Sectioned View of FBH Unit (Heating and ventilation)

Sectioned View of FBH Unit

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M80 0472

1 Combustion air fan 2 Burner housing 3 ECU 4 Heat exchanger 5 Burner insert 6 Exhaust 7 Glow plug/flame sensor

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8 Evaporator 9 Coolant inlet 10 Circulation pump 11 Fuel inlet 12 Coolant outlet 13 Air inlet

The FBH unit consists of: l A circulation pump l A combustion air fan l A burner housing l An ECU/heat exchanger l An air inlet hose l An exhaust pipe l An air inlet filter

Circulation Pump The circulation pump is installed at the coolant inlet to the FBH unit to assist the coolant flow through the FBH unit and the heater assembly. The pump runs continuously while the FBH unit is in standby or active operating modes. While the FBH unit is inactive, coolant flow is reliant on the engine coolant pump.