Worcester 25Si Installation And Servicing Instructions page 11

Wall mounted combination boilers for central heating and mains fed domestic hot water
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Fig. 12. Functional flow diagram.
Outputs
Inputs
DHW control knob
CH Control knob
Electronics/
microprocessor
CH pressure adjust pot
(Safety Low Voltage)
Gas valve mode switch
Reset button
Convert AC to low
voltage electronics
Electronics
Fan
Pump
Electronics
11

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28si

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