LR3/Disco 3
The FFBH is installed in the front left corner of the engine compartment. It is connected in series with the coolant supply
to the heater assembly. Two electrical connectors on the FFBH connect it to the vehicle wiring.
The FFBH unit consists of:
A circulation pump.
A combustion air fan.
A burner housing.
A heat exchanger.
An air inlet hose and filter.
An exhaust pipe.
A control module.
Circulation Pump
The circulation pump is installed at the coolant inlet to the FFBH to assist the coolant flow through the FFBH and the
vehicle heater core. The circulation pump runs continuously while the FFBH is in standby or active operating modes.
While the FFBH is inactive, coolant flow is reliant on the engine coolant pump. Operation of the circulation pump is
controlled by a power feed direct from the control module.
Combustion Air Fan
The combustion air fan regulates the flow of air into the FFBH to support combustion of the fuel supplied by the auxiliary
fuel pump and to purge and cool the FFBH.
Item Part Number
Description
1
-
Electrical connectors
2
-
Air inlet silencer
3
-
Exhaust pipe
4
-
Coolant outlet connection
5
-
Coolant inlet connection
6
-
Silencer
7
-
Fuel supply line
