Relative humidity control new air unit relative humidity control main thing is to choose the setting position of the humidity sensor or control parameters, which with its humidification source and control the way. (1) steam humidification high demand for places, should be based on the controlled humidity requirements, automatically adjusts the amount of steam humidification. This approach requires the steam humidifier should be used between the regulator valve (linear characteristic), the regulator should be used PI controller. Because of the stability of this approach is better fresh air unit horizontal, humidity sensors can be located on the engine room air duct. General requirements for high-rise residential buildings are concerned, can also be used on-off control. This can be bit humidifier (with quick opening valves) and bit-type regulator, reducing investment is beneficial. Failure fresh air unit malfunction new air unit is mainly the heat exchanger is the cracking, a building chillers using VAV air-conditioning system, the emergence of four new air unit from the cracking incidents new air unit specifications from construction to commissioning and then invested a total run of the building A total of 15 new air unit, the cracking of the proportion of up to 27%. The reason, a) temporary pipeline without rinsing that the new air unit supply; to catch up period is often temporary heating with a new air unit, but because of time constraints entire heating system is not officially washed with water supply and return piping used in all the competent connected manifolds connection, the results of an in-line dirt away from the continuous deposition heat transfer stations within the last fresh air unit heaters new air unit maintenance, declining water flow, causing the heater cracking. In essence, the construction of temporary water supply pipeline construction procedures fails to wash blindly put into use caused the cracking heater. The new air unit Horizontal | Xiqing new wind generating units | Rui Xincheng Rui Xincheng air conditioning provided by the Texas Air Conditioning Equipment Co., Ltd .. Texas Rui Xincheng Air Conditioning Equipment Co., Ltd. (www.dzrxckt.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Rui Xincheng air conditioning and you hand into the brilliant, for a better future!