Combi 70 & Combi 90 Oil Boilers
12
1/4" BSP female
connections
Tiger Loop
SUPPLY TO PUMP
RETURN FROM PUMP
SUPPLY FROM TANK
Fig. 6 - Tiger loop
3.4.5 Tiger Loop system - (See Figs. 5 and 6)
1 When the storage tank is below the burner, an
alternative to a two pipe system can be achieved using
the Tiger Loop oil deaerator. This effectively removes
the air from the oil supply on a single pipe lift.
2 The Tiger Loop is connected close to the boiler as
a two pipe system (omitting the non-return valve)
as shown in Fig. 5. Refer to the manufacturers
instructions supplied with the Tiger Loop. The
Tiger Loop must be mounted vertically.
Note: To prevent any possibility of fuel fumes
entering the building, the Tiger Loop must be
fitted outside.
3 To be used with a Tiger Loop system, the burner
must be fitted with an additional flexible fuel line
(a flexible fuel line (900 mm) and
3
/
8
" to
1
/
4
" BSP
male adaptor are available from Grant Engineering
(UK) Limited - Part No. RBS104).
See section 3.4.6.
3 - GENERAL BOILER INFORMATION
Fig. 5 - Tiger loop system
3.4.6 Two pipe oil supplies
See Fig. 7
1 The 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 (see
Fig. 7) into the tapping in the return port.
2 The By-pass screw is supplied in the boiler
accessory pack.
3 Remove the plastic burner cover (two screws). To
gain access, it may be necessary to remove the grey
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.
4 Remove and discard the blanking plug from the
return connection of the pump and fit the By-pass
screw using an hexagonal key.
5 Connect the return oil flexible fuel line to the pump.
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