Home / Heat Pump Blog / Industry Blog / Industry Blog / Everything You Need to Know About Fan Coil Units

Everything You Need to Know About Fan Coil Units

Views: 140     Author: Site Editor     Publish Time: 2023-11-30      Origin: Site

Fan Coil Units

The desire for indoor heating or cooling is always present regardless of the season, making us think outside the box and go beyond traditional methods such as burning fuels or using electrical heaters. Due to environmental concerns raising alarms globally mirroring those of nature, eco-friendly alternatives like heat pumps have become more popular as they help reduce our carbon footprint.

Nevertheless, the quest for sustainability transcends these gadgets to encompass various HVAC products to enhance environmental sensitivity, efficiency, and energy-saving techniques. Also, the HVAC fan coil unit is a notable player in this industry.

What Is a Fan Coil Unit?

An HVAC fan coil unit has changed the room or area temperature regulation method forever, eliminating the need for conventional ductwork. Its main components include a heat exchange coil, a fan that enables air to circulate well, and integrated control systems that monitor temperature and airflow. There are two main types of FCUs – VFCs (Vertical Fan Coil Units) and HFCs (Horizontal Fan Coil Units), each having different orientations.

In the quest for a greener and more sustainable way of feeling comfortable in our homes, realizing the potential of FCUs is significant. The units have massive heating and cooling capabilities and are part of a wider agenda on energy consumption and ecologically friendly living.

Elements of a Fan Coil Unit System

A Fan Coil Unit (FCU) system compiles different HVAC mechanisms pertaining to temperature manipulation and airflow management in different environments. It has several significant components that complement proper heating in addition to cooling.

Indoor Coil (Water Coil or Heat Exchanger): The water coil or heat exchanger is a critical component of an AC fan coil. It performs the mission-critical role of transferring heat between the refrigerant and air to manage the interior temperature inside the room.

Fan (Centrifugal or Axial): The fan, which falls into two basic types of fans—centrifugal or axial, is one of the essential components in the fan coil AC unit. It is used to circulate the conditioned air throughout the area in which it is designed to be fixed. Centrifugal fans work with higher-pressure systems, while axial fans move large volumes of air at lower pressures.

Outdoor Condensing Unit: It consists of the compressor and condenser coil, which are important to the cooling process. The compressor increases the refrigerant pressure, which the condenser coil removes into the outside air for the refrigeration cycle to be complete.

Coil: The FCU system comprises a coil vital for heat exchange. During cooling, the room air is heated by the coil, which heats air in heating mode. It follows basic laws of thermodynamics, which are mainly conduction and convection.

Thermostat: Operating as an interface between the user and the control unit, the thermostat enables temperature setting. If the temperature goes above or below what was set, the fan coils HVAC will sense this, causing heating or cooling to adjust.

Filter: Dust, particles, and contaminants are caught within air filters, which help maintain indoor air quality. Consequently, this prevents damage to internal components and ensures better health.

How Does a Fan Coil Unit Work?

The science behind FCU systems utilizes fundamental principles of physics, especially thermodynamics laws, which govern processes related to heat transfer, like conduction and convection. Heat absorption occurs through its coil when refrigerant evaporates to cool down during cooling mode.

Concerning practical implications, the FCU system has air and refrigerant movement. In cooling mode, it takes up warmer air from this space and blows it over the coil. Therefore, the refrigerant removes heat from the air, thus cooling it off.

This cool air is then re-circulated into the room, cooling it effectively. However, in heating mode, the reverse process is adopted. Heat is removed from the refrigerant through the coil and transferred to the air, heating it before exhausting it back into the room.

Type of Fan Coil Units

Different fan coil heating system types depend on the specific requirements and installation style. With the hidden fan coil unit, installations are done in ceilings, hence not interfering with the look aspect of the space.

On the other hand, those that are not exposed are installed into walls or floors and often sited to be where looks will not matter as much because accessibility is far more important. High-static fan coil units can be utilized with several ductwork systems that demand great air distribution even over difficult air system spacings. On the other hand, low-static fan coil units seek simple installation and uncomplicated heating and cooling setups.

Benefits of Fan Coil Heating System

The fan coil heating systems are beneficial for various residential and commercial purposes. One of the major advantages this allows is the zoning control, hence promoting energy efficiency.

The users can heat or cool several parts of the room instead of the whole place, minimizing the wastage of energy while providing desired comfort. In addition, fan coil systems have lower installation and maintenance costs than traditional HVAC systems. Their operation is a quiet one catering to serene settings.

Installation and Placement of Fan Coil Units

For the best performance of FCU unit HVACs, they must be properly installed and strategically located. To this end, a licensed technician should install it to achieve proper placement, secure mounting, and seamless integration with the central HVAC system.

Vertical or horizontal installations depend on space availability, airflow considerations, maintenance accessibility, and esthetic preferences. Furthermore, correct positioning enhances efficiency and also complements the beauty of residential or working spaces.

