Common problems of fresh air unit operation

Common problems in the safe operation of fresh air units

1. During the winter operation of the fresh air unit, great attention should be paid to the anti-cooling work of each air conditioning and ventilation equipment and pipeline. The air handling of fresh air units is more complicated than that of fresh air units. Fresh air units are mostly used in large public areas where fan-coil units cannot be installed, while fresh air units are mostly used in small areas where fan-coil units can be installed. Pay attention to the average outdoor temperature when cleaning pipe in hydrostatic test. Be sure to completely empty yourself after cleaning. Temporary heating of fresh air units shall be carried out in accordance with all normal procedures. In the absence of an automatic control strategy and a full-time personnel management method, temporary heating without fresh air system air conditioning and ventilation equipment is recommended.

2. Establish and improve the operation management plan. When the fresh air unit is stopped at night, the inlet valve or temperature controller of the fixed automatic displacement control system should be turned on or the electric heater equipment should be set to ensure the temperature of the electric heater of the fresh air unit. During the operation of fresh air units in winter, regular inspection should be conducted to track temperature changes. In cold weather, the air-conditioning unit is not suitable for adjustment and maintenance to ensure the safety of the air-conditioning water system.

3. The designed fresh air unit must be equipped with reasonable anti-cooling automatic control interlock monitoring equipment. A fresh air unit is an air conditioning unit that provides fresh air. In terms of function, it can realize constant temperature and humidity, or simply provide fresh air according to the requirements of the use environment. Functions such as dust removal, dehumidification (or humidification), cooling (or heating) can be determined according to the needs of the use environment. The more complete the function, the higher the cost. Air conditioning units and fresh air units are commonly used and fan boxes are installed. Although there are differences between fresh air units and air conditioners, they can complement each other in function. It is suggested to install fresh air units at the same time, and then install fan coil units in each room separately, so as to learn from each other and achieve the goal of more energy saving and more comfortable. When the centrifugal fan of fresh air unit is running, the rated water output of electric heater should be guaranteed first. When the temperature is too low or the water output is too much, should alarm, and immediately close the fan thermal insulation electric air valve and fresh air system channel.