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Grant Vortex External Module
6 - BOILER INSTALLATION
See wiring diagrams in Section 10
Note: A test switch is fitted to the control panel to
allow the boiler to be test-fired. When On, the
switch by-passes the external control system.
1 Undo the three screws and remove the lefthand
cover from the control panel to gain access to the
boiler terminal block.
2 Pass the mains power supply cable through the
cable grommet in the control panel, through the
cable clamp and connect to the terminal block as
follows:-
Live (brown) to terminal 2 - marked permanent
live
Neutral (blue) to terminal 3 - marked mains
neutral
Earth (green/yellow) to terminal 4 - marked
mains earth
3 If the circulating pump is to be fitted within the
boiler enclosure, the pump live must be connected
to terminal 7 of the boiler terminal block.
Pass the pump power supply cable through the
cable grommet in the control panel, through the
cable clamp and connect to the terminal block as
follows:-
Earth (green/yellow) to terminal 10 - marked E
Neutral (blue) to terminal 9 - marked N
Live (brown) to terminal 7
Connecting the pump in this way allows it to be
isolated using the isolating switch fitted in the boiler
control panel, for servicing or maintenance work.
4 Ensure that the cable clamp is tightened and that all
cables are secure.
5 Replace the cover on the control panel, with the
yellow warning label facing outwards and secure with
the three screws.
Do not switch on the electrical power to the
External Module at this stage.
See Fig. 6
If a two pipe system is to be used refer to Section 4.4.6.
1 Remove the oil inlet plug from the fuel pump and
connect the elbow of the flexible fuel hose supplied
with the boiler.
2 Connect the flexible fuel hose to the rigid supply
using the adaptor supplied. The supply enters the
enclosure through one of the holes in the bottom of
the side panels.
1 Automatic air vent(s) are fitted to the top of the
boiler. Check that the small cap on the top of each
air vent is screwed on fully, then unscrew it one
complete turn - the cap remains in this position
from now on.
2 If the flexible filling loop is used to fill the system, ensure
it is connected and that the valve connecting it to the
system is open and the valve at the front is closed.
A valve is open when the operating lever is in line with
the valve, and closed when it is at right angles to it.
3 Ensure that the mains cold water supply valve is open
(operating lever in line with the valve), then turn on the
mains cold water supply and gradually open the front
valve on the filling loop until water is heard to flow.
4 Vent each radiator in turn, starting with the lowest
one in the system, to remove air.
5 It is important that the pump is properly vented to
avoid it running dry and damaging its bearings. To
gain access to the pump for venting it is necessary
to remove the top panel, or rear panel (50/70 model
only).
Remove the cap, then unscrew and remove the plug
from the centre of the pump. Using a suitable
screwdriver rotate the exposed spindle about one
turn. Replace the plug and cap.
6 Check the operation of the safety valve by turning
the head anticlockwise until it clicks. The click is
the safety valve head lifting off its seat allowing
water to escape from the system.
Check that this is actually happening.
7 Continue to fill the system until the pressure gauge
indicates between 0.5 and 1.0 bar. Close the fill point
valve and check the system for water soundness,
rectifying where necessary. Water may be released
from the system by manually operating the safety
valve until the system design pressure is obtained.
Connect the power supply
6.7
Connect the fuel supply
6.8
Fill the sealed system
6.9
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