Position the device at the center of each vent.
- Record measurements for both supply and return vents.
- Ensure the system is operating under normal conditions.
- Inspect coils and filters for cleanliness and obstructions.
- Use airflow measurement tools to assess performance.
- Compare readings with manufacturer specifications.
- Ensure airflow is sufficient for proper heat exchange.
- Record all measurements and observations systematically.
- Note any deviations from expected airflow values.
- Implement corrective measures as needed.
- Update maintenance logs with findings and actions taken.
- Check labels on diffusers for correct airflow direction.
- Use smoke or airflow indicators to visualize direction.
- Adjust diffusers if airflow is misdirected.
- Document any changes made to diffuser settings.
- Identify critical points based on system design and layout.
- Use anemometer to measure airflow at these junctions.
- Ensure measurements reflect system performance.
- Document results for future reference.
- Select the appropriate anemometer for the task.
- Measure air velocity at various points in the system.
- Use the formula: Airflow (CFM) = Velocity (FPM) x Area (sq ft).
- Record all calculations for documentation.
- Visually inspect ducts for blockages or restrictions.
- Use a flashlight for better visibility in dark areas.
- Clear any identified obstructions promptly.
- Document findings and any actions taken.
- Refer to design documents for airflow specifications.
- Analyze previous readings for trends and anomalies.
- Note any significant differences in your documentation.
- Make recommendations for adjustments if necessary.
- Use manometers or pressure gauges to measure differential pressure.
- Take readings at specified intervals for accuracy.
- Document results and compare to standards.
- Identify any pressure drops that may indicate issues.
- Inspect VAV boxes for proper operation.
- Measure airflow and compare with specifications.
- Adjust settings to ensure optimal performance.
- Document any findings or adjustments made.
- Check temperature readings in areas served by the AHU.
- Analyze airflow patterns and their effect on temperature.
- Make adjustments to balance temperature distribution.
- Document any changes and their outcomes.
- Use airflow visualization tools, if available.
- Identify any areas with excessive or insufficient airflow.
- Adjust diffusers and ducts to achieve balance.
- Record observations and adjustments for future reference.
- Remove dust and debris from measuring devices.
- Calibrate instruments according to manufacturer guidelines.
- Check for any damage or wear on devices.
- Document maintenance performed on measurement tools.
- Manually operate dampers to check for smooth movement.
- Inspect for any visible damage or misalignment.
- Adjust dampers to optimize airflow as necessary.
- Document any adjustments or repairs made.
9. System Performance
- Use calibrated instruments for accuracy.
- Record readings at various points in the system.
- Compare data to operational baselines.
- Document findings for future reference.
- Check pressure gauges at designated points.
- Refer to manufacturer specifications for acceptable ranges.
- Log any deviations from specifications.
- Investigate causes for any discrepancies.
- Analyze recorded data for trends.
- Identify areas where performance is lacking.
- Propose actionable recommendations.
- Discuss suggestions with maintenance team.
- Use an anemometer to measure airflow.
- Compare readings to design specifications.
- Identify blockages or restrictions if airflow is low.
- Adjust dampers or fans as necessary.
- Observe the economizer during operation.
- Ensure it adjusts based on outdoor conditions.
- Test for proper opening and closing of dampers.
- Log any malfunctions for repair.
- Use energy monitoring tools to gather data.
- Record usage over different time periods.
- Analyze for unusual spikes or drops.
- Report findings to management for review.
- Check VFD settings and programming.
- Monitor motor performance during operation.
- Look for error codes or alarms.
- Perform necessary calibrations or repairs.
- Measure temperatures at the inlet and outlet.
- Compare with expected temperature differentials.
- Look for signs of fouling or blockage.
- Schedule cleaning if temperatures are outside acceptable range.
- Listen for abnormal sounds during operation.
- Use a decibel meter to quantify noise levels.
- Identify the source of unusual sounds.
- Schedule maintenance for identified issues.
- Manually check damper positions.
- Observe operation during different system modes.
- Adjust actuator settings if needed.
- Document any issues for follow-up.
- Collect historical data from maintenance logs.
- Identify common trends or recurring problems.
- Discuss findings with the maintenance team.
- Adjust maintenance strategies based on analysis.
- Simulate failure conditions to test interlocks.
- Check all control panel indicators.
- Document any failures or anomalies.
- Repair or replace components as necessary.
- Use thermal imaging camera for scanning.
- Focus on motors, coils, and ductwork.
- Document any hotspots detected.
- Plan for corrective actions based on findings.
10. Documentation and Reporting
11. Safety Checks
- Review relevant safety guidelines.
- Communicate safety expectations to all team members.
- Conduct a safety briefing before starting work.
- Ensure all workers understand their roles in safety.
- Inspect safety gear for damage or wear.
- Ensure fire extinguishers are charged and accessible.
- Verify accessibility of first aid kits.
- Check that safety signage is visible and legible.
- Discuss emergency shutdown procedures.
- Share contact information for emergency services.
- Identify location of emergency exits.
- Review evacuation routes and assembly points.
- Inspect all access points for proper closure.
- Use locks or tags to secure access panels.
- Confirm that no unauthorized personnel can enter.
- Document any issues with access points.
- Check for frayed wires or exposed conductors.
- Ensure all connections are tight and secure.
- Look for signs of overheating or burning.
- Document any repairs needed for electrical components.
- Ensure lockout devices are applied to energy sources.
- Verify that all workers are trained in LOTO procedures.
- Check that tags are clear and legible.
- Conduct a LOTO audit to ensure compliance.
- Assess the specific hazards of the task.
- Provide appropriate PPE to all workers.
- Check that PPE is correctly worn and fitted.
- Replace any damaged or worn PPE immediately.
- Inspect the area for visible leaks.
- Use absorbent materials for any spills.
- Report leaks to maintenance management.
- Ensure proper disposal of hazardous materials.
- Check lighting levels in the work area.
- Clear any obstacles from pathways.
- Ensure adequate ventilation is present.
- Identify and mitigate any slip or trip hazards.
- Inspect tools for wear and functionality.
- Ensure calibration of precision instruments.
- Check that safety guards are in place.
- Document any faulty tools for repair or replacement.
- Check that exit signs are illuminated.
- Ensure pathways to exits are unobstructed.
- Conduct a visual inspection of exit doors.
- Test emergency lighting systems if applicable.
- Locate MSDS for all chemicals on site.
- Review hazards and safety precautions.
- Ensure MSDS are accessible to all workers.
- Train personnel on chemical handling procedures.
- Check the contents of the first aid kit.
- Restock any used items immediately.
- Ensure kit is easily accessible.
- Keep a log of first aid use.
Use in Manifestly