Fan Coil Unit (FCU) Mounting Details – A Complete Guide

Fan Coil Units (FCUs) can be mounted in different ways depending on the unit type, space constraints, and HVAC system design. Below are the key mounting methods, clearances, and installation best practices for FCUs.

1. Types of FCU Mounting

FCUs are available in different configurations, each requiring specific mounting approaches:

A. Ceiling-Mounted (Horizontal FCU)

• Installed in false ceilings or suspended.
• Common in offices, hotels, and commercial buildings.
• Requires minimum 300–500mm ceiling plenum space.

✅ Installation Steps:

1. Secure mounting brackets to the ceiling structure.
2. Ensure proper slope (1–2°) for condensate drainage.
3. Connect ductwork (if used) for air distribution.
4. Provide access panels for maintenance.

⚠ Key Considerations:

• Avoid obstructions (beams, pipes).
• Ensure vibration isolation (rubber pads or springs).

B. Floor-Mounted (Vertical FCU)

• Stands upright against a wall or inside a cabinet.
• Used in apartments, hotels, and retrofit projects.

✅ Installation Steps:

1. Place on a level, sturdy floor (avoid carpet).
2. Allow 200–300mm clearance for airflow & servicing.
3. Connect water pipes & drain line with proper slope.

⚠ Key Considerations:

• Protect from water leaks (drain pan must slope correctly).
• Noise reduction: Use flexible connectors for pipes.

C. Cassette FCU (Ceiling-Recessed)

• Fits into suspended ceilings (like AC cassettes).
• Common in retail stores, restaurants, and offices.

✅ Installation Steps:

1. Cut ceiling opening to match unit dimensions.
2. Secure with suspension rods or brackets.
3. Ensure balanced airflow (4-way or 2-way models).

⚠ Key Considerations:

• Check ceiling load capacity (weight support).
• Provide electrical & water access.

D. Concealed FCU (Chassis-Only Mounting)

• Hidden inside ceilings, cabinets, or custom enclosures.
• Used in luxury homes, hospitals, and hotels.

✅ Installation Steps:

1. Install chassis in a ventilated enclosure.
2. Connect ducts for supply & return air.
3. Ensure easy access for filter cleaning.

⚠ Key Considerations:

• Must have maintenance access panels.
• Avoid restricted airflow (proper duct sizing).

2. General FCU Mounting Requirements

✔ Clearances & Space Needed

✔ Pipe & Drain Connections

• Chilled water pipes: Insulated to prevent condensation.
• Drain line: Must have a 1–2% slope for proper flow.
• Flexible hoses: Reduce vibration transmission.

✔ Electrical Wiring

• Follow local electrical codes.
• Ensure proper earthing/grounding.
• Use safety disconnects near the unit.

3. Common FCU Mounting Mistakes to Avoid

❌ Insufficient clearance → Poor airflow & overheating.
❌ Improper drainage slope → Water leakage.
❌ No vibration isolation → Noise issues.
❌ Blocked access panels → Difficult maintenance.

Final Recommendation

Always consult the manufacturer’s installation manual for exact specs.

For offices/hotels: Ceiling-mounted or cassette FCUs.

For apartments/homes: Floor-mounted or concealed FCUs.