Grant EUROFLAME 50/70 User, Installation And Servicing Instructions page 27

3 Withdraw the cable support bushes from the cover.
Pass the burner supply cable through one of the
bushes and connect it to the boiler (control)
thermostat (refer to Fig. 29) as follows:-
Brown to terminal 1 on the control thermostat
Green/Yellow to the earth terminal, marked
on the control thermostat
4 Pass a switched mains power supply through the
other cable support bush and connect it to the
overheat thermostat (refer to Fig. 29) as follows:-
Switched live (brown) to terminal C on the
overheat thermostat
Earth (green/yellow) and earth fly lead from casing
to the earth terminal, marked
thermostat
The Blue (neutral) wire from the burner supply must
be linked to the incoming neutral of switched mains
supply using a single connector (not supplied).
Refer to section 8.4. For other systems not covered,
contact Grant Engineering (UK) Ltd.
DO NOT connect the neutral wires to either of
the two thermostats.
5 Connect a link between terminal 2 on the overheat
thermostat and terminal C on the control
thermostat.
6 There are no connections to terminal 1 on the
overheat thermostat and terminal 2 on the
control thermostat.
7 Position the support bushes so as not to strain the
connections when the cover is replaced.
Place the cover in position locating the bushes at
the same time.
Note: It may be necessary to rotate the thermostat
knob to engage it on the operating spindle as the
cover is replaced.
8 Secure the cover in position by tightening the three
screws. Tighten the cable support bush nuts to
secure the cables.
9 Ensure that all external wiring is adequately supported.
Do not switch on the electricity supply at this stage.
4 - BOILER INSTALLATION
,
, on the overheat
Euroflame Oil Boilers
Connect the fuel supply
4.6
See Fig. 6
If a two pipe system is to be used refer to section 3.4.8.
1 Remove the plug from the fuel pump oil inlet
adaptor and connect the elbow of the flexible fuel
line supplied with the boiler.
2 Connect the flexible fuel line to the rigid supply
using the adaptor supplied. For Kitchen/Utility
models the supply enters through one of the holes
at the bottom of the case sides or the back panel.
4.7 Fill and vent a sealed system
Expansion vessel pressure
The expansion vessel fitted is supplied with a
charge pressure of 1.0 bar (equivalent to a max.
static head of 10.2 metres). The charge pressure
must not be less than the actual static head at the
point of connection (see Fig. 14). Do not pressurise
the vessel above 1.5 bar.
The air pressure in the vessel must be checked annually.
The central heating system volume, using the
expansion vessel as supplied, must not exceed 107
litres. If the system volume is greater, an extra
expansion vessel (complying with BS 4841) must be
fitted as close as possible to the central heating return
connection on the boiler. The charge pressure of the
extra vessel must be the same as the vessel fitted in the
boiler. Refer to BS 7074:1 for further guidance.
The air charge pressure may be checked using a tyre
pressure gauge on the expansion vessel Schraeder valve.
The vessel may be re-pressurised using a suitable pump.
When checking the air pressure the water in the heating
system must be cold and the system pressure reduced to
zero.
A simple test to check if the expansion vessel size is
adequate, is to fill the system cold to 1.0 bar, then fully
heat the system and if the pressure rises no more than 2.0
bar the vessel is adequate. A higher figure indicates that
an extra vessel is required.
Fill the system
1 An automatic air vent is fitted to the top of the
boiler (see Fig. 20). Check that the small cap on the
top of the air vent is screwed on fully, then unscrew
it one complete turn - the cap remains in this
position from now on.
2 Ensure that any valves in the heating system
pipework are open.
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