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If you manage a building with a central chiller plant, fan coil units are probably doing the final delivery work in most of your rooms. They are simple devices—a coil, a fan, a filter, and a drain pan—but the difference between a well-matched unit and a poorly chosen one shows up in tenant complaints and electricity bills.
Here is what actually matters when specifying a chilled water fan coil unit.
Match the coil to your water temperature, not just the catalog
A chilled water coil’s capacity depends heavily on the entering water temperature and flow rate. Many catalogs list nominal capacities at 7°C supply water, but if your plant runs warmer—say 10–12°C for efficiency—the same coil will deliver less cooling. Check the performance table at your actual design conditions. Also confirm the coil face velocity stays below roughly 2.5 m/s (500 fpm) for dehumidifying applications, or you risk condensate carryover into the ductwork .
Decide between 2-pipe and 4-pipe before you order
A 2-pipe unit shares one coil for chilled and hot water, which means seasonal changeover. A 4-pipe unit has separate coils and can heat and cool simultaneously. If your building has perimeter zones that need morning heat while interior zones still need cooling, 4-pipe is the practical choice. In many Asian markets, fan coil units paired with a dedicated outdoor air system are the standard configuration because the DOAS handles ventilation and latent load while the fan coil manages sensible load .
Do not ignore the fan curve and static pressure
The fan has to push air through the coil, filter, and any ductwork. If you select a unit with insufficient external static pressure, airflow drops, the coil gets colder than design, and you may get coil freezing or nuisance low-limit trips. Ask for the fan curve at your required static pressure, not just free-air CFM.
Plan for maintenance access
Fan coil units sit above ceilings or in closets. A unit with a hinged filter panel and a drain pan you can slide out saves hours of labor over its life. Check that the filter is accessible without removing the entire unit, and that the drain pan slopes properly toward the drain connection. Mold growth in air handling systems is often traced to standing water and inaccessible coils .
What to put in your inquiry
When you contact a supplier, send these five numbers: required cooling capacity (kW), entering/leaving chilled water temperature, design airflow (CFM or m3/h), available external static pressure, and your power supply (voltage/phase). With those, a good supplier can propose a unit that actually works, rather than one that just looks good on a spec sheet.
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