Four Pipe Fan Coil Units

The four pipe hvac system has a number of advantages over a two pipe system.

Four pipe fan coil units.

Since it is often necessary to heat and cool different areas of a building at the same time due to differences in internal heat loss or heat gains the four pipe fan coil unit is most commonly used. Fan coil units are designed to provide dehumidification of the area served. This unique arrangement allows the system to stage on and off to meet the varying demands each day and throughout the year. In the simplest terms whalen s innoline 50 50 four pipe system unit is the combination of two 2 pipe riser fan coil units.

Four pipe fan coil units have two 2 supply pipes and two 2 return pipes. A four pipe fan coil unit consists of a fan chilled water cooling coil hot water heating coil and air filter. With its unique ability to stage performance the innoline 50 50 four pipe fan coil system is a game changer. Two pipe systems have to be manually switched over which is not only inconvenient but time consuming.

On the contrary in four pipe fan coil systems there is the ability some rooms of a building to be heated and others to be cooled depending on the orientation and the needs of each area of the building. Each half of the unit is sized to meet one half of the heating and cooling load. Four pipe systems have separate heating and cooling fan coil units and separate pipes for heating and cooling. This means that hot or chilled water is always available so the system can immediately change over from heating to cooling mode.

However the amount of dehumidification provided can be limited by increasing the chilled water supply temperature.