Fan Coil Unit (FCU) Internal Structure

📌 Key Components Labeled:

1. Casing (Cabinet) – Outer shell, usually insulated.
2. Intake Grille – Where air enters the unit.
3. Filter – Traps dust/pollen (removable for cleaning).
4. Fan + Motor – Blows air across the coil (axial/centrifugal).
5. Coil – Chilled/hot water flows through to cool/heat air.
6. Drip Pan – Collects condensate (in cooling mode).
7. Drain Line – Removes condensate (sloped for gravity flow).
8. Control Panel – Houses thermostat or BMS connection.

🔧 Optional/Additional Parts (Not Shown in Diagram):

• Valves (2-way/3-way) – Control water flow to the coil.
• Actuators – Automate valve operation.
• Electric Heater – Backup heating element.
• UV Light – For disinfection (hospitals/labs).

💡 How It Works (Simple Flow):

1. Air → Drawn in through the grille & filtered.
2. Fan → Pushes air over the coil (cooled/heated).
3. Coil → Transfers heat/cold between water and air.
4. Condensate → Drips into the pan and drains out.
5. Conditioned Air → Blown back into the room.

⚠️ Pro Tips:

• For Efficiency: Keep coils/filters clean to maintain airflow.
• For Longevity: Check drain pans for mold/blockages.
• For Quiet Operation: Use rubber isolators on ceiling-mounted FCUs.