I. General Maintenance and Care Contents
(1) Environmental cleaning and maintenance
Regularly clean the dust and debris around the equipment and in the installation area to prevent the accumulation of pollutants that may affect the air intake efficiency or be sucked into the equipment.
Keep the floor, walls and ceiling of the clean room clean to reduce the content of environmental particulate matter and lower the load on the filters.
Do not place any obstacles near the equipment’s air outlet to ensure smooth air flow and avoid local air flow disorder.
(II) Filter Maintenance
Regular inspection
Regularly observe whether there is obvious dust accumulation, damage or air leakage on the surface of the filter (the cleanliness test data can be used to assist in judgment. If the cleanliness suddenly drops, the filter should be inspected as a priority).
For high-efficiency filters (HEPA/ULPA), regularly test their pressure difference (initial resistance and final resistance). When the pressure difference reaches 1.2 to 1.5 times the final resistance, they need to be replaced in a timely manner.
Replacement specification
When replacing, the operation should be carried out in a clean environment to prevent the new filter from being contaminated. Disassemble and install strictly in accordance with the steps in the equipment manual to ensure good sealing (sealant or sealing strips can be used to enhance the sealing).
The replaced waste filters should be packaged in accordance with the hazardous waste treatment standards to prevent the spread of pollutants.
(3) Air flow and cleanliness monitoring
Regularly use an anemometer to measure the air velocity at the outlet to ensure it is within the design range (typically, the air velocity for laminar flow devices is 0.2-0.5m/s, subject to the equipment parameters). If the air velocity is abnormal, the cause should be investigated (such as filter blockage, fan failure, etc.).
Conduct cleanliness tests (such as particle counter tests) at the prescribed intervals to verify the purification effect of the equipment. If the test results do not meet the standards, timely troubleshooting and maintenance should be carried out.
Ii. Specialized Maintenance and upkeep for laminar flow devices (integrated type)
(1) Maintenance and support for centralized air supply systems
Fan and motor maintenance
Regularly inspect the operating status of the centralized fan, including whether the vibration and noise are abnormal and whether the motor temperature is too high (generally not exceeding 80℃).
Add lubricating oil (or replace grease) to the motor bearings according to the equipment manual cycle to avoid dry grinding damage.
Regularly inspect the tension and wear of the fan belt (if it is belt drive). Adjust it in time when the tension is insufficient and replace it when the wear is severe.
Maintenance of air ducts and static pressure boxes
Regularly clean the accumulated dust inside the air ducts to prevent it from falling off and contaminating the filters or affecting the uniformity of the airflow. The cleaning cycle can be adjusted according to the cleanliness of the environment (generally once every 6 to 12 months).
Check the sealing performance of the air ducts and the static pressure box. If there is any air leakage, it should be repaired with sealing materials to prevent non-purified air from seeping in.
Maintenance of air valves and control systems
Regularly check the flexibility of the air valve’s opening and closing and its sealing performance to ensure that the air volume regulation function is normal and avoid air flow imbalance caused by air valve jamming.
Maintain the sensors of the control system (such as differential pressure sensors and wind speed sensors), calibrate them regularly to ensure the accuracy of data detection and guarantee the stability of the system’s automatic regulation function.
(2) Maintenance of structure and installation parts
Check the connection parts between the laminar flow device and the ceiling and walls. If there is any looseness or seal failure, tighten the bolts in time and replenish the sealing materials to prevent short circuit of the airflow.
Clean the accumulated dust on the air outlet diffuser plate to avoid blocking the air flow channel. You can use compressed air (clean and dry) for blowing or wipe with a damp cloth (dry after wiping).
Iii. Specialized Maintenance and Care for FFU Laminar Flow Units
(1) Maintenance of built-in fans and motors
Regularly observe the noise and vibration during the operation of the FFU. If any abnormalities occur (such as a sudden increase in noise or obvious vibration), stop the machine to check whether the fan impeller is dusty, unbalanced or the bearings are worn. Clean the dust on the impeller or replace the bearings in time.
Regularly check the operating current and temperature of the motor to ensure they are within the rated range and avoid overload operation.
For FFUs with speed regulation functions, regularly test the stability of the speed regulation module to ensure normal switching between different wind speed gears.
