Two-speed exhaust fan to be more and more applications in high-level basement, garage ventilation exhaust power, then we must pay attention when installing wiring normative approach, the size of the compiled it for you today talking about the two-speed fan Wiring Methods: Large two-speed exhaust fan wiring methods: In general, the distribution of electrical power in the following 4KW Y junction; 4KW above (including 4KW) △ connection. Large air-conditioned two-speed fan of the group of companies with dual-speed motor stator winding is △ / YY (or Y / YY) connection. Two-speed exhaust fan control principle: The Company of the two-speed fan motor with double quick set its stator windings △ / YY (or Y / YY) change the connections between the motor stator windings connected in exhaust fan, speed through the basic principles method to change the number of poles in order to achieve the purpose of two-speed exhaust fan speed, low-speed work for △ (or Y) method; YY way for high-speed work. The electrical control box with wind breakers, protective devices and other electrical components must be correct and reasonable by matching fan rated capacity. Fire exhaust fan set Location: Distance tunnel fire exhaust fan should not be too close to the side wall, so as not to affect the ventilation exhaust fan fire tunnel wall arranged for a minimum 20 cm distance from the fire temperature exhaust fan, rescue "sentinel" of. Set the tunnel disaster prevention into different regions, make full use of fire exhaust fan deviated and fixed at both ends of the tunnel as a rescue station into fresh air and exhaust channels, cross ventilation openings must maintain positive pressure state Axial row Smoke fan, prevent smoke flow channel. ventilation system blowing from the direction of the accident tunnel through a secure tunnel to cross the channel, inhibiting the flue gas into a cross-channel and tunnel accident did not occur to meet the evacuees facing the new air into the transverse channel and security the tunnel, waiting area while ensuring the required fresh air tunnel according to different regions use different incidents of disaster prevention and Ventilation. "sentinel" Disaster ventilation scheme implemented when the train rescue point in the "sentinel" range for all Cross liaison channel settings can be reversed within a secure tunnel fan made from fresh air. Axial exhaust fan, Chen Yu-conditioning (certified), Langfang City exhaust fan provided by Wu Chen Yu Air Conditioning Equipment Co., Ltd. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioning in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu conditioning a better future.