HVAC automatic control system regulating valve is a building management and control system, called bas (building automation system), which centrally monitors, manages and decentralized controls the operation, safety status, energy use status and energy-saving management of HVAC, water supply and drainage, power supply and distribution, elevator, lighting and other decentralized equipment in buildings or buildings. The regulating valve of HVAC automatic control system is the full coverage of Electromechanical Specialty, mainly including monitoring and control. The monitoring scope mainly includes the operation status and safety status of the equipment, and the control scope includes the start-up and stop management and energy-saving management of the equipment. For special large-scale equipment, due to the complexity of unit control, Ba generally only collects unit parameters and reflects them on the control computer, rather than controlling the operation of the unit. It only monitors but does not control, such as chillers, gas-fired boilers, etc.

The control objects of the automatic control system in the HVAC automatic control system include the fan, the air valve at the fresh air inlet, the filter, and the electromagnetic two-way or three-way valve set in the return pipe of the cold and hot coil. The control schematic diagram is shown in Figure 1. The fan control consists of three digital input nodes and one digital output node. The digital input node of the regulating valve of the HVAC automatic control system monitors the operation status, manual / automatic status and fault alarm of the fan respectively. The digital output node controls the start and stop of the fan. Differential pressure sensors are set at the front and rear of the fan to monitor the actual operation state of the fan.

The fresh air temperature and humidity sensor is set in front of the fresh air valve of the HVAC automatic control system control valve as the analog input node; Adjust the opening of the fresh air valve, and set the analog output node controlled by the air valve and the analog input node fed back by the air valve; The regulating valve filter of HVAC automatic control system is equipped with differential pressure sensor, which is a digital input node; The coil return water two-way valve is equipped with valve control analog output node, valve opening feedback analog input node and coil antifreeze alarm digital input node. The humidifier water supply two-way valve is equipped with a digital output node to control the opening and closing of the valve; The air supply temperature and humidity sensor is set at the air supply pipe to detect the air supply temperature and humidity, which are analog input nodes.

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