Wuhan Questt Asia Technology CO.,LTDWuhan Questt Asia Technology Co., Ltd Address: A7-101, Hangyu building, Wuhan University Sci & Tech Park, EastLake High-tech Dev. Zone, Wuhan, Hubei, ChinaTel: 00862787611146 Fax: 00862759908808 Http://www.questt.com.cn; Email:info@questt.com.cn16German Technology | Made in China4. OperationStep 1) Start the chiller and wait for 1-2 minutes until the water temperature reaches the targetvalue you set. Normally 25 CelsiusDegrees.Step 2) Turn on the safety switch and connect to the main power in factory or home.Step 3) Twist the key switch to start laser welder