Abstract: A room pressure control system includes an air supply valve, an exhaust valve, and controller circuits. One of the controller circuits includes a room pressure correction control circuit that controls the valve operating as a room pressure control valve, between the air supply valve and the exhaust valve, so that the room pressure coincides with a set room pressure value; and processing circuitry that determines whether the room pressure easily fluctuates, determines whether the room pressure is stable, and sets parameters. In particular, the processing circuitry sets a dead zone parameter with which responsiveness of room pressure control is valued when it is determined that the room pressure easily fluctuates and otherwise sets a dead zone parameter with which reduction in the number of operations of the room pressure control valve is valued above the responsiveness of the room pressure control.

Abstract: A room pressure control system includes an air supply valve, an exhaust valve, and controller circuits. One of the controller circuits includes a room pressure correction control circuit that controls the valve operating as a room pressure control valve, between the air supply valve and the exhaust valve, so that the room pressure coincides with a set room pressure value; and processing circuitry that determines whether the room pressure easily fluctuates, determines whether the room pressure is stable, and sets parameters. In particular, the processing circuitry sets a dead zone parameter with which responsiveness of room pressure control is valued when it is determined that the room pressure easily fluctuates and otherwise sets a dead zone parameter with which reduction in the number of operations of the room pressure control valve is valued above the responsiveness of the room pressure control.

Abstract: A room pressure controlling system includes: a room pressure correction controlling portion that controls a supply air valve or an exhaust valve, whichever is operated as a room pressure controlling valve, so that a between-room differential pressure between an applicable facility and a reference room that is set to a reference room pressure will match a room pressure set point; an offset flow rate set point switching portion that switches an offset flow rate set point when an instruction has been received from an outside to switch the applicable facility between positive and negative pressure; and a room pressure set point switching portion that switches the room pressure set point in coordination with switching of the offset flow rate set point.