Two-speed exhaust fan is increasingly used in high-level basement, garage ventilation exhaust work, then the installation must pay attention to the normative wiring method, the size of today tells you what knit two-speed fan Connection: 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 connection speed by changing the basic principles of the method of stator windings, so which changes the number of poles in order to achieve the purpose of speed, low-speed work for △ (or Y) method; high-speed operation mode when 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. How it works: the usual two-speed high-temperature exhaust fan at low speed in order to meet the exhaust air flow exhaust fan service, when a fire occurs exhaust fan, temperature exhaust fan in the cabinet under the joint control of the role of automatic high-speed operation, in order to meet the needs smoke at the same time, do not smoke damper fire smoke partition action exhaust pipe smoke damper and air duct complement and supplement the wind carried smoke exhaust fan wucheng, automatic smoke damper other smoke partition two-speed fan control principle: The Company two-speed fan motors are equipped with two-speed electrically stator windings △ / XY (or Y / XY), speed connections by changing the basic principles of the stator windings of the exhaust fan Chen Yu, it changed the number of poles in order to achieve the purpose of speed, low-speed operation △ (or Y) mode, high-speed operation of XY mode. Wind the electrical control box with circuit breaker, protection devices and other electrical components must be properly rational use of rated capacity by fan exhaust fan exhaust fan _ quote _ Chenyu conditioned by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) strong, credible, Shandong Texas fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chenyu into the brilliant air conditioning and you work for a better future!