Grant EFCON5090MOD, User Instructions

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Page 7
3.2 HOW TO FILL OR TOP UP YOUR
SEALED SYSTEM
(filling loop)
Figure 3-2: Sealed system fi lling loop arrangement
To fi ll or top up your heating system, proceed as follows:
1. Check the boiler and circulating pump are switched o ff and
any air vents on the system are open.
2. Connect the fi lling loop* between the two fi lling valves.
3. Open the fi lling valve on the mains water end of the fi lling
loop (the valve is open when the operating lever is in line with
the valve).
4. Open the fi lling valve on the heating end of the fi lling loop to
allow water to fl ow into the heating system (the valve is open
when the operating lever is in line with the valve).
5. When the pressure gauge shows the required cold system
pressure (refer to Section 3.1) close the fi lling valve on the
heating system.
6. Vent each radiator to remove any air that may be trapped
in them. Start with the lowest radiator in the system, i.e
downstairs.
7. Locate the circulating pump(s) and vent the pump(s) by
following the manufacturer’s instructions.
8. Now, check the system pressure on the system pressure
gauge. If necessary, re-open the fi lling valve on the system
until the gauge shows the required pressure. Take care not
to over- fi ll!
9. Finally, close both fi lling valves and disconnect the fi lling loop
at one end only. Take care, as the fi lling loop may contain
water!
*If you cannot locate the fi lling loop, please contact your installer.
! NOTE !
If the system has been drained down or requires frequent
topping up, then the level of inhibitor and/or anti-freeze will
need to be checked by your installer.
! WARNING !
Only add water to the system when the system is cold and
the boiler is switched o
ff .
Do not over fi ll
3.3 EXPANSION VESSEL
The expansion vessel should be checked annually, as part of your
annual service, to ensure that there is a 1.0 bar air charge in the
vessel. Failure to do this will invalidate the boiler guarantee. Refer
to Section 1.6 for further details regarding servicing.
! NOTE !
The pressure gauge on the system does not show the air
charge pressure in the expansion vessel.
! NOTE !
In order to properly care for your Grant boiler, an annual
service by a competent person should always be
undertaken.
3.4 VENTILATION
Your Grant Euro fl ame Condensing External boiler requires a fresh
supply of air in order for the burner to fi re. The boiler draws this air
through ventilation openings in the recessed top edge of the front
door of the boiler casing.
These ventilation openings must not be obstructed under any
circumstances.
You should periodically check that they are clear.
Do not attempt to ‘box in’ the boiler or build a compartment around
it before contacting your installer.
Do not place any combustible material around or on the boiler or
fl ue pipe.
3.5 FLUE TERMINAL AND CONDENSATE
DISPOSAL
FLUE TERMINAL
The fl ue terminal must not be damaged or obstructed in any way.
A wire mesh guard is required to cover the terminal if the terminal
is less than 2 metres above ground level. If you think one is
required, contact your installer.
You should periodically check for and remove any obstructions,
e.g. cut back any bushes that may have grown over the terminal.
Do not stack anything against or in front of the terminal.
In severe weather conditions, check that the terminal does not
become blocked by snow or ice.
‘PLUMING’ FROM THE FLUE TERMINAL
Whilst operating, it is quite normal for the boiler to produce a white
plume of condensation vapour from the fl ue terminal.
This is due to the high e ffi ciency of the boiler and may be
particularly evident with low outdoor temperatures.
CONDENSATE DISPOSAL
During the operation of the boiler, condensate is produced from
the fl ue gases and this is drained to a suitable disposal point
through the plastic waste pipe on the left hand side of the boiler.
The condensate drain must not be modi
fi ed or blocked.
Blockage of the condensate drain, caused by debris or freezing
can cause automatic shutdown of the boiler. If you suspect
freezing and the pipe run is accessible, you can try to free the
obstruction by pouring hot water over the exposed pipe and
clearing any blockage from the end of the pipe. If this fails to
remedy the problem, you should contact your service engineer.
Section 3: Caring for your Boiler