1Chapter 1:Before You StartContacting Ritchie Engineering:To order accessories, receive assistance, or locate the nearest YELLOW JACKET distributor.Corporate Office and Mailing Address:Ritchie Engineering Co, Inc. YELLOW JACKET Products Division 10950 Hampshire Avenue SouthBloomington, MN 55438-2623 U.S.A.Phone: (952) 943-1300 or (800) 769-8370Fax: (800) 769-8370E-mail: custserv@yellowjacket.com www.yellowjacket.comSafety Information:Use the instrument only as specified in this manual. Otherwise, the protection provided by theinstrument may be impaired. Refer to safety information in Table 1-1.A Warning identifies conditions and actions that pose hazards to the user. A Caution identifiesconditions and actions that may damage the instrument or the equipment under test.Table 1-1. Safety InformationWarningTo avoid personal injury or death, follow theseguidelines:• Most governments and legal authorities re-quire that HVAC technicians be trained andcertified in the safe and proper operation ofHVAC tools, such as this instrument. Sincethis tool may be connected to many types ofequipment through a limitless combinationof hoses and fittings, proper training is themost important element of using this toolsafely.• Read the entire User Manual before usingthe instrument.• Use the instrument only as described in theUser Manual, otherwise the protection pro-vided by the equipment may be impaired.• Do not use the instrument if it is damaged.Before you use the instrument, inspect thecase. Look for cracks or loose components• The instrument contains no internal user-serviceable parts; Do not open theinstrument. Have the instrument servicedonly by Ritchie Engineering Co. orauthorized service centers.• Do not use the instrument if it operates ab-normally. Protection may be impaired.When in doubt, have the instrumentserviced.