Further installation and connection details can be found in the Installation & Commissioning Manual. BTI Installation diagram Unvented 1 Pressure reducing valve 3 T&P valve 4 Stop valve 5 Non-return valve 6 Circulation pump 9 Drain valve 10 Gas cock 11 Isolating valve 14 Hot water outlets 15 Expansion relief valve 16 Expansion vessel A Cold water B Hot water C Return circulation D Gas supply A.O. Smith unvented system kits utilise combination valves. A water heater should be installed in accordance with local standards and ventilation requirements (category B11BS). Further installation and connection details can be found in the Installation & Commissioning Manual. Data subject to change INT/0808/BTI/01 Terms and conditions apply, please refer to our website. BTI Electrical diagram BTI A Ignition controller B ON/OFF switch C Pilot burner D Spark electrode E Flame probe F Transformer flame detection (optional) G Combustion products discharge safety device H Control thermostat K Safety thermostat L Timer (optonal) M Remote button N Terminal block P Terminal block R Earth terminals S Connector to ignition controller T Gas control valve U Connection strip V Tank earth W Casing earth X Control panel base plate earth For the parts numbers of components please refer to the “Maintenance and accessories” chapter. ...

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