Cassette Fan Coil Units (FCU) – Dedicated Zone Cooling Units

The insulated cassette body sits above the ceiling, while a slim decorative panel with a return grille and louvers fits flush with the ceiling below.

The chilled water coil cassette FCU section uses copper tubes and aluminium fins. It is designed to deliver the rated cooling at the building's chilled water conditions.

A centrifugal turbo fan provides strong, even airflow in all discharge directions. It is driven by either a standard AC motor or an energy-saving EC motor.

A washable cassette FCU air filter behind the return grille traps dust and protects the coil, improving indoor air quality.

An insulated drain pan collects condensate, and a condensate pump lifts it to the drain line. A cassette FCU with built in drain pump makes installation more flexible.

A two-way, three-way, or PICV valve with an actuator controls chilled water flow based on the thermostat signal.

A wired thermostat, remote control, or BMS-connected cassette fan coil controller manages temperature, fan speed, and operating modes.

A 4-way cassette fan coil unit discharges air in four directions for uniform cooling of square and open spaces. It is the most popular choice for offices, lobbies, and showrooms. Some models offer round flow or 360 degree discharge for even smoother air distribution.

2-way cassette FCUs discharge air in two opposite directions, making them ideal for corridors, rectangular rooms, and spaces along long walls. For very narrow spaces, one-way cassette units are also available.

Compact cassette FCUs fit directly into a standard 600 x 600 mm ceiling grid, replacing a single ceiling tile. They suit cabins, small meeting rooms, and clinics.

A 2 pipe cassette fan coil unit has one supply and one return connection. It is the most common choice in India for cooling-only applications.

A 4 pipe cassette fan coil unit has separate chilled water and hot water circuits, allowing each zone to cool or heat at any time. It is used in hospitals, premium hotels, and cooler climates.

When comparing 2 pipe cassette FCU vs 4 pipe cassette FCU, 2-pipe units are simpler and more economical for cooling-only needs, while 4-pipe units offer year-round flexibility.

AC motor units use standard multi-speed motors, while EC motor units use electronically commutated motors that save significant energy and offer smooth, quiet speed control.

Many cassette FCUs include a knock-out for a fresh air duct connection, allowing treated fresh air to be introduced directly through the unit.

Chilled water cassette FCUs are commonly available from about 1 TR to 4 TR, with airflow of roughly 400 to 1,200 CFM. Compact 600 x 600 units cover the lower end of this range. Exact capacities vary by brand and model.

Cassette FCU sizing depends on floor area, ceiling height, occupancy, glass exposure, lighting, and equipment load. Compress India carries out heat load calculations to ensure accurate cassette FCU selection and cooling capacity for every zone.

Actual cassette FCU cooling capacity depends on chilled water supply and return temperatures. Coil rows and circuiting are selected to match your building's chilled water design.

Cassette FCU airflow and noise vary with fan speed. For offices, conference rooms, and hotel spaces, a low noise cassette FCU is selected to meet the load comfortably on medium speed.

Cassette FCUs need enough ceiling void for the unit body, pipe connections, and drain routing. Depending on the model, this is typically around 300 mm to 400 mm. Our team verifies site conditions before selection.

The false ceiling must have a correctly sized cut-out for the unit. Compact models fit a standard grid tile, while larger units need a framed opening coordinated with the ceiling contractor.

The unit is hung from the slab using anchor fasteners and threaded support rods, independent of the false ceiling, which cannot carry its weight.

An access panel near the unit allows technicians to reach the valve kit, strainer, and drain connections for servicing.

A 2 way valve cassette FCU setup opens and closes chilled water flow based on the thermostat, supporting variable flow systems and saving pump energy.

Three-way valves bypass water around the coil when cooling is not needed. They keep system flow constant but offer lower energy savings.

A PICV for cassette FCU combines balancing and control in one valve, delivering stable flow regardless of pressure changes. A cassette FCU with PICV offers better temperature control and simpler commissioning.

A cassette FCU balancing valve sets the design flow for each unit, while strainers protect the coil and valve from debris.

Wall thermostats provide accurate temperature sensing and easy control of setpoint and fan speed.

A cassette FCU remote control offers convenient operation for meeting rooms, cabins, and hotel spaces.

Occupants can select a fan speed manually or use auto mode, where the controller adjusts speed based on room load.

A cassette FCU with BMS integration enables central monitoring, scheduling, setpoint limits, and fault alarms across the building.

Occupancy sensors or schedules set back temperatures in empty rooms, saving energy in meeting rooms, classrooms, and banquet areas.

EC motors consume significantly less power, especially at low and medium speeds, where cassette FCUs run most of the time.

Two-way valves and PICVs enable variable flow chilled water systems, reducing pumping energy and improving chiller efficiency.

Setpoint limits, time schedules, and occupancy control prevent overcooling. Together, these features make an energy efficient cassette FCU system.

4-way airflow FCUs spread cool air evenly across the room, eliminating hot and cold spots.

Each cassette FCU has its own controls, so every zone can be set to its preferred comfort level.

Unlike a ceiling mounted AC unit with a condenser, a cassette FCU needs no outdoor unit, keeping the facade clean.

