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

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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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