6
Grant Vortex Oil Boilers
6 Flue terminal - The flue terminal on the outside
wall must not be obstructed or damaged.
In severe conditions check that the terminal does
not become blocked by snow.
7 Frost protection - Your Installer may have fitted a
frost thermostat. If not, and you are likely to be
away for a short time, leave the boiler on with the
boiler thermostat set at a low setting. For longer
periods the boiler and system should be drained.
Contact your Service engineer for draining and
filling the system.
8 Cleaning and servicing - Lightly wipe over the
case with a damp cloth and a little detergent. Do
not use abrasive pads or cleaners.
You must have your boiler serviced at least once a
year to ensure safe and efficient operation. Contact
your Service engineer for further details.
9 Failure of electricity supply - If the electricity
supply fails, the boiler will not operate. It should
relight automatically when the supply is restored.
If a programmer is fitted it will retain the time
settings for up to 24 hours and will not have to be
reset to the correct time of day when the supply is
restored (the display remains for up to 1 hour, but
will re-appear when the supply is restored).
The boiler requires a 230/240 V ~ 50 Hz supply. It
must be protected by a 5 Amp fuse.
Warning: This appliance must be earthed.
If your boiler is operating on a sealed heating system,
the installer will have pressurised the system and
should have told you (or set it on the pressure gauge)
the system pressure when cold (this is normally
between 0.5 and 1.0 bar, which will increase slightly
when hot). If the pressure (when cold) is below the set
pressure mentioned above, you can re-pressurise the
system. If the system requires frequent re-pressurising,
ask your Installer or Service engineer to check the
heating system for leaks and to check the expansion
vessel air charge.
2 - USER INSTRUCTIONS
The boiler or system will be fitted with an automatic air
vent to remove air from the system. Any air trapped in the
radiators should be removed by venting the radiators
using the vent screw at the top of each radiator. Only vent
a radiator if the top is cool and the bottom is hot.
Excessive venting will reduce the system pressure, so
only vent when necessary and check the system pressure
as mentioned above. Re-pressurise the system if necessary.
The boiler or system may be fitted with a safety valve
to release excess pressure from the system. If water or
steam is emitted from the end of the safety valve
discharge pipe, switch off the boiler and contact your
Installer or Service engineer.
The expansion vessel air charge must be checked
annually. Failure to maintain an adequate air
charge in the vessel may invalidate the warranty.
To re-pressurise the system by adding water:
1 Only add water to the system when it is cold and
the boiler is off. Do not overfill.
2 Ensure the flexible filling loop (see Fig. B) is
connected and that the shut off valve connecting it
to the boiler is open and the double check 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 Gradually open the double check valve on the front
of the filling loop until water is heard to flow.
When the black needle of the pressure gauge is
between 0.5 and 1 bar, close the valve.
4 Vent each radiator in turn, starting with the lowest
one in the system, to remove air.
5 Continue to fill the system until the pressure gauge
indicates between 0.5 and 1.0 bar. Close the fill
point valve.
6 Repeat steps 4 and 5 as required.
7 Close the valves either side of the filling loop and
disconnect the loop.
Electricity supply
2.8
Sealed central heating system
2.9
Sealed system filling loop arrangement - Fig. B
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