(2) Maintenance of modular components
Box body and interface maintenance
Check the sealing performance of the FFU box. If there are any gaps, repair them with sealant to prevent unfiltered air from entering through the gaps.
When multiple FFUs are used in combination, check the connection points between the units to ensure that the airflow is not disturbed. If necessary, adjust the installation position or add a deflector device.
Electrical system maintenance
Regularly check the connection status of power cords, plugs and terminal blocks to prevent loose or oxidized parts from causing poor contact. Replace them in time if any damage is found.
Clean the dust inside the electrical control box to prevent short circuits or component failures. When maintaining, cut off the power supply first to ensure safety.
(3) Independent monitoring and fault handling
For FFUs with status displays, regularly check the consistency between the displayed data (such as wind speed and running time) and the actual detection results, and calibrate or repair the monitoring module in a timely manner.
Establish a single FFU maintenance file, recording the operating time of each device, the filter replacement cycle, fault conditions, etc., to facilitate precise maintenance.
When a single FFU malfunctions, it can be shut down for maintenance independently without affecting the operation of other units. After maintenance, its cleanliness and wind speed need to be tested. Only after meeting the standards can it be put back into use.
Iv. Precautions for Maintenance and Care
All maintenance operations must be carried out after the machine has been shut down and the power supply has been cut off. When it comes to the maintenance of electrical components, it should be performed by professional electricians to avoid the risk of electric shock.
During the maintenance process, protective equipment such as clean suits and gloves must be worn to avoid the introduction of contaminants by humans.
Strictly follow the maintenance manual provided by the equipment manufacturer, operate in accordance with the prescribed cycle and methods, and do not change the maintenance parameters or disassemble the core components without authorization.
Establish a regular maintenance plan (such as daily inspection once a day, filter differential pressure detection once a week, and comprehensive maintenance once every 3 to 6 months), and adjust the cycle according to the actual usage environment and equipment operation status.
The consumables to be replaced (such as filters, bearings, and lubricating oil) should be of models that match the equipment to ensure that the performance of the equipment is not affected.
(1) Environmental cleaning and maintenance
Regularly clean the dust and debris around the equipment and in the installation area to prevent the accumulation of pollutants that may affect the air intake efficiency or be sucked into the equipment.
Keep the floor, walls and ceiling of the clean room clean to reduce the content of environmental particulate matter and lower the load on the filters.
Do not place any obstacles near the equipment’s air outlet to ensure smooth air flow and avoid local air flow disorder.
(II) Filter Maintenance
Regular inspection
Regularly observe whether there is obvious dust accumulation, damage or air leakage on the surface of the filter (the cleanliness test data can be used to assist in judgment. If the cleanliness suddenly drops, the filter should be inspected as a priority).
For high-efficiency filters (HEPA/ULPA), regularly test their pressure difference (initial resistance and final resistance). When the pressure difference reaches 1.2 to 1.5 times the final resistance, they need to be replaced in a timely manner.
Replacement specification
When replacing, the operation should be carried out in a clean environment to prevent the new filter from being contaminated. Disassemble and install strictly in accordance with the steps in the equipment manual to ensure good sealing (sealant or sealing strips can be used to enhance the sealing).
The replaced waste filters should be packaged in accordance with the hazardous waste treatment standards to prevent the spread of pollutants.
(3) Air flow and cleanliness monitoring
Regularly use an anemometer to measure the air velocity at the outlet to ensure it is within the design range (typically, the air velocity for laminar flow devices is 0.2-0.5m/s, subject to the equipment parameters). If the air velocity is abnormal, the cause should be investigated (such as filter blockage, fan failure, etc.).
Conduct cleanliness tests (such as particle counter tests) at the prescribed intervals to verify the purification effect of the equipment. If the test results do not meet the standards, timely troubleshooting and maintenance should be carried out.
Ii. Specialized Maintenance and upkeep for laminar flow devices (integrated type)
(1) Maintenance and support for centralized air supply systems
Fan and motor maintenance
Regularly inspect the operating status of the centralized fan, including whether the vibration and noise are abnormal and whether the motor temperature is too high (generally not exceeding 80℃).
