Under normal circumstances, the exhaust air supply should be reported to the first cutting region, the Chaoyang exhaust fan, so fan air for combustion, but in accordance with the "high level of civilian health plan made nuisance fire standards" (GB50045-95,2001年版) 8. 4.11 and "cars library, repair garages, brake library planning hinder fire standard" (GB50067-97) defined in 8.2.7, the senior civilian health set up machine-made exhaust of underground chambers and no cars library There was an opening in the dispersion hinder fire partition directly to the outside, when you set the machine exhaust system, the air supply system when Hou set to be the same. Air system blower and send damper linkage fire should start to produce a positive pressure area, smoke exhaust before signing out. Two-speed exhaust fan and exhaust mechanical electron source shall request the fire power supply. 1. centrifugal fan wind chassis, the required electrical power is the condition to be determined, together with proper mechanical loss reserves, it is not a required air full of power, such as the fan outlet is not then pipe or add external resistance and empty running, the motor burned danger, fire exhaust fan, for safety reasons, two-speed exhaust fan, the valve should be added at the fan outlet or inlet pipe, start fan When closed, the valve will run slowly open, is reached a predetermined condition, and pay attention to fan current exceeds a predetermined value. 2. The fan allows full pressure start or step-down start, but it should be noted that the current full voltage starting time of 5 to 7 times the rated current, voltage starting torque is proportional to the square of the voltage, when there is insufficient grid capacity, should be used voltage starting. (When the power is greater than 11KW, should adopt the step-down start). 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, Francis exhaust fan 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 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. Chaoyang exhaust fan | Chenyu air conditioning | exhaust fan principle be provided by Wu Cheng Chen-yu air-conditioning Limited. Chaoyang exhaust fan | Chenyu air conditioning | exhaust fan principle is wucheng Chenyu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) this year introduced a new upgrade, the above picture is for reference only, please call or pictures on this page contact telephone number, to obtain the latest information, contact: sand manager.