12
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 prevent any possibility of fuel
fumes entering the building, the
de-aerator
must
be fitted outside in
accordance with BS 5410:1:1997.
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,
Part No. 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.
On all models except 46/58 and 58/78:
Remove the plastic burner cover
(secured by two screws). To gain access
on Kitchen/Utility models, it may be
necessary to remove the plinth - loosen
the screw securing the right hand side
of the plinth, then withdraw the plinth
forward from the right and away from the
case.
On 46/58 and 58/70 models only:
Remove the plastic burner cover
(secured by three screws). On Kitchen/
Utility models it may be necessary to
remove the burner from the boiler to
access the cover screws - see below.
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.
Ensure that the supply from the tank
is connected to this port and that the
plastic plug is discarded.
1/4" BSP female
connections
Tiger Loop
SUPPLY
TO PUMP
RETURN
FROM PUMP
SUPPLY
FROM TANK
WARNING
!
Oil Storage & Supply
System
Figure 3-4:
Tiger loop de-aeration device
1
2
3
4
5
6
7
8
Figure 3-5:
Riello RDB pump
description
Inlet (suction) port
Return port
By-pass screw
Pressure gauge port
Pressure adjustment
Vacuum gauge port
Solenoid
Nozzle outlet
Item
1
2
3
4
5
6
7
8
WARNING
!
