The Pressure Control example application algorithm is designed to maintain the set over- or under-pressure in the room, measured in relation to a reference, e.g., a corridor, and also, optionally, achieve the set temperature by controlling the heating source based on the occupancy status, measured temperature. It functioning is formulated on the operation the following control loops:
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pressure control loop is based on the currently measured differential pressure between the room and the reference source in relation to the requested pressure setpoint for the room. The demand for pressure is affected by the level of damper opening resulting from the pressure control loop;
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optional space temperature control loop determines the demand for heating based on the room temperature measurement and the corresponding setpoint temperature;
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optional discharge air temperature control loop is used to regulate and limit the discharge air temperature specified by the current discharge air setpoint based on the discharge air temperature measurement. It has the effect of regulate and limiting the reheater control only. The discharge air temperature control loop operates only when there is a need for heating and discharge air temperature sensor is connected. If there is no discharge air temperature sensor, the control loop has no effect on regulate and limiting the discharge air temperature (it has a value of 0).