| CPC F24F 11/67 (2018.01) [F24F 11/64 (2018.01); F24F 11/84 (2018.01); F24F 11/89 (2018.01); F24F 2110/10 (2018.01)] | 20 Claims |
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1. A method of operating a two-pipe fan coil unit (FCU) that is configured to control a temperature within a space of a building, the FCU having a heat exchanger coil that receives a supply fluid from a supply pipe and returns a return fluid to a return pipe, the FCU further having a fan for blowing air across the heat exchanger coil and into the space of the building, a flow of supply fluid through the heat exchanger coil is controlled by a flow control valve, the supply fluid is heated when the building is in a building heating mode and the supply fluid is cooled when the building is in a building cooling mode, the method comprising:
controlling the flow control valve and the fan using a controller, wherein the controller has a heating control mode and a cooling control mode;
the controller changing a position of the flow control valve from a first position to a second position, wherein the second position is more open than the first position;
the controller activating the fan to blow air across the heat exchanger coil and into the space of the building;
the controller monitoring a space temperature in the space;
the controller determining that the space temperature is increasing, and, in response, the controller determining that the building is in the building heating mode and setting the controller to the heating control mode; and
after setting the controller in the heating control mode, the controller comparing the space temperature to a heating temperature set-point, and opening the flow control valve when the space temperature is below the heating temperature set-point to raise the space temperature toward the heating temperature set-point.
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