Do Fan Coil Units Use Refrigerant?

Fan coil units use refrigerants to cool or heat. In cooling mode, these refrigerants flow through the coil and absorb heat from the air, while in heating mode, they give out heat. Regular maintenance is important because this will prevent the refrigerant from entering the atmosphere, which may harm the environment and the HVAC system's efficiency.

Fixing potential leaks as soon as possible helps ensure that it continues operating effectively while minimizing its environmental impact.

Maintenance Tips for Fan Coil Units

When maintaining an FCU unit, little preventive care goes a long way toward longevity and efficiency.

One should consider major components so that malfunctions do not happen and everything runs smoothly.

1.Filter Cleaning or Replacement: One of the simplest basic jobs when maintaining an FCU entails cleaning or changing the air filters from time to time. The dust, soil, and other impurities accumulate in the filters, contributing to good indoor air quality. Over time, these filters may block, providing less airflow and, therefore, needing more efficiency in their work. Doing so will always cause an airflow whenever the fan or other system's parts lack strain.

2. Professional Inspections: Technicians are trained to diagnose problems that may not be visible during routine maintenance. Some of these include leakage of refrigerants and breakdown of fan motors. Early observation during this process of expert checking prevents minor hitches from developing into major ones that would impair the whole system.

3. Regular Maintenance Schedules: Proactive care will put the system in a condition that needs little attention. Regular maintenance should comprise routine tasks such as filter cleaning/replacement and more detailed professional inspections. Top coordinated and consistent maintenance may lead to finding and repairing small underlying problems, enhancing the reliability and durability of the system.

Troubleshooting Tips

1.Below Standard Heating or Cooling: Look into the thermostat settings if the FCU isn't heating up enough or cooling down adequately. Check that the thermostat is set to the required temperature and mode. If not, it might be an issue with the fan coil and refrigerant levels, so hire an electrician.

2. Odd Noises: Rattling or squealing noises may indicate the fan motor or mechanical parts problems.  It is therefore important to investigate and identify the cause of the noise as soon as possible to avert further damage.

3. Refrigerant Leaks: If one notices reduced cooling performance, it could be due to refrigerant leakage. The refrigerant levels should be inspected, and any leaks should be repaired in good time for system efficiency and environmental protection.

Contact SPRSUN about the Heat Pump

SPRSUN, a heat pump supplier since 1999, has been tirelessly serving different categories of heat pumps for fan coil units. Trust SPRSUN, the ultimate heat pump wholesale supplier, when you are ready to redefine your home heating or cooling needs. We manufacture heat pumps for global brands, wholesalers, fabricators, and contractors in over 30 countries worldwide. We strive for excellence in providing high-quality solutions for your heating, hot water, or cooling projects. That is where SPRSUN brings together innovation and reliability.


In conclusion, FCU air conditioning systems are indispensable parts of HVAC systems that provide efficient and adaptable heating and cooling services. Homeowners and HVAC practitioners must know the basics of FCUs, including types, benefits, and how to maintain them properly. Proper installation and maintenance are essential to derive maximum energy efficiency from FCUs over the years as they integrate heat pumps with indoor comfort.

Latest News & Articles

Related Heat Pump Articles

  • Why Does My Swimming Pool Heat Pump Freeze Up?


    During the winter season, some ice on your pool heat pump is a common occurrence. However, when the whole unit is covered in ice, there is a concern for worry as your device won't function well and might be at risk of getting damaged.This article focuses on people who want to use their pool heat pum Read More
  • A Complete Guide: Air Source Heat Pump Costs


    Heat pumps have surprisingly become a ‘necessary’ appliance for their ability to offer a convenient and reliable energy source for anyone looking to warm their pools or stay warm indoors. If you want to invest in a heating or cooling unit, heat pumps are undoubtedly a suitable option to suit your ne Read More
  • The Best Air Source Heat Pump Manufacturers of 2022


    Air source heat pumps are a highly efficient and renewable heating solution for many property owners. These valuable appliances help save money on energy bills, have a low carbon footprint, have a high Seasonal Coefficient of Performance (SCOP), can be utilized for heating and cooling, have low main Read More
  • Why choose an inverter heat pump to heat your pool?


    It's frustrating and uncomfortable to swim while the weather is a bit cold. With the weather shifts, temperatures can drop substantially, especially during cloudy days or winter. A significant drop in temperature can render a pool useless. About 90 % of pools in the U.S. are used two to three times Read More

Recommended Heat Pump Products

Air Source Monoblock Heat Pumps forHot Water/House Heatin

Guangzhou SPRSUN New Energy Technology Development Co., Ltd.

A Professional Heat Pump Manufacturer Since 1999
No.15 Tangxi Road, Yinsha lndustrial Park, Xintang, Zengcheng , Guangzhou, Guangdong, China, 511338

Contact SPRSUN. 7/24 Support. We Will Reply You ASAP!

Tel: 0086-20-82181867
Phone: 0086-18933985692