A detailed Fan Coil Unit WEEKLY preventive maintenance checklists
General Safety Precautions
Visual Inspection
Air Filter Maintenance
Fan and Blower Assembly
- Turn off power to the unit.
- Remove the fan guard or cover.
- Use a soft brush or cloth to clean blades.
- Check for accumulated dust or grease.
- Reattach the fan guard securely.
- Use a wrench to check each bolt's tightness.
- Ensure bolts are snug but not overtightened.
- Look for any signs of wear on the bolts.
- Replace any damaged bolts as necessary.
- Start the fan and stand close to the unit.
- Listen for grinding, rattling, or squeaking noises.
- Identify the source of any unusual sounds.
- Document any findings for further inspection.
- Visually inspect each blade for cracks or bends.
- Check for any chips or missing sections.
- Ensure blades are securely attached to the hub.
- Replace any damaged blades immediately.
- Check alignment with the housing and mounting points.
- Adjust the position if misaligned.
- Look for signs of excessive vibration during operation.
- Ensure all mounting brackets are secure.
- Refer to the manufacturer's manual for lubrication points.
- Use the recommended lubricant type.
- Apply lubricant sparingly to avoid excess buildup.
- Wipe away any excess lubricant after application.
- Observe the fan's rotation during operation.
- Confirm the direction aligns with design specifications.
- If incorrect, reverse the wiring connections.
- Test the fan again to ensure correct direction.
- Check the control settings for speed adjustments.
- Test each speed setting during operation.
- Ensure each speed works smoothly without issues.
- Document any discrepancies in performance.
- Examine the blower housing for dust or debris.
- Use a vacuum or brush to clean the area.
- Ensure there are no blockages in the airflow path.
- Check for loose insulation or materials inside.
- Inspect each isolator for wear or damage.
- Check that they provide adequate support.
- Replace any isolators that are cracked or missing.
- Tighten any loose connections related to isolators.
- Inspect wiring and connections for discoloration.
- Look for frayed wires or loose terminals.
- Tighten any connections that appear loose.
- Replace any corroded components immediately.
- Locate sensors and switches connected to the fan.
- Use a soft cloth to clean sensor surfaces.
- Inspect for any signs of damage or wear.
- Test functionality after cleaning.
- Use an anemometer to measure airflow rates.
- Compare results to manufacturer specifications.
- Document any performance issues.
- Adjust fan settings as necessary to meet requirements.
Coil Inspection
- Examine the coils visually for any accumulation of dust or debris.
- Use a flashlight to inspect hard-to-see areas.
- Check airflow to ensure it is not obstructed.
- Use a soft brush to gently remove dirt from coil surfaces.
- If necessary, apply a coil cleaner according to the manufacturer's instructions.
- Rinse thoroughly to remove any cleaning residue.
- Inspect coils for any moisture or water stains.
- Look for signs of refrigerant leaks, such as oil spots.
- Use a leak detection solution if necessary.
- Examine fins closely for any visible damage.
- Use a fin comb to straighten bent fins gently.
- Ensure fins are evenly spaced for optimal airflow.
- Use a thermometer to measure incoming and outgoing air temperatures.
- Calculate the temperature difference to ensure it meets specifications.
- Document the results for future reference.
- Look for any rust spots or corrosion on coil surfaces.
- Treat affected areas with appropriate rust-inhibiting products.
- Repaint with heat-resistant paint if necessary.
- Inspect all connection points for tightness.
- Check for any signs of wear or damage at connection points.
- Tighten any loose connections as needed.
- Look for droppings or nests near the coils.
- Check for any signs of pest entry points.
- Consider pest control measures if necessary.
- Inspect seals around the coil casing for integrity.
- Replace any damaged or missing seals.
- Test for air leakage using a smoke pencil or similar tool.
- Check for any objects blocking airflow around the coils.
- Ensure surrounding areas are clear and free of debris.
- Adjust ductwork if necessary to improve airflow.
- Inspect coils for any visible mold or mildew.
- Use appropriate cleaning solutions to remove mold.
- Ensure coils are thoroughly dried to prevent recurrence.
- Check insulation for any tears or wear.
- Replace damaged insulation to maintain efficiency.
- Ensure insulation is properly fitted around the coils.
- Ensure the drain pan slopes correctly for drainage.
- Inspect for any standing water or blockages.
- Clean the drain pan to prevent overflow.
Drainage System
Electrical Components
Thermostat and Controls
- Set the thermostat to a desired temperature.
- Observe the system response time.
