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Text | Backflow Damper Replacement on Multiple MicroTurbines with Common Exhaust Duct and/or Wiring Interlock | 001 Capstone Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Telephone: (818) 734-5300 • Facsimile: (818) 734-5320 • Website: www.microturbine.com Service Bulletin SB0059 Date: From: Subject: September 2003 Capstone Technical Support Backflow Damper Replacement on Multiple MicroTurbines with Common Exhaust Duct and/or Wiring Interlock Systems Affected All existing Capstone Model C30 and C60 MicroTurbine systems operating with a common exhaust duct including systems with backflow dampers and/or wiring interlock between multiple MicroTurbines. Safety Precautions Only Capstone Authorized Serviced Providers (ASP’s) should open the MicroTurbine and other equipment connected to the MicroTurbine. The systems can include multiple sources of power. The fuel used by the MicroTurbine is flammable and explosive. Keep flames, cigarettes, sparks, and electrical arc-producing equipment away from the MicroTurbine. Observe and adhere to the Safety Instructions contained within the MicroTurbine documentation. Summary The backflow damper on two or more MicroTurbine systems sharing a common exhaust duct may warp after exposure to heat. This damper failure may affect the seal that prevents exhaust backflow and cause hot exhaust from an operating MicroTurbine unit to flow backwards through a non-operating MicroTurbine unit. Reverse flow of hot exhaust may cause overheating of the generator and engine inlet components, resulting in damage to those components. In addition, damage to the MicroTurbine can result during a start due to backpressure from other operating units. The previously issued Service Bulletin SB0046 offered an interim solution by installing a wiring interlock mechanism between MicroTurbines to overcome the possible safety issue or component failure caused by overheating. This Service Bulletin offers a permanent solution. It is issued to notify Authorized Service Providers of two new backflow dampers to replace the existing dampers on both the Model C30 and Model C60 MicroTurbines. The Part Numbers are 516220 for the Model C30 and 516221 for the Model C60 MicroTurbines. 450027-001 Rev A (October 2003) Page 1 of 2 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. NOTE This Service Bulletin replaces Service Bulletin SB0046 that presented an interim solution to component failures relating to MicroTurbine systems sharing a common exhaust duct.

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