Add lubricating oil (or replace grease) to the motor bearings according to the equipment manual cycle to avoid dry grinding damage.
Regularly inspect the tension and wear of the fan belt (if it is belt drive). Adjust it in time when the tension is insufficient and replace it when the wear is severe.
Maintenance of air ducts and static pressure boxes
Regularly clean the accumulated dust inside the air ducts to prevent it from falling off and contaminating the filters or affecting the uniformity of the airflow. The cleaning cycle can be adjusted according to the cleanliness of the environment (generally once every 6 to 12 months).
Check the sealing performance of the air ducts and the static pressure box. If there is any air leakage, it should be repaired with sealing materials to prevent non-purified air from seeping in.
Maintenance of air valves and control systems
Regularly check the flexibility of the air valve’s opening and closing and its sealing performance to ensure that the air volume regulation function is normal and avoid air flow imbalance caused by air valve jamming.
Maintain the sensors of the control system (such as differential pressure sensors and wind speed sensors), calibrate them regularly to ensure the accuracy of data detection and guarantee the stability of the system’s automatic regulation function.
(2) Maintenance of structure and installation parts
Check the connection parts between the laminar flow device and the ceiling and walls. If there is any looseness or seal failure, tighten the bolts in time and replenish the sealing materials to prevent short circuit of the airflow.
Clean the accumulated dust on the air outlet diffuser plate to avoid blocking the air flow channel. You can use compressed air (clean and dry) for blowing or wipe with a damp cloth (dry after wiping).
Iii. Specialized Maintenance and Care for FFU Laminar Flow Units
(1) Maintenance of built-in fans and motors
Regularly observe the noise and vibration during the operation of the FFU. If any abnormalities occur (such as a sudden increase in noise or obvious vibration), stop the machine to check whether the fan impeller is dusty, unbalanced or the bearings are worn. Clean the dust on the impeller or replace the bearings in time.
Regularly check the operating current and temperature of the motor to ensure they are within the rated range and avoid overload operation.
For FFUs with speed regulation functions, regularly test the stability of the speed regulation module to ensure normal switching between different wind speed gears.
(2) Maintenance of modular components
Box body and interface maintenance
Check the sealing performance of the FFU box. If there are any gaps, repair them with sealant to prevent unfiltered air from entering through the gaps.
When multiple FFUs are used in combination, check the connection points between the units to ensure that the airflow is not disturbed. If necessary, adjust the installation position or add a deflector device.
Electrical system maintenance
Regularly check the connection status of power cords, plugs and terminal blocks to prevent loose or oxidized parts from causing poor contact. Replace them in time if any damage is found.
Clean the dust inside the electrical control box to prevent short circuits or component failures. When maintaining, cut off the power supply first to ensure safety.
(3) Independent monitoring and fault handling
For FFUs with status displays, regularly check the consistency between the displayed data (such as wind speed and running time) and the actual detection results, and calibrate or repair the monitoring module in a timely manner.
Establish a single FFU maintenance file, recording the operating time of each device, the filter replacement cycle, fault conditions, etc., to facilitate precise maintenance.
When a single FFU malfunctions, it can be shut down for maintenance independently without affecting the operation of other units. After maintenance, its cleanliness and wind speed need to be tested. Only after meeting the standards can it be put back into use.
Iv. Precautions for Maintenance and Care
All maintenance operations must be carried out after the machine has been shut down and the power supply has been cut off. When it comes to the maintenance of electrical components, it should be performed by professional electricians to avoid the risk of electric shock.
During the maintenance process, protective equipment such as clean suits and gloves must be worn to avoid the introduction of contaminants by humans.
Strictly follow the maintenance manual provided by the equipment manufacturer, operate in accordance with the prescribed cycle and methods, and do not change the maintenance parameters or disassemble the core components without authorization.
Establish a regular maintenance plan (such as daily inspection once a day, filter differential pressure detection once a week, and comprehensive maintenance once every 3 to 6 months), and adjust the cycle according to the actual usage environment and equipment operation status.
The consumables to be replaced (such as filters, bearings, and lubricating oil) should be of models that match the equipment to ensure that the performance of the equipment is not affected.
