Crown Boiler CLBR68-112 - Manual (Page 39)

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Venting System: The furnace flue pipe, vent connector, barometric damper, and
chimney should be inspected for:
• Signs of excessive rust, corrosion pitting, and holes.
• Signs of condensation or moisture leakage (sometimes indicated by soot or
condensate streaks).
• Evidence of structural damage, and loose or disconnected piping joints.
• Presence animal nests.
• Free movement of the vane of the barometric damper without binding or
interference.
If any problems are evident, call a qualified heating contractor for assistance.
NOTICE: A qualified heating contractor MUST service the oil burner and inspect
the heat exchanger in this furnace at least once a year.