1 Boiler feed 12 Air pressure monitor exhaust (behind the fan)
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3 Boiler return 14 Fan
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6 Water pressure monitor (on boiler return) 17 Ignition transformer (below the control housing)
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8 Siphon 19 Connection for safety group
9 Suction hose 20 Air supply duct
10 Venturi 21 Exhaust gas connection
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Maintenance
441