North American Offices: 3133 East Kemper Road ° Cincinnati, Ohio ° 45241 ° USA ° Tel: +1 (513) 771-2200 ° Fax: +1 (513) 771-0726 European Offices: Grange Works ° Lomond Road ° Coatbridge, Scotland ° ML5 2NN ° Tel: +44 (0)1236 427 274 ° Fax: +44 (0)1236 427 274

May 27, 2010

Service Bulletin Potential Cooling Loop Water Flow Restriction This bulletin is to inform you of the possibility of excessive pipe thread sealant inside some Clarke supplied cooling loop assemblies. Pipe sealant has the potential to break free along with other debris and collect in the cooling loop strainers which could result in a cooling loop water flow restriction leading to an engine overheating condition. The presence of external pipe thread sealant is a normal condition and does not necessarily indicate excessive internal pipe thread sealant. To ensure proper engine performance, make sure that the system is installed according to NFPA 20, and maintained according to the manufacture’s installation and operation manuals and NFPA 25. Additionally, Clarke recommends removing, inspecting, and cleaning both cooling loop strainer screens and flushing water out of the strainer wye before and after the initial start up, and before every weekly test run. It may also be necessary to remove/inspect and clean the screens (if so equipped) in both pressure regulators and make sure there is no debris obstructing the operation of the regulator and the flow of cooling water. Proper system maintenance does not require the disassembly of the cooling loop. If you have any questions regarding this service bulletin, please call or e-mail customer support. Sincerely yours,

John Whitney John T. Whitney III Customer Support Manager +1 513-475-3414 jowhitney@clarkefire.com