Underfloor Air
4-Pipe Active Chilled Beam
The 4-Pipe model is designed to maximize control and always meet any heating and cooling needs. Two supply and return water connections are located on opposite ends of the chilled beam. Hot and Chilled water can be simultaneously passed through these based on the building demands. Time modulated air valves and water valves allow the unit to meet demand based on a thermostat located in the space.
4-Pipe Modes of Operation
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Cooling Mode The Thermostat detects a cooling condition: The control box will begin to time modulate the air valves and open the chilled water valve. Chilled water flows through the coil, and air passes through the unit in a time modulation of six second full open bursts. Once the thermostat detects that the occupied space has reached set point, the system will return to suspend mode, closing the air and chilled water valves awaiting further system demands. |
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Heating Mode The Thermostat detects a heating condition and the Aquastat detects hot water: The control box will begin to time modulate the hot water valve while the air valve remains closed. As hot water flows through the coil, air falls into the chilled beam where it is heated and convects out into the space. If additional heating is required to reach setpoint, the air valve will also time modulate. Once the thermostat detects that the occupied space has reached set point, the system will return to suspend mode, closing the air and hot water valves, awaiting further system demands. |
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