To pay attention to these seventeen points when installing and using fan coil units


Precautions for fan coils installation

Whether you install your fan coil unit and its system yourself or have it installed by a professional, there are some common issues you need to know so you can avoid them or detect them quickly.

indoor fan coils
  1. Indoor Fan Coils Installation:
    • The indoor fan coils should be installed horizontally.
    • Use Φ10mm suspension rods for installation, ensuring they are rust-resistant.
    • Securely fasten the suspension rods to the fixed nuts on the indoor unit.
  2. Proper Positioning:
    • The installation position should align with indoor air circulation and comply with the design drawings.
    • Maintain a certain distance between the fan coil and the floor slab.
  3. Water Pressure Test:
    • Conduct a water pressure test at 0.6 MPa for 2 hours without any leaks.
  4. Insulation Requirements:
    • Insulate the piping: Use a 20mm thick insulation layer.
    • Insulate the condensate water piping: Apply a 10mm thick insulation layer.
    • Secure the insulation material using U-shaped clips or other suitable methods, ensuring minimal compression (2-3 mm).
  5. Condensate Drainage:
    • Maintain a proper slope for condensate drainage.
    • For naturally draining fan coils, ensure the drainage outlet slope is not less than 1%.
    • Conduct leak-free tests during both full water and drainage tests.
  6. Ceiling Height Considerations:
    • Avoid using ceiling-type units when the ceiling height exceeds 3 meters.
    • High ceilings may hinder warm air circulation and affect heating efficiency.
  7. Flexible Connections:
    • Use flexible hoses to connect the condensate water piping to the unit.
    • Rigid connections may lead to water pipe detachment, leaks, and noise due to vibrations during unit operation.
  8. Airflow Organization:
    • Arrange indoor airflow to prevent short-circuiting or disruption.
    • Short-circuiting occurs when air from the supply outlet returns directly to the unit without reaching the occupied area.
    • Disruption occurs when return air is not within the same air-conditioned zone or fails to reach the designated area, affecting cooling and heating efficiency.
  9. Return Air Box Installation:
    • Install a return air box for fan coils.
    • Without a return air box, effective indoor air circulation is compromised, leading to poor cooling and heating performance.
  10. Duct Sizing and Material:
    • Ensure supply and return air ducts meet specifications.
    • Undersized ducts can result in excessive air velocity or insufficient airflow, causing noise and suboptimal cooling/heating.
    • Determine outlet and return sizes based on recommended air velocities (e.g., outlet ≤ 2 m/s, return ≤ 1.5 m/s).
  11. Flexible Duct Connections:
    • Use canvas or other flexible materials to connect ducts and supply outlets.
    • Rigid connections transmit vibrations from the unit, leading to noise and potential issues.
  12. Stainless Steel Flexible Connectors:
    • Use stainless steel flexible connectors for fan coils connections.
    • Prevents vibration transfer from the unit to the water pipes, reducing noise and preventing pipe detachment or leaks.
  13. Horizontal Alignment:
    • Ensure that the flexible connectors connecting fan coils and water pipes are installed horizontally without excessive bending.
    • Overly bent connectors may rupture and leak.
  14. Water Filtration:
    • Install a “Y”-shaped filter on the water inlet pipe to prevent impurities and debris from damaging or clogging the heat exchanger.
  15. Energy-Efficient Valve Installation:
    • When installing electric two-way valves for energy efficiency, place them on the return water pipe.
    • Ensure normal water flow rates required by the fan coil.
  16. Grounding and Electrical Specifications:
    • Properly ground the unit to prevent electrical accidents.
    • Use power cables that meet unit requirements to avoid operational issues, cable damage, or fire hazards.
  17. Individual Control Switches:
    • Each control switch should only operate one fan coil; simultaneous control of multiple units is not allowed.
    • Simultaneous control may lead to motor burnout in fan coils.

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