Chilled water piping replaces refrigerant piping inside occupied spaces, reducing refrigerant-related risks.

Only a slim panel is visible, giving interiors a clean, modern look.

With the unit in the ceiling, walls and floors stay free for furniture, displays, and interiors.

A central chiller supplying multiple cassette FCUs is more efficient than many individual DX units.

Cassette FCUs need a chiller plant or district cooling supply to operate.

A cassette cannot be installed without a false ceiling. For rooms without one, a hi wall FCU is a better fit.

The built-in drain pump needs regular cleaning and checks to prevent failure and water leakage.

Poor insulation, drain faults, or pump failure can cause water to drip onto the ceiling. Correct installation and maintenance prevent this.

Cassette FCUs recirculate room air unless a fresh air duct or a separate treated fresh air system is provided.

Compress India plans ceiling, drainage, and fresh air provisions from the start, so these limitations are managed before they become site issues.

A cassette FCU for offices provides uniform cooling for open workspaces, meeting rooms, and conference halls, with individual zone control.

A cassette FCU for hotels delivers even cooling across lobbies, restaurants, and banquet areas with a clean ceiling finish.

Hospitals use cassette FCUs in OPDs, waiting areas, wards, and clinics for quiet, hygienic zone cooling, with fresh air supplied separately.

Cassette FCUs keep showroom walls free for displays while providing uniform cooling across the sales floor.

Bank branches use cassette FCUs for quiet, even cooling in customer areas and cabins.

Classrooms, libraries, and staff rooms benefit from cassette FCUs with schedule and occupancy-based control.

Waiting lounges, offices, and service areas use cassette FCUs for zone cooling within large central chilled water systems. As a cassette FCU for commercial buildings, it scales easily across large facilities.

Blue Star is a well-known Indian HVAC brand offering chilled water cassette fan coil units for commercial and hospitality projects.

Voltas offers cassette FCUs as part of its central air conditioning range for commercial buildings.

Daikin offers ceiling cassette units for chilled water applications across offices, hotels, and retail spaces.

Carrier provides cassette fan coil units for chilled water systems in commercial and hospitality buildings.

Trane offers cassette FCUs designed for commercial and institutional buildings with central chilled water plants.

Johnson Controls, through its York range, offers cassette FCUs for central chilled water systems.

Several other cassette FCU manufacturers and specialised suppliers offer quality units. Compress India recommends the most suitable brand and model based on capacity, noise levels, controls, and service support.

Filters should typically be cleaned every two to four weeks, depending on dust levels and usage.

Periodic coil and fan cleaning restores cooling performance, reduces noise, and prevents odours.

The drain pump, float switch, drain pan, and drain line are cleaned and tested to prevent overflow and ceiling leaks.

Control valves and actuators are checked for correct operation, leaks, and response to thermostat signals.

• Comprehensive AMC: Covers scheduled maintenance plus specified spare parts, with predictable annual costs.
• Non-Comprehensive AMC: Covers scheduled maintenance and service visits, with spare parts charged separately.

Causes: blocked drain, failed drain pump, poor pipe insulation, or incorrect levelling.

Solution: Clean the drain and pump, repair insulation, and re-level the unit.

Causes: dirt or sludge in the pump, float switch fault, or motor failure.

Solution: Clean or replace the pump and float switch, and treat the drain pan regularly.

Causes: closed or stuck valve, air in the coil, dirty filter or coil, or low chilled water supply.

Solution: Check the valve, vent air, clean the filter and coil, and verify chilled water flow and temperature.

Causes: damaged insulation, gaps in the vapour barrier, or air leaks around the panel.

Solution: Re-insulate pipes and valves, seal joints, and reseat the panel properly.

Causes: dirty fan, worn bearings, loose panel, or high fan speed.

Solution: Clean the fan, replace bearings, tighten parts, and adjust speed settings.

Causes: stagnant water in the drain pan, dirty coil, or microbial growth.

Solution: Clean and sanitize the coil, pan, and drain line, and maintain a regular cleaning schedule.

Causes: dirt in the valve, actuator motor failure, or wiring faults.

Solution: Clean or replace the valve and repair or replace the actuator.

Ageing, noisy, or inefficient cassette FCUs can be replaced with modern units that deliver better cooling, lower noise, and lower energy use.

Switching to EC motor cassette FCUs cuts fan energy significantly and provides quieter operation.

Upgrading to PICVs and smart or BMS-connected thermostats improves temperature stability and energy savings.

Buildings with many DX false ceiling cassette ACs can move to a central chiller with chilled water cassette FCUs. This removes outdoor units, reduces refrigerant use, and lowers long-term running costs.

Higher capacity and 4-way units generally cost more than compact or 2-way units. EC motor models are priced higher than standard motor units but save energy over their life.

Valve kits, PICVs, thermostats, chilled water piping, insulation, drain piping, ceiling coordination, and electrical work form a significant part of the total installed cost.

Brand, 2-pipe or 4-pipe configuration, 2-way or 4-way discharge, motor type, drain pump, valve type, BMS integration, and site conditions all affect the final price.

Share your area details and ceiling layout with Compress India to receive an accurate cassette FCU quotation.