During long-term operation, the functional components of modular air conditioning units are susceptible to the effects of dust, moisture, and corrosion. Lack of systematic maintenance can lead to decreased energy efficiency, deteriorated air quality, and even equipment failure. To ensure stable and efficient operation, a maintenance strategy should be developed at three levels: daily inspection, periodic maintenance, and seasonal maintenance.
Daily inspection is the foundation of maintenance work. Operators need to check the operating parameters displayed on the control panel daily, including supply and return air temperature and humidity, fan current, filter differential pressure, and coil inlet and outlet water temperatures. Observe the unit for any abnormal vibrations or noises, and check whether the fresh air and return air valve positions are consistent with the set modes. When the filter differential pressure approaches the alarm value, prepare to replace or clean the filter media promptly to prevent airflow obstruction, which could cause fan overload and reduced heat exchange efficiency.
Periodic maintenance should be performed monthly or quarterly. Monthly maintenance should include cleaning dust from the fan impeller surface, checking bearing lubrication and replenishing grease; inspecting the surface cooler and heater coil fins for blockages or corrosion, and flushing and anti-corrosion treatment as necessary. The condensate drainage system must be kept clear to prevent water accumulation, bacterial growth, and odor generation. For the humidification section, water quality and electrode status should be tested regularly, scale removed, and humidification efficiency ensured. Electrical system terminals should be securely tightened, insulation resistance checked, and measures taken to prevent poor contact or leakage.
Seasonal maintenance is crucial for addressing environmental changes. Before summer, a comprehensive inspection of the refrigeration system, including chilled water pumps, valves, and piping insulation, should be conducted to ensure no leaks and to test cooling performance. Before winter operation, the heating section must be confirmed to be functioning correctly, and the preheating system should be able to start promptly to prevent coil freezing and cracking. A complete shutdown and overhaul can be scheduled during transitional seasons to disassemble and clean internal air ducts and heat exchangers, check the aging of vibration damping devices and flexible joints, and replace damaged parts promptly.
During maintenance, detailed records should be maintained, documenting the time, content, and problems found for each inspection, maintenance, and repair, creating an equipment health record. Historical data analysis can predict the replacement cycle of vulnerable parts, optimizing spare parts reserves and maintenance plans. Simultaneously, regular training should be provided to operators and maintenance personnel to familiarize them with the unit's structural principles and emergency response procedures, improving fault response speed.
A scientific maintenance system not only extends the service life of modular air conditioning units but also maintains air handling performance and system energy efficiency, reducing operating costs. With increasingly stringent energy conservation and environmental protection requirements, institutionalizing and standardizing maintenance work is an inevitable choice to ensure indoor environmental quality and reliable equipment operation.
