11
Tiger Loop system -
(See Figures 3-3 and 3-4)
When the storage tank outlet is below
the burner, an alternative to a two
pipe system can be achieved using a
‘Tiger Loop’ type oil de-aerator. This
effectively removes the air from the oil
supply on a single pipe lift.
The de-aerator is connected close
to the boiler as a two pipe system
(omitting the non-return valve) as shown
in Figure 3-3.
Refer to the manufacturers instructions
supplied with the de-aerator.
The de-aerator must be mounted
vertically. See Figure 3-3 and 3-4.
To be used with a de-aerator, the
burner must be fitted with an additional
flexible fuel hose (a flexible fuel hose
(900 mm) and 3/8” to 1/4” BSP male
adaptor are available to purchase from
Grant UK (product codes: RBS35 and
RBS36).
3.2 Burner Oil Connection
The burner fuel pump is supplied for
use with a single pipe fuel supply
system.
For use on a two pipe system, it is
necessary to fit the By-pass screw, as
shown in Figure 3-5, into the tapping in
the return port.
The By-pass screw is supplied in the
boiler accessory pack.
Remove the plastic burner cover
(secured by two screws).
For ease of access to the fuel pump, to
fit the by-pass screw and connect the
oil lines, the burner can be removed
from the boiler. To do this, unscrew the
single nut at the top of the burner (using
a 13 mm spanner) and withdraw the
burner from the boiler.
Remove and discard the blanking plug
from the return connection of the pump
and fit the By-pass screw using an
hexagonal key.
Connect the return oil flexible fuel pipe
to the pump.
Connect the 3/8” to 1/4” BSP adaptor to
the flexible fuel pipe.
Flexible fuel pipes and adaptors are
available to purchase from Grant UK.
The blanking plug supplied in the inlet
(suction) port may now be plastic and
will not provide an oil tight seal when
the pump is running.
Item Description
1 Inlet (suction) port
2 Return port
3 By-pass screw
4 Pressure gauge port
5 Pressure adjustment
6 Vacuum gauge port
7 Solenoid
8 Nozzle outlet
Figure 3-4: Tiger loop de-aeration device
Figure 3-5: Riello RDB pump
!
WARNING
Ensure that the supply from the tank
is connected to this port and that
the plastic plug is discarded.
!
WARNING
To prevent any possibility of fuel
fumes entering the building, the
de-aerator must be fitted outside in
accordance with BS 5410-1:2014.
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