15
Grant Vortex Oil Boilers
4.4.6 Two pipe oil supplies
Riello RDB burner - 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
On all models except 46/58 and 58/78:
Remove the plastic burner cover (secured by two
screws). To gain access, 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). 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.
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.
6
Connect the
3
/
8
" to
1
/
4
" BSP adaptor to the flexible
fuel line.
7
Flexible fuel lines and adaptors are available to
purchase from Grant Engineering (UK) Ltd.
1/4" BSP female
connections
Tiger Loop
SUPPLY
TO PUMP
RETURN
FROM PUMP
SUPPLY
FROM TANK
Fig. 6 - Tiger loop 'de-aeration' device
4 - GENERAL BOILER INFORMATION
Fig. 7 - Riello RDB pump
1
Oil inlet connection
2
Return connection
3
By-pass screw
4
Pressure gauge connection
5
Pressure adjuster
6
Vacuum gauge connection
7
Solenoid
8
Supply to nozzle
1
2
3
4
5
6
7
8
1
A 230/240 V ~ 50 Hz mains supply is required.
The boiler must be earthed.
2
The supply must be fused at 5 Amp and there must
only be one common isolator for the boiler and
control system, providing complete electrical
isolation.
3
A fused double pole switch or a fused three pin
plug and shuttered outlet socket should be used for
the connection.
4
The power supply cable should be at least 0.75 mm²
PVC as specified in BS 6500, Table 16.
5
All the wiring and supplementary earth bonding
external to the boiler must be in accordance with
the current I.E.E. Wiring Regulations.
6
Any room thermostat or frost thermostat used must
be suitable for use on mains voltage.
7
In the event of an electrical fault after installation
of the boiler, the following electrical system checks
must be carried out:- Short circuit, Polarity, Earth
continuity and Resistance to earth.
Electricity supply
4.5