- Ensure the heating or cooling activates appropriately.
- Listen for any unusual noises during operation.
- Use a calibrated thermometer for comparison.
- Place the thermometer next to the sensor.
- Note any discrepancies in temperature readings.
- Adjust the sensor calibration if necessary.
- Test each control button or dial.
- Check for any sticking or unresponsive controls.
- Lubricate moving parts if needed.
- Verify smooth operation of control mechanisms.
- Examine all wiring for frays or damage.
- Look for corrosion at connection points.
- Ensure all connections are tight and secure.
- Replace any damaged wiring immediately.
- Switch to heating mode and set a high temperature.
- Wait for system activation and observe.
- Switch to cooling mode and set a low temperature.
- Confirm system operation and response.
- Review the current setpoint on the thermostat.
- Compare with desired temperature settings.
- Make adjustments if values are outside range.
- Confirm changes are registered on the display.
- Inspect the display for clarity.
- Clean the screen gently with a soft cloth.
- Check for any signs of damage or malfunction.
- Replace the thermostat if display issues persist.
- Review the current programming settings.
- Test scheduled changes for proper execution.
- Make adjustments as needed for accuracy.
- Document any changes made to settings.
- Check the display for error codes.
- Refer to the user manual for code meanings.
- Address any faults as per guidelines.
- Reset the system if necessary after resolution.
- Dust the exterior of the thermostat.
- Remove any obstructions around the unit.
- Ensure airflow is not restricted.
- Use a mild cleaner for tough stains.
- Verify that remote sensors are securely mounted.
- Check sensor alignment with the thermostat.
- Test sensor operation for accuracy.
- Adjust positioning for optimal performance.
- Check battery status indicator on the thermostat.
- Use a multimeter to test battery voltage.
- Replace with manufacturer-recommended battery type.
- Dispose of old batteries properly.
- Locate the manufacturer's manual.
- Review maintenance guidelines thoroughly.
- Follow any additional steps provided.
- Document any manufacturer-specific requirements.
Overall Operation Check
- Power on the unit using the main switch.
- Watch for any warning lights or error codes.
- Check for smooth startup without any hesitation.
- Observe the unit for any signs of vibration or instability.
- Use a thermometer to measure inlet and outlet temperatures.
- Check that temperatures are within specified limits.
- Use an anemometer to measure airflow at vents.
- Ensure airflow matches the specifications for the unit.
- Stand near the unit and listen carefully.
- Identify any rattling, grinding, or humming noises.
- Compare sounds to normal operational sounds.
- Document any irregular sounds for further inspection.
- Activate the unit and note the startup time.
- Turn off the unit and observe the shutdown time.
- Ensure there are no delays longer than specified.
- Look for any abnormal behavior during start/stop cycles.
- Inspect air vents for proper orientation.
- Use tissue or light material to observe airflow direction.
- Check that all vents are open and unobstructed.
- Ensure even temperature distribution across the room.
- Locate the condensate drain line.
- Check for any blockages or debris in the line.
- Verify that water is flowing freely during operation.
- Ensure the drain pan is not overflowing.
- Use a pressure gauge to check system pressure.
- Refer to manufacturer specifications for normal ranges.
- Document any readings outside the normal range.
- Investigate any discrepancies immediately.
- Adjust the thermostat setting and wait for response.
- Monitor temperature change over a set period.
- Ensure the unit responds promptly and accurately.
- Document any delays or inaccuracies in temperature adjustment.
- Check all indicator lights for proper operation.
- Test safety alarms to ensure they sound.
- Verify that no warning indicators are illuminated.
- Document any malfunctioning indicators for repair.
- Listen for consistent fan and blower operation.
- Check for vibrations or wobbling during operation.
- Ensure airflow is strong and consistent.
- Document any irregularities for further assessment.
- Inspect the area around the unit for debris.
- Ensure no furniture or objects block air vents.
- Remove any dust buildup on the unit itself.
- Confirm clear access to the unit for maintenance.
- Inspect all joints and connections while the unit is running.
- Look for water or refrigerant leaks.
- Use a leak detector if necessary.
- Document any leaks found for immediate repair.
- Refer to the manufacturer's noise level specifications.
- Use a decibel meter to measure operational noise.
- Compare readings to manufacturer limits.
- Document any noise levels that exceed specifications.
- Inspect insulation for tears or damage.
- Check for gaps that could lead to energy loss.
- Ensure insulation is correctly fitted around ducts.
- Document any insulation issues for repair or replacement.
Use in Manifestly