As a terminal device in central air conditioning systems, the maintenance of fan coil units directly affects indoor comfort, energy efficiency, and lifespan.As a crucial terminal device in a central air conditioning system, the maintenance of fan coil units directly affects the system's operating efficiency, energy consumption, and lifespan. The following is a detailed introduction to the maintenance of fan coil units.
Air Filter
Cleaning Frequency: Every 1-3 months; if the environment is dusty or it is a cabinet-type unit (handling fresh air), it is recommended to clean it every 1-2 months.
Cleaning Method: First, clean with a vacuum cleaner. For stubborn wet and sticky dust, remove the filter, rinse with pressurized water, dry, and then reinstall.
Drip Tray
Cleaning Frequency: At least twice a year; for seasonal air conditioners, clean once after use.
Operating Points: After rinsing with water, scrub with disinfectant such as bleach to prevent the growth of bacteria and insects.
Coil (Surface Cooler) Fins
Cleaning Frequency: Once a year
Method: Use a soft brush to clean dust along the direction of the fins; for heavy dust accumulation, spray with a central air conditioning cleaner, let stand for 5 minutes, then rinse with low-pressure water (≤0.3MPa).
Fan Impeller
Cleaning Frequency: Once a year or after each cooling/heating season
Note: Due to the volute casing, it is usually cleaned with a small, powerful vacuum cleaner. Avoid disassembly as this may cause imbalance.
Motor and Bearings
Lubrication: For oil cup bearings, add lubricating oil every six months; for non-oil cup bearings, open the end cover and inject an appropriate amount of oil.
Insulation Testing: Measure the motor's insulation resistance annually using a 500V megohmmeter. It should be ≥0.5MΩ; otherwise, maintenance is required.
Valves and Piping
Check that electric/manual valves operate smoothly and without leaks; periodically test condensate drain pipes to ensure proper drainage.
If the system is to be out of service for an extended period (especially in winter), the coils should be filled with water to prevent rust; in environments without heating, the coils should be drained to prevent freezing.
