Two-speed exhaust fan in high-rise building fire smoke system for high-level basement usually work accident smoke exhaust state two-speed, two-speed asynchronous motor is particularly suitable. Two-speed fan running at high speed into a low-speed synchronous speed improve a lot, the amount of exhaust greatly improved accordingly, then the system immediately replaced by the exhaust smoke condition. But in the design process, will encounter Electric two-speed fan control problems, that is how to solve the motor windings transition from Δ-connected to a dual-Y-connected and interlocked exhaust fan factory, fire linkage automatic and Manual control; blower protection shutdown and how to maximize the protection of reliability in high speed accident in smoke, how to ensure that the power supply and other issues. Two-speed exhaust fan is increasingly used in high-level basement, garage ventilation exhaust work, then the installation must pay attention to the normative exhaust fan wiring method of application, the size of knitting today you say something about it Wiring two-speed fan: Large two-speed exhaust fan wiring methods: In general, the distribution of electrical power in the following 4KW Y wiring; 4KW or more (including 4KW) △ connection. Large air-conditioned two-speed fan of the group with double speed motor stator winding is △ / YY (or Y / YY) connection. Two-speed exhaust fan control principle: The Company two-speed fan motors which are equipped with double quick set stator windings △ / YY (or Y / YY) connection, the basic principles of speed Connections smoke stator windings by changing Fan specification to change the number of poles in order to achieve the purpose of speed, low-speed work for △ (or Y) method; high-speed operation mode is YY. Wind the electrical control box with circuit breaker, protection devices and other electrical components, according to the fan must be properly reasonable matching the rated capacity. Setting smoke damper in exhaust fan and exhaust pipe connections, not the end in the exhaust pipe set exhaust valves, exhaust valves and pay attention to the function smoke damper is completely different device. Exhaust valve usually normally closed exhaust fan, open fire, and alarm host linkage, open the condition that an outbreak of fire alarm system (detector alarm), fire alarm host into automatic mode, exhaust valves open automatically, linked smoke fan starts. Smoke damper is usually always open, but also turned a fire, but when the smoke temperature reaches 280 ℃, the exhaust damper automatically closes, the linkage has been opened fan stops running. Exhaust fan Quote | Chenyu air conditioning (certified) | Pu'er exhaust fan by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioned in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu air conditioning better future.