Fan Coil Unit System Design

Examples of blow through ahus in different stages.

Fan coil unit system design.

Fan coil units are a fairly simple design. Properties of coils and coil design fan coil units can be used to introduce outdoor air into a space circulate and filter air within a space and provide heating and or cooling within a space. The basic components of a fan coil unit are a heating cooling coil fan section and a filter. A fan coil unit fcu also known as a vertical fan coil unit vfc is a device consisting of a heat exchanger coil and a fan.

As part of an hvac system found in residential commercial and industrial buildings a fan coil unit is often connected to ductwork and a thermostat to regulate the temperature of one or more spaces. We design unitrane fan coil units as an integral part of the company s system solutions with standard iaq related features that fully comply with ashrae 62. The terminal units are usually mounted either under the window or in a ceiling void from which a number of supply outlets can be served. The refrigerant is pumped through copper pipes to a fan coil unit where it is forced through an expansion valve and a coil where it changes state from a liquid to a gas and absorbs heat from its surroundings.

5b shows a trap for a blow through ahu with the fan off. Air is blown over the cooling coil through which the refrigerant passes and heat is transferred to the coils and then to the refrigerant. Figures 5a 5b and 5c. In the latter case the ceiling void can be used for the return air.

Due to their simplicity fan coil units are more economical to install than ducted air handling units. Using advanced technology these systems reliably and efficiently deliver the comfort your building occupants need. You can see where it gets it s name from because it basically just a fan and a coil heat exchanger. The extensive selection of available standard and optional features provides the versatility you need to fit any heating ventilation and air conditioning system design.

The air enters via the back through a filter to clean the air from dust etc. Fan coil units can be wall mounted freestanding or ceiling mounted and may be concealed in ceiling voids. In many ways a fan coil system is similar to the induction system with changeover nonchangeover and four pipe systems being used. They may be controlled by local thermostats or by a building management system bms.

When the fan starts it would create a positive pressure blow through fan and pushes the water away from the pan resulting into proper draining of the system. York fan and blower coil units fcus provide maximum performance unparalleled design flexibility and superior serviceability. 5a is a general example of a blow through